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  "Title": "Locatable Mineral Assessment Tracts for the U.S. Geological Survey Sagebrush Mineral-Resource Assessment Project",
  "Author": "San Juan, Carma A., Horton, John D., Parks, Heather L., Mihalasky, Mark J., Anderson, Eric D., Benson, Mary Ellen, Box, Stephen E., Cossette, Pamela M., Denning, Paul D., Giles, Stuart A., Hall, Susan M., Hayes, Timothy S., Hearn, Jr., Carter B., Hofstra, Albert H., John, David A., Ludington, Stephen D., Lund, Karen, Mauk, Jeffrey L., Robinson, Gilpin R., Rockwell, Barnaby W., Rytuba, James J., Smith, Steven M., Stillings, Lisa L., Van Gosen, Bradley S., Vikre, Peter G., Wallis, John, Wilson, Anna B., Zientek, Michael L., Zürcher, Lukas",
  "Comments": "The polygon (vector) feature class represents locatable mineral resource assessment tracts (tracts of land) associated with the Department of the Interior (DOI) Sagebrush Focal Areas (SFAs) in Montana, Wyoming and Utah, central Idaho, and the Oregon-Nevada-Idaho border area. The mineral-resources tracts are geographic areas that were assessed by the USGS and were determined to be geologically favorable for a deposit type of interest to a depth of 1 kilometer. Qualitative assessment methods outlined by the Bureau of Land Management (BLM) were used to develop tract boundaries and to assign a level of mineral-resource potential and certainty to each tract. The general process included (1) identifying possible mineral deposit types for locatable commodities specified by BLM for each focal area, (2) outlining those areas that potentially contained mineral deposits based on geology, mineral occurrences, geophysics, soil and stream-sediment geochemistry, alteration mineral assemblages inferred from satellite imagery, BLM claims and permit data, mineral-exploration activity, and existing mineral-resource assessment data, and (3) evaluating the level of mineral-resource potential and level of certainty associated with the outlined areas using BLM assessment categories. A full description of the assessment is provided in the accompanying report (Day and others, 2016).\nSFAs, identified by agencies of the DOI, are high-quality sagebrush habitat areas supporting high densities of breeding greater sage-grouse (Centrocercus urophasianus). SFAs are within priority habitat areas or areas where land-use measures are intended to minimize or avoid habitat disturbance. Seven SFAs are within the USGS Sagebrush Mineral-Resource Assessment Project study area. They include the Bear River Watershed, North-Central Idaho, North-Central Montana, Southeastern Oregon and North-Central Nevada, Sheldon-Hart Mountain National Wildlife Refuge Complex, Southern Idaho and Northern Nevada, and Southwestern and South-Central Wyoming SFAs, as well as additional areas in Nevada (termed the \u201cNevada additions\u201d) proposed by the State of Nevada. Landscape-scale conservation efforts by the BLM, U.S. Fish and Wildlife Service (FWS), the U.S. Forest Service (USFS), State agencies, private land owners, and other partners are striving to conserve the breeding sagebrush habitat for the greater sage-grouse across these areas.\nAccompanying report (Chapter A): Day, W.C., Hammarstrom, J.M., Zientek, M.L., and Frost, T.P., eds., 2016, Overview with methods and procedures of the U.S. Geological Survey mineral-resource assessment of the Sagebrush Focal Areas of Idaho, Montana, Nevada, Oregon, Utah, and Wyoming: U.S. Geological Survey Scientific Investigations Report 2016\u20135089, 211 p., http://dx.doi.org/10.3133/sir20165089.\nPurpose:\nThe polygons representing mineral-resource assessment tracts are suitable for use in Geographic Information Systems (GIS) or other database and geospatial software. The data may be used to derive maps, perform geospatial analyses, or to evaluate mineral-resource potential of locatable minerals in the SFAs. The information is intended to meet the needs of a wide community of users that includes the geoscience and mineral-exploration communities, as well as State and Federal agencies, private industry, and the general public.\nSupplemental_Information:\nThis USGS data release consists of an ArcGIS 10.3 geodatabase containing four polygon feature classes. The USGS feature class described in this metadata is \u201cUSGS_SaMiRA_Tracts\u201d and contains the outlines of mineral-resource assessment tracts developed for the study. The remaining three polygon feature classes are boundaries provided by the BLM that were directly relevant to the study. The BLM boundary layers include (1) BLM_GRSG_Withdrawal_StudyArea - geographic areas, specified by the BLM Greater Sage-Grouse (GRSG) Conservation Strategy, that are within SFAs and are being considered for withdrawal from future mineral-resource development, (2) BLM_GRSG_Withdrawal_StudyArea_NV_Additions - additional withdrawal areas proposed by the State of Nevada in 2016, and (3) BLM_PLSS_StudyAreas - the Public Land Survey System (PLSS) township boundaries, simplified to outer perimeters, that contain the proposed withdrawal areas. The polygons in the BLM_PLSS_StudyAreas boundary layer include townships that were added during the course of the study. Metadata for the boundary layers are provided by BLM and all four GIS feature classes are provided as ArcGIS shapefiles.\nPolygons representing locatable mineral-resource assessment tracts are organized by deposit type in a single feature class (USGS_SaMiRA_Tracts). This structure allows for easy display of select data using attribute fields to either symbolize or to specify a subset of polygons (via definition queries in ArcGIS), for example, \u201call high potential tracts in all study areas\u201d or \u201cpolymetallic vein deposits only\u201d. Polygons representing the same deposit type do not overlap, however, polygons representing different deposit types may overlap. Polygons of different deposit types may have identical spatial footprints and thus precisely overlap one another. Viewing tract polygons as outlines without color fills and with labels will show where polygons overlap or duplicate.",
  "Subject": "This USGS data release consists of an ArcGIS 10.3 geodatabase containing four polygon feature classes.",
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  "Keywords": "deposit type, mineral commodity, mineral occurrence, mineral resource assessment, mineral system, sagebrush focal area, locatable mineral tract, environment, geoscientificInformation, metallic mineral resources, nonmetallic mineral resources, clay deposits, gem resources, economic geology, mineralogy, native species, resource exploration, mining and quarrying"
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