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

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Title:
Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska
Abstract:
During the 2018 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-5 and B-6 quadrangles. The project area has produced approximately 122,000 ounces of gold (Singh and others, 2017), mostly from placer mines, and it includes the Richardson, Tower, and Hilltop lode gold exploration properties. Rock outcrop accounts for much less than one percent of the study area, consequently, many of the rock samples were collected from up to 1-meter-deep pits dug with shovels into rocky colluvial deposits below the surficial loess. Highlights of the geochemical results include 43.3 and 9.77 parts per million (ppm) gold sampled from arsenopyrite-bearing quartz veins at the Hilltop prospect. At the Democrat prospect, formerly the site of small-scale mining, a sample of sulfide-rich material returned 3,790 ppm silver and 4.72 ppm gold. Other samples from the Democrat prospect assayed 6.81 and 5.01 ppm gold. The analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files. All files can be downloaded from the DGGS website (<http://doi.org/10.14509/30119>).
Supplemental_Information:
major-oxide-trace-element: Major- and minor-oxide and trace-element analysis of rock samples; includes magnetic susceptibility measurements 
trace-element: Trace-element analysis of rock samples; includes magnetic susceptibility measurements
  1. How should this data set be cited?

    Twelker, Evan, Wypych, Alicja, Sicard, K.R., Naibert, T.J., Montayne, Simone, Newberry, R.J., and Wyatt, W.C., 2018, Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska: Raw Data File RDF 2018-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -146.716284
    East_Bounding_Coordinate: -141.005636
    North_Bounding_Coordinate: 64.533013
    South_Bounding_Coordinate: 64.248344

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2018
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: report and digital data

  6. 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.

  7. How does the data set describe geographic features?

    rdf2018-6-major-oxide-trace-element.csv, rdf2018-6-major-oxide-trace-element-limits.csv
    Major- and minor-oxide and trace-element analysis of rock samples; 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: YYAAA999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 999=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)

    ValueDefinition
    NULLThe 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)

    ValueDefinition
    NULLThe lab sample number is identical to the sample number.

    FA18220953

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

    Range of values
    Minimum:-146.7003502
    Maximum:-146.1085368
    Units:decimal degrees

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

    Range of values
    Minimum:64.25733675
    Maximum:64.52402
    Units:decimal degrees

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

    A brief sample description.

    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.004
    Maximum:0.072
    Units:parts per million

    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:42.8
    Maximum:82.8
    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:8.3
    Maximum:26.8
    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:0.58
    Maximum:15.65
    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:0.01
    Maximum:18.75
    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:0.01
    Maximum:11.75
    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:0.04
    Maximum:5.64
    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:0.11
    Maximum:8.34
    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 = 0.002 pct; Upper detection limit = 100 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.002
    Maximum:0.097
    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:0.02
    Maximum:3.51
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:0.49
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:0.85
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:0.1
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:0.3
    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:0.18
    Maximum:6.41
    Units:percent

    Total_pct_TOT-ICP06
    Total values measured in percent; Method: Calculation (Calc); Lower detection limit = pct; Upper detection limit = pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

    Range of values
    Minimum:98.06
    Maximum:101.56
    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)

    ValueDefinition
    -1Below detection limit.

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

    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)

    ValueDefinition
    -2Above detection limit.

    Range of values
    Minimum:0.2
    Maximum:140.5
    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:15.3
    Maximum:2600
    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:8.56
    Units:parts per million

    C_pct_C-IR07
    Carbon values measured in percent; Method: Combustion Furnace (CF); 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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:2.99
    Units:percent

    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.5
    Maximum:0.9
    Units:parts per million

    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 = 0.1 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:1.6
    Maximum:245
    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)

    ValueDefinition
    -1Below detection limit.

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

    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:710
    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:0.14
    Maximum:28.1
    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:167
    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:1.41
    Maximum:21.7
    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:0.69
    Maximum:10.25
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.05
    Maximum:3.31
    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:8.6
    Maximum:39
    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:1.1
    Maximum:23.6
    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)

    ValueDefinition
    -1Below detection limit.

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

    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:0.2
    Maximum:19.9
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.005
    Maximum:1.1
    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 = 10000 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

    Range of values
    Minimum:0.26
    Maximum:3.86
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.005
    Maximum:0.119
    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 = 0.1 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:0.2
    Maximum:128
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:10
    Maximum:150
    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:0.1
    Maximum:1.08
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:1
    Maximum:11
    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:0.2
    Maximum:122
    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:106
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:1
    Maximum:153
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:2
    Maximum:187
    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:0.32
    Maximum:29.4
    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:2.2
    Maximum:548
    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)

    ValueDefinition
    -1Below detection limit.

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

    S_pct_S-IR08
    Sulfur values measured in percent; Method: Combustion Furnace (CF); 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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:0.84
    Units:percent

    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:0.07
    Maximum:25
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:2
    Maximum:42
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.2
    Maximum:1.9
    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:0.78
    Maximum:22.4
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:1
    Maximum:70
    Units:parts per million

    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:6.3
    Maximum:825
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.1
    Maximum:11.3
    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:0.2
    Maximum:3.71
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:0.18
    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:0.1
    Maximum:39.4
    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 = 0.2 ppm; Upper detection limit = 250 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.02
    Maximum:1.39
    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:0.1
    Maximum:1.34
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.18
    Maximum:7.75
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:5
    Maximum:426
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:1
    Maximum:19
    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 = 0.1 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:7
    Maximum:99.7
    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:0.73
    Maximum:7.79
    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:5
    Maximum:250
    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:5
    Maximum:825
    Units:parts per million

    MAG_1
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0
    Maximum:25.2
    Units:10^-3 SI

    MAG_2
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0
    Maximum:13.2
    Units:10^-3 SI

    MAG_3
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0
    Maximum:77.4
    Units:10^-3 SI

    MAG_4
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.01
    Maximum:15.3
    Units:10^-3 SI

    MAG_5
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0
    Maximum:79.9
    Units:10^-3 SI

    MAG_6
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.03
    Maximum:18.5
    Units:10^-3 SI

    MAG_7
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.03
    Maximum:65.9
    Units:10^-3 SI

    MAG_8
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.05
    Maximum:61.6
    Units:10^-3 SI

    MAG_9
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.03
    Maximum:71.7
    Units:10^-3 SI

    MAG_10
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.14
    Maximum:54.4
    Units:10^-3 SI

    MAG_11
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.179
    Maximum:13
    Units:10^-3 SI

    MAG_12
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.164
    Maximum:4.7
    Units:10^-3 SI

    rdf2018-6-trace-element.csv, rdf2018-6-trace-element-limits.csv
    Trace-element analysis of rock samples; 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: YYAAA999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 999=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)

    ValueDefinition
    NULLThe 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)

    ValueDefinition
    NULLThe lab sample number is identical to the sample number.

    FA18220938

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

    Range of values
    Minimum:-146.7072911
    Maximum:-146.1069021
    Units:decimal degrees

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

    Range of values
    Minimum:64.25868397
    Maximum:64.43664355
    Units:decimal degrees

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

    A brief sample description.

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

    Range of values
    Minimum:0.25
    Maximum:2.62
    Units:kilograms

    Au_ppm_Au-GRA21
    Gold values measured in parts per million; Method: Fire Assay - Gravimetric (FA-GRAV), Fire Assay; 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)

    ValueDefinition
    NULLBlank (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:9.77
    Maximum:43.3
    Units:parts per million

    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)

    ValueDefinition
    -1Below detection limit.
    -2Above detection limit.

    Range of values
    Minimum:0.001
    Maximum:6.81
    Units:parts per million

    Ag_ppm_Ag-GRA21
    Silver values measured in parts per million; Method: Fire Assay - Gravimetric (FA-GRAV), Fire Assay; 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)

    ValueDefinition
    NULLBlank (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:3790
    Maximum:3790
    Units:parts per million

    Ag_ppm_Ag-OG62
    Silver values measured in parts per million; Method: Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES), HNO3 -HClO4 -HF-HCl; Lower detection limit = 1 ppm; Upper detection limit = 1500 ppm; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

    ValueDefinition
    -2Above detection limit.
    NULLBlank (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:108
    Maximum:245
    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)

    ValueDefinition
    -1Below detection limit.
    -2Above detection limit.

    Range of values
    Minimum:0.01
    Maximum:49.6
    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)

    Range of values
    Minimum:0.1
    Maximum:10.55
    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)

    ValueDefinition
    -2Above detection limit.

    Range of values
    Minimum:0.7
    Maximum:9840
    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)

    Range of values
    Minimum:10
    Maximum:3590
    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)

    Range of values
    Minimum:0.06
    Maximum:20.4
    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)

    Range of values
    Minimum:0.01
    Maximum:282
    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)

    Range of values
    Minimum:0.01
    Maximum:17.85
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.02
    Maximum:72.3
    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)

    Range of values
    Minimum:0.78
    Maximum:377
    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)

    Range of values
    Minimum:0.2
    Maximum:68.3
    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)

    Range of values
    Minimum:5
    Maximum:136
    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)

    Range of values
    Minimum:0.05
    Maximum:36.8
    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)

    Range of values
    Minimum:1.3
    Maximum:1070
    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)

    Range of values
    Minimum:0.56
    Maximum:42.1
    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)

    Range of values
    Minimum:0.36
    Maximum:44.5
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.05
    Maximum:0.61
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.1
    Maximum:4.6
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.005
    Maximum:6.51
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.006
    Maximum:11.1
    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)

    Range of values
    Minimum:0.02
    Maximum:4.94
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.5
    Maximum:168.5
    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)

    Range of values
    Minimum:0.8
    Maximum:213
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:2.88
    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)

    Range of values
    Minimum:31
    Maximum:9050
    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)

    Range of values
    Minimum:0.16
    Maximum:22.7
    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)

    Range of values
    Minimum:0.01
    Maximum:4.35
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.1
    Maximum:128.5
    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)

    Range of values
    Minimum:0.7
    Maximum:229
    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)

    Range of values
    Minimum:10
    Maximum:4760
    Units:parts per million

    Pb_pct_Pb-OG62
    Lead 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 = 20 pct; Detection limits indicate the minimum and maximum concentrations that can be accurately determined. (Source: ALS Geochemistry)

    ValueDefinition
    NULLBlank (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:1.085
    Maximum:1.085
    Units:percent

    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)

    ValueDefinition
    -2Above detection limit.

    Range of values
    Minimum:0.5
    Maximum:913
    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)

    Range of values
    Minimum:1.3
    Maximum:670
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.002
    Maximum:0.002
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.01
    Maximum:7.82
    Units:percent

    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)

    ValueDefinition
    -2Above detection limit.

    Range of values
    Minimum:0.19
    Maximum:4410
    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)

    Range of values
    Minimum:0.1
    Maximum:23.6
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:1
    Maximum:17
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.2
    Maximum:395
    Units:parts per million

    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)

    Range of values
    Minimum:1.7
    Maximum:766
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.06
    Maximum:11.8
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.05
    Maximum:6.74
    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 = 0.01 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:0.09
    Maximum:52.2
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.005
    Maximum:0.667
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.02
    Maximum:3.95
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.1
    Maximum:55.1
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:1
    Maximum:157
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.1
    Maximum:50.1
    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)

    Range of values
    Minimum:0.2
    Maximum:302
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:2
    Maximum:406
    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)

    ValueDefinition
    -1Below detection limit.

    Range of values
    Minimum:0.6
    Maximum:115.5
    Units:parts per million

    MAG_1
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.001
    Maximum:2
    Units:10^-3 SI

    MAG_2
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.007
    Maximum:1.8
    Units:10^-3 SI

    MAG_3
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.007
    Maximum:1.4
    Units:10^-3 SI

    MAG_4
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0
    Maximum:1.8
    Units:10^-3 SI

    MAG_5
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0
    Maximum:1.3
    Units:10^-3 SI

    MAG_6
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.011
    Maximum:1.6
    Units:10^-3 SI

    MAG_7
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.035
    Maximum:2.9
    Units:10^-3 SI

    MAG_8
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.02
    Maximum:1.4
    Units:10^-3 SI

    MAG_9
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.01
    Maximum:1.5
    Units:10^-3 SI

    MAG_10
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.23
    Maximum:0.7
    Units:10^-3 SI

    MAG_11
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.41
    Maximum:0.41
    Units:10^-3 SI

    MAG_12
    magnetic susceptibility (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLmagnetic susceptibility was not measured

    Range of values
    Minimum:0.53
    Maximum:0.53
    Units:10^-3 SI


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    We thank Fraser Tabeart (PolarX Ltd.), Phil St. George and Jack Cote (Millrock Resources Inc.), Mike Stoltz, and Lynn Armstrong for access to the Lone Tree (LT) and Wolf (WFL) drill core on the Uncle Sam property. The DGGS Richardson geologic mapping project was funded by the State of Alaska.

  3. 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 Richardson project area has produced approximately 122,000 ounces of gold (Singh and others, 2017), mostly from placer mines, and it includes the Richardson, Tower, and Hilltop lode 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.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 2018 (process 1 of 8)
    Field data collection - During the 2018 field season, geologists from the Alaska Division of Geological &amp; 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-5 and B-6 quadrangles.

    Date: 2018 (process 2 of 8)
    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. Rock outcrop accounts for much less than one percent of the study area, consequently, many of the rock samples were collected from up to 1-meter-deep pits dug with shovels into rocky colluvial deposits below the surficial loess.

    Date: 2018 (process 3 of 8)
    Magnetic susceptibility measurements - Magnetic susceptibility measurements were collected using Terraplus KT 5, 6, 9, and 10 model handheld magnetic susceptibility meters. The values reported here are for individual measurements performed on representative surfaces of the sampled rock outcrop.

    Date: 2018 (process 4 of 8)
    Sample preparation - Rock samples were processed by ALS Geochemistry using their PREP-31 package. The samples were crushed to greater than 70 percent passing 2 mm, and a 250 g split was pulverized to greater than 85 percent passing 75 microns. 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: 2018 (process 5 of 8)
    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); Hg values were analyzed by aqua regia digestion followed by ICP-MS (ALS Geochemistry method Hg-MS42).

    Date: 2018 (process 6 of 8)
    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). Au was analyzed using flux digestion and fire assay and ICP-AES (ALS Geochemistry method Au-ICP21).

    Date: 2018 (process 7 of 8)
    Samples that exceeded detection limits for elements of interest were reanalyzed using specific elemental tests. Over-limit values for Au were analyzed using 30-g fire assay with gravimetric finish (ALS Geochemistry method Au-GRA21). Overlimit values for Ag were analyzed by four-acid digestion followed by inductively-coupled plasma-atomic emission spectrometry (ALS Geochemistry method Ag-OG62) or by 30-g fire assay with gravimetric finish (ALS Geochemistry method Ag-GRA21). Overlimit values for Pb were analyzed by four-acid digestion followed by inductively-coupled plasma-atomic emission spectrometry (ALS Geochemistry method Pb-OG62).

    Date: 2018 (process 8 of 8)
    Sample archival - Samples collected during this project, as well as laboratory sample rejects and pulps, will be stored at DGGS for the duration of the project and will be available for public viewing upon request. Once the project concludes, the samples and pulps will be stored at the Alaska Geologic Materials Center in Anchorage.

  3. What similar or related data should the user be aware of?

    Staff, DGGS, Dighem, and WGM, Inc., 1995, 7200 Hz coplanar resistivity of the Richardson mining district: Report of Investigation RI 95-13, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Staff, DGGS, Dighem, and WGM, Inc., 1995, 900 Hz coplanar resistivity of the Richardson mining district: Report of Investigation RI 95-12, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Staff, DGGS, Dighem, and WGM, Inc., 1995, Total field magnetics and electromagnetic anomalies of the Richardson mining district: Report of Investigation RI 95-9, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Staff, DGGS, Dighem, and WGM, Inc., 1995, Total field magnetics of the Richardson mining district: Report of Investigation RI 95-10, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Naibert, T.J., Benowitz, J.A., Wypych, Alicja, Sicard, K.R., and Twelker, Evan, 2018, 40Ar/39Ar data from the Tanacross D-1 and D-2, Big Delta B-4 and B-5, and Mount Hayes A-6 quadrangles, Alaska: Raw Data File RDF 2018-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 15 p
    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:

    Other_Citation_Details: 4 p


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

  1. How well have the observations been checked?

    Samples were analyzed for a variety of suites of major and trace elements depending on the sample type. In addition to ALS Geochemistry' accredited (ISO/IEC 17025-2005) internal quality-control program, DGGS monitored analysis quality with at least one standard reference material per batch of 20 analyses.

  2. How accurate are the geographic locations?

    Location data were collected using GPS-enabled tablets (2017 Samsung Galaxy Tab A) running the ESRI Collector App. The devices have a reported error of about 10 m. Latitude and longitude are reported in the WGS84 datum.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This data release is complete.

  5. 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.

  1. 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
  2. What's the catalog number I need to order this data set?

    RDF 2018-6

  3. 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.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 16-Nov-2018
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:


Generated by mp version 2.9.21 on Fri Nov 16 11:28:09 2018