Major-oxide, minor-oxide, and trace-element geochemical data from rocks collected in the Chistochina mining district, Mount Hayes Quadrangle, Alaska, in 2005-2009

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What does this data set describe?

Title:

Abstract:

Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a geological field survey, including mapping and sampling in the Chistochina mining district in the Mount Hayes A-2 and A-3 quadrangles, Alaska, from June 30 to July 15, 2009. The fieldwork provides basic information critical to building an understanding of Alaska’s geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. During 2009, 57 rock samples were collected for geochemical trace-element analysis, 107 rock samples were collected for whole rock (major- and minor-oxide and petrogenetically important trace elements) analyses, and 2 samples were collected for analysis of non-carbonate carbon content. Additionally, 288 polished rock slabs were analyzed for whole rock and petrogenetically important trace elements. This report also contains geochemical trace-element analyses from the Mount Hayes A-2 Quadrangle, Alaska, for 359 rock samples collected by International Tower Hill Mines Ltd. (ITH) from July 2005 through August 2008 as part of the Chisna Project. These data were kindly donated to DGGS in 2009 to aid DGGS investigations.

Supplemental_Information:

The data are available in tabular format as comma delimited ascii files organized into five layers, as described in this metadata file under the "Entity_and_Attribute_Information" section. The layers are as follows:

DGGS trace-element rock geochemistry: sample locations and
  descriptions, geochemical data, analytical methods and
  detection limits (Tables 1, 2, 3)
DGGS whole rock major-oxides, minor-oxides, and trace-elements:
  sample locations and descriptions, geochemical data, analytical
  methods and detection limits (Tables 4, 5, 6)
DGGS non-carbonate carbon geochemistry: sample locations and
  descriptions, and geochemical data (Table 7)
DGGS rock slab major-oxides, minor-oxides, and trace-elements:
  sample locations and descriptions, geochemical data, analytical
  methods and detection limits (Tables 8 and 9)
ITH trace-element rock geochemistry: sample locations and
  descriptions, geochemical data, analytical methods and
  detection limits (Tables 10, 11, 12)

How should this data set be cited?
Athey, J.E., Freeman, L.K., Hults, C.P., Szumigala, D.J., Werdon, M.B., Denny, C.L., and International Tower Hill Mines Ltd., 2010, Major-oxide, minor-oxide, and trace-element geochemical data from rocks collected in the Chistochina mining district, Mount Hayes Quadrangle, Alaska, in 2005-2009: Raw Data File RDF 2010-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
Online Links:
- <http://dx.doi.org/10.14509/20661>
Other_Citation_Details: 130 pp.
What geographic area does the data set cover?

West_Bounding_Coordinate: -145.1403
East_Bounding_Coordinate: -144.5990
North_Bounding_Coordinate: 63.2217
South_Bounding_Coordinate: 63.0609
What does it look like?
Does the data set describe conditions during a particular time period?

Beginning_Date: 01-Jul-2005
Ending_Date: 15-Jul-2009
Currentness_Reference: ground condition
What is the general form of this data set?

Geospatial_Data_Presentation_Form: tabular 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?
  
  Grid_Coordinate_System_Name: Universal Transverse Mercator
  Universal_Transverse_Mercator:
  
  UTM_Zone_Number: 6
  Transverse_Mercator:
  
  Scale_Factor_at_Central_Meridian: 0.9996
  Longitude_of_Central_Meridian: -147
  Latitude_of_Projection_Origin: 0
  False_Easting: 500000
  False_Northing: 0
  
  Planar coordinates are encoded using coordinate pair
  Abscissae (x-coordinates) are specified to the nearest 0.0000001
  Ordinates (y-coordinates) are specified to the nearest 0.0000001
  Planar coordinates are specified in meters
  
  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 6378137.
  The flattening of the ellipsoid used is 1/298.25722210088.

How does the data set describe geographic features?

Entity_and_Attribute_Overview:

RDF 2010-2 has twelve entities containing attributes that need to be defined. The entities are grouped in five thematic layers under the "Entity_and_Attribute_Information – Detailed_Description" section. The layers are as follows:

DGGS trace-element rock geochemistry: sample locations and
  descriptions (Table 1), geochemical data (Table 2), analytical
  methods and detection limits (Table 3)
DGGS whole rock major-oxides, minor-oxides, and trace-elements:
  sample locations and descriptions (Table 4), geochemical data
  (Table 5), analytical methods and detection limits (Table 6)
DGGS non-carbonate carbon geochemistry: sample locations and
  descriptions, and geochemical data (Table 7)
DGGS rock slab major-oxides, minor-oxides, and trace-elements:
  sample locations and descriptions, and geochemical data (Table
  8), analytical methods and detection limits (Table 9)
ITH trace-element rock geochemistry: sample locations and
  descriptions (Table 10), geochemical data (Table 11),
  analytical methods and detection limits (Table 12)

Entity_and_Attribute_Detail_Citation: This report

Table1.csv

Location and description of rock samples collected by DGGS for trace-element geochemical analyses in the Chistochina mining district, Mount Hayes Quadrangle, Alaska (Source: Alaska Division of Geological & Geophysical Surveys)

Sample Number

Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

Generic example of unique sample identifier: YYYYAAA999X: YYYY=four digit year, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'JEA' = Jennifer Athey; 'LF' = Larry Freeman; 'ACH' = Chad Hults; 'MBW' = Melanie Werdon; 'Z' = David Szumigala.

Latitude

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

Latitude in decimal degrees, NAD 27

Longitude

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

Longitude in decimal degrees, NAD 27

UTM E

Easting (Source: Alaska Division of Geological & Geophysical Surveys)

Easting for UTM Zone 6, NAD 27 projection

UTM N

Northing (Source: Alaska Division of Geological & Geophysical Surveys)

Northing for UTM Zone 6, NAD 27 projection

Zone

UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

06N is the UTM zone for all samples in this data set

Description

Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

Brief rock description

Table2.csv

Trace-element geochemical analyses for rocks collected by DGGS in the Chistochina mining district, Mount Hayes Quadrangle, Alaska. Samples that were not analyzed for a particular attribute were noted in the cell by “---“. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Sample Number

Unique sequential sample identifier (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Au

Gold values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion (FA-ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.001	Below detection limit of 0.001 ppm
>10	Above upper detection limit of 10 ppm

Range of values
Minimum:	0.001
Maximum:	10
Units:	ppm

Au(+)

Gold values acquired by a 30 g traditional fire assay fusion with a gravimetric finish (FA-GRAV) and shown in parts per million (ppm). This procedure was performed on any samples that had greater than detection limit (1000 ppm Au) on the original FA-ICP-AES analysis. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.05
Maximum:	1000
Units:	ppm

Pt

Platinum values acquired by inductively coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion (FA-ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.005	Below detection limit of 0.005 ppm
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.005
Maximum:	10
Units:	ppm

Pd

Palladium values acquired by inductively coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion (FA-ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.001
Maximum:	10
Units:	ppm

Ag

Silver values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.5	Below detection limit of 0.5 ppm

Range of values
Minimum:	0.5
Maximum:	100
Units:	ppm

Al

Aluminum values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

As

Arsenic values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.5	Below detection limit of 0.5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

Ba

Barium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Be

Beryllium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.5	Below detection limit of 0.5 ppm

Range of values
Minimum:	0.5
Maximum:	1000
Units:	ppm

Bi

Bismuth values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<2	Below detection limit of 2 ppm

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Ca

Calcium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Cd

Cadmium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.5	Below detection limit of 0.5 ppm

Range of values
Minimum:	0.5
Maximum:	1000
Units:	ppm

Co

Cobalt values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

Cr

Chromium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

Cu

Copper values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<1	Below detection limit of 1 ppm
>10000	Above upper detection limit of 10000 ppm

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

Cu(+)

Copper values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent (%). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.01
Maximum:	40
Units:	%

Fe

Iron values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Ga

Gallium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

K

Potassium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

La

Lanthanum values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	1000
Units:	ppm

Mg

Magnesium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Mn

Manganese values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	5
Maximum:	100000
Units:	ppm

Mo

Molybdenum values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<1	Below detection limit of 1 ppm

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

Na

Sodium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

Ni

Nickel values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<1	Below detection limit of 1 ppm

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

P

Phosphorus values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Pb

Lead values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<2	Below detection limit of 2 ppm

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

S

Sulfur values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 %

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

Sb

Antimony values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

Sc

Scandium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<1	Below detection limit of 1 ppm

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

Sr

Strontium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	1
Maximum:	10000

Th

Thorium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Value	Definition
<20	Below detection limit of 20 ppm

Range of values
Minimum:	20
Maximum:	10000
Units:	ppm

Ti

Titanium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent (%). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 %

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

Tl

Thallium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

U

Uranium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

V

Vanadium values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

W

Tungsten values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Zn

Zinc values acquired by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Table3.csv

Detection limits and geochemical methods for trace-element geochemical analyses of DGGS rock samples. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Element

Chemical symbol of element analyzed (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Formal codeset
Codeset Name:	Chemical symbol
Codeset Source:	Periodic Table of the Elements, National Institute of Standards and Technology NIST SP 966 (September 2003)

Units

Chemical composition units (by weight) (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Value	Definition
ppm	parts per million
%	percent

Lower Detection Limit

The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

The minimum concentration that a geochemical determination can be reliably made for the given method.

Upper Detection Limit

Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

The maximum concentration that a geochemical determination can be reliably made for the given method.

Analytical Method

Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological &Geophysical Surveys and ALS Chemex)

Value	Definition
FA-ICP-AES	Inductively coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion.
FA-GRAV	Fire assay with a gravimetric finish using a 30 gram sub-sample.
ICP-AES	Inductively coupled plasma-atomic emission spectroscopy

Digestion

Method used to get the sample into a form that is used by the analytical method to determine geochemical concentrations. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Value	Definition
---	not applicable
4 Acid	four-acid (HNO3-HClO4-HF + HCl), near-total digestion

Table4.csv

Location and description of rocks collected by DGGS for major-oxide, minor-oxide, and trace-element analyses in the Chistochina mining district, Mount Hayes Quadrangle, Alaska. (Source: Alaska Division of Geological & Geophysical Surveys)

Sample Number

Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

Latitude

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

Latitude in decimal degrees, NAD 27

Longitude

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

Longitude in decimal degrees, NAD 27

UTM E

Easting (Source: Alaska Division of Geological & Geophysical Surveys)

Easting for UTM Zone 6, NAD 27

UTM N

Northing (Source: Alaska Division of Geological & Geophysical Surveys)

Northing for UTM Zone 6, NAD 27

Zone

UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

06N is the UTM zone for all samples in this data set

Description

Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

Brief rock description

Table5.csv

Major-oxide, minor-oxide, and trace element analyses for rocks collected by DGGS in the Chistochina mining district, Mount Hayes Quadrangle, Alaska. (Source: Alaska Division of Geological & Geophysical Surveys)

Sample

Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

SiO2

SiO2 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

Al2O3

Al2O3 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

Fe2O3

Fe2O3 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. All iron is expressed as Fe2O3. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

CaO

CaO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

MgO

MgO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

Na2O

Na2O values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

K2O

K2O values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

Cr2O3

Cr2O3 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 %

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

TiO2

TiO2 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

MnO

MnO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

P2O5

P2O5 values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.001
Maximum:	100
Units:	%

SrO

SrO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

BaO

BaO values acquired by analysis with lithium borate fusion and X-ray fluorescence spectrometry (LBF-XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 %

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

LOI

Loss on ignition (LOI) values expressing loss of mass determined by gravimetric measurement after heating to 1000 degrees Celsius and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	100
Units:	%

Total

Calculated total for oxides in sample. Shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	98.71
Maximum:	100.15
Units:	%

Ba

Barium values acquired by pressed pellet analysis with X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Nb

Niobium values acquired by pressed pellet analysis with X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<2	Below detection limit of 2 ppm

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Rb

Rubidium values acquired by pressed pellet analysis with X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
<2	Below detection limit of 2 ppm

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Sr

Strontium values acquired by pressed pellet analysis with X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Y

Yttrium values acquired by pressed pellet analysis with X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Zr

Zirconium values acquired by preseed pellet analysis with X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Table6.csv

Detection limits and geochemical methods for major- and minor-oxide and trace-metal analyses of DGGS whole-rock samples. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Element

Chemical formula of element or oxide component analyzed (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Value	Definition
Fe2O3	Total iron content calculated as ferric iron
LOI	Loss on ignition, difference after heating to 1000 degrees Celsius determined by gravimetric measurement
Total	Sum of the concentrations of all the oxides and LOI

Formal codeset
Codeset Name:	Chemical symbol
Codeset Source:	Periodic Table of the Elements, National Institute of Standards and Technology NIST SP 966 (September 2003)

Chemical formulas based on the chemical symbol codeset.

Units

Chemical composition units (by weight) (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

Value	Definition
%	percent
ppm	parts per million

Lower Detection Limit

The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

The minimum concentration that a geochemical determination can be reliably made for the given method.

Upper Detection Limit

Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex)

The maximum concentration that a geochemical determination can be reliably made for the given method.

Analytical Method

Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological &Geophysical Surveys and ALS Chemex)

Value	Definition
LBF-XRF	lithium borate fusion, X-ray fluorescence spectrometry
gravimetric	A value determined by gravimetric measurement
calculation	A value determined by computation
Pressed pellet-XRF	X-ray fluorescence spectrometry determined on a pressed pellet

Table7.csv

Location, description, and analyses of rocks collected by DGGS for non-carbonate carbon analysis in the Chistochina mining district, Mount Hayes Quadrangle, Alaska. (Source: Alaska Division of Geological & Geophysical Surveys)

Sample Number

Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

Latitude

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

Latitude in decimal degrees, NAD 27

Longitude

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

Longitude in decimal degrees, NAD 27

UTM E

Easting (Source: Alaska Division of Geological & Geophysical Surveys)

Easting for UTM Zone 6, NAD 27

UTM N

Northing (Source: Alaska Division of Geological & Geophysical Surveys)

Northing for UTM Zone 6, NAD 27

Zone

UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

06N is the UTM zone for all samples in this data set

Description

Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys)

Brief rock description

Non-carbonate Carbon (%)

Non-carbonate carbon values acquired by analysis using induction furnace pyrolysis following dilute acid digestion and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Table8.csv

Major-oxide, minor-oxide, and trace-element analyses for rocks collected by DGGS in the Chistochina mining district, Mount Hayes Quadrangle, Alaska. Analyses were conducted on polished rock slabs. Because volatile components were not measured and rocks were of varying porosities, the analyses were normalized to 100 percent totals. (Source: Alaska Division of Geological & Geophysical Surveys)

Sample

Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

Latitude

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

Latitude in decimal degrees, NAD 27

Longitude

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

Longitude in decimal degrees, NAD 27

UTM E

Easting (Source: Alaska Division of Geological & Geophysical Surveys)

Easting for UTM Zone 6, NAD 27

UTM N

Northing (Source: Alaska Division of Geological & Geophysical Surveys)

Northing for UTM Zone 6, NAD 27

Zone

UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys)

06N is the UTM zone for all samples in this data set

Root Name

Lithology derived from geochemical data and rock textures in hand sample. (Source: Alaska Division of Geological & Geophysical Surveys)

Lithology

Comments

Analyses were conducted on polished rock slabs, except for sample 2009LF93F, which was made into a pressed pellet. The quality of the pressed pellet analysis is higher than any polished slab analysis. Remarks in the Comments column such as small, porous, or inhomogeneous indicate that the quality of the analysis is lower than average/normal. (Source: Alaska Division of Geological & Geophysical Surveys)

Value	Definition
inhomogeneous	Polished slab contained crystals or clasts > 3 mm or a texture such as banding.
small	Polished slab is smaller than the 37-mm-diameter sample holder.
small, inhomogeneous	Polished slab is smaller than the 37-mm-diameter sample holder, and contains crystals or clasts > 3 mm or a texture such as banding.
porous	Sample is porous
porous, poor polish	Sample is porous and has a poor polish.
pressed pellet	Analysis was conducted on a pressed pellet and not a polished slab.
quartz vein	Sample contains a quartz vein.

SiO2

SiO2 values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.1
Maximum:	100
Units:	%

Al2O3

Al2O3 values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.1
Maximum:	100
Units:	%

BaO

BaO values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.02
Maximum:	100
Units:	%

CaO

CaO values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.05
Maximum:	100
Units:	%

Fe2O3

Fe2O3 values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. All iron is expressed as Fe2O3. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.05
Maximum:	100
Units:	%

K2O

K2O values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.05
Maximum:	100
Units:	%

MgO

MgO values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.1
Maximum:	100
Units:	%

MnO

MnO values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.02
Maximum:	100
Units:	%

Na2O

Na2O values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.1
Maximum:	100
Units:	%

P2O5

P2O5 values acquired by acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.05
Maximum:	100
Units:	%

TiO2

TiO2 values acquired by X-ray fluorescence spectrometry (XRF) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	0.02
Maximum:	100
Units:	%

Total

Sum of oxides; oxides are normalized to 100 percent. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	100
Maximum:	100
Units:	%

Rb

Rubidium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
<2	Below detection limit of 2 ppm

Range of values
Minimum:	2
Maximum:	1000
Units:	ppm

Sr

Strontium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Range of values
Minimum:	2
Maximum:	1000
Units:	ppm

Y

Yttrium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	1000
Units:	ppm

Zr

Zirconium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	1000
Units:	ppm

Nb

Niobium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
<1	Below detection limit of 1 ppm

Range of values
Minimum:	1
Maximum:	1000
Units:	ppm

As

Arsenic values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

Cl

Chlorine values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	50
Maximum:	50000
Units:	ppm

Cr

Chromium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Cu

Copper values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

F

Fluorine values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<100	Below detection limit of 100 ppm

Range of values
Minimum:	100
Maximum:	50000
Units:	ppm

Ga

Gallium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	1000
Units:	ppm

Ni

Nickel values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

Pb

Lead values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

S

Sulfur values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<30	Below detection limit of 30 ppm

Range of values
Minimum:	30
Maximum:	50000
Units:	ppm

Se

Selenium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<5	Below detection limit of 5 ppm

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

Th

Thorium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	2
Maximum:	1000
Units:	ppm

U

Uranium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<2	Below detection limit of 2 ppm

Range of values
Minimum:	2
Maximum:	1000
Units:	ppm

V

Vanadium values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

W

Tungsten values acquired by X-ray flourescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Zn

Zinc values acquired by X-ray fluorescence spectrometry (XRF) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	5
Maximum:	10000
Units:	ppm

Table9.csv

Detection limits and geochemical methods for for major- and minor-oxide and trace metal analyses of whole-rock samples. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Element

Chemical formula of element or oxide component analyzed (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
Fe2O3	Total iron content calculated as ferric iron

Formal codeset
Codeset Name:	Chemical symbol
Codeset Source:	Periodic Table of the Elements, National Institute of Standards and Technology NIST SP 966 (September 2003)

Chemical formulas based on the chemical symbol codeset.

Units

Chemical composition units (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
%	percent
ppm	parts per million

Lower Detection Limit

The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

The minimum concentration that a geochemical determination can be reliably made for the given method.

Upper Detection Limit

Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

The maximum concentration that a geochemical determination can be reliably made for the given method.

Analytical Method

Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks.)

Value	Definition
XRF	X-ray fluorescence spectrometry
Calculation	Sum of normalized oxides (LOI was not measured)

Table10.csv

Location and description of rock samples collected by ITH for trace-element geochemical analyses in the Chistochina mining district, Mount Hayes Quadrangle, Alaska. (Source: Alaska Division of Geological & Geophysical Surveys)

Sample Number

Unique sequential sample identifier (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Generic example of unique sample identifier: RKXXXXXX: RK=rock; XXXXXX=unique station number.

Latitude

Latitude (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Latitude in decimal degrees, NAD 27

Longitude

Longitude (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Longitude in decimal degrees, NAD 27

UTM E

Easting (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Easting for UTM Zone 6, NAD 27

UTM N

Northing (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Northing for UTM Zone 6, NAD 27

Zone

UTM Zone (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

06N is the UTM zone for all samples in this data set

Description

Brief rock description (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Brief rock description

Table11.csv

Trace-element geochemical analyses for rocks collected by ITH in the Chistochina mining district, Mount Hayes Quadrangle, Alaska, by International Tower Hill Mines Ltd. Samples that were not analyzed for a particular element are left as an empty or null field noted by “---“. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Sample Number

Unique sequential sample identifier (Source: Alaska Division of Geological & Geophysical Surveys and International Tower Hill Mines Ltd.)

Generic example of unique sample identifier: RKXXXXXX: RK=rock; XXXXXX=unique station number.

Au

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.001
Maximum:	10
Units:	ppm

Au(2)

Gold values acquired by analysis with atomic absorption spectroscopy following a 30 g fire assay fusion (FA-AAS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<0.005	Below detection limit of 0.005 ppm
>10.0	Above detection limit of 10 ppm
NSS	Not sufficient sample to perform analysis

Range of values
Minimum:	0.005
Maximum:	10
Units:	ppm

Au(+)

Gold values acquired by a 30 g traditional fire assay fusion with a gravimetric finish (FA-GRAV) and shown in parts per million (ppm). This procedure was performed on any samples that had greater than detection limit (10 ppm Au) on the original FA-AAS analysis. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.05
Maximum:	1000
Units:	ppm

Ag

Silver values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 ppm
>100	Above detection limit of 100 ppm

Range of values
Minimum:	0.01
Maximum:	100
Units:	ppm

Ag(+)

Silver values by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in parts per million (ppm). This procedure was performed on any samples that had greater than detection limit (100 ppm Ag) on the original ICP-MS analysis. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	1
Maximum:	1500
Units:	ppm

As

Arsenic values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.2	Below detection limit of 0.2 ppm

Range of values
Minimum:	0.2
Maximum:	10000
Units:	ppm

Sb

Antimony values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.05	Below detection limit of 0.05 ppm

Range of values
Minimum:	0.05
Maximum:	10000
Units:	ppm

Cu

Copper values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
>10000	Above detection limit of 10000 ppm

Range of values
Minimum:	0.2
Maximum:	10000
Units:	ppm

Cu(+)

Copper values by analysis with inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and shown in percent (%). This procedure was performed on any samples that had greater than detection limit (10000 ppm Cu) on the original ICP-MS analysis. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.001
Maximum:	40
Units:	%

Pb

Lead values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.5
Maximum:	10000
Units:	ppm

Zn

Zinc values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	2
Maximum:	10000
Units:	ppm

Al

Aluminum values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Ba

Barium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<10	Below detection limit of 10 ppm

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Be

Beryllium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.05	Below detection limit of 0.05 ppm

Range of values
Minimum:	0.05
Maximum:	1000
Units:	ppm

Bi

Bismuth values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 ppm

Range of values
Minimum:	0.01
Maximum:	10000
Units:	ppm

Ca

Calcium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Cd

Cadmium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.02	Below detection limit of 0.02 ppm

Range of values
Minimum:	0.02
Maximum:	1000
Units:	ppm

Ce

Cerium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	500
Units:	ppm

Co

Cobalt values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.1
Maximum:	10000
Units:	ppm

Cr

Chromium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<1	Below detection limit of 1 ppm

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

Cs

Cesium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.05	Below detection limit of 0.05 ppm

Range of values
Minimum:	0.05
Maximum:	500
Units:	ppm

Fe

Iron values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
>50	Above detection limit of 50%

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Ga

Gallium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.05
Maximum:	10000
Units:	ppm

Ge

Germanium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.05	Below detection limit of 0.05 ppm

Range of values
Minimum:	0.05
Maximum:	500
Units:	ppm

Hf

Hafnium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.1	Below detection limit of 0.1 ppm

Range of values
Minimum:	0.1
Maximum:	500
Units:	ppm

Hg

Mercury values acquired by atomic absorbtion spectroscopy (AAS) following aqua regia digestion/cold vapor and is shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute
<0.01	Below detection limit of 0.01 ppm

Range of values
Minimum:	0.01
Maximum:	100
Units:	ppm

In

Indium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.005	Below detection limit of 0.005 ppm

Range of values
Minimum:	0.005
Maximum:	500
Units:	ppm

K

Potassium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01%

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

La

Lanthanum values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.5	Below detection limit of 0.5 ppm

Range of values
Minimum:	0.5
Maximum:	10000
Units:	ppm

Li

Lithium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.2
Maximum:	10000
Units:	ppm

Mg

Magnesium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Mn

Manganese values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	5
Maximum:	100000
Units:	ppm

Mo

Molybdenum values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.05
Maximum:	10000
Units:	ppm

Na

Sodium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01%

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

Nb

Niobium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.1
Maximum:	500
Units:	ppm

Ni

Nickel values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.2	Below detection limit of 0.2 ppm

Range of values
Minimum:	0.2
Maximum:	10000
Units:	ppm

P

Phosphorus values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	10
Maximum:	10000
Units:	ppm

Rb

Rubidium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.1	Below detection limit of 0.1 ppm

Range of values
Minimum:	0.1
Maximum:	10000
Units:	ppm

Re

Rhenium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.002	Below detection limit of 0.002 ppm

Range of values
Minimum:	0.002
Maximum:	50
Units:	ppm

S

Sulfur values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.01	Below detection limit of 0.01 ppm
>10	Above detection limit of 10%

Range of values
Minimum:	0.01
Maximum:	10
Units:	%

S(+)

Sulfur values by Leco furnace and shown in percent (%). This procedure was performed on any samples that had greater than detection limit (10% S) on the original ICP-MS analysis. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.01
Maximum:	50
Units:	%

Sc

Scandium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	Null value; sample not analyzed for this attribute

Range of values
Minimum:	0.1
Maximum:	10000
Units:	ppm

Se

Selenium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<1	Below detection limit of 1 ppm

Range of values
Minimum:	1
Maximum:	1000
Units:	ppm

Sn

Tin values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.2	Below detection limit of 0.2 ppm

Range of values
Minimum:	0.2
Maximum:	500
Units:	ppm

Sr

Strontium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.2
Maximum:	10000
Units:	ppm

Ta

Tantalum values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.05	Below detection limit of 0.05 ppm

Range of values
Minimum:	0.05
Maximum:	100
Units:	ppm

Te

Tellurium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.05	Below detection limit of 0.05 ppm

Range of values
Minimum:	0.05
Maximum:	500
Units:	ppm

Th

Thorium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.2	Below detection limit of 0.2 ppm

Range of values
Minimum:	0.2
Maximum:	10000
Units:	ppm

Ti

Titanium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in percent (%). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.005	Below detection limit of 0.005%

Range of values
Minimum:	0.005
Maximum:	10
Units:	%

Tl

Thallium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.02	Below detection limit of 0.02 ppm

Range of values
Minimum:	0.02
Maximum:	10000
Units:	ppm

U

Uranium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.1	Below detection limit of 0.1 ppm

Range of values
Minimum:	0.1
Maximum:	10000
Units:	ppm

V

Vanadium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	1
Maximum:	10000
Units:	ppm

W

Tungsten values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). Possibly incomplete digestion for this element, depending on mineralogy of sample, may result in lower analytical results. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.1	Below detection limit of 0.1 ppm

Range of values
Minimum:	0.1
Maximum:	10000
Units:	ppm

Y

Yttrium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Range of values
Minimum:	0.1
Maximum:	500
Units:	ppm

Zr

Zirconium values acquired by analysis with inductively coupled plasma-mass spectroscopy (ICP-MS) and shown in parts per million (ppm). (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
<0.5	Below detection limit of 0.5 ppm

Range of values
Minimum:	0.5
Maximum:	500
Units:	ppm

Table12.csv

Detection limits and geochemical methods for trace-element geochemical analyses of rock samples collected by International Tower Hill Mines Ltd. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Element

Chemical symbol of element analyzed (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Formal codeset
Codeset Name:	Chemical symbol
Codeset Source:	Periodic Table of the Elements, National Institute of Standards and Technology NIST SP 966 (September 2003)

Units

Chemical composition units (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
ppm	parts per million
%	percent

Lower Detection Limit

The lowest concentration at which the element can be detected (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

The minimum concentration that a geochemical determination can be reliably made for the given method.

Upper Detection Limit

Value above which concentrations can not be accurately determined. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

The maximum concentration that a geochemical determination can be reliably made for the given method.

Analytical Method

Instrumental method used by laboratory to determine concentration values. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
FA-ICP-AES	Inductive coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion.
FA-AAS	Fire assay with an atomic absorption spectroscopy determination.
FA-GRAV	Fire assay with a gravimetric finish using a 30 gram sub-sample.
ICP-MS	Inductive coupled plasma-mass spectroscopy
ICP-AES	Inductive coupled plasma-atomic emission spectroscopy
AAS	Atomic absorption spectroscopy.
Leco	Leco furnace

Digestion

Method used to get the sample into a form that is used by the analytical method to determine geochemical concentrations. (Source: Alaska Division of Geological & Geophysical Surveys, International Tower Hill Mines Ltd., and ALS Chemex.)

Value	Definition
---	not applicable
4 Acid	four-acid (HNO3-HClO4-HF + HCl), near-total digestion
AR/CV	aqua regia/cold vapor

Who produced the data set?

Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
- Athey, J.E.
- Freeman, L.K.
- Hults, C.P.
- Szumigala, D.J.
- Werdon, M.B.
- Denny, C.L.
- International Tower Hill Mines Ltd.
Who also contributed to the data set?

This project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. Partial funding for the geologic mapping and geochemical analyses was also provided through the U.S. Geological Survey STATEMAP Program under award number G09AC00177 and the Alaska State General Fund.
To whom should users address questions about the data?

Why was the data set created?

The analyses in this report were acquired as part of a geologic mapping program, the purpose of which is to provide 1:50,000-scale geologic mapping of a portion of the Slate Creek-Slana River airborne geophysical surveys released by DGGS in 2009 (Burns et al., 2009). The geophysical survey (helicopter-based aeromagnetic and electromagnetic data) and geologic mapping are part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program, a special multi-year investment by the State of Alaska to expand Alaska's geologic and mineral resources knowledge base, catalyze future private-sector mineral exploration and development, and guide state resource development planning.

How was the data set created?

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

Date: Jul-2009 (process 1 of 10)
Fieldwork - Rock samples of visibly mineralized rock, or rock exhibiting features associated with mineralization, were collected and analyzed for geochemical trace elements. Spatially these rocks were collected randomly. Occasionally rocks exhibiting a specifc feature were selectively collected and these instances were noted in the sample description.

Date: Jul-2009 (process 2 of 10)
Fieldwork - Rock samples collected for whole-rock (major oxides, minor oxides, and trace elements) analysis include samples representative of a typical lithology, igneous or possible meta-igneous samples in order to determine composition, and samples whose petrogenetically important trace-elements could indicate their original tectonic setting. Unweathered or minimally weathered rock samples were preferentially selected for analysis. Spatially these rocks were collected randomly.

Date: Jul-2009 (process 3 of 10)
Fieldwork - Rock samples of visibly carbonaceous or graphitic rock were collected and analyzed for non-carbonate carbon content. Spatially these rocks were collected randomly. Unweathered or minimally weathered rock samples were preferentially selected for analysis.

Date: Dec-2009 (process 4 of 10)
Sample Preparation – All sample preparation was conducted at the ALS Chemex sample preparation facility in Fairbanks, Alaska, except for preparation of whole-rock samples for analysis at the University of Alaska Fairbanks. Rocks intended for whole-rock analysis by ALS Chemex and with a weathering rind were trimmed with a tile saw prior to sample preparation at the laboratory. Rock samples were crushed with a Terminator oscillating jaw crusher with chrome steel alloy plates so that at least 70 percent of the material passes through a -10 mesh (2 mm) screen. Representative aliquots of 250 grams each were taken using a stainless steel riffle splitter. These samples were then pulverized in a chrome steel ring mill so that 85 percent of the sample passed through a -200 mesh (75 micron) screen. Trace-element analyses, whole-rock oxide analyses, and gold analyses were performed using representative splits of each 250 gram pulp.

Date: Dec-2009 (process 5 of 10)
Analysis, Tables 1–3 - All potentially mineralized samples were assayed for gold by inductively coupled plasma-atomic emission spectroscopy following a 30 gram (g) fire assay fusion (FA-ICP-AES). Platinum and palladium were assayed for selected samples by inductively coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion (FA-ICP-AES). Trace-element geochemical analyses were performed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. The elements that may be affected by incomplete digestion, analytical methods, and lower and upper reporting limits are tabulated in Table 3. Rock samples with trace gold and/or copper values above the detection limit in the initial trace element geochemical analysis were reanalyzed for those metals by the following methods: gold, fire assay with a gravimetric finish using a 30 gram sub-sample; copper, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. Detection limits for the second set of analyses are listed in Table 3.

Date: Dec-2009 (process 6 of 10)
Analysis, Tables 4–6 - Major- and minor-element oxides were determined at ALS Chemex by XRF following a lithium borate fusion. Trace-element values for Ba, Nb, Rb, Sr, Y, and Zr were determined by XRF on a pressed pellet. Analytical methods and detection limits are tabulated in Table 6.

Date: Dec-2009 (process 7 of 10)
Analysis, Table 7 - Non-carbonate carbon analyses were performed by ALS Chemex. Non-carbonate carbon content was determined using a LECO furnace after a dilute acid digestion. The lower detection limit for non-carbonate carbon is 0.01 percent, and the upper detection limit is 50.00 percent.

Date: Dec-2009 (process 8 of 10)
Analysis, Tables 8–9 - XRF spectroscopic analyses performed at UAF were standardized using well-characterized natural fine-grained rock and pure mineral standards as well as conventional pressed pellets of international rock standards. Because volatile components were not measured and rocks were of varying porosities, the analyses were normalized to 100 percent totals. In the vast majority of cases the original analyses yielded totals of approximately 95 to 102 weight percent. Comparison between these analyses and those produced on the same rocks by conventional pressed pellet (trace elements) and fused disk (major and minor oxides) techniques indicates that major- and minor-oxide and trace-element concentrations are most likely within 10 percent of the ‘true’ concentrations. Analytical methods and detection limits are tabulated in Table 9.

Date: 2008 (process 9 of 10)
Analysis, Tables 10–12 - All samples were analyzed for gold using a 50 g fire assay fusion and either ICP-AES or atomic absorption spectrometry (AAS). Trace-element geochemical analyses were performed by inductively coupled plasma-mass spectrometry (ICP-MS) methods after four-acid, near-total digestion. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. Samples with greater than 10 percent calcium and showing interference were reanalyzed by ICP-AES, and these results are shown. Mercury was analyzed by aqua regia digestion/cold vapor-AAS (detection limits on samples requiring dilutions for mercury analysis were increased according to the dilution factor). The elements that may be affected by incomplete digestion, analytical methods, and lower and upper reporting limits are tabulated in Table 12. Rock samples with trace metal values above the detection limit in the initial trace element geochemical analysis were reanalyzed for those metals by the following methods: gold, fire assay with a gravimetric finish using a 50 gram sub-sample; silver and copper, ICP-AES methods after four-acid, near-total digestion; sulfur, total sulfur by Leco furnace. Detection limits for the second set of analyses are listed in Table 12.

Date: Jan-2010 (process 10 of 10)
Other - Latitude and Longitude values in Tables 1, 3, 7, 8, and 10 were converted from UTM values using a spreadsheet designed by Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay, <http://www.uwgb.edu/dutchs/usefuldata/UTMFormulas.HTM>.
What similar or related data should the user be aware of?
Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2009, Line, grid, and vector data, and maps for the airborne geophysical survey of the Slate Creek-Slana River Survey, Chistochina mining district, south-central Alaska: Alaska Division of Geological & Geophysical Surveys Geophysical Report GPR 2009-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK.
Online Links:
- <http://dx.doi.org/10.14509/19621>
Other_Citation_Details: 1 database, 6 grids, 6 vector files, and 18 maps

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

How well have the observations been checked?
All major-oxide, minor-oxide, and trace-element geochemical analyses were performed by ALS Chemex, except for those performed on polished rock slabs by the University of Alaska Fairbanks (UAF). Analytical methods and detection limits are located in the “Entity_and_Attribute_Information” section for tables 3, 6, 7, 9, and 12. This information is also described in the report text and the tables mentioned above. Aside from ALS Chemex’s own internal quality control program, DGGS monitored analysis quality by inserting a sample of known composition into the sample roster for every batch of 20 samples. The analytical results were statistically compared to similar standard compositions for the past ~10 years. ITH also monitored analysis quality by inserting samples of known composition into the sample roster, but the frequency of their checks is unknown. Analyses performed at UAF were standardized using well-characterized natural fine-grained rock and pure mineral standards as well as conventional pressed pellets of international rock standards.
How accurate are the geographic locations?
Location data collected by DGGS were downloaded from Garmin 12XL GPS units into an Access database. ITH location data were recorded by PDAs with an integrated GPS unit.
How accurate are the heights or depths?
Where are the gaps in the data? What is missing?
This dataset contains all of the analyses for trace-element geochemistry, whole rock (major- and minor-oxide, and trace element) geochemistry, and non-carbonate-carbon analyses for rock samples collected by DGGS in the Slate Creek project area in 2009. This dataset also contains Slate Creek area trace-element geochemical data collected by ITH, which is a subset of the data collected for the Chisna Project from 2005-2009.
How consistent are the relationships among the observations, including topology?
No topologic relationships are present in data.

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 are 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. 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.

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

State of Alaska, Department of Natural Resources, 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 web site (<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?
Raw Data File 2010-2
What legal disclaimers am I supposed to read?

The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester 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:
  Current publication is available on paper. 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.
- Cost to order the data:
  Printed publication can be purchased for $13.00 (contact information below) plus shipping if mailed.
- Availability in digital form:
  
  Data format: PDF (version 1.6)
  
  Network links: <http://dx.doi.org/10.14509/20661>
  
  Data format: CSV
  
  Network links: <http://dx.doi.org/10.14509/20661>
- Cost to order the data:
  Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files.
- Special instructions:
  
  Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (<http://www.dggs.alaska.gov/>) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard.
- How long will it take to get the data?
  
  Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.
What hardware or software do I need in order to use the data set?

CSV (Comma Separated Value) files can be imported and formatted with Microsoft Excel, OpenOffice.org Calc, or most spreadsheet and text editor programs.

Who wrote the metadata?

Dates:

Last modified: 20-Apr-2010

Metadata author:

State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
c/o Jennifer Athey
Geologist
3354 College Road
Fairbanks, AK 99709-3707
USA

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

Hours_of_Service:: 8:00 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:: Please contact us through the e-mail address given above whenever possible.

Metadata standard:

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

Generated by mp version 2.9.6 on Tue Apr 20 15:52:55 2010

Data format:	PDF (version 1.6)
Network links:	<http://dx.doi.org/10.14509/20661>