Scored_HUCs.gdb

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Title: Scored_HUCs.gdb
Abstract:
Polygon feature classes depicting the identification of mineral resource potential for six different deposit models across the state of Alaska using subwatersheds (12-digit HUCs) as analysis cells. Each polygon feature class is also provided as a shapefile.
Supplemental_Information:
The Watershed Boundary Dataset (WBD) is available from url nhd.usgs.gov/wbd.html
  1. How might this data set be cited?
    U.S. Geological Survey, 2016, Scored_HUCs.gdb:.

    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: 172.4
    East_Bounding_Coordinate: -129.9
    North_Bounding_Coordinate: 71.4
    South_Bounding_Coordinate: 51.2
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2016Currentness_Reference: publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (17177)
    2. What coordinate system is used to represent geographic features?
      The map projection used is NAD 1983 Alaska Albers (ESRI Full Name: 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 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in Meter
      The horizontal datum used is D_North_American_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?
    CuCarb_hucs_state
    HUC scoring for the carbonate-hosted Cu deposits model based on criteria described in accompanying report. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: Watershed Boundary Dataset) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.
    SED_SCORE
    Points scored from Cu_ppm in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    SEDTR_SCORE
    Points scored from trace element data in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_TRACE_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    ARDF_SCORE
    Points scored from a keyword search on the Alaska Resource Data File (ARDF). Scoring parameters are described in the accompanying report. A null value signifies no ARDF sites are present the HUC. A value of 0 signifies that an ARDF site was found within the HUC, but the keyword score is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    MIN_SCORE
    Points scored from presence of certain minerals in the heavy mineral concentrate mineralogy data, Geochemistry.gdb/HMC/HMC_mnrlgy. Scoring parameters are described in the accompanying report. A null value signifies that no heavy mineral concentrate mineralogy data is in the HUC. A value of 0 signifies that data is found within the HUC, but the minerals of interest were not found. Alias field name MINERAL_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    RCK_SCORE
    Points scored from Cu_ppm in sedimentary or metamorphic rocks in the rock geochemistry dataset, Geochemistry.gdb/rock/rock_BV. Scoring parameters are described in the accompanying report. A null value signifies that no sedimentary or metamorphic rock samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name ROCK_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    RCKTR_SCORE
    Points scored from trace elements in sedimentary or metamorphic rocks in the rock geochemistry dataset, Geochemistry.gdb/rock/rock_BV. Scoring parameters are described in the accompanying report. A null value signifies that no sedimentary or metamorphic rock samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name ROCK_TRACE_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    LITH_SCORE
    Points scored from presence of carbonate rock on the state geologic map. Data layers are in Lithology.gdb/CuCarb. Scoring parameters are described in the accompanying report. The value 0 signifies that carbonate rocks are not mapped in the HUC. Alias field name LITHOLOGY_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:5
    TOTAL_SCORE
    Summation of SED_SCORE, SEDTR_SCORE, ARDF_SCORE, MIN_SCORE, RCK_SCORE, RCKTR_SCORE, and LITH_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:14
    SED_PCT
    The calculated percentage of SED_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_PCT. SED_PCT is null if SED_SCORE is null or if SED_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    SEDTR_PCT
    The calculated percentage of SEDTR_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_TRACE_PCT. SEDTR_PCT is null if SEDTR_SCORE is null or if SEDTR_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    ARDF_PCT
    The calculated percentage of ARDF_SCORE of the TOTAL_SCORE. ARDF_PCT is null if ARDF_SCORE is null or if ARDF_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    MIN_PCT
    The calculated percentage of MIN_SCORE of the TOTAL_SCORE. Alias field name MINERAL_PCT. MIN_PCT is null if MIN_SCORE is null or if MIN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    RCK_PCT
    The calculated percentage of RCK_SCORE of the TOTAL_SCORE. Alias field name ROCK_PCT. RCK_PCT is null if RCK_SCORE is null or if RCK_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    RCKTR_PCT
    The calculated percentage of RCKTR_SCORE of the TOTAL_SCORE. Alias field name ROCK_TRACE_PCT. RCKTR_PCT is null if RCKTR_SCORE is null or if RCKTR_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    LITH_PCT
    The calculated percentage of LITH_SCORE of the TOTAL_SCORE. Alias field name LITHOLOGY_PCT. LITH_PCT is null if LITH_SCORE is null or if LITH_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    POTENTIAL
    Estimation of relative potential for carbonate-hosted Cu deposits based on TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHTOTAL_SCORE >= 8
    MEDTOTAL_SCORE >4 and <=7
    LOWTOTAL_SCORE >0 and <= 4, or if TOTAL_SCORE = 0 and sediment data is present in HUC.
    UNKNOWNTOTAL_SCORE = 0 and no sediment data is present in HUC.
    CERTAINTY
    Relative certainty of the potential ranking for carbonate-hosted Cu deposits based on number of data sets contributing (score is not null) to the TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGH6 or 7 datasets contribute to TOTAL_SCORE, or if TOTAL_SCORE = 0 and sediment data is present.
    MED4 or 5 datasets contribute to TOTAL_SCORE
    LOW1 to 3 datasets contribute to TOTAL_SCORE
    UNKNOWNTOTAL_SCORE = 0 and there are no stream sediment geochemistry data points in the HUC
    SYMBOL
    Concatenation of fields POTENTIAL and CERTAINTY. This field is used to symbolize the map showing carbonate-hosted Cu (-Co-Ag-Ge-Ga) estimated resource potential. (Source: this data set)
    ValueDefinition
    HIGH,HIGHHigh potential with high certainty. Symbolize with dark red color.
    HIGH,MEDHigh potential with medium certainty. Symbolize with medium red color.
    HIGH,LOWHigh potential with low certainty. Symbolize with pale red color.
    MED,HIGHMedium potential with high certainty. Symbolize with dark yellow color.
    MED,MEDMedium potential with medium certainty. Symbolize with medium yellow color.
    MED,LOWMedium potential with low certainty. Symbolize with pale yellow color.
    LOW,HIGHLow potential with high certainty. Symbolize with dark green color.
    LOW,MEDLow potential with medium certainty. Symbolize with medium green color.
    LOW,LOWLow potential with low certainty. Symbolize with pale green color.
    UNKNOWNUnknown potential. Symbolized in gray color.
    PGE_hucs_state
    HUC scoring for the platinum-group elements (PGE) deposits model based on criteria described in accompanying report. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: this data set) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.
    SED_SCORE
    Points scored from elements in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical values are below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    ARDF_SCORE
    Points scored from the Alaska Resource Data File (ARDF). Scoring parameters are described in the accompanying report. A null value signifies no ARDF sites are present the HUC. A value of 0 signifies that an ARDF site is found within the HUC, but the keyword score is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    MIN_SCORE
    Points scored from presence of certain minerals in the heavy mineral concentrate mineralogy data, Geochemistry.gdb/HMC/HMC_mnrlgy. Scoring parameters are described in the accompanying report. A null value signifies that no heavy mineral concentrate mineralogy data is in the HUC. A value of 0 signifies that data is found within the HUC, but the minerals of interest were not found. Alias field name MINERAL_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    RCK_SCORE
    Points scored from elements in rocks in the rock geochemistry dataset, Geochemistry.gdb/rock/rock_BV. Scoring parameters are described in the accompanying report. A null value signifies that no rock samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name ROCK_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    HMC_SCORE
    Points scored from elements in heavy mineral concentrate geochemistry dataset, Geochemistry.gdb/HMC/HMC_BV. Scoring parameters are described in the accompanying report. A null value signifies that no samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical values is below the cutoff defined by the scoring parameters. Alias field name HEAVY_MIN_CONC_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    LITH_SCORE
    Points scored from presence of mafic and ultramafic (MUM) rocks on the state geologic map. Data layers are in Lithology.gdb/PGE. Scoring parameters are described in the accompanying report. The value 0 signifies that (MUM) rocks are not in the HUC. Alias field name LITHOLOGY_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    TOTAL_SCORE
    Summation of LITH_SCORE, RCK_SCORE, HMC_SCORE, SED_SCORE, MIN_SCORE, and ARDF_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:17
    SED_PCT
    The calculated percentage of SED_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_PCT. SED_PCT is null if SED_SCORE is null or if SED_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    ARDF_PCT
    The calculated percentage of ARDF_SCORE of the TOTAL_SCORE. ARDF_PCT is null if ARDF_SCORE is null or if ARDF_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    MIN_PCT
    The calculated percentage of MIN_SCORE of the TOTAL_SCORE. Alias field name MINERAL_PCT. MIN_PCT is null if MIN_SCORE is null or if MIN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    RCK_PCT
    The calculated percentage of RCK_SCORE of the TOTAL_SCORE. Alias field name ROCK_PCT. RCK_PCT is null if RCK_SCORE is null or if RCK_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    HMC_PCT
    The calculated percentage of HMC_SCORE of the TOTAL_SCORE. Alias field name HEAVY_MIN_CONC_PCT. HMC_PCT is null if HMC_SCORE is null or if HMC_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    LITH_PCT
    The calculated percentage of LITH_SCORE of the TOTAL_SCORE. Alias field name LITHOLOGY_PCT. LITH_PCT is null if LITH_SCORE is null or if LITH_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    POTENTIAL
    Estimation of relative potential for PGE deposits based on TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHARDF_SCORE >= 3 or TOTAL_SCORE > 4
    MEDTOTAL_SCORE = 3 or 4
    LOWTOTAL SCORE < 3 and presence of sediment sample in the HUC
    UNKNOWNNo sediment data in HUC and TOTAL_SCORE = 0, or no sediment data in HUC and LITH_PCT = 100
    CERTAINTY
    Relative certainty of the potential ranking for PGE deposits based on number of data sets contributing to the TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHThe criteria for certainty depends on potential. For HIGH potential, certainty is HIGH if ARDF score >= 3 or 6 datasets contribute to TOTAL_SCORE. For MEDIUM potential, certainty is HIGH if 5 or 6 datasets contribute to TOTAL_SCORE. For LOW potential, certainty is HIGH if 4 to 6 datasets contribute to TOTAL_SCORE.
    MEDThe criteria for certainty depends on potential. For HIGH potential, certainty is MEDIUM if 4 or 5 datasets contribute to TOTAL_SCORE. For MEDIUM potential, certainty is MEDIUM if 3 or 4 datasets contribute to TOTAL_SCORE. For LOW potential, certainty is MEDIUM if 3 datasets contribute to TOTAL_SCORE.
    LOWThe criteria for certainty depends on potential. For HIGH potential, certainty is LOW if 1 to 3 datasets contribute to TOTAL_SCORE. For MEDIUM or LOW potential, certainty is LOW if 1 or 2 datasets contribute to TOTAL_SCORE.
    UNKNOWNNo sediment data in HUC and TOTAL_SCORE = 0, or no sediment data in HUC and LITH_PCT = 100
    SYMBOL
    Concatenation of fields POTENTIAL and CERTAINTY. This field is used to symbolize the map showing PGE (-Co-Cr-Ni-Ti-V) estimated resource potential. (Source: this data set)
    ValueDefinition
    HIGH,HIGHHigh potential with high certainty. Symbolize with dark red color.
    HIGH,MEDHigh potential with medium certainty. Symbolize with medium red color.
    HIGH,LOWHigh potential with low certainty. Symbolize with pale red color.
    MED,HIGHMedium potential with high certainty. Symbolize with dark yellow color.
    MED,MEDMedium potential with medium certainty. Symbolize with medium yellow color.
    MED,LOWMedium potential with low certainty. Symbolize with pale yellow color.
    LOW,HIGHLow potential with high certainty. Symbolize with dark green color.
    LOW,MEDLow potential with medium certainty. Symbolize with medium green color.
    LOW,LOWLow potential with low certainty. Symbolize with pale green color.
    UNKNOWNUnknown potential. Symbolized in gray color.
    Placer_hucs_state
    HUC scoring for placer and paleoplacer Au deposits model based on criteria described in accompanying report. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: this data set) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.
    SED_SCORE
    Points scored from elements in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:8
    ARDF_SCORE
    Points scored from the Alaska Resource Data File (ARDF). Scoring parameters are described in the accompanying report. A null value signifies no ARDF sites are present the HUC. A value of 0 signifies that an ARDF site was found within the HUC, but the keyword score is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:20
    MIN_SCORE
    Points scored from presence of certain minerals in the heavy mineral concentrate mineralogy data, Geochemistry.gdb/HMC/HMC_mnrlgy. Scoring parameters are described in the accompanying report. A null value signifies that no heavy mineral concentrate mineralogy data is in the HUC. A value of 0 signifies that data is found within the HUC, bu the minerals of interest were not found. Alias field name MINERAL_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:10
    LITH_SCORE
    Points scored from presence of igneous rocks or certain surficial deposits on the state geologic map. Data layers are in Lithology.gdb/Placer. Scoring parameters are described in the accompanying report. The value 0 signifies that igneous rocks or certain surficial deposits are not in the HUC. Alias field name LITHOLOGY_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:8
    STREAM_SCORE
    Score based on downstream proximity to HUCs with HIGH or MEDIUM potential. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:6
    TOTAL_SCORE
    Summation of LITH_SCORE, MIN_SCORE, SED_SCORE, ARDF_SCORE, and STREAM_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:46
    SED_PCT
    The calculated percentage of SED_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_PCT. SED_PCT is null if SED_SCORE is null or if SED_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    ARDF_PCT
    The calculated percentage of ARDF_SCORE of the TOTAL_SCORE. ARDF_PCT is null if ARDF_SCORE is null or if ARDF_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    MIN_PCT
    The calculated percentage of MIN_SCORE of the TOTAL_SCORE. Alias field name MINERAL_PCT. MIN_PCT is null if MIN_SCORE is null or if MIN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    LITH_PCT
    The calculated percentage of LITH_SCORE of the TOTAL_SCORE. Alias field name LITHOLOGY_PCT. LITH_PCT is null if LITH_SCORE is null or if LITH_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    STREAM_PCT
    The calculated percentage of STREAM_SCORE of the TOTAL_SCORE. STREAM_PCT is null if STREAM_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    POTENTIAL
    Estimation of relative potential for placer and paleoplacer Au deposits based on TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHARDF_SCORE >= 12 or MINERAL_SCORE = 10 or TOTAL_SCORE >= 16
    MEDTOTAL_SCORE = 6 to 15 and ARDF_SCORE < 12 and MINERAL_SCORE < 10
    LOWTOTAL SCORE 1 to 5, or TOTAL_SCORE = 0 and SED_SCORE is not null.
    UNKNOWNTOTAL_SCORE = 0 and SED_SCORE is null
    CERTAINTY
    Relative certainty of the potential ranking for placer and paleoplacer Au deposits based on number of data sets contributing to the TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHThe criteria for certainty depends on potential. For HIGH potential, certainty is HIGH if ARDF score >= 18 or 5 datasets contribute to TOTAL_SCORE. For MEDIUM potential, certainty is HIGH if 5 datasets contribute to TOTAL_SCORE. For LOW potential, certainty is HIGH if 5 datasets contribute to TOTAL_SCORE, or if TOTAL_SCORE = 0 and SED_SCORE is not null.
    MEDThe criteria for certainty depends on potential. For HIGH potential, certainty is MEDIUM if ARDF_SCORE = 16 or 4 datasets contribute to TOTAL_SCORE. For MEDIUM potential, certainty is MEDIUM if ARDF_SCORE = 10 or 3 or 4 datasets contribute to TOTAL_SCORE. For LOW potential, certainty is MEDIUM if 3 or 4 datasets contribute to TOTAL_SCORE.
    LOWThe criteria for certainty depends on potential. For HIGH potential, certainty is LOW if ARDF score = 12 or 14, or 1 to 3 datasets contribute to TOTAL_SCORE. For MEDIUM or LOW potential, certainty is LOW if 1 or 2 datasets contribute to TOTAL_SCORE.
    UNKNOWNTOTAL_SCORE = 0 and SED_SCORE is null
    SYMBOL
    Concatenation of fields POTENTIAL and CERTAINTY. This field is used to symbolize the map showing Au (placer and paleoplacer) estimated resource potential. (Source: this data set)
    ValueDefinition
    HIGH,HIGHHigh potential with high certainty. Symbolize with dark red color.
    HIGH,MEDHigh potential with medium certainty. Symbolize with medium red color.
    HIGH,LOWHigh potential with low certainty. Symbolize with pale red color.
    MED,HIGHMedium potential with high certainty. Symbolize with dark yellow color.
    MED,MEDMedium potential with medium certainty. Symbolize with medium yellow color.
    MED,LOWMedium potential with low certainty. Symbolize with pale yellow color.
    LOW,HIGHLow potential with high certainty. Symbolize with dark green color.
    LOW,MEDLow potential with medium certainty. Symbolize with medium green color.
    LOW,LOWLow potential with low certainty. Symbolize with pale green color.
    UNKNOWNUnknown potential. Symbolized in gray color.
    REE_hucs_state
    HUC scoring for REE-Th-Y-Nb (-U-Zr) deposits model based on criteria described in accompanying report. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: this data set) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.
    SED_SCORE
    Points scored from elements in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:6
    ARDF_SCORE
    Points scored from the Alaska Resource Data File (ARDF). Scoring parameters are described in the accompanying report. A null value signifies no ARDF sites are present the HUC. A value of 0 signifies that an ARDF site is found within the HUC, but the deyword score is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    IGN_SCORE
    Points scored from igneous rock indices in rock_igneous.gdb/all_igneous_ratios. Scoring parameters are described in the accompanying report. A null value signifies absence of data in that HUC. A value of 0 signifies that data is found within the HUC, but values do not meet the scoring parameters. Alias field name IGNEOUS_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:4
    PAN_SCORE
    Points scored from heavy mineral concentrate geochemistry and presence of certain minerals in Geochemistry.gdb/HMC/HMC_BV and HMC_mnrlgy. Scoring parameters are described in the accompanying report. A null value signifies that neither heavy mineral concentrate geochemistry nor mineralogy data is present in the HUC. A value of 0 signifies that data is found within the HUC, but it does not meet the scoring parameters. Alias field name PAN_CONC_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:6
    LITH_SCORE
    Points scored from presence of granite suite rocks as a major component of the geologic unit on the state geologic map. Data layer is in Lithology.gdb/REE. Scoring parameter is described in the accompanying report. The value 0 signifies that granitic suite rocks as a major component in a geologic unit is not in the HUC. The value 1 signifies that granitic suite rocks as a major component is in the HUC. Alias field name LITHOLOGY_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:1
    AERORAD_SCORE
    Score based on Th/K ratio data in thorium_potassium_ratio.tif. A null value signifies areas of no data. A value of 0 signifies that data is found within the HUC, but the Th/K value is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    TOTAL_SCORE
    Summation of SED_SCORE, ARDF_SCORE, IGN_SCORE, PAN_SCORE, LITH_SCORE, and AERORAD_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:16
    SED_PCT
    The calculated percentage of SED_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_PCT. SED_PCT is null if SED_SCORE is null or if SED_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    ARDF_PCT
    The calculated percentage of ARDF_SCORE of the TOTAL_SCORE. ARDF_PCT is null if ARDF_SCORE is null or if ARDF_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    IGN_PCT
    The calculated percentage of IGN_SCORE of the TOTAL_SCORE. Alias field name IGNEOUS_PCT. IGN_PCT is null if IGN_SCORE is null or if IGN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    PAN_PCT
    The calculated percentage of PAN_SCORE of the TOTAL_SCORE. Alias field name PAN_CONC_PCT. PAN_PCT is null if PAN_SCORE is null or if PAN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    LITH_PCT
    The calculated percentage of LITH_SCORE of the TOTAL_SCORE. Alias field name LITHOLOGY_PCT. LITH_PCT is null if LITH_SCORE is null or if LITH_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    AERORAD_PCT
    The calculated percentage of AERORAD_SCORE of the TOTAL_SCORE. AERORAD_PCT is null if AERORAD_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    POTENTIAL
    Estimation of relative potential for REE deposits based on TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHTOTAL_SCORE >= 7
    MEDTOTAL_SCORE = 3 to 6
    LOWTOTAL SCORE is less than 3, or TOTAL_SCORE = 0 and SED_SCORE is null.
    UNKNOWNSED_SCORE is null and TOTAL_SCORE = 0, or SED_SCORE is null and AERORAD_PCT = 100
    CERTAINTY
    Relative certainty of the potential ranking for REE deposits based on number of data sets contributing to the TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGH5 datasets contribute to TOTAL_SCORE
    MED3 or 4 datasets contribute to TOTAL_SCORE
    LOW1 or 2 datasets contribute to TOTAL_SCORE.
    UNKNOWNSED_SCORE is null and TOTAL_SCORE = 9, or SED_SCORE is null and AERORAD_PCT = 100
    SYMBOL
    Concatenation of fields POTENTIAL and CERTAINTY. This field is used to symbolize the map showing REE-Th-Y-Nb (-U-Zr) estimated resource potential. (Source: this data set)
    ValueDefinition
    HIGH,HIGHHigh potential with high certainty. Symbolize with dark red color.
    HIGH,MEDHigh potential with medium certainty. Symbolize with medium red color.
    HIGH,LOWHigh potential with low certainty. Symbolize with pale red color.
    MED,HIGHMedium potential with high certainty. Symbolize with dark yellow color.
    MED,MEDMedium potential with medium certainty. Symbolize with medium yellow color.
    MED,LOWMedium potential with low certainty. Symbolize with pale yellow color.
    LOW,HIGHLow potential with high certainty. Symbolize with dark green color.
    LOW,MEDLow potential with medium certainty. Symbolize with medium green color.
    LOW,LOWLow potential with low certainty. Symbolize with pale green color.
    UNKNOWNUnknown potential. Symbolized in gray color.
    SandU_hucs_state
    HUC scoring for sandstone U (-V-Cu) deposits model based on criteria described in accompanying report. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: this data set) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.
    SED_SCORE
    Points scored from elements in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical data is below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:5
    ARDF_SCORE
    Points scored from the Alaska Resource Data File (ARDF). Scoring parameters are described in the accompanying report. A null value signifies no ARDF sites are present the HUC. A value of 0 signifies that an ARDF site is found within the HUC, but the keyword score is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:4
    RCK_SCORE
    Points scored from elements in the rock geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no sedimentary rock samples are present in the HUC. A value of 0 signifies data is within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name ROCK_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:7
    LITH_SCORE
    Points scored from presence of arkose sandstone, Tertiary/Cretaceous sedimentary rocks, sedimentary rocks, and unconsolidated geologic units within a 3km buffer around select sedimentary geologic units. Data layers are in Lithology.gdb/SandU. Scoring parameters are described in the accompanying report. The value 0 signifies that geologic units of interest are not in the HUC. Alias field name LITHOLOGY_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:4
    COAL_SCORE
    Points scored from presence of Upper Cretaceous to Tertiary coal in the HUC. Data layer is Lithology.gdb/SandU/Coal. The value 0 signifies that Upper Cretaceous to Tertiary coal is not mapped in the HUC. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    AERORAD_SCORE
    Points scored from aerial gamma-ray detection of U in raster dataset uranium_grs.tif. Scoring parameters are described in the accompanying report. A null value signifies that aeroradiometric data is unavailable in this HUC. A value of 0 signifies that data is available within the HUC, but the value is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:2
    TOTAL_SCORE
    Summation of LITH_SCORE, RCK_SCORE, COAL_SCORE, SED_SCORE, and AERORAD_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:19
    SED_PCT
    The calculated percentage of SED_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_PCT. SED_PCT is null if SED_SCORE is null or if SED_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    ARDF_PCT
    The calculated percentage of ARDF_SCORE of the TOTAL_SCORE. ARDF_PCT is null if ARDF_SCORE is null or if ARDF_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    RCK_PCT
    The calculated percentage of RCK_SCORE of the TOTAL_SCORE. Alias field name ROCK_PCT. RCK_PCT is null if RCK_SCORE is null or if RCK_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    LITH_PCT
    The calculated percentage of LITH_SCORE of the TOTAL_SCORE. Alias field name LITHOLOGY_PCT. LITH_PCT is null if LITH_SCORE = 0 and there no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    COAL_PCT
    The calculated percentage of COAL_SCORE of the TOTAL_SCORE. COAL_PCT is null if COAL_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    AERORAD_PCT
    The calculated percentage of AERORAD_SCORE of the TOTAL_SCORE. AERORAD_PCT is null if AERORAD_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    POTENTIAL
    Estimation of relative potential for sandstone U deposits based on TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHTOTAL_SCORE >= 8
    MEDTOTAL_SCORE = 5 to 7
    LOWTOTAL SCORE 0 to 4
    UNKNOWNHUC has no data for geochemistry (rock or sediment), aeroradiometric, and ARDF, or HUC only has lithology or coal data available.
    CERTAINTY
    Relative certainty of the potential ranking for sandstone U deposits based on number of data sets contributing to the TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGH5 or 6 datasets contribute to TOTAL_SCORE
    MED4 datasets contribute to TOTAL_SCORE
    LOW1 to 3 datasets contribute to TOTAL_SCORE.
    UNKNOWNHUC has no data for geochemistry (rock or sediment), aeroradiometric, and ARDF, or HUC only has lithology or coal data available.
    SYMBOL
    Concatenation of fields POTENTIAL and CERTAINTY. This field is used to symbolize the map showing sandstone-hosted U (-V-Cu) estimated resource potential. (Source: this data set)
    ValueDefinition
    HIGH,HIGHHigh potential with high certainty. Symbolize with dark red color.
    HIGH,MEDHigh potential with medium certainty. Symbolize with medium red color.
    HIGH,LOWHigh potential with low certainty. Symbolize with pale red color.
    MED,HIGHMedium potential with high certainty. Symbolize with dark yellow color.
    MED,MEDMedium potential with medium certainty. Symbolize with medium yellow color.
    MED,LOWMedium potential with low certainty. Symbolize with pale yellow color.
    LOW,HIGHLow potential with high certainty. Symbolize with dark green color.
    LOW,MEDLow potential with medium certainty. Symbolize with medium green color.
    LOW,LOWLow potential with low certainty. Symbolize with pale green color.
    UNKNOWNUnknown potential. Symbolized in gray color.
    SnGranite_hucs_state
    HUC scoring for Sn-W-Mo (-Ta-In-fluorspar) deposits associated with specialized granites based on criteria described in accompanying report. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: this data set) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.
    SED_SCORE
    Points scored from elements in the stream sediment geochemistry dataset, Geochemistry.gdb/seds/sed_BV. Scoring parameters are described in the accompanying report. A null value signifies that no stream sediment samples are present in the HUC. A value of 0 signifies that data is found within the HUC, but the analytical value is below the cutoff defined by the scoring parameters. Alias field name SEDIMENT_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:9
    ARDF_SCORE
    Points scored from the Alaska Resource Data File (ARDF). Scoring parameters are described in the accompanying report. A null value signifies no ARDF sites are present the HUC. A value of 0 signifies that an ARDF site is found within the HUC, but the keyword score is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    IGN_SCORE
    Points scored from igneous rock indices in rock_igneous.gdb/all_igneous_ratios. Scoring parameters are described in the accompanying report. A null value signifies absence of data in that HUC. A value of 0 signifies that data is found within the HUC, but values do not meet the scoring parameters. Alias field name IGNEOUS_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:5
    AERORAD_SCORE
    Points scored from aerial gamma-ray detection of Th in raster dataset thorium_grs.tif. Scoring parameters are described in the accompanying report. A null value signifies that aeroradiometric data is unavailable in this HUC. A value of 9 signifies that data is found within the HUC, but the Th/K value is below the cutoff defined by the scoring parameters. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:1
    PAN_SCORE
    Points scored from heavy mineral concentrate geochemistry and presence of certain minerals in Geochemistry.gdb/HMC/HMC_BV and HMC_mnrlgy. Scoring parameters are described in the accompanying report. A null value signifies that neither heavy mineral concentrate geochemistry nor mineralogy data is in the HUC. A value of 0 signifies that data is found within the HUC, but does not meet the scoring parameters. Alias field name PAN_CONC_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:6
    LITH_SCORE
    Points scored from presence of granitic rocks in a geologic unit on the state geologic map. Data layer is in Lithology.gdb/SnGranite_lith. Scoring parameters are described in the accompanying report. The value 0 signifies that geologic units of interest are not in the HUC. Alias field name LITHOLOGY_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:1
    TOTAL_SCORE
    Summation of SED_SCORE, ARDF_SCORE, IGN_SCORE, PAN_SCORE, LITH_SCORE and AERORAD_SCORE. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:22
    SED_PCT
    The calculated percentage of SED_SCORE of the TOTAL_SCORE. Alias field name SEDIMENT_PCT. SED_PCT is null if SED_SCORE is null or if SED_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    ARDF_PCT
    The calculated percentage of ARDF_SCORE of the TOTAL_SCORE. ARDF_PCT is null if ARDF_SCORE is null or if ARDF_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    IGN_PCT
    The calculated percentage of IGN_SCORE of the TOTAL_SCORE. Alias field name IGNEOUS_PCT. IGN_PCT is null if IGN_SCORE is null or if IGN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    PAN_PCT
    The calculated percentage of PAN_SCORE of the TOTAL_SCORE. Alias field name PAN_CONC_PCT. PAN_PCT is null if PAN_SCORE is null or if PAN_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    LITH_PCT
    The calculated percentage of LITH_SCORE of the TOTAL_SCORE. Alias field name LITHOLOGY_PCT. LITH_PCT is null if LITH_SCORE is null or if LITH_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    AERORAD_PCT
    The calculated percentage of AERORAD_SCORE of the TOTAL_SCORE. AERORAD_PCT is null if AERORAD_SCORE = 0 and there are no other data scores. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:100
    POTENTIAL
    Estimation of relative potential for Sn-W-Mo (-Ta-In-fluorspar) deposits associated with specialized granites based on TOTAL_SCORE. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHTOTAL_SCORE >= 8
    MEDTOTAL_SCORE = 3 to 7
    LOWTOTAL SCORE 0 to 2 and sediment data exists within the HUC.
    UNKNOWNTOTAL_SCORE = 0 and SED_SCORE is null
    CERTAINTY
    Relative certainty of the potential ranking for Sn-W-Mo (-Ta-In-fluorspar) deposits associated with specialized granites is based on number of data sets contributing to the TOTAL_SCORE and the estimated POTENTIAL. Parameters for potential and certainty are described in the accompanying report. (Source: this data set)
    ValueDefinition
    HIGHPOTENTIAL = HIGH and 6 datasets contribute to TOTAL_SCORE, or POTENTIAL = MED and 5 or 6 datasets contribute to TOTAL_SCORE, or POTENTIAL = LOW and 4 to 6 datasets contribute to TOTAL_SCORE.
    MEDPOTENTIAL = HIGH and 4 to 5 datasets contribute to TOTAL_SCORE, or POTENTIAL = MED and 3 to 4 datasets contribute to TOTAL_SCORE, or POTENTIAL = LOW and 3 datasets contribute to TOTAL_SCORE.
    LOWPOTENTIAL = HIGH and 1 to 3 datasets contribute to TOTAL_SCORE, or POTENTIAL = MED and 1 to 2 datasets contribute to TOTAL_SCORE, or POTENTIAL = LOW and 1 to 2 datasets contribute to TOTAL_SCORE.
    UNKNOWNTOTAL_SCORE = 0 and SED_SCORE is null
    SYMBOL
    Concatenation of fields POTENTIAL and CERTAINTY. This field is used to symbolize the map showing Sn-W-Mo (-Ta-In-fluorspar) estimated resource potential. (Source: this data set)
    ValueDefinition
    HIGH,HIGHHigh potential with high certainty. Symbolize with dark red color.
    HIGH,MEDHigh potential with medium certainty. Symbolize with medium red color.
    HIGH,LOWHigh potential with low certainty. Symbolize with pale red color.
    MED,HIGHMedium potential with high certainty. Symbolize with dark yellow color.
    MED,MEDMedium potential with medium certainty. Symbolize with medium yellow color.
    MED,LOWMedium potential with low certainty. Symbolize with pale yellow color.
    LOW,HIGHLow potential with high certainty. Symbolize with dark green color.
    LOW,MEDLow potential with medium certainty. Symbolize with medium green color.
    LOW,LOWLow potential with low certainty. Symbolize with pale green color.
    UNKNOWNUnknown potential. Symbolized in gray color.
    HUC12_state
    Template HUC dataset used for scoring the six different deposit models. It is a modified version of the National Watershed Boundary 12-digit HUCs (subwatershed) for Alaska. Modifications include clipping to a state coastline and duplicating the HUC12 value when a HUC was divided during the clipping procedure. (Source: this data set)
    HUC12
    Text field containing the original 12-digit code from the WBD HUC. In this dataset, HUC12 is no longer unique. See Lineage section for explanation. Null values represent areas that were not defined as subwatersheds in WBD. (Source: this data set) The original 12-digit code from WBD.
    ToHUC
    The HUC12 identifier for the HUC to which water flows to. (Source: Watershed Boundary Dataset) Values may be a HUC12 value, CANADA, CLOSED BASIN, OCEAN, or blank or null value.
    HUC_ID
    Unique identifier for this modified subwatershed dataset. If the polygon is from WBD and has not been subdivided, then HUC_ID = HUC12. For polygons which have been subdivided, HUC_ID is a concatenation of HUC12 and a suffix. For new polygons in areas where subwatersheds do not exist, HUC_ID is a unique 6 digit code and HUC12 is null. (Source: this data set) Unique identifier that is a 6 digit code, a 12 digit code, or a 12 digit code with a suffix.

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?
  3. To whom should users address questions about the data?

Why was the data set created?

Data layers, including geochemistry, igneous rock indices, mineral resource data, lithology, and aeroradiometrics, were used to score subwatershed areas in Alaska to analyze for the potential of six different deposit models. The subwatershed areas, 12-digit HUCs, provide almost continuous statewide coverage, are roughly similar in size, and are physiographic features with connections to earth processes. Each HUC, or hydrologic unit code, was evaluated on various data layers to score for the potential and certainty of these deposit types: REE-Th-Y-Nb, placer and paleoplacer gold, PGE, carbonate hosted copper, sandstone uranium, and Sn-W-Mo in specialized granites. These datasets contain the individual HUC scores for each data layer and the combined data scores.

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 2)
    Subwatershed boundaries were obtained from the Watershed Boundary Dataset (WBD). The Alaska subwatershed polygons were clipped using a 1:250,000 scale coastline. For areas not covered by subwatersheds (Saint Lawrence Island, the Pribilof Islands, and the Aleutian Islands) new polygons estimating HUCs were created.
    Field HUC12 is no longer unique after the clipping process. Field HUC_ID was created to provide a unique key field. HUC_ID = HUC12 if the value HUC12 remains unique. If HUC12 value is no longer unique, HUC_ID is a concatenation of HUC12 and a unique suffix. Unique HUC_IDs were created for the new polygons that were created where subwatershed do not exist.
    Date: 2015 (process 2 of 2)
    Criteria for querying the different data layers was developed for each deposit model and these are listed in tables in the accompanying report. A customized ArcGIS Python script was created for each deposit model. The Python script scored each HUC for the pertinent data layer (ARDF, geochemistry, igneous rock indices, lithology, and aeroradiometric data), and then totaled the scores for each HUC. Based on the range and distribution of total score, a ranking of high, medium, low, or unknown potential was assigned. Also, a certainty ranking was assigned to the HUC based on the quality and/or quantity of the data available for scoring the HUC's potential.
  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?
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    The Alaska 12-digit HUCs obtained from the Watershed Boundary Dataset (WBD) does not include Saint Lawrence Island, the Pribolof Islands, or the Aleutian Islands west of Umnak Island. For this study, new 'HUC' polygons were created for these areas. Each of the smaller islands is considered a new 'HUC' polygon. For Saint Lawrence Island and Adak Island, rough areas estimating a 'HUC' polygon were created.
    The 12-digit HUCs from WBD have unique 12 digit identifiers (attribute HUC12). The HUC dataset presented here uses field HUC_ID as the key field. HUC_ID = HUC12 if the polygon originated from WBD. If the original HUC was subdivided, each portion has the original HUC12 value with a suffix after a decimal point. Unique HUC_IDs were created for new 'HUC' polygons.
  5. How consistent are the relationships among the observations, including topology?
    A template HUC dataset was created for the mineral potential analyses. The 12-digit HUCs (subwatersheds) were obtained from the national watershed boundary dataset (WBD). A 1:250,000 scale coastline was used to 'clip' the HUC dataset. Each polygon within the extent of the WBD data has its original HUC12 identifier. In the process of clipping the HUCs with the Alaska coastline, HUC12 is no longer a unique identifier. The field HUC_ID is the unique field for the 12-digit HUCs and is identical for all the scored HUC data layers.

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 data set's metadata 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 trademark, manufacturer, or otherwise does not necessarily constitute or imply it 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: 30-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 13:27:22 2016