Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Selawik Hills, northwestern Alaska

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What does this data set describe?

Title:

Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Selawik Hills, northwestern Alaska

Abstract:

This report and digital data release presents 326 new geochemical analyses on historic U.S. Bureau of Mines (USBM) samples, including 106 rock, 164 stream sediment, and 56 heavy mineral concentrate (pan concentrate) samples. These samples were originally collected by the USBM as part of a mineral-reconnaissance project in the Selawik Hills area of northwestern Alaska. Historic USBM sample materials were retrieved by DGGS from the DGGS Geologic Materials Center (GMC), where the USBM samples were transferred as part of the federally funded Minerals Data and Information Rescue in Alaska (MDIRA) program in the late 1990s and early 2000s. The text and analytical data and tables associated with this report are being released in digital format as PDF files and .csv files. We provide analytical data, detection limits and, when available, the method documentation provided to us by the lab. We also provide the sample location in geographic coordinates, the sample material cited by the originating literature, a reference to the originating report, and the type of sample material that was obtained from the archive and sent to the lab.

Supplemental_Information:

The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships and correspond to subdirectories within the data distribution package. The metadata layer provides an FGDC metadata file and may include other documentation files. Attribute information for each data layer is described in this metadata file under the "Entity_and_Attribute_Information" section. Data layer contents:

border:    A polygon that encompasses the maximum geographic extent of the data observations
trace-element-ree:    Table with modern analyses of historic samples for geochemical trace-elements and rare-earth-elements and a table of analytical detection limits for each element

How should this data set be cited?
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Selawik Hills, northwestern Alaska: Raw Data File RDF 2014-10, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27295>
Other_Citation_Details: 4 p.
What geographic area does the data set cover?

West_Bounding_Coordinate: -160.676

East_Bounding_Coordinate: -159.394

North_Bounding_Coordinate: 66.362

South_Bounding_Coordinate: 65.9586
What does it look like?
Does the data set describe conditions during a particular time period?

Beginning_Date: 2013
Ending_Date: 2014
Currentness_Reference: ground condition
What is the general form of this data set?

Geospatial_Data_Presentation_Form: digital-data, report
How does the data set represent geographic features?
1. How are geographic features stored in the data set?
  This is a point data set.
2. What coordinate system is used to represent geographic features?
  Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in decimal degrees.
  The horizontal datum used is North American Datum of 1927.
  The ellipsoid used is Clarke 1866.
  The semi-major axis of the ellipsoid used is 6378206.4.
  The flattening of the ellipsoid used is 1/294.9786982.

How does the data set describe geographic features?

rdf2014-10-border.shp

A polygon that encompasses the maximum geographic extent of the data observations (Source: Alaska Division of Geological & Geophysical Surveys)

rdf2014-10-trace-element-ree.csv, rdf2014-10-trace-element-ree-limits.csv

Table with modern analyses of historic samples for geochemical trace-elements and rare-earth-elements and a table of analytical detection limits for each element. (Source: Alaska Division of Geological & Geophysical Surveys)

SAMPLE

Label assigned to identify the sample by USBM staff. (Source: Alaska Division of Geological & Geophysical Surveys)

Sample numbers were generated by USBM staff at the time of publication. Users should consult the originating report for additional information about the sample numbering protocols.

LONGITUDE

Longitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	-160.676
Maximum:	-159.394
Units:	decimal degrees

LATITUDE

Latitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	65.9586
Maximum:	66.362
Units:	decimal degrees

BATCH_NUMBER

Number provided by the laboratory to identify the samples and analyses included in the work order. (Source: ALS Minerals)

The batch numbers assigned by the lab for these results are: FA12138643, FA12138644, FA12138645, FA12138953, and FA12288393

LAB_SAMPLE_NUMBER

Label used by the lab to identify the sample. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals)

Value	Definition
NULL	The lab sample number is identical to the sample number.

The lab sample number is typically identical to the sample number. However, in some cases, the sample number used by the lab does differ from the published sample number. We provide both numbers to document instances in which the sample numbers listed on the Certificate of Assay or other laboratory results files were non-standard or found to be incorrect.

SAMPLE_MATERIAL

Sample media of the original USBM sample. These values where obtained from the originating report. In some cases the originating sample type was not explicitly noted but could be reasonably interpreted from the broader context of the report. (Source: United States Bureau of Mines staff)

Value	Definition
rock	The sample was collected from rock chips obtained from outcrops or isolated rocks (float) believed to represent underlying bedrock.
stream sediment	The sample was acquired from a streambed accumulation of sand, gravel, or other alluvial material.
pan concentrate	The sample was acquired from a streambed accumulation of sand, gravel, or other alluvial material that was subsequently concentrated by screening followed by hand panning the undersize portion.

WEIGHT_KG

Sample weight (as received by the lab) in kilograms (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals)

Value	Definition
NULL	received sample weight was less than 0.02 kilograms

Range of values
Minimum:	0.003
Maximum:	0.09
Units:	kilograms

REMARKS

Additional comments regarding the analysis or sample processing (Source: Alaska Division of Geological & Geophysical Surveys)

Characters 1 to 254 of a brief description.

REFERENCE

Reference to the originating USBM report (Source: Alaska Division of Geological & Geophysical Surveys)

Value	Definition
Barker, J.C., 1985	Barker, J.C., 1985, Sampling and analytical results of a Mineral reconnaissance in the Selawik Hills area, northwestern Alaska: U.S. Bureau of Mines Open-File Report 43-85, 67 p.

Ag_ppm_1

Silver values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.5 ppm; Upper detection limit = 100 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.5
Maximum:	2.1
Units:	parts per million

Ag_ppm_2

Silver values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 ppm; Upper detection limit = 100 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.01
Maximum:	3.14
Units:	parts per million

Al_pct_1

Aluminum values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.79
Maximum:	11.5
Units:	percent

Al_pct_2

Aluminum values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	2.37
Maximum:	9.42
Units:	percent

As_ppm_1

Arsenic values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	5
Maximum:	94
Units:	parts per million

As_ppm_2

Arsenic values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.2
Maximum:	49.4
Units:	parts per million

Au_ppm

Gold values measured in parts per million (ppm); Method: Fire Assay - Inductively Coupled Plasma - Atomic Emission Spectroscopy (FA-ICP-AES); Lower detection limit = 0.001 ppm; Upper detection limit = 10 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.001
Maximum:	5.16
Units:	parts per million

Ba_ppm_1

Barium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	20
Maximum:	8290
Units:	parts per million

Ba_ppm_2

Barium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-2	Above detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	50
Maximum:	5990
Units:	parts per million

Ba_ppm_3

Barium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-2	Above detection limit.

Range of values
Minimum:	18.4
Maximum:	9890
Units:	parts per million

Be_ppm_1

Beryllium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.5 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.5
Maximum:	31.2
Units:	parts per million

Be_ppm_2

Beryllium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.54
Maximum:	13.25
Units:	parts per million

Bi_ppm_1

Bismuth values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	2
Maximum:	7
Units:	parts per million

Bi_ppm_2

Bismuth values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.01
Maximum:	88.9
Units:	parts per million

Ca_pct_1

Calcium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.05
Maximum:	13.8
Units:	percent

Ca_pct_2

Calcium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.03
Maximum:	14.75
Units:	percent

Cd_ppm_1

Cadmium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.5 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.5
Maximum:	1
Units:	parts per million

Cd_ppm_2

Cadmium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.02 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.02
Maximum:	2.26
Units:	parts per million

Ce_ppm_1

Cerium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-2	Above detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	7.35
Maximum:	500
Units:	parts per million

Ce_ppm_2

Cerium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	5
Maximum:	1750
Units:	parts per million

Co_ppm_1

Cobalt values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1
Maximum:	124
Units:	parts per million

Co_ppm_2

Cobalt values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.9
Maximum:	57.7
Units:	parts per million

Cr_ppm_1

Chromium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	2
Maximum:	305
Units:	parts per million

Cr_ppm_2

Chromium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	2
Maximum:	988
Units:	parts per million

Cr_ppm_3

Chromium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	10
Maximum:	1500
Units:	parts per million

Cs_ppm_1

Cesium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.28
Maximum:	372
Units:	parts per million

Cs_ppm_2

Cesium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.01 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.14
Maximum:	399
Units:	parts per million

Cu_ppm_1

Copper values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	2
Maximum:	3870
Units:	parts per million

Cu_ppm_2

Copper values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1.3
Maximum:	201
Units:	parts per million

Dy_ppm

Dysprosium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.05 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.2
Maximum:	94.2
Units:	parts per million

Er_ppm

Erbium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.03 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.1
Maximum:	49.5
Units:	parts per million

Eu_ppm

Europium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.03 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.06
Maximum:	22
Units:	parts per million

Fe_pct_1

Iron values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.55
Maximum:	11.1
Units:	percent

Fe_pct_2

Iron values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.37
Maximum:	33.5
Units:	percent

Ga_ppm_1

Gallium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	10
Maximum:	40
Units:	parts per million

Ga_ppm_2

Gallium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	8.34
Maximum:	46.4
Units:	parts per million

Ga_ppm_3

Gallium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.1 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	2.4
Maximum:	47.5
Units:	parts per million

Gd_ppm

Gadolinium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.05 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.24
Maximum:	124
Units:	parts per million

Ge_ppm

Germanium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.05
Maximum:	2.73
Units:	parts per million

Hf_ppm_1

Hafnium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.1
Maximum:	40.4
Units:	parts per million

Hf_ppm_2

Hafnium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.5
Maximum:	354
Units:	parts per million

Ho_ppm

Holmium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.01 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.04
Maximum:	18
Units:	parts per million

In_ppm

Indium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.005 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.005
Maximum:	0.166
Units:	parts per million

K_pct_1

Potassium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.06
Maximum:	5.31
Units:	percent

K_pct_2

Potassium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.1
Maximum:	6.69
Units:	percent

La_ppm_1

Lanthanum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	10
Maximum:	490
Units:	parts per million

La_ppm_2

Lanthanum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	3.2
Maximum:	710
Units:	parts per million

La_ppm_3

Lanthanum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	2.1
Maximum:	868
Units:	parts per million

Li_ppm

Lithium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	5.1
Maximum:	500
Units:	parts per million

Lu_ppm

Lutetium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.01 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.02
Maximum:	6.18
Units:	parts per million

Mg_pct_1

Magnesium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.03
Maximum:	6.03
Units:	percent

Mg_pct_2

Magnesium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 50 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.03
Maximum:	7.98
Units:	percent

Mn_ppm_1

Manganese values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 5 ppm; Upper detection limit = 100000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	41
Maximum:	4160
Units:	parts per million

Mn_ppm_2

Manganese values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 5 ppm; Upper detection limit = 100000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	60
Maximum:	5380
Units:	parts per million

Mo_ppm_1

Molybdenum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1
Maximum:	18
Units:	parts per million

Mo_ppm_2

Molybdenum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.14
Maximum:	24.4
Units:	parts per million

Na_pct_1

Sodium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.03
Maximum:	4.61
Units:	percent

Na_pct_2

Sodium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.03
Maximum:	5.08
Units:	percent

Nb_ppm_1

Niobium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.9
Maximum:	470
Units:	parts per million

Nb_ppm_2

Niobium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.5
Maximum:	534
Units:	parts per million

Nd_ppm

Neodymium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	1.8
Maximum:	934
Units:	parts per million

Ni_ppm_1

Nickel values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1
Maximum:	1170
Units:	parts per million

Ni_ppm_2

Nickel values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1.1
Maximum:	191
Units:	parts per million

P_ppm_1

Phosphorus values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	30
Maximum:	6910
Units:	parts per million

P_ppm_2

Phosphorus values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	60
Maximum:	6230
Units:	parts per million

Pb_ppm_1

Lead values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	3
Maximum:	258
Units:	parts per million

Pb_ppm_2

Lead values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	4.5
Maximum:	316
Units:	parts per million

Pd_ppm

Palladium values measured in parts per million (ppm); Method: Fire Assay - Inductively Coupled Plasma - Atomic Emission Spectroscopy (FA-ICP-AES); Lower detection limit = 0.001 ppm; Upper detection limit = 10 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.001
Maximum:	0.015
Units:	parts per million

Pr_ppm

Praseodymium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.03 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.53
Maximum:	242
Units:	parts per million

Pt_ppm

Platinum values measured in parts per million (ppm); Method: Fire Assay - Inductively Coupled Plasma - Atomic Emission Spectroscopy (FA-ICP-AES); Lower detection limit = 0.005 ppm; Upper detection limit = 10 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.005
Maximum:	1.195
Units:	parts per million

Rb_ppm_1

Rubidium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	11.8
Maximum:	370
Units:	parts per million

Rb_ppm_2

Rubidium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	2.1
Maximum:	1470
Units:	parts per million

Re_ppm

Rhenium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.002 ppm; Upper detection limit = 50 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.002
Maximum:	0.009
Units:	parts per million

S_pct_1

Sulfur values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.01
Maximum:	1.82
Units:	percent

S_pct_2

Sulfur values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.01
Maximum:	0.62
Units:	percent

Sb_ppm_1

Antimony values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	5
Maximum:	88
Units:	parts per million

Sb_ppm_2

Antimony values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.11
Maximum:	27.6
Units:	parts per million

Sc_ppm_1

Scandium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1
Maximum:	50
Units:	parts per million

Sc_ppm_2

Scandium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.1
Maximum:	44.1
Units:	parts per million

Se_ppm

Selenium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	1
Maximum:	19
Units:	parts per million

Sm_ppm

Samarium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.03 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.32
Maximum:	168.5
Units:	parts per million

Sn_ppm_1

Tin values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.3
Maximum:	64.1
Units:	parts per million

Sn_ppm_2

Tin values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	1
Maximum:	113
Units:	parts per million

Sr_ppm_1

Strontium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	52
Maximum:	3180
Units:	parts per million

Sr_ppm_2

Strontium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	36.8
Maximum:	3200
Units:	parts per million

Sr_ppm_3

Strontium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	35.8
Maximum:	3430
Units:	parts per million

Ta_ppm_1

Tantalum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 100 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.06
Maximum:	40.3
Units:	parts per million

Ta_ppm_2

Tantalum values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.1
Maximum:	39.4
Units:	parts per million

Tb_ppm

Terbium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.01 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.03
Maximum:	18.6
Units:	parts per million

Te_ppm

Tellurium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.05 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.05
Maximum:	0.31
Units:	parts per million

Th_ppm_1

Thorium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 20 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	20
Maximum:	450
Units:	parts per million

Th_ppm_2

Thorium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.4
Maximum:	2270
Units:	parts per million

Th_ppm_3

Thorium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.05 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-2	Above detection limit.

Range of values
Minimum:	0.34
Maximum:	861
Units:	parts per million

Ti_pct_1

Titanium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 0.01 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.02
Maximum:	3.37
Units:	percent

Ti_pct_2

Titanium values measured in percent (pct); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.005 pct; Upper detection limit = 10 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.021
Maximum:	4.89
Units:	percent

Tl_ppm_1

Thallium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	10
Maximum:	10
Units:	parts per million

Tl_ppm_2

Thallium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.02 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.05
Maximum:	3.92
Units:	parts per million

Tl_ppm_3

Thallium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.5 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.5
Maximum:	5.9
Units:	parts per million

Tm_ppm

Thulium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.01 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.02
Maximum:	7.19
Units:	parts per million

U_ppm_1

Uranium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	10
Maximum:	190
Units:	parts per million

U_ppm_2

Uranium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.3
Maximum:	460
Units:	parts per million

U_ppm_3

Uranium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.05 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.13
Maximum:	499
Units:	parts per million

V_ppm_1

Vanadium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	3
Maximum:	499
Units:	parts per million

V_ppm_2

Vanadium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	5
Maximum:	952
Units:	parts per million

V_ppm_3

Vanadium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	5
Maximum:	1160
Units:	parts per million

W_ppm_1

Tungsten values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3 -HClO4 Acid Digestion, HCl Leach ; Lower detection limit = 10 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	10
Maximum:	350
Units:	parts per million

W_ppm_2

Tungsten values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	0.2
Maximum:	173
Units:	parts per million

W_ppm_3

Tungsten values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 1 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	1
Maximum:	542
Units:	parts per million

Y_ppm_1

Yttrium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.1 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	3.6
Maximum:	430
Units:	parts per million

Y_ppm_2

Yttrium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.5 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	1.2
Maximum:	495
Units:	parts per million

Yb_ppm

Ytterbium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 0.03 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Range of values
Minimum:	0.11
Maximum:	41
Units:	parts per million

Zn_ppm_1

Zinc values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	8
Maximum:	262
Units:	parts per million

Zn_ppm_2

Zinc values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	5
Maximum:	551
Units:	parts per million

Zr_ppm_1

Zirconium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy - Mass Spectrometry (ICP-AES-MS), HF-HNO3 -HClO4 Acid Digestion, HCl Leach; Lower detection limit = 0.5 ppm; Upper detection limit = 500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-2	Above detection limit.
NULL	Blank (NULL) field values indicate that this chemical species was not requested or not analyzed.

Range of values
Minimum:	2.3
Maximum:	491
Units:	parts per million

Zr_ppm_2

Zirconium values measured in parts per million (ppm); Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Metaborate Fusion; Lower detection limit = 2 ppm; Upper detection limit = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Minerals)

Value	Definition
-2	Above detection limit.

Range of values
Minimum:	18
Maximum:	9350
Units:	parts per million

Who produced the data set?

Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
- Werdon, M.B.
- Blessington, M.J.
Who also contributed to the data set?

This work was a component of the State of Alaska's Strategic and Critical Minerals Assessment project, a state-funded Capital Improvement Project, is designed to evaluate Alaska's statewide potential for SCM resources. Historic USBM sample materials were retrieved by DGGS from the DGGS Geologic Materials Center, where the USBM samples were transferred as part of the federally funded Minerals Data and Information Rescue in Alaska (MDIRA) program in the late 1990s and early 2000s.
To whom should users address questions about the data?

Alaska Division of Geological & Geophysical Surveys
GIS Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
dggsgis@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

The State of Alaska's Strategic and Critical Minerals (SCM) Assessment project, a state-funded Capital Improvement Project (CIP), designed to evaluate Alaska's statewide potential for SCM resources. The SCM Assessment project is being implemented by the Alaska Division of Geological & Geophysical Surveys (DGGS), and involves obtaining new airborne-geophysical, geological, and geochemical data. For the geochemical part of the SCM Assessment project, thousands of historic geochemical samples from the DGGS, U.S. Geological Survey, and U.S. Bureau of Mines (USBM) archives are being re-analyzed by DGGS using modern, quantitative, geochemical-analytical methods. The objective is to update the State of Alaska's statewide digital geochemical database in order to more clearly identify areas with SCM potential.

How was the data set created?

From what previous works were the data drawn?
Barker, J.C., 1985 (source 1 of 1)
Barker, J.C., 1985, Sampling and analytical results of a Mineral reconnaissance in the Selawik Hills area, northwestern Alaska: Open-File Report OFR 43-85, U.S. Bureau of Mines, United States.
Online Links:
- <http://www.dggs.alaska.gov/pubs/id/21409>
Other_Citation_Details: 67 p

Type_of_Source_Media: paper

Source_Contribution: sample selection and location coordinate identification
How were the data generated, processed, and modified?
Date: 2013 (process 1 of 6)
Sample selection and location coordinate identification - This report and digital data release presents 326 new geochemical analyses on historic U.S. Bureau of Mines (USBM) samples, including 106 rock, 164 stream sediment, and 56 heavy mineral concentrate (pan concentrate) samples. These samples were originally collected by the USBM as part of a mineral-reconnaissance project in the Selawik Hills area of northwestern Alaska. These historic USBM sample materials were retrieved by DGGS from the DGGS Geologic Materials Center (GMC), where the USBM samples were transferred as part of the federally funded Minerals Data and Information Rescue in Alaska (MDIRA) program in the late 1990s and early 2000s. Location data for each sample were derived by DGGS staff by scanning station-location map figures from USBM reports, georegistering the map figures in ArcGIS v. 10.1, creating a point layer of station locations, and extracting latitude-longitude coordinates. Location data for each sample are presented in latitude and longitude coordinates in decimal degrees with NAD27 datum and Clarke 1866 spheroid.
Data sources used in this process:
- Barker, J.C., 1985
Date: 2013 (process 2 of 6)
Sample preparation - Sample pulps were retrieved from the GMC, examined, and split by DGGS staff into aliquots needed for the analyses, with leftover portions of the pulps saved and stored at the GMC. Splits of pulps were submitted to ALS Minerals Laboratories (ALS) for analysis. Where pulps were unavailable, coarse-reject material was prepped by ALS using method PUL-31: pulverize split to 85 percent less than 75 microns. Coarse-reject samples were pulverized at ALS using "flying disk" or "ring and puck" style, low chrome, steel grinding mills. A sample split or total sample up to 250 g is pulverized, with 85 percent of the resulting material passing through a screen of 75 microns.

Date: 2013 (process 3 of 6)
Method ME-MS81 38-element, fusion, ICP-MS - For all samples, trace elements, including rare-earth elements, were determined using lithium metaborate fusion digestion and ICP-MS (ALS Minerals method ME-MS81). A prepared sample (0.200 g) is added to lithium metaborate flux (0.90 g), mixed well and fused in a furnace at 1,000Ã‚Â°C. The resulting melt is then cooled and dissolved in 100 mL of 4% HNO3 / 2% HCl3 solution. This solution is then analyzed by inductively coupled plasma-mass spectrometry (ICP-MS). Note: Some base-metal oxides and sulfides may not be completely decomposed by the lithium borate fusion. Results for Ag, Co, Cu, Mo, Ni, Pb, and Zn will not likely be quantitative by this method.

Date: 2013 (process 4 of 6)
Method ME-ICP61 33-element, 4-acid, ICP-AES - A prepared sample (0.25 g) is digested with perchloric, nitric, hydrofluoric, and hydrochloric acids. The residue is topped up with dilute hydrochloric acid and the resulting solution is analyzed by inductively coupled plasma-atomic emission spectrometry (ICP-AES). Results are corrected for spectral inter-element interferences. Note: Four-acid digestions are able to dissolve most minerals, however, although the term "near total" is used, depending on the sample matrix, not all elements may be quantitatively extracted.

Date: 2013 (process 5 of 6)
Method ME-MS61 48-element, 4-acid, ICP-AES or ICP-MS - A prepared sample (0.25 g) is digested with perchloric, nitric, hydrofluoric, and hydrochloric acids. The residue is topped up with dilute hydrochloric acid and the resulting solution is analyzed by inductively coupled plasma-atomic emission spectrometry (ICP-AES). Results are corrected for spectral inter-element interferences. Note: Four-acid digestions are able to dissolve most minerals, however, although the term "near total" is used, depending on the sample matrix, not all elements may be quantitatively extracted.

Date: 2013 (process 6 of 6)
Method PGM-ICP23 Pt, Pd, Au, 30-gram, FA-ICP-AES - Gold (Au), platinum (Pt), and palladium (Pd) values were obtained from a prepared, 30 g sample, fused with a mixture of lead oxide, sodium carbonate, borax, and silica, inquarted with 6 mg of gold-free silver, and then cupelled to yield a precious-metal bead. The bead is digested for 2 minutes at high power by microwave in dilute nitric acid. The solution is cooled and hydrochloric acid is added. The solution is digested for an additional 2 minutes at half power by microwave. The digested solution is then cooled, diluted to 4 mL with 2% hydrochloric acid, homogenized, and then analyzed for gold, platinum, and palladium by inductively coupled plasma-atomic emission spectrometry (ICP-AES).
What similar or related data should the user be aware of?
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Circle mining district, western Crazy Mountains, and the Lime Peak area of the White Mountains, Circle Quadrangle, east-central Alaska: Raw Data File RDF 2014-7, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27292>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from tin occurrences associated with the Ohio Creek pluton, south-central Alaska: Raw Data File RDF 2014-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27293>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Darby Mountains, Seward Peninsula, Alaska: Raw Data File RDF 2014-9, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27294>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Zane Hills pluton, northwestern Alaska: Raw Data File RDF 2014-11, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27296>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Ray River watershed, and Kanuti and Hodzana rivers uplands, central Alaska: Raw Data File RDF 2014-12, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27297>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the Porcupine River drainage, northeastern Alaska: Raw Data File RDF 2014-13, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27298>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from the VABM Bend area, Charley River and Eagle quadrangles, east-central Alaska: Raw Data File RDF 2014-14, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27299>
Other_Citation_Details: 4 p
Werdon, M.B., and Blessington, M.J., 2014, Analyses of historic U.S. Bureau of Mines samples for geochemical trace-element and rare-earth-element data from Kook Lake, Sitka Quadrangle, Alaska: Raw Data File RDF 2014-15, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://dx.doi.org/10.14509/27300>
Other_Citation_Details: 4 p

How reliable are the data; what problems remain in the data set?

How well have the observations been checked?
Analytical results obtained from samples submitted to geochemical laboratories must pass through two levels of data validation. The first level of quality control checks occurs at ALS, which is accredited to ISO/IEC 17025-2005 standards. The laboratory's quality control protocol is to insert a reagent blank and a reference sample material with every batch of 20 samples to measure the analytical accuracy. Duplicate samples are analyzed at the end of the sample set to measure analytical variance as well as sample variance. Data passing the quality control criteria are sent to DGGS. The second level of data validation is performed by DGGS. All samples submitted to ALS are accompanied by a variety of DGGS in-house, ore-geochemical reference samples (blinds) submitted at the rate of 1, or occasionally more than 1, per sample batch. Upon receipt of analyses from the lab, reference standards are checked by DGGS against their accepted values. If present, any batches with reference standards with elemental values falling outside 2 standard deviations of their accepted values were submitted to the lab to be reanalyzed. For each sample, data tables either contain assay values, or they contain coded-value place holders (that is, null = not analyzed; -1 = the element's assay result is less than the lower detection limit for the method; -2 = the element's assay result is greater than the upper detection limit for the method). We provide detection limits and, when available, the method documentation provided to us by the lab. Users should contact the originating lab for additional information about detection limits and reporting procedures. We obtained geographic coordinates and the original sample material from the originating literature. We also note the type of sample material that was obtained from the archive and sent to the lab. The reported sample weights were measured by DGGS staff and are considered to be more accurate than the weight values listed on the ALS Certificate of Assay. Samples were sent to ALS in multiple batches and the method used varies between batches. In some cases, the method used may not provide quantitative results for all elements. The analyses presented in this publication were generated as a component of a broader project in which five batches of samples were sent to ALS. In a few cases samples were reanalyzed using several different methods, consequently, each analysis is uniquely identified by the combination of sample number + laboratory batch number.
How accurate are the geographic locations?
Location data for each sample were derived by DGGS staff by scanning station-location map figures from USBM reports, georegistering the map figures in ArcGIS v. 10.1, creating a point layer of station locations, and extracting latitude-longitude coordinates. Although ArcGIS can provide precise location coordinates, users should consider both possible errors intrinsic to how the historic locations were originally collected as well as error inherent in scanning and digitizing locations from a printed map. Location data for each sample are presented in latitude and longitude coordinates in decimal degrees with NAD27 datum and Clarke 1866 spheroid.
How accurate are the heights or depths?
Where are the gaps in the data? What is missing?
This dataset is complete.
How consistent are the relationships among the observations, including topology?
not applicable

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).

Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

Who distributes the data set? (Distributor 1 of 1)

Alaska Division of Geological & Geophysical Surveys
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Contact_Instructions:
Please view our website (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
What's the catalog number I need to order this data set?
RDF 2014-10
What legal disclaimers am I supposed to read?

The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
How can I download or order the data?
- Availability in non-digital form:
  DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.
- Cost to order the data: Contact DGGS for current pricing
- Availability in digital form:
  
  Data format: ASCII tabular files
  
  Network links: <http://dx.doi.org/10.14509/27295>
- Cost to order the data: Free download

Who wrote the metadata?

Dates:

Last modified: 22-Aug-2014

Metadata author:

Alaska Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)

Metadata standard:

FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

<http://www.dggs.alaska.gov/metadata/dggs.ext>

Generated by mp version 2.9.21 on Fri Aug 22 10:43:39 2014

Data format:	ASCII tabular files
Network links:	<http://dx.doi.org/10.14509/27295>