A mineral resource assessment for tungsten, a critical mineral commodity (see the critical mineral list published by Fortier and others, 2018) for the United States, was carried out by the U.S. Geological Survey (USGS) for a portion of the Great Basin region, in western Nevada and eastern California, between latitudes 36N and 42N and longitudes 116W and 120W. This study (Lederer and others, in review) integrates data from several sources, including geologic, geochemical, geophysical, remote sensing, watershed analysis, and mining with recently developed grade and tonnage models, expert estimates, and software tools and analyses to generate probabilistic estimates of undiscovered tungsten skarn resources. The assessment was conducted following the 3-part assessment methodology developed by Singer and Menzie (2010), which involved the delineation of permissive tracts, as well as the evaluation of interdisciplinary data that were then presented to a panel of experts, who made estimations that were then analyzed using economic filters. These data are presented in several formats: a GIS geodatabase, shapefiles, and tabular (csv) data. Several layers or individual files are derived or contain data from U.S. Geological Survey (USGS) and other existing, published sources, mainly the USGS National Geochemical Database (NGDB), USGS Mineral Resources Data System (MRDS), and the National Uranium Resource Evaluation (NURE) databases.

The dataset consists of the input data, parameters, and results output from mineral resource assessment calculations.

The dataset consists of the input data, parameters, and results output from mineral resource assessment calculations.

The dataset consists of the input data, parameters, and results output from mineral resource assessment calculations.

A mineral resource assessment was performed by the U.S. Geological Survey (USGS) to assess the potential of undiscovered skarn-hosted tungsten resources in the Northern Rocky Mountain region of eastern Idaho and western Montana. This region has seen moderate tungsten trioxide (WO3) production in the past from a variety of mineralization styles including skarn, vein and replacement, and wolframite-quartz veins. The geology of the area is dominated by large plutons of Cretaceous to Tertiary age, emplaced into a belt of sedimentary rock ranging from Mesoproterozoic to Permian age, and affected by tectonism related to the Sevier and later Laramide orogenies. Known tungsten (W) skarn mineral sites are associated with contacts between Cretaceous plutons and calcareous and argillaceous (meta)sedimentary rocks. Two permissive tracts were delineated: the Great Falls Tectonic Zone (GFTZ)-Cretaceous tract and the Bitterroot tract. For the GFTZ-Cretaceous tract, a quantitative assessment was performed in August 2019 using a three-part form of mineral resource assessment following the methods of Singer (1993) and Singer and Menzie (2010). The results of the quantitative assessment indicated that undiscovered W resources might exist in skarn-type deposits within the study area. The Bitterroot tract was assessed qualitatively. The geographic information systems (GIS) data presented here were assembled as part of the W resource assessment. They are divided into assessment data and supporting data. The assessment data include the permissive tracts (W_Tracts) and mineral sites (MineralSites) in the study area compiled from seven different data sources: U.S. Geological Survey Mineral Resource Data System (MRDS) (McFaul and others, 2000), Tungsten Deposits of the United States (USMIN) (Carroll and others, 2018), Montana Bureau of Mines and Geology Abandoned and Inactive Mines Database (MBMG) (Montana Bureau of Mines and Geology, 2006), Idaho Geological Survey Database of the Mines and Prospects of Idaho (IGS) (Tate and others, 2018), Inventory of significant mineral deposit occurrences in the Headwaters Project Area in Idaho, Western Montana, and extreme Eastern Oregon and Washington (SPANSKI) (Spanski, 2004), Mineral deposit data for epigenetic base- and precious-metal and uranium-thorium deposits in south-central and southwestern Montana and southern and central Idaho (KLEIN) (Klein, 2004), and Exploration for critical and strategic minerals in Idaho, Montana, Oregon, and Washington, conducted under the DMA, DMEA, and OME programs, 1950-1974 (DMEA) (Kiilsgaard, 1996; Kiilsgaard, 1997). The supporting data include: Geologic units selected from Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington (Zientek and others, 2005) and State Geologic Map Compilation (SGMC) (ver. 1.1, Horton, 2017) geologic maps; stream sediment geochemistry selected from the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) project (Smith, 1997; ver. 5.0, Smith and others, 2018); whole rock chemistry selected from EarthChem PetDB (Lehnert and others, 2000), du Bray and others (2012), and the National Geochemical Database (U.S. Geological Survey, 2008); airborne radiometric data from the North American compilation of airborne radiometric data (Duval and others, 2005); and airborne magnetic data from the Magnetic Map of North America (U.S. Geological Survey and National Geophysical Data Center, 2002) and the lower frequency content EMAG2 data (Maus and others, 2009). Assessment and supporting data are included in a file geodatabase and are also made available in shapefile and CSV format.

A mineral resource assessment was performed by the U.S. Geological Survey (USGS) to assess the potential of undiscovered skarn-hosted tungsten resources in the Northern Rocky Mountain region of eastern Idaho and western Montana. This region has seen moderate tungsten trioxide (WO3) production in the past from a variety of mineralization styles including skarn, vein and replacement, and wolframite-quartz veins. The geology of the area is dominated by large plutons of Cretaceous to Tertiary age, emplaced into a belt of sedimentary rock ranging from Mesoproterozoic to Permian age, and affected by tectonism related to the Sevier and later Laramide orogenies. Known tungsten (W) skarn mineral sites are associated with contacts between Cretaceous plutons and calcareous and argillaceous (meta)sedimentary rocks. Two permissive tracts were delineated: the Great Falls Tectonic Zone (GFTZ)-Cretaceous tract and the Bitterroot tract. For the GFTZ-Cretaceous tract, a quantitative assessment was performed in August 2019 using a three-part form of mineral resource assessment following the methods of Singer (1993) and Singer and Menzie (2010). The results of the quantitative assessment indicated that undiscovered W resources might exist in skarn-type deposits within the study area. The Bitterroot tract was assessed qualitatively. The geographic information systems (GIS) data presented here were assembled as part of the W resource assessment. They are divided into assessment data and supporting data. The assessment data include the permissive tracts (W_Tracts) and mineral sites (MineralSites) in the study area compiled from seven different data sources: U.S. Geological Survey Mineral Resource Data System (MRDS) (McFaul and others, 2000), Tungsten Deposits of the United States (USMIN) (Carroll and others, 2018), Montana Bureau of Mines and Geology Abandoned and Inactive Mines Database (MBMG) (Montana Bureau of Mines and Geology, 2006), Idaho Geological Survey Database of the Mines and Prospects of Idaho (IGS) (Tate and others, 2018), Inventory of significant mineral deposit occurrences in the Headwaters Project Area in Idaho, Western Montana, and extreme Eastern Oregon and Washington (SPANSKI) (Spanski, 2004), Mineral deposit data for epigenetic base- and precious-metal and uranium-thorium deposits in south-central and southwestern Montana and southern and central Idaho (KLEIN) (Klein, 2004), and Exploration for critical and strategic minerals in Idaho, Montana, Oregon, and Washington, conducted under the DMA, DMEA, and OME programs, 1950-1974 (DMEA) (Kiilsgaard, 1996; Kiilsgaard, 1997). The supporting data include: Geologic units selected from Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington (Zientek and others, 2005) and State Geologic Map Compilation (SGMC) (ver. 1.1, Horton, 2017) geologic maps; stream sediment geochemistry selected from the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) project (Smith, 1997; ver. 5.0, Smith and others, 2018); whole rock chemistry selected from EarthChem PetDB (Lehnert and others, 2000), du Bray and others (2012), and the National Geochemical Database (U.S. Geological Survey, 2008); airborne radiometric data from the North American compilation of airborne radiometric data (Duval and others, 2005); and airborne magnetic data from the Magnetic Map of North America (U.S. Geological Survey and National Geophysical Data Center, 2002) and the lower frequency content EMAG2 data (Maus and others, 2009). Assessment and supporting data are included in a file geodatabase and are also made available in shapefile and CSV format.

Sediment hosted gold deposits in Nevada were first mined in the 1960s from open pit mines with large tonnage and low grade resources. Since that time, continuing exploration and discovery have identified extraordinary resources, and together these deposits now form the second-largest gold endowment on Earth, surpassed only by the Witwatersrand Gold Fields of South Africa. The data herein are part of a larger U.S. Geological Survey (USGS) project to develop an updated geospatial database of mines, mineral deposits and mineral regions in the United States. The point and polygon layers within this database represent locations of mines, mineral occurrences (which includes deposits and prospects), and mining districts in an approximately 200-square mile area northwest of Carlin, Nevada. Tables contain additional information such as commodity, geology, deposit types, activity status, deposit resources, and mine production. The extent of surface workings, when visible on imagery, is also captured and shows the relative size of mining operations. All data were compiled from publicly available sources published from 1910 - 2017. Where possible, data were compiled from primary source reports rather than from syntheses of past reports. Although the selected area does not include the entire Carlin Trend, the area, which covers nine 7.5-minute quadrangles, does contain a wide range of deposit types described through a variety of public data and information. These data are being compiled by the USGS Mineral Deposit Database project with support from the Bureau of Land Management.

Sediment hosted gold deposits in Nevada were first mined in the 1960s from open pit mines with large tonnage and low grade resources. Since that time, continuing exploration and discovery have identified extraordinary resources, and together these deposits now form the second-largest gold endowment on Earth, surpassed only by the Witwatersrand Gold Fields of South Africa. The data herein are part of a larger U.S. Geological Survey (USGS) project to develop an updated geospatial database of mines, mineral deposits and mineral regions in the United States. The point and polygon layers within this database represent locations of mines, mineral occurrences (which includes deposits and prospects), and mining districts in an approximately 200-square mile area northwest of Carlin, Nevada. Tables contain additional information such as commodity, geology, deposit types, activity status, deposit resources, and mine production. The extent of surface workings, when visible on imagery, is also captured and shows the relative size of mining operations. All data were compiled from publicly available sources published from 1910 - 2017. Where possible, data were compiled from primary source reports rather than from syntheses of past reports. Although the selected area does not include the entire Carlin Trend, the area, which covers nine 7.5-minute quadrangles, does contain a wide range of deposit types described through a variety of public data and information. These data are being compiled by the USGS Mineral Deposit Database project with support from the Bureau of Land Management.