Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska

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What does this data set describe?

Title:

Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska

Abstract:

During the 2017 field season, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) conducted geologic mapping and sampling of part of the Richardson Mining District southeast of Fairbanks, including parts of the Big Delta B-4, B-5, and C-5 quadrangles. The project area is about 30 miles west of the Pogo gold mine and covers the currently active Montecristo and Uncle Sam gold-exploration properties. The goal of DGGS's work in this area is to conduct a mineral-resource assessment and to build an improved understanding of the area's geology and controls on gold mineralization to facilitate industry exploration targeting. This report is based on 17 days of fieldwork completed June 23-July 3, July 18-20, and August 11-13, 2017 by two to seven DGGS geologists. The study area is bound by the Pogo Road to the southeast and the Trans-Alaska Pipeline access road to the southwest (fig. 1); the crew accessed the interior of the study area by helicopter, all-terrain vehicles, and foot. The Richardson area is characterized by moderate-relief hills and boreal spruce and deciduous forest typical of interior Alaska. Loess deposits of variable thickness blanket the area, and deposits of forest-covered eolian sand, including well-formed dune fields, cover the southeastern quadrant of the area along Shaw Creek. Rock outcrop accounts for much less than one percent of the study area, consequently, the majority of rock samples were collected from pits, up to 1-meter-deep, dug with shovels into rocky colluvial deposits below the surficial loess or sand. Highlights of geochemical results include 2.67 parts per million (ppm) gold and 68.4 ppm silver from a float sample collected at the Naosi prospect. An in-place, surface rock sample collected from the Mon prospect area assayed 2.42 ppm gold and 23 ppm silver. Both prospects are part of the Montecristo property. Whole-rock analyses indicate the granitic dikes that are abundant on the Montecristo and Uncle Sam properties are peraluminous granites of arc character. They most closely resemble the Early Cretaceous peraluminous felsic dikes documented in the southeastern Richardson district by Graham (2002); they are less similar (less peraluminous) to the ca. 90 Ma Gold Run intrusion (Graham, 2002) and Birch Lake pluton (Burns and others, 1993). Amphibolite samples are basaltic in composition and have island-arc tholeiite or mid-ocean ridge basalt character, similar to unit MzPza amphibolites in the Salcha River-Pogo area (Werdon and others, 2004). The analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files. Additional details about the organization of information are noted in the accompanying metadata file. All files can be downloaded from the DGGS website (<http://doi.org/10.14509/29779>).

Supplemental_Information:

border: Outline of the study area 
major-oxide-trace-element: Major- and minor-oxide and trace-element analysis of geological samples and summary of analytical methods; includes magnetic susceptibility measurements. 
trace-element: Trace-element analysis of geological samples and summary of analytical methods; includes magnetic susceptibility measurements.

How should this data set be cited?
Twelker, Evan, Wypych, Alicja, Sicard, K.R., Naibert, T.J., Werdon, M.B., Athey, J.E., Willingham, A.L., and Lockett, A.C., 2017, Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska: Raw Data File RDF 2017-11, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/29779>
Other_Citation_Details: 4 p.
What geographic area does the data set cover?

West_Bounding_Coordinate: -146.310962

East_Bounding_Coordinate: -145.703505

North_Bounding_Coordinate: 64.524059

South_Bounding_Coordinate: 64.304267
What does it look like?
Does the data set describe conditions during a particular time period?

Calendar_Date: 2017
Currentness_Reference: ground condition
What is the general form of this data set?

Geospatial_Data_Presentation_Form: report and digital data
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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in decimal degrees.
  The horizontal datum used is World Geodetic System of 1984.
  The ellipsoid used is WGS 84.
  The semi-major axis of the ellipsoid used is 6378137.
  The flattening of the ellipsoid used is 1/298.257223563000025.

How does the data set describe geographic features?

rdf2017-11-border.shp

Outline of the study area (Source: Alaska Division of Geological & Geophysical Surveys)

rdf2017-11-major-oxide-trace-element.csv, rdf2017-11-major-oxide-trace-element-limits.csv

Major- and minor-oxide and trace-element analysis of geological samples and summary of analytical methods; includes magnetic susceptibility measurements.. (Source: Alaska Division of Geological & Geophysical Surveys)

SAMPLE

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

Generic example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.

LAB_SAMPLE_NUMBER

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

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.

BATCH_NUMBER

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

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

The batch numbers assigned by the lab for these results are: FA17133296, and FA17176333

LONGITUDE

Longitude, WGS84 (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	-146.2267462
Maximum:	-145.7035055
Units:	decimal degrees

LATITUDE

Latitude, WGS84 (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	64.30426732
Maximum:	64.51166832
Units:	decimal degrees

COLLECTOR

The geologist who collected the sample. (Source: Alaska Division of Geological & Geophysical Surveys)

The samples presented in this report were collected by: Alicja Wypych, Amanda L. Willingham, Evan Twelker, Karri R. Sicard, and Melanie B. Werdon

SAMPLE_DESCRIPTION

Description of the sample (Source: Alaska Division of Geological & Geophysical Surveys)

Characters 1 to 254 of a brief sample or station description.

SAMPLE_DESCRIPTION_2

Extension of the sample or station description for descriptions which are greater than 254 characters in length (Source: Alaska Division of Geological & Geophysical Surveys)

Value	Definition
NULL	The descriptive text is shorter than 254 characters.

Characters greater than 254 of the sample or station description.

MAG_AVG

average magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	0.009
Maximum:	0.461
Units:	10^-3 SI

WEIGHT_KG

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

Value	Definition
NULL	received sample weight was not provided by the lab

Range of values
Minimum:	0.4
Maximum:	0.86
Units:	kilograms

Au_ppm_Au-ICP21

Gold values measured in parts per million; 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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

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

Au_ppm_PGM-MS23

Gold values measured in parts per million; Method: Fire Assay - Inductively Coupled Plasma - Mass Spectrometry (FA-ICP-MS); Lower detection limit = 0.001 ppm; Upper detection limit = 1 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.004
Maximum:	0.004
Units:	parts per million

Pt_ppm_PGM-MS23

Platinum values measured in parts per million; Method: Fire Assay - Inductively Coupled Plasma - Mass Spectrometry (FA-ICP-MS); Lower detection limit = 0.0005 ppm; Upper detection limit = 1 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Pd_ppm_PGM-MS23

Palladium values measured in parts per million; Method: Fire Assay - Inductively Coupled Plasma - Mass Spectrometry (FA-ICP-MS); Lower detection limit = 0.001 ppm; Upper detection limit = 1 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

SiO2_pct_ME-ICP06

Silicon dioxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	48.3
Maximum:	78.5
Units:	percent

Al2O3_pct_ME-ICP06

Aluminum oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	11
Maximum:	16.15
Units:	percent

Fe2O3_pct_ME-ICP06

Iron oxide (+3) values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.75
Maximum:	11.4
Units:	percent

CaO_pct_ME-ICP06

Calcium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.1
Maximum:	11.05
Units:	percent

MgO_pct_ME-ICP06

Magnesium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.06
Maximum:	7.82
Units:	percent

Na2O_pct_ME-ICP06

Sodium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.18
Maximum:	3.57
Units:	percent

K2O_pct_ME-ICP06

Potassium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.12
Maximum:	6.29
Units:	percent

Cr2O3_pct_ME-ICP06

Chromium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.01
Maximum:	0.04
Units:	percent

TiO2_pct_ME-ICP06

Titanium dioxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.03
Maximum:	1.91
Units:	percent

MnO_pct_ME-ICP06

Manganese oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.02
Maximum:	0.22
Units:	percent

P2O5_pct_ME-ICP06

Phosphorus oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.03
Maximum:	0.38
Units:	percent

SrO_pct_ME-ICP06

Strontium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.01
Maximum:	0.06
Units:	percent

BaO_pct_ME-ICP06

Barium oxide values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), Lithium Borate Fusion; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.01
Maximum:	0.18
Units:	percent

LOI_pct_OA-GRA05

Loss on Ignition values measured in percent; Method: Gravimetric (GRAV), Thermal decomposition furnace; Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.35
Maximum:	2.31
Units:	percent

Total_pct_TOT-ICP06

Total values measured in percent; Method: Calculation (Calculation); Lower detection limit = 0.01 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	98.21
Maximum:	101.87
Units:	percent

Ag_ppm_ME-4ACD81

Silver values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Value	Definition
-1	Below detection limit.

As_ppm_ME-MS42

Arsenic values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.1 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.3
Maximum:	31.2
Units:	parts per million

Ba_ppm_ME-MS81

Barium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	35
Maximum:	1605
Units:	parts per million

Bi_ppm_ME-MS42

Bismuth values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.01 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.01
Maximum:	4.33
Units:	parts per million

Cd_ppm_ME-4ACD81

Cadmium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Value	Definition
-1	Below detection limit.

Ce_ppm_ME-MS81

Cerium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	5
Maximum:	110
Units:	parts per million

Co_ppm_ME-4ACD81

Cobalt values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	1
Maximum:	42
Units:	parts per million

C_pct_C-IR07

Carbon values measured in percent; Method: Combustion Furnace (Combustion Furnace); 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 Geochemistry)

Range of values
Minimum:	0.02
Maximum:	0.22
Units:	percent

Cr_ppm_ME-MS81

Chromium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	10
Maximum:	280
Units:	parts per million

Cs_ppm_ME-MS81

Cesium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.43
Maximum:	8.95
Units:	parts per million

Cu_ppm_ME-4ACD81

Copper values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Range of values
Minimum:	1
Maximum:	151
Units:	parts per million

Dy_ppm_ME-MS81

Dysprosium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	1.04
Maximum:	6.17
Units:	parts per million

Er_ppm_ME-MS81

Erbium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.53
Maximum:	4.03
Units:	parts per million

Eu_ppm_ME-MS81

Europium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.07
Maximum:	1.98
Units:	parts per million

Ga_ppm_ME-MS81

Gallium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	14.9
Maximum:	22.7
Units:	parts per million

Gd_ppm_ME-MS81

Gadolinium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.69
Maximum:	6.68
Units:	parts per million

Ge_ppm_ME-MS81

Germanium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate Fusion; Lower detection limit = 5 ppm; Upper detection limit = 1000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Hf_ppm_ME-MS81

Hafnium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.8
Maximum:	6.1
Units:	parts per million

Hg_ppm_ME-MS42

Mercury values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.005 ppm; Upper detection limit = 25 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.005
Maximum:	0.015
Units:	parts per million

Ho_ppm_ME-MS81

Holmium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.19
Maximum:	1.22
Units:	parts per million

In_ppm_ME-MS42

Indium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.005 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.005
Maximum:	0.067
Units:	parts per million

La_ppm_ME-MS81

Lanthanum values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	2.5
Maximum:	53.8
Units:	parts per million

Li_ppm_ME-4ACD81

Lithium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Range of values
Minimum:	10
Maximum:	140
Units:	parts per million

Lu_ppm_ME-MS81

Lutetium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.15
Maximum:	0.72
Units:	parts per million

Mo_ppm_ME-4ACD81

Molybdenum values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Value	Definition
-1	Below detection limit.

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

Nb_ppm_ME-MS81

Niobium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate Fusion; Lower detection limit = 0.2 ppm; Upper detection limit = 2500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	1.6
Maximum:	45.5
Units:	parts per million

Nd_ppm_ME-MS81

Neodymium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	1.9
Maximum:	43.1
Units:	parts per million

Ni_ppm_ME-4ACD81

Nickel values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	1
Maximum:	80
Units:	parts per million

Pb_ppm_ME-4ACD81

Lead values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	5
Maximum:	47
Units:	parts per million

Pr_ppm_ME-MS81

Praseodymium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.62
Maximum:	11.8
Units:	parts per million

Rb_ppm_ME-MS81

Rubidium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	4.9
Maximum:	263
Units:	parts per million

Re_ppm_ME-MS42

Rhenium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.001 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Sb_ppm_ME-MS42

Antimony values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.05 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.05
Maximum:	18.15
Units:	parts per million

Sc_ppm_ME-4ACD81

Scandium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Range of values
Minimum:	2
Maximum:	39
Units:	parts per million

Se_ppm_ME-MS42

Selenium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.2 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.2
Maximum:	0.5
Units:	parts per million

Sm_ppm_ME-MS81

Samarium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.76
Maximum:	7.81
Units:	parts per million

Sn_ppm_ME-MS81

Tin values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	1
Maximum:	7
Units:	parts per million

S_pct_S-IR08

Sulfur values measured in percent; Method: Combustion Furnace (Combustion Furnace); 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 Geochemistry)

Value	Definition
-1	Below detection limit.

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

Sr_ppm_ME-MS81

Strontium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	22.5
Maximum:	519
Units:	parts per million

Ta_ppm_ME-MS81

Tantalum values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate Fusion; Lower detection limit = 0.1 ppm; Upper detection limit = 2500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Range of values
Minimum:	0.1
Maximum:	4.6
Units:	parts per million

Tb_ppm_ME-MS81

Terbium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.17
Maximum:	1
Units:	parts per million

Te_ppm_ME-MS42

Tellurium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.01 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.01
Maximum:	0.05
Units:	parts per million

Th_ppm_ME-MS81

Thorium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.32
Maximum:	28.7
Units:	parts per million

Tl_ppm_ME-MS42

Thallium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.02 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	0.03
Maximum:	0.68
Units:	parts per million

Tm_ppm_ME-MS81

Thulium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.13
Maximum:	0.73
Units:	parts per million

U_ppm_ME-MS81

Uranium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.13
Maximum:	7.97
Units:	parts per million

V_ppm_ME-MS81

Vanadium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	5
Maximum:	342
Units:	parts per million

W_ppm_ME-MS81

Tungsten values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Value	Definition
-1	Below detection limit.

Range of values
Minimum:	1
Maximum:	7
Units:	parts per million

Yb_ppm_ME-MS81

Ytterbium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	0.92
Maximum:	4.9
Units:	parts per million

Y_ppm_ME-MS81

Yttrium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	6.3
Maximum:	35.4
Units:	parts per million

Zn_ppm_ME-4ACD81

Zinc values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HF-HNO3-HClO4-HCl; 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 Geochemistry)

Range of values
Minimum:	7
Maximum:	99
Units:	parts per million

Zr_ppm_ME-MS81

Zirconium values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Lithium Borate 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 Geochemistry)

Range of values
Minimum:	17
Maximum:	231
Units:	parts per million

rdf2017-11-trace-element.csv, rdf2017-11-trace-element-limits.csv

Trace-element analysis of geological samples and summary of analytical methods; includes magnetic susceptibility measurements.. (Source: Alaska Division of Geological & Geophysical Surveys)

SAMPLE

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

LAB_SAMPLE_NUMBER

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

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

BATCH_NUMBER

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

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

The batch numbers assigned by the lab for these results are: FA17133283, FA17162563, and FA17176331

LONGITUDE

Longitude, WGS84 (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	-146.3109621
Maximum:	-145.7610129
Units:	decimal degrees

LATITUDE

Latitude, WGS84 (Source: Alaska Division of Geological & Geophysical Surveys)

Range of values
Minimum:	64.31611618
Maximum:	64.52405883
Units:	decimal degrees

COLLECTOR

The geologist who collected the sample. (Source: Alaska Division of Geological & Geophysical Surveys)

The samples presented in this report were collected by: Alicja Wypych, Amanda L. Willingham, Evan Twelker, Jennifer E. Athey, Karri R. Sicard, Melanie B. Werdon, and Travis J. Naibert

SAMPLE_DESCRIPTION

Description of the sample (Source: Alaska Division of Geological & Geophysical Surveys)

Characters 1 to 254 of a brief sample or station description.

SAMPLE_DESCRIPTION_2

Extension of the sample or station description for descriptions which are greater than 254 characters in length (Source: Alaska Division of Geological & Geophysical Surveys)

Value	Definition
NULL	The descriptive text is shorter than 254 characters.

Characters greater than 254 of the sample or station description.

MAG_AVG

average magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

Value	Definition
NULL	average magnetic susceptibility was not measured

Range of values
Minimum:	0.009
Maximum:	13.9
Units:	10^-3 SI

Au_ppm_Au-ICP21

Gold values measured in parts per million; Method: Fire Assay - Inductively Coupled Plasma - Atomic Emission Spectroscopy (FA-ICP-AES), flux; 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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.001
Maximum:	2.67
Units:	parts per million

Ag_ppm_ME-MS61

Silver values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.01
Maximum:	68.4
Units:	parts per million

Al_pct_ME-MS61

Aluminum values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.07
Maximum:	10
Units:	percent

As_pct_As-OG62

Arsenic values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl; Lower detection limit = 0.001 pct; Upper detection limit = 30 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.97
Maximum:	1.485
Units:	percent

As_ppm_ME-MS61

Arsenic values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-2	Above detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1.1
Maximum:	5490
Units:	parts per million

Ba_ppm_ME-MS61

Barium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	20
Maximum:	1730
Units:	parts per million

Be_ppm_ME-MS61

Beryllium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.15
Maximum:	21.3
Units:	parts per million

Bi_ppm_ME-MS61

Bismuth values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.03
Maximum:	147.5
Units:	parts per million

Ca_pct_ME-MS61

Calcium values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.01
Maximum:	14.7
Units:	percent

Cd_ppm_ME-MS61

Cadmium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.02
Maximum:	18.8
Units:	parts per million

Ce_ppm_ME-MS61

Cerium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.4
Maximum:	118
Units:	parts per million

Co_ppm_ME-MS61

Cobalt values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.3
Maximum:	77.4
Units:	parts per million

Cr_ppm_ME-MS61

Chromium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	4
Maximum:	1630
Units:	parts per million

Cs_ppm_ME-MS61

Cesium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.08
Maximum:	8.95
Units:	parts per million

Cu_ppm_ME-MS61

Copper values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1.5
Maximum:	427
Units:	parts per million

Fe_pct_ME-MS61

Iron values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.62
Maximum:	11.25
Units:	percent

Ga_ppm_ME-MS61

Gallium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.42
Maximum:	31.5
Units:	parts per million

Ge_ppm_ME-MS61

Germanium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.07
Maximum:	0.27
Units:	parts per million

Hf_ppm_ME-MS61

Hafnium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.1
Maximum:	5
Units:	parts per million

Hg_ppm_Hg-MS42

Mercury values measured in parts per million; Method: Inductively Coupled Plasma - Mass Spectroscopy (ICP-MS), Aqua regia; Lower detection limit = 0.005 ppm; Upper detection limit = 100 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.005
Maximum:	1.29
Units:	parts per million

In_ppm_ME-MS61

Indium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.005
Maximum:	10.6
Units:	parts per million

K_pct_ME-MS61

Potassium values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.02
Maximum:	4.82
Units:	percent

La_ppm_ME-MS61

Lanthanum values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.9
Maximum:	56.6
Units:	parts per million

Li_ppm_ME-MS61

Lithium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	2.9
Maximum:	84.6
Units:	parts per million

Mg_pct_ME-MS61

Magnesium values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.01
Maximum:	20.2
Units:	percent

Mn_ppm_ME-MS61

Manganese values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	52
Maximum:	3210
Units:	parts per million

Mo_ppm_ME-MS61

Molybdenum values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.14
Maximum:	29.1
Units:	parts per million

Na_pct_ME-MS61

Sodium values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.01
Maximum:	2.83
Units:	percent

Nb_ppm_ME-MS61

Niobium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.2
Maximum:	80.7
Units:	parts per million

Ni_ppm_ME-MS61

Nickel values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1.2
Maximum:	1095
Units:	parts per million

Pb_ppm_ME-MS61

Lead values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.9
Maximum:	6340
Units:	parts per million

P_ppm_ME-MS61

Phosphorus values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	10
Maximum:	4690
Units:	parts per million

Rb_ppm_ME-MS61

Rubidium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1
Maximum:	243
Units:	parts per million

Re_ppm_ME-MS61

Rhenium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.002
Maximum:	0.007
Units:	parts per million

Sb_ppm_ME-MS61

Antimony values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-2	Above detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.19
Maximum:	1930
Units:	parts per million

Sc_ppm_ME-MS61

Scandium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.1
Maximum:	19.9
Units:	parts per million

Se_ppm_ME-MS61

Selenium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1
Maximum:	7
Units:	parts per million

Sn_ppm_ME-MS61

Tin values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.2
Maximum:	70
Units:	parts per million

S_pct_ME-MS61

Sulfur values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

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

Sr_ppm_ME-MS61

Strontium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1.4
Maximum:	749
Units:	parts per million

Ta_ppm_ME-MS61

Tantalum values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.11
Maximum:	7.53
Units:	parts per million

Te_ppm_ME-MS61

Tellurium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.05
Maximum:	17.15
Units:	parts per million

Th_ppm_ME-MS61

Thorium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.13
Maximum:	33.2
Units:	parts per million

Ti_pct_ME-MS61

Titanium values measured in percent; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.006
Maximum:	0.509
Units:	percent

Tl_ppm_ME-MS61

Thallium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.02
Maximum:	2.22
Units:	parts per million

U_ppm_ME-MS61

Uranium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.1
Maximum:	12.5
Units:	parts per million

V_ppm_ME-MS61

Vanadium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	1
Maximum:	235
Units:	parts per million

W_ppm_ME-MS61

Tungsten values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.1
Maximum:	2190
Units:	parts per million

Y_ppm_ME-MS61

Yttrium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.2
Maximum:	76.4
Units:	parts per million

Zn_ppm_ME-MS61

Zinc values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
-1	Below detection limit.
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	2
Maximum:	998
Units:	parts per million

Zr_ppm_ME-MS61

Zirconium values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy/Inductively Coupled - Plasma Mass Spectrometry (ICP-AES/ICP-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 Geochemistry)

Value	Definition
NULL	Blank (NULL) field values may indicate that either the chemical species was not analyzed or that it was measured but found to be below detection limits.

Range of values
Minimum:	0.5
Maximum:	115
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)
- Twelker, Evan
- Wypych, Alicja
- Sicard, K.R.
- Naibert, T.J.
- Werdon, M.B.
- Athey, J.E.
- Willingham, A.L.
- Lockett, A.C.
Who also contributed to the data set?

The DGGS northeast Tanacross Quadrangle geologic mapping project was funded by the State of Alaska.
To whom should users address questions about the data?

Alaska Division of Geological & Geophysical Surveys
Metadata Manager
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

Why was the data set created?

The combination of a lack of detailed geologic mapping, historical and current industry interest in the area's mineral potential, and interpretation of airborne geophysical datasets prompted the DGGS Mineral Resources section to conduct geologic mapping and geochemical sampling in the Richardson Mining District.

How was the data set created?

From what previous works were the data drawn?
How were the data generated, processed, and modified?

Date: 2017 (process 1 of 5)
Sample selection - Rock samples were collected for two different purposes. First, samples of visibly mineralized or altered rock were preferentially collected and analyzed for trace-element geochemistry. Second, igneous and metaigneous rocks showing little alteration or weathering were collected for whole-rock major-oxide, minor-oxide, and trace-element analyses to aid in classification and study of petrogenesis and tectonic setting. Most samples are 'grab' samples, which were collected for their overall representation of the outcrop. However, a few samples are 'select' samples, which were more deliberately collected from a specific feature, as noted in the sample field description.

Date: 2017 (process 2 of 5)
Magnetic susceptibility measurements - Magnetic susceptibility measurements were collected using Terraplus KT 5-, 6-, 9-, and 10-model handheld magnetic susceptibility meters. The values reported herein are for average Systeme International (SI) measurements performed on representative surfaces of the sampled rock outcrop. Blank values in the magnetic susceptibility fields of this dataset indicate that the geologist who collected the sample was not equipped with a magnetic susceptibility meter.

Date: 2017 (process 3 of 5)
Sample preparation - Rock samples were processed by ALS Geochemistry using their PREP-31 package. The samples were crushed to greater than 70 percent passing through a 2 mm mesh, and a 250-g split was pulverized to greater than 85 percent of the material being less than 75 microns in diameter. Prior to crushing, samples for whole-rock analysis were trimmed by DGGS staff to remove weathering, and cut surfaces were sanded to remove any saw metal.

Date: 2017 (process 4 of 5)
Major- and trace-element compositions - Major- and trace-element values for rock samples were determined by ALS Geochemistry method ME-MS61: Four-acid digestion followed by inductively-coupled plasma-atomic emission spectrometry (ICP-AES) and inductively-coupled plasma-mass spectroscopy (ICP-MS); Au values were analyzed using flux digestion and fire assay and ICP-AES (ALS Geochemistry method Au-ICP21). Samples that exceeded detection limits for elements of interest were reanalyzed using specific elemental tests. Over-limit values for As were analyzed using four-acid digestion followed by inductively-coupled plasma-atomic emission spectrometry (ALS Geochemistry method ME-OG62).

Date: 2017 (process 5 of 5)
Whole-rock geochemistry - For whole-rock geochemistry samples, major and minor oxides were analyzed by lithium metaborate fusion digestion and ICP-AES (ALS Geochemistry method ME-ICP06). Trace elements, including rare-earth elements, were determined using lithium metaborate fusion digestion and ICP-MS (ALS Geochemistry method ME-MS81). Ag, Cd, Co, Cu, Li, Mo, Ni, Pb, Sc, and Zn were determined by four-acid digestion and ICP-AES (ALS Geochemistry method ME-4ACD81); and As, Bi, Hg, In, Re, Sb, Se, Te, and Tl were determined by aqua regia digestion followed by ICP-MS (ALS Geochemistry method ME-MS42). Total C and S were analyzed by Leco furnace (ALS Geochemistry methods C-IR07 and S-IR08, respectively). Pt, Pd, and Au were analyzed by lead oxide fire assay with ICP-MS finish (ALS Geochemistry method PGM-MS23). Where only Au values are reported, samples were analyzed using flux digestion and fire assay and ICP-AES (ALS Geochemistry method Au-ICP21).
What similar or related data should the user be aware of?
Burns, L.E., Solie, D.N., and Newberry, R.J., 1993, Digital files of geochemical analyses of plutonic rocks in east-central interior Alaska: Public Data File PDF 93-44, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/1603>
Other_Citation_Details: 58 p
Graham, G.E., 2002, Geology and gold mineralization of the Richardson district, east-central Alaska: University of Alaska Fairbanks, Fairbanks, Alaska.
Online Links:
- null
Werdon, M.B., Newberry, R.J., Athey, J.E., and Szumigala, D.J., 2004, Bedrock geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska: Report of Investigation RI 2004-1B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Online Links:
- <http://doi.org/10.14509/3209>
Other_Citation_Details: 19 p., 1 sheet, scale 1:63,360

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

How well have the observations been checked?
Coordinates of sample locations were determined by the geologists in the field using using hand-held GPS devices. Sample numbers were recorded in the field on sample bags and on field note sheets. The sample location tables were plotted in GIS software to visually verify location accuracy and cross checked for consistency against the sample numbers recorded on the bags. In addition to ALS Geochemistry's accredited (ISO/IEC 17025-2005) internal quality-control program, DGGS monitored analysis quality with one standard reference material per batch. Lab results were examined by the DGGS geologists to ensure that they are reasonable given the geologic context of the sample. Inconsistencies between the field data and the lab sample numbers listed on the COA (certificate of assay) are noted in the data tables.
How accurate are the geographic locations?
Location data were collected using Trimble Juno T41/5 WAAS-enabled GPS devices running ArcGIS for Windows Mobile. Data were merged into an ArcGIS geodatabase. WAAS-enabled GPS devices have a reported error of about 1 m. Latitude and longitude are reported in the WGS84 datum.
How accurate are the heights or depths?
Where are the gaps in the data? What is missing?
This data release 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
Metadata Manager
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
What's the catalog number I need to order this data set?
RDF 2017-11
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://doi.org/10.14509/29779>
- Cost to order the data: Free download

Who wrote the metadata?

Dates:

Last modified: 08-Nov-2017

Metadata author:

Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
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

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 Wed Nov 8 17:01:25 2017

Data format:	ASCII tabular files
Network links:	<http://doi.org/10.14509/29779>