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.

This ArcView shapefile contains a polygon representation of the Wyodak-Anderson clinker in the Powder River Basin, Wyoming and Montana. This theme was created specifically for the National Coal Resource Assessment in the Northern Rocky Mountains and Great Plains Region.

This ArcView shapefile contains a polygon representation of the Wyodak-Anderson clinker in the Powder River Basin, Wyoming and Montana. This theme was created specifically for the National Coal Resource Assessment in the Northern Rocky Mountains and Great Plains Region.

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.

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.

This U.S. Geological Survey (USGS) data release provides a digital geospatial database for the geologic map of the central part of the northern Park Range, Jackson and Routt Counties, Colorado (Snyder, 1980). Attribute tables and geospatial features (points, lines, and polygons) conform to the Geologic Map Schema (USGS NCGMP, 2020) and represent the geologic map as published in USGS Miscellaneous Investigations Series Map I-1112. The 218,613-acre map area represents the geology at a publication scale of 1:48,000. References: Snyder, G.L., 1980, Geologic map of the central part of the northern Park Range, Jackson and Routt Counties, Colorado: U.S. Geological Survey, Miscellaneous Investigations Series Map I-1112, scale 1:48,000, https://doi.org/10.3133/i1112. U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10.

This data release provides digital flight line data for a high-resolution airborne radiometric survey over parts of Montana in the vicinity of the Boulder Batholith. The airborne survey was funded by the Earth Mapping Resources Initiative and was designed to meet complementary needs related to geologic mapping and characterization of mineral resource potential. A total of 45,634 line-km of radiometric data were acquired over an irregular-shaped area of 8,272 km^2. Data were collected from a helicopter flown at a nominal terrain clearance of 100 m above topography along E-W flight lines spaced at 200 m intervals. Tie lines were flown in an N-S direction every 2000 m. Data were collected by Sander Geophysics Limited and Dewberry Engineers, Inc. under contract with the USGS using a helicopter with a fully calibrated gamma-ray spectrometer. The survey operated out of the Butte, Montana, airport from July of 2023 to October of 2023. Files that are available in this publication include flight line data for the radiometric survey, a data dictionary, and geoTIFFs of the gridded results.

This U.S. Geological Survey (USGS) data release provides a digital geospatial database for the geologic map of the eastern part of the Challis National Forest and vicinity, Idaho (Wilson and Skipp, 1994). Attribute tables and geospatial features (lines and polygons) conform to the Geologic Map Schema (USGS NCGMP, 2020) and represent the geologic map as published in U.S. Geological Survey (USGS) Miscellaneous Investigations Series Map I-2395 (Wilson and Skipp, 1994). The database represents the geology for the 2.7-million-acre map plate at a publication scale of 1:250,000. The map covers primarily Butte, Custer, Lemhi and Blaine Counties, but also includes minor parts of Clark County. References: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10. Wilson, A.B., and Skipp, Betty, 1994, Geologic map of the eastern part of the Challis National Forest and vicinity, Idaho: U.S. Geological Survey, Miscellaneous Investigations Series Map I-2395, scale 1:250,000, https://ngmdb.usgs.gov/Prodesc/proddesc_10267.htm.

Radiometric data collected as part of a high-resolution airborne magnetic and radiometric survey over the region surrounding the Wet Mountains of southern Colorado, including parts of Custer and Fremont Counties, are provided as digital flight-line and grid files. Radiometric (or gamma-ray) surveys measure naturally occurring low-level radiation and are sensitive to the presence of rocks near the surface that are enriched in uranium, thorium, or potassium. Data for this survey were collected by Sander Geophysics Limited International (SGL) under contract with the USGS. The survey was flown in June and July of 2021 using a helicopter equipped with a gamma-ray spectrometer stowed onboard. The helicopter pilots followed pre-planned flight paths in a grid-like pattern, with east-west lines spaced 150 meters apart and north-south lines spaced 1,000 meters apart. A terrain clearance of 80 meters above ground could be realized in areas of low relief to maximize detection of gamma-rays, but higher clearances, as much as 200–500 meters, were required over rugged terrain and populated areas for safety reasons. A total of 17,032 kilometers were flown along the lines, covering a 2,200 square-kilometer irregular area. SGL performed extensive data processing after completion of flying and delivered the final data and report in February 2022.