Geochemistry

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Title: Geochemistry
Abstract:
This geodatabase is a point data set that includes geochemical analyses from three major data sets, U.S. Geological Survey (USGS) Alaska Geochemical Database (AGDB2), National Uranium Resource Evaluation (NURE) database, and Alaska Division of Geological and Geophysical Surveys (ADGGS) geochemical database. Sample media include stream sediment, rock, mineral, heavy-mineral concentrate, and soil. For samples that have been analyzed by more than one method, only the determination by the 'best' method is given for each element. The ranking criteria used for determining 'best value' is described in detail in Granitto and others, 2013. Each feature class is also provided as a shapefile, and the associated geodatabase table is provided as a text file.
Supplemental_Information:
Granitto. M., Schmidt, J.M, Shew, N.B., Gamble, B.M., and Labay, K.A., 2013, Alaska Geochemical Database, version 2.0 (AGDB2) - including 'best value' data compilations for rock, sediment, soil, mineral, and concentrate sample media: U.S. Geological Survey Data Series 759, 20 p., and database, 1 DVD.
Hoffman, J.D., and Buttleman, Kim, 1996, National Geochemical Data Base: 1. National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) data for Alaska, formatted for GSSEARCH data base search software, 2. NURE HSSR data formatted as dBASE files for Alaska and the conterminous United States, 3. NURE HSSR data as originally compiled by the Department of Energy for Alaska and the conterminous United States, with MAPPER display software by R.A. Ambroziak and MAPPER documentation by C.A. Cook: U.S. Geological Survey Digital Data Series DDS-0018-B, CD-ROM.
Alaska Division of Geological and Geophysical Surveys (ADGGS) WebGeoChem geochemical sample analysis search -- http://www.dggs.alaska.gov/webgeochem/
  1. How might this data set be cited?
    U.S. Geological Survey, 2016, Geochemistry:.

    This is part of the following larger work.

    Susan M. Karl (ed.), James V. Jones, III (ed.), and Timothy S. Hayes (ed.), 2016, GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska: U.S. Geological Survey Open-File Report 2016-1191.

    Online Links:

    Other_Citation_Details:
    The larger work includes data sets for mineral resource data, geochemistry (stream sediment, rock, soil, mineral, and heavy mineral concentrate), igneous rock geochemical indices, aeroradiometric data, and hydrologic units analyzed for select deposit types.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: 173.1
    East_Bounding_Coordinate: -129.9
    North_Bounding_Coordinate: 71.6
    South_Bounding_Coordinate: 50.0
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2014Currentness_Reference: compilation date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector 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?
      The map projection used is NAD 1983 Alaska Albers.
      Projection parameters:
      Standard_Parallel: 55.0
      Standard_Parallel: 65.0
      Longitude_of_Central_Meridian: -154.0
      Latitude_of_Projection_Origin: 50.0
      False_Easting: 0.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    sample_info
    Point feature for each geochemical sample with descriptive information, including location, submitter and project, and geologic material description. (Source: this data set)
    AK_ID
    Character field providing a unique identifier for each sample. Each contributing data set had its own unique identifier. AK_ID is the key field for the compiled dataset. (Source: this data set) free text
    LAB_ID
    Unique identifier for USGS AGDB2 records. Character field. Null values present. (Source: AGDB2) free text
    NURE_REC_NO
    Unique identifier for NURE database records. Character field. Null values present. (Source: NURE) free text
    ADGGS_ID
    Unique identifier for ADGGS records. Character field. Null values present. (Source: ADGGS) free text
    FIELD_ID
    Field identification usually assigned by the sample collector. Character field. Null values present. (Source: AGDB2) free text
    JOB_ID
    Laboratory batch identifier assigned by the Sample Control Officer of the analytical laboratory receiving the samples. Null values present. (Source: AGDB2) free text
    SUBMITTER
    Name of the person(s) who submitted the sample to the laboratory; not necessarily the sample collector. Null values present. (Source: AGDB2) free text
    PROJECT_NAME
    Name of the research project that submitted the sample for analysis. Null values present. (Source: AGDB2) free text
    DATE_SUBMITTED
    Date sample was submitted to Sample Control for initial database processing prior to sample prep and analysis. Null values present. (Source: AGDB2)
    Range of values
    Minimum:7/1/1960
    Maximum:9/1/2014
    Units:Date field, mm/dd/yyyy
    DATE_COLLECT
    Date sample was collected. Null values present. (Source: AGDB2) free text
    COUNTRY
    The country or marine body of water from which the sample was collected. Null values present. (Source: AGDB2) free text
    STATE
    Abbreviation of the state from which the sample was collected. Null values present. (Source: AGDB2)
    ValueDefinition
    AKAlaska
    QUAD
    Name of the 1:250,000 scale quadrangle from which the sample was collected. (Source: AGDB2) Name of the 1:250,000 scale quadrangles.
    LATITUDE
    Latitude coordinate of sample site reported in decimal degrees; usually with NAD27 datum and Clark 1866 spheroid prior to year 2000. Resolution is variable. Null values present. (Source: AGDB2)
    Range of values
    Minimum:50.
    Maximum:71.6
    Units:decimal degrees
    LONGITUDE
    Longitude coordinate of sample site reported in decimal degrees, usually with NAD27 datum and Clark 1866 spheroid prior to year 2000. Resolution is variable. Null values present. (Source: AGDB2)
    Range of values
    Minimum:-179.18333
    Maximum:179.45
    Units:decimal degrees
    DATUM
    Reference datum for the latitude and longitude coordinates of the sample sites. Null values present. (Source: AGDB2) Reference datum
    SPHEROID
    Reference spheroid or ellipsoid for the latitude and longitude coordinates of the sample site. Null values present. (Source: AGDB2) Reference spheroids or ellipsoids
    LOCATE_DESC
    Geographic information relating to the location of the sample site. (Source: AGDB2) free text
    DEPTH
    Depth from the surface at which the sample was collected; units specified by the submitter. (Source: AGDB2) free text
    SAMPLE_SOURCE
    Physical setting or environment from which the sample was collected. (Source: AGDB2) free text
    METHOD_COLLECTED
    Sample collection method: grab/single, composite, or channel. Null values present. (Source: AGDB2) Either grab/single, composite, or channel. Null values present.
    PRIMARY_CLASS
    Primary classification of sample media. Null values present. (Source: AGDB2) Primary classifications of sample media: concentrate, mineral, rock, sediment, soil, or UNKNOWN.
    SECONDARY_CLASS
    Secondary classification or subclass of sample media; modifies PRIMARY_CLASS. Null values present. (Source: AGDB2) Secondary classifications of sample media: igneous, metamorphic, sedimentary, panned, panned only, wiffley table, or unspecified.
    SPECIFIC_NAME
    Specific name for the sample media collected; attribute of PRIMARY_CLASS and/or SECONDARY_CLASS. Null values present. (Source: AGDB2) free text
    SAMPLE_COMMENT
    Additional descriptive information about the sample. Null values present. (Source: AGDB2) free text
    DESC1
    Additional descriptive information about the sample. Null values present. (Source: ADGGS) free text
    DESC2
    Additional descriptive information about the sample. Null values present. (Source: ADGGS) free text
    DESC3
    Additional descriptive information about the sample. Null values present. (Source: ADGGS) free text
    DESC4
    Additional descriptive information about the sample. Null values present. (Source: ADGGS) free text
    DESC5
    Additional descriptive information about the sample. Null values present. (Source: ADGGS) free text
    ADD_ATTR
    Additional attributes used to modify PRIMARY_CLASS, SECONDARY_CLASS, or SPECIFIC_NAME. Null values present. (Source: AGDB2) free text
    GEOLOGIC_AGE
    Geologic age or age range provided by the submitter at the time the sample was submitted. Null values present. (Source: AGDB2) free text
    STRATIGRAPHY
    Name of the stratigraphic unit from which the sample was collected. Entry provided by sample submitter and may represent a formal name, informal name, or geologic map unit. Null values present. (Source: AGDB2) free text
    MINERALIZATION
    An indication of mineralization as provided by the sample submitter. (Source: AGDB2) free text
    ALTERATION
    Comment on presence of alteration as noted by the sample submitter. Null values present. (Source: AGDB2) free text
    IGNEOUS_FORM
    A description of igneous setting from which the sample was collected as provided by the sample submitter. Null values present. (Source: AGDB2) free text
    METAMORPHISM
    A description of metamorphism of the sample as provided by the sample submitter. Null values present. (Source: AGDB2) free text
    FACIES_GRADE
    Metamorphic facies or grade as provided by the sample submitter. Null values present. (Source: AGDB2) free text
    SOURCE_ROCK
    Descriptive information about the source rock, or protolith. Null values present. (Source: AGDB2) free text
    DEPOSIT_ENVIRON
    Original environment of deposition for sedimentary rock sample. Null values present. (Source: AGDB2) free text
    SAMPLE_ZONE
    Soil horizon from which soil sample was collected. Null values present. (Source: AGDB2) free text
    HORIZON
    A description of soil horizon from which the soil sample was collected. Null values present. (Source: AGDB2) free text
    SALINE
    A description of the saline nature of the soil from which the soil sample was collected. Null values present. (Source: AGDB2) free text
    ORGANICS
    Organic content of soil from which the soil sample was collected. Null values present. (Source: AGDB2) free text
    FERRITIC
    A description of ferritic nature of the soil from which the soil sample was collected. Null values present. (Source: AGDB2) free text
    DRAINAGE
    A description of the soil drainage where the soil sample was collected. Null values present. (Source: AGDB2) free text
    PREP
    Description of the sample preparation methods used. (Source: AGDB2) free text
    MESH_PORE_SIZE
    Sieve size used in field sampling or laboratory preparation to fractionate the sample. Null values present. (Source: AGDB2) free text
    LAT_NAD27
    Latitude coordinate of sample site in NAD27 datum as transformed from fields LATITUDE and DATUM. Null values present. (Source: this data set)
    Range of values
    Minimum:50.
    Maximum:71.6
    Units:decimal degrees
    LONG_NAD27
    Longitude coordinate of sample site in NAD27 datum as transformed from fields LATITUDE and DATUM. Null values present. (Source: this data set)
    Range of values
    Minimum:-179.18333
    Maximum:179.45
    Units:decimal degrees
    HMC_BV
    Best value geochemical data for heavy mineral concentrates. The following list of Attribute_Labels also pertain to feature classes mineral/mnrl_BV, rock/rock_BV, seds/sed_BV, and soil/soil_BV. (Source: this data set)
    AK_ID
    Unique identifier for each sample. Use AK_ID to join with feature class sample_info. (Source: this data set) free text
    LAB_ID
    Unique identifier for USGS AGDB2 records. Character field. Null values present. (Source: AGDB2) free text
    NURE_REC_NO
    Unique identifier for NURE database records. Character field. Null values present. (Source: NURE) free text
    ADGGS_ID
    Unique identifier for ADGGS records. Character field. Null values present. (Source: this data set) free text
    LATITUDE
    Latitude coordinate of sample site reported in decimal degrees; usually with NAD27 and Clark 1866 spheroid prior to year 2000. Resolution is variable. Null values present. (Source: AGDB2)
    Range of values
    Minimum:52.16667
    Maximum:71.04194
    Units:decimal degrees
    LONGITUDE
    Longitude coordinate of sample site reported in decimal degrees, usually with NAD27 datum and Clark 1866 spheroid prior to year 2000. Resolution is variable. Null values present. (Source: AGDB2)
    Range of values
    Minimum:-174.58333
    Maximum:-130.0375
    Units:decimal degrees
    DATUM
    Reference datum for the latitude and longitude coordinates of the sample sites. Null values present. (Source: AGDB2) Reference datum
    PRIMARY_CLASS
    Primary classification of sample media. (Source: AGDB2) Primary classification for heavy mineral concentrate samples is concentrate.
    SECONDARY_CLASS
    Secondary classification or subclass of sample media; modifies PRIMARY_CLASS. Null values present. (Source: AGDB2) Secondary classifications of heavy mineral concentrate samples are: panned, panned only, wiffley table, or unspecified.
    Ag_ppm
    Silver, as 'best value', in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less that the detection limit of the analytical method, and the absolute value is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:600000
    Units:parts per million by weight
    Ag_ppm_AM
    Abbreviation for analytical method used for 'best value' of silver determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Al_pct
    Aluminum, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:81.562
    Units:weight percent
    Al_pct_AM
    Abbreviation for analytical method used for 'best value' of aluminum determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    As_ppm
    Arsenic, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:320000
    Units:parts per million by weight
    As_ppm_AM
    Abbreviation for analytical method used for 'best value' arsenic determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Au_ppm
    Gold, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:100000.11111
    Units:parts per million by weight
    Au_ppm_AM
    Abbreviation for analytical method used for 'best value' gold determination. (Source: AGDB2) See table AnalyticMethod for attribute determination
    B_ppm
    Boron, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:20000.11111
    Units:parts per million by weight
    B_ppm_AM
    Abbreviation for analytical method used for 'best value' boron determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ba_ppm
    Barium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:600000
    Units:parts per million by weight
    Ba_ppm_AM
    Abbreviation for analytical method used for 'best value' barium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Be_ppm
    Beryllium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:20000
    Units:parts per million by weight
    Be_ppm_AM
    Abbreviation for analytical method used for 'best value' beryllium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Bi_ppm
    Bismuth, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:250000
    Units:parts per million by weight
    Bi_ppm_AM
    Abbreviation for analytical method used for 'best value' bismuth determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Br_ppm
    Bromine, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:119
    Units:parts per million by weight
    Br_ppm_AM
    Abbreviation for analytical method used for 'best value' bromine determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ca_pct
    Calcium, as 'best value', in weight percent. Values ending in 0.00111, 0.01111, or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:60.11111
    Units:weight percent
    Ca_pct_AM
    Abbreviation for analytical method used for 'best value' calcium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Cd_ppm
    Cadmium, as 'best value', in parts per million by weight. Values ending 0.00111, 0.01111, or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:10400
    Units:parts per million by weight
    Cd_ppm_AM
    Abbreviation for analytical method used for 'best value' cadmium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ce_ppm
    Cerium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:210000
    Units:parts per million by weight
    Ce_ppm_AM
    Abbreviation for analytical method used for 'best value' cerium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Cl_pct
    Chlorine, as "best value", in weight percent. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:10.22
    Units:weight percent
    Cl_pct_AM
    Abbreviation for the analytical method used for 'best value' chlorine determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Co_ppm
    Cobalt, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:250000
    Units:parts per million by weight
    Co_ppm_AM
    Abbreviation for analytical method used for 'best value' cobalt determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Cr_ppm
    Chromium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:462000
    Units:parts per million by weight
    Cr_ppm_AM
    Abbreviation for analytical method used for 'best value' chromium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Cs_ppm
    Cesium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:1110
    Units:parts per million by weight
    Cs_ppm_AM
    Abbreviation for analytical method used for 'best value' cesium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Cu_ppm
    Copper, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:400000.11111
    Units:parts per million by weight
    Cu_ppm_AM
    Abbreviation for analytical method used for 'best value' copper determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Dy_ppm
    Dysprosium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:69700
    Units:parts per million by weight
    Dy_ppm_AM
    Abbreviation for analytical method used for 'best value' dysprosium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Er_ppm
    Erbium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:76100
    Units:parts per million by weight
    Er_ppm_AM
    Abbreviation for analytical method used for 'best value' erbium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Eu_ppm
    Europium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:6910
    Units:parts per million by weight
    Eu_ppm_AM
    Abbreviation for analytical method used for 'best value' europium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    F_pct
    Fluorine, as "best value", in weight percent. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:38.5
    Units:weight percent
    F_pct_AM
    Abbreviation for analytical method used for 'best value' fluorine determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Fe_pct
    Iron, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:72
    Units:weight percent
    Fe_pct_AM
    Abbreviation for analytical method used for 'best value' iron determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Fe2_pct
    Ferrous iron, as "best value", in weight percent. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:6.53
    Units:weight percent
    Fe2_pct_AM
    Abbreviation for analytical method used for 'best value' ferrous iron determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ga_ppm
    Gallium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:1500
    Units:parts per million by weight
    Ga_ppm_AM
    Abbreviation for analytical method used for 'best value' gallium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Gd_ppm
    Gadolinium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:43400
    Units:parts per million by weight
    Gd_ppm_AM
    Abbreviation for analytical method used for 'best value' gadolinium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ge_ppm
    Germanium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:500
    Units:parts per million by weight
    Ge_ppm_AM
    Abbreviation for analytical method used for 'best value' germanium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Hf_ppm
    Hafnium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:7000
    Units:parts per million by weight
    Hf_ppm_AM
    Abbreviation for analytical method used for 'best value' hafnium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Hg_ppm
    Mercury, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:742000
    Units:parts per million by weight
    Hg_ppm_AM
    Abbreviation for analytical method used for 'best value' mercury determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    HM_ppm
    Heavy metals, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:-9999
    Units:parts per million by weight
    HM_ppm_AM
    Abbreviation for analytical method used for 'best value' heavy metals determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ho_ppm
    Holmium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:19200
    Units:parts per million by weight
    Ho_ppm_AM
    Abbreviation for analytical method used for 'best value' holmium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    I_ppm
    Iodine, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:0.964
    Units:parts per million by weight
    I_ppm_AM
    Abbreviation for analytical method used for 'best value' iodine determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    In_ppm
    Indium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:300
    Units:parts per million by weight
    In_ppm_AM
    Abbreviation of analytical method used for 'best value' indium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ir_ppm
    Iridium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:6
    Units:parts per million by weight
    Ir_ppm_AM
    Abbreviation for analytical method used for 'best value' iridium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    K_pct
    Potassium, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:13.9
    Units:weight percent
    K_pct_AM
    Abbreviation for analytical method used for 'best value' potassium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    La_ppm
    Lanthanum, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:180000
    Units:parts per million by weight
    La_ppm_AM
    Abbreviation for analytical method used for 'best value' lanthanum determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Li_ppm
    Lithium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:5110
    Units:parts per million by weight
    Li_ppm_AM
    Abbreviation for analytical method used for 'best value' lithium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Lu_ppm
    Lutetium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:15800
    Units:parts per million by weight
    Lu_ppm_AM
    Abbreviation for analytical method used for 'best value' lutetium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Mg_pct
    Magnesium, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:41
    Units:weight percent
    Mg_pct_AM
    Abbreviation for analytical method used for 'best value' magnesium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Mn_pct
    Manganese, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:19.4
    Units:weight percent
    Mn_pct_AM
    Abbreviation for analytical method used for 'best value' for manganese determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Mo_ppm
    Molybdenum, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:37200
    Units:parts per million by weight
    Mo_ppm_AM
    Abbreviation for analytical method used for 'best value' molybdenum determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Na_pct
    Sodium, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:97.9
    Units:weight percent
    Na_pct_AM
    Abbreviation for analytical method used for 'best value' sodium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Nb_ppm
    Niobium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:67300
    Units:parts per million by weight
    Nb_ppm_AM
    Abbreviation for analytical method used for 'best value' niobium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Nd_ppm
    Neodymium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:128000
    Units:parts per million by weight
    Nd_ppm_AM
    Abbreviation for analytical method used for 'best value' neodymium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ni_ppm
    Nickel, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:100000.1111
    Units:parts per million by weight
    Ni_ppm_AM
    Abbreviation for analytical method used for 'best value' nickel determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Os_ppm
    Osmium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:3
    Units:parts per million by weight
    Os_ppm_AM
    Abbreviation for analytical method used for 'best value' osmium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    P_pct
    Phosphorus, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:20.11111
    Units:weight percent
    P_pct_AM
    Abbreviation for analytical method used for 'best value' phosphorus determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Pb_ppm
    Lead, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:550000
    Units:parts per million by weight
    Pb_ppm_AM
    Abbreviation for analytical method used for 'best value' lead determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Pd_ppm
    Palladium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:250000
    Units:parts per million by weight
    Pd_ppm_AM
    Abbreviation for analytical method used for 'best value' palladium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Pr_ppm
    Praseodymium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:24400
    Units:parts per million by weight
    Pr_ppm_AM
    Abbreviation for analytical method used for 'best value' praseodymium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Pt_ppm
    Platinum, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:250000
    Units:parts per million by weight
    Pt_ppm_AM
    Abbreviation for analytical method used for 'best value' platinum determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Rb_ppm
    Rubidium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:10000.11111
    Units:parts per million by weight
    Rb_ppm_AM
    Abbreviation for analytical method used for 'best value rubidium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Re_ppm
    Rhenium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:0.725
    Units:parts per million by weight
    Re_ppm_AM
    Abbreviation for analytical method used for 'best value' rhenium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Rh_ppm
    Rhodium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:2
    Units:parts per million by weight
    Rh_ppm_AM
    Abbreviation for analytical method used for 'best value' rhodium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ru_ppm
    Ruthenium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:4
    Units:parts per million by weight
    Ru_ppm_AM
    Abreviation for analytical method used for 'best value' ruthenium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    S_pct
    Total sulfur, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:52
    Units:weight percent
    S_pct_AM
    Abbreviation for analytical method used for 'best value' total sulfur determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Sb_ppm
    Antimony, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:640000
    Units:parts per million by weight
    Sb_ppm_AM
    Abbreviation for analytical method used for 'best value' antimony determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Sc_ppm
    Scandium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:1930
    Units:parts per million by weight
    Sc_ppm_AM
    Abbreviation for analytical method used for 'best value' scandium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Se_ppm
    Selenium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:990
    Units:parts per million by weight
    Se_ppm_AM
    Abbreviation for analytical method used for 'best value' selenium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Si_pct
    Silicon, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:99.11111
    Units:weight percent
    Si_pct_AM
    Abbreviation for analytical method used for 'best value' silicon determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Sm_ppm
    Samarium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:48400
    Units:parts per million by weight
    Sm_ppm_AM
    Abbreviation for analytical method used for 'best value' samarium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Sn_ppm
    Tin, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:512000
    Units:parts per million by weight
    Sn_ppm_AM
    Abbreviation for analytical method used for 'best value' tin determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    SplWtAu_g
    Gold method sample weight, as "best value", in grams. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:-9999
    Units:grams
    SplWtAu_g_AM
    Abbreviation for analytical method used for 'best value gold method sample weight determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    SplWtFA_g
    Fire assay sample weight, as "best value", in grams. Value -9999 means not analyzed. (Source: Fire assay sample weight, as "best value", in grams. Value -9999 means not analyzed.)
    Range of values
    Minimum:-9999
    Maximum:-9999
    Units:grams
    SplWtFA_g_AM
    Abreviation for analytical method used for 'best value' fire assay sample weight determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Sr_ppm
    Strontium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:47000
    Units:parts per million by weight
    Sr_ppm_AM
    Abbreviation for analytical method used for 'best value' strontium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ta_ppm
    Tantalum, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:10000.11111
    Units:parts per million by weight
    Ta_ppm_AM
    Abbreviation for analytical method used for 'best value' tantalum determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Tb_ppm
    Terbium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:8690
    Units:parts per million by weight
    Tb_ppm_AM
    Abbreviation for nalytical method used for 'best value' terbium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Te_ppm
    Tellurium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-10000
    Maximum:50000
    Units:parts per million by weight
    Te_ppm_AM
    Abbreviation for analytical method used for 'best value' tellurium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Th_ppm
    Thorium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:160000
    Units:parts per million by weight
    Th_ppm_AM
    Abbreviation for analytical method used for 'best value' thorium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Ti_pct
    Titanium, as "best value", in weight percent. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:20.11111
    Units:weight percent
    Ti_pct_AM
    Abbreviation for analytical method used for 'best value' titanium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    TiO2_pct
    TiO2 calculated from Ti_pct by multiplying Ti_pct x 1.6681. Value 0 means sample not analyzed for titanium. (Source: AGDB2)
    Range of values
    Minimum:0
    Maximum:20.0172
    Units:weight percent
    Tl_ppm
    Thallium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:1000
    Units:parts per million by weight
    Tl_ppm_AM
    Abbreviation for analytical method used for 'best value' thallium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Tm_ppm
    Thulium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:17500
    Units:parts per million by weight
    Tm_ppm_AM
    Abbreviation for analytical method used for 'best value' thulium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    U_ppm
    Uranium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:117000
    Units:parts per million by weight
    U_ppm_AM
    Abbreviation for analytical method used for 'best value' uranium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    V_ppm
    Vanadium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:10000.11111
    Units:parts per million by weight
    V_ppm_AM
    Abbreviation for analytical method used for 'best value' vanadium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    W_ppm
    Tungsten, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:250000
    Units:parts per million by weight
    W_ppm_AM
    Abbreviation for analytical method used for 'best value' tungsten determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Y_ppm
    Yttrium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:400000
    Units:parts per million by weight
    Y_ppm_AM
    Abbreviation for analytical method used for 'best value' yttrium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Yb_ppm
    Ytterbium, as "best value", in parts per million by weight. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:61500
    Units:parts per million by weight
    Yb_ppm_AM
    Abbreviation for analytical method used for 'best value' ytterbium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Zn_ppm
    Zinc, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:842000
    Units:parts per million by weight
    Zn_ppm_AM
    Abbreviation for analytical method used for 'best value' zinc determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    Zr_ppm
    Zirconium, as "best value", in parts per million by weight. Values ending in 0.00111, 0.01111 or 0.11111 indicate that the element was measured at a concentration greater than the upper limit of determination for the analytical method. Negative values indicate determinations less than the detection limit of the analytical method. The absolute value of the negative number is the detection limit. Value -9999 means not analyzed. (Source: AGDB2)
    Range of values
    Minimum:-9999
    Maximum:250000
    Units:parts per million by weight
    Zr_ppm_AM
    Abbreviation for analytical method used for 'best value' zirconium determination. (Source: AGDB2) See table AnalyticMethod for attribute definition.
    HMC_mnrlgy
    Optical mineralogy data for non-magnetic heavy mineral concentrate samples. (Source: this data set)
    AK_ID
    Unique identifier for each sample. Use AK_ID to join with feature class sample_info. (Source: this data set) free text
    LAB_ID
    Unique identifier for USGS AGDB2 records. Character field. Null values present. (Source: AGDB2) free text
    NURE_REC_NO
    Unique identifier for NURE database records. Character field. Null values present. (Source: NURE) free text
    ADGGS_ID
    Unique identifier for ADGGS records. Character field. Null values present. (Source: ADGGS) free text
    LATITUDE
    Latitude coordinate of sample site reported in decimal degrees; usually with NAD27 and Clark 1866 spheroid to year 2000. Resolution is variable. Null values present. (Source: AGDB2)
    Range of values
    Minimum:54.66667
    Maximum:68.99333
    Units:decimal degrees
    LONGITUDE
    Longitude coordinate of sample site reported in decimal degrees; usually with NAD27 and Clark 1866 spheroid to year 2000. Resolution is variable. Null values present. (Source: AGDB2)
    Range of values
    Minimum:-163.59806
    Maximum:-131.93472
    Units:decimal degrees
    DATUM
    Reference datum for the latitude and longitude coordinates of the sample. (Source: AGDB2) Reference datum
    PRIMARY_CLASS
    Primary classification of sample media. (Source: AGDB2) Primary classifications of sample media: concentrate or sediment.
    SECONDARY_CLASS
    Secondary classification or subclass of sample media; modifies PRIMARY_CLASS. Null values present. (Source: AGDB2) Secondary classifications of sample media: panned or unspecified.
    ARS
    Presence or relative abundance of arsenopyrite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, moderate, present, trace, or an estimate of abundance in percent.
    AU
    Presence or relative abundance of gold observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, present, trace, or an estimate of abundance in percent.
    BAR
    Presence or relative abundance of barite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, moderate, present, trace, or an estimate of abundance in percent.
    CAS
    Presence or relative abundance of cassiterite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, present, trace, or an estimate of abundance in percent.
    CIN
    Presence or relative abundance of cinnabar observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, minor, moderate, present, trace, or an estimate of abundance in percent.
    CPY
    Presence or relative abundance of chalcopyrite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, present, trace, or an estimate of abundance in percent.
    FLR
    Presence or relative abundance of fluorite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, moderate, present, or an estimate of abundance in percent.
    GAL
    Presence or relative abundance of galena observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, moderate, present, trace, or an estimate of abundance in percent.
    MLY
    Presence or relative abundance of molybdenite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: present or an estimate of abundance in percent.
    MNZ
    Presence or relative abundance of monazite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, moderate, present, trace, or an estimate of abundance in percent.
    MNZ_dk
    Presence or relative abundance of dark variety of monazite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, moderate, present, or an estimate of abundance in percent.
    MNZ_yel
    Presence or relative abundance of yellow variety monazite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: major, minor, or present.
    POW
    Presence or relative abundance of powellite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, present, trace, or an estimate of abundance in percent.
    PYR
    Presence or relative abundance of pyrite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, minor, moderate, present, trace, or an estimate of abundance in percent.
    SCH
    Presence or relative abundance of scheelite observed in non-magnetic heavy mineral concentration sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, moderate, present, trace, or an estimate of abundance in percent.
    SPH
    Presence or relative abundance of sphalerite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, inferred, moderate, present, trace, or an estimate of abundance in percent.
    STB
    Presence or relative abundance of stibnite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: inferred, present, or an estimate of abundance in percent.
    THR
    Presence or relative abundance of thorite observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) Observed amount present: abundant, present, or an estimate of abundance in percent.
    NORM
    Abbreviation for 'no ore related minerals found' in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) NORM - no ore related minerals found
    OreRelatedMnrl_Comment
    Comments regarding ore or gem related minerals observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) free text
    RockFormingMnrl_Comment
    Comments regarding rock-forming minerals observed in non-magnetic heavy mineral concentrate sample. Null values present. (Source: AGDB2) free text
    Optical_Comment
    General comments. (Source: AGDB2) free text
    Inferred_Comment
    Comment based on chemical analyses and geologic mapping. (Source: AGDB2) free text
    mnrl_BV
    Best value chemical data for mineral samples. See entity_type HMC_BV for attribute definitions. (Source: this data set)
    rock_BV
    Best value chemical data for rock samples. See entity_type HMC_BV for attribute definitions. (Source: this data set)
    sed_BV
    Best value chemical data for stream sediment samples. See entity_type HMC_BV for attribute definitions. (Source: this data set)
    soil_BV
    Best value chemical data for soil samples. See entity_type HMC_BV for attribute definitions. (Source: this data set)
    AnalyticMethod
    Table of analytical methods with brief description and digestion method. (Source: ADGB2)

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?
    Matt Granitto, USGS
  3. To whom should users address questions about the data?

Why was the data set created?

The geochemistry data layers were created to provide geochemical analyses to aid in estimating the potential and certainty of various mineral deposit models in the state of Alaska.

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: 2015 (process 1 of 1)
    This geochemistry database is a compilation of three geochemical databases with statewide distribution of geologic materials. Each of the three contributing datasets has its own file structure and data format. In order to produce a single dataset, the original datasets needed to be reformatted for consistency, statistical analyses, and mapping.
    Each original dataset had a unique identifier, LAB_ID for AGDB2, NURE_REC_NO for the NURE database, and ADGGS_ID for the samples provided by Alaska Division of Geological and Geophysical Surveys, ADGGS. The ADGGS data is available for downloaded from the ADGGS WebGeoChem website, http://www.dggs.alaska.gov/webgeochem. Attribute AK_ID is a unique identifier created for this compilation data set.
    For samples that may have had an element analyzed by more than one analytical method, only the 'best value' is provided. See Granitto and others, 2013 for description of how 'best value' is determined.
    The original location information was provided in several datums or geodetic systems. The point feature class is presented in Alaska Albers NAD 83, however the original latitude, longitude, and datum are listed in the feature attribute table. Datum NAD 27 was assumed for samples for which the datum was not available. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Matt Granitto
    Box 25046, Denver Federal Center, MS 973
    Lakewood, CO
    U.S.A.

    303-236-1412 (voice)
    granitto@usgs.gov
  3. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?
    The data in this dataset represent the analyses of geologic material collected by several agencies for various projects with differing analytical needs. The data was also collected and analyzed over a period of more that 50 years, and during that time analytical methods have changed. Some samples were analyzed for a specific element in multiple ways. This dataset provides the 'best value' as determined by a method described in Granitto and others, 2013.
    In order to maintain the analyses in numeric fields suitable for calculations, a few numeric codes were used. The value -9999 is used when that particular element was not analyzed. Other negative values mean that the element was detected but at a level below the lower limit of the analytical method and the lower limit is the absolute value of the value listed. Values with repeating '1's after the decimal represent measurements above the upper detection limit for the analytical method.
  2. How accurate are the geographic locations?
    Users must be aware that the locational accuracy is an unknown factor because of background of each contributing dataset. Resolution is variable and range from 5 digit GPS precision to the corner of the topographic base map. We present the location information as we received it in the attribute fields LATITUDE, LONGITUDE, and DATUM.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Not all samples were analyzed for each element or by the same analytical method. The analytical method used was selected by the sample submitter based on the goals of his/her project. More detailed descriptions of the AGDB2, analytical methods, and sample preparation protocols are provided in Granitto and others, 2013.
    Not all fields from the original datasets are presented here. Users may find additional information by researching the original datasets.
  5. How consistent are the relationships among the observations, including topology?
    Each of the original contributing datasets had its own data structure and criteria. As a combined single dataset, field AK_ID is the unique field. Data from USGS has unique identifier LAB_ID, data from NURE has NURE_REC_NO, and data from ADGGS has ADGGS_ID.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
None. Users are advised to read the metadata for the dataset thoroughly to understand appropriate use and data limitations.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    MS902
    Box 25286
    Denver Federal Center
    Lakewood, CO
    U.S.A.

    1-888-ASK-USGS (voice)
  2. What's the catalog number I need to order this data set? USGS Open-File Report 2016-1191
  3. What legal disclaimers am I supposed to read?
    This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 29-Dec-2015
Last Reviewed: 06-Sep-2016
Metadata author:
U.S. Geological Survey
Attn: Nora Shew
4210 University Drive
Anchorage, AK
U.S.A.

907-786-7445 (voice)
nshew@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.34 on Fri Nov 4 13:24:43 2016