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This report by the U.S. Geological Survey (USGS) of the Powder River Basin (PRB) of Montana and Wyoming is part of the U.S. Coal Resources and Reserves Assessment Project. Essential to that project was the creation of a comprehensive drill hole database that was used for coal bed correlation and for coal resource and reserve assessments in the PRB. This drill hole database was assembled using data from the USGS National Coal Resources Data System, several other Federal and State agencies, and selected mining companies. Additionally, USGS personnel manually entered lithologic picks into the database from geophysical logs of coalbed methane, oil, and gas wells. Of the 29,928 drill holes processed, records of 21,393 are in the public domain and are included in this report. The database contains location information, lithology, and coal bed names for each drill hole.

For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Vikre, P.G., Benson, M.E., Bleiwas, D.I., Colgan, J.P., Cossette, P.M., DeAngelo, J., Dicken, C.L., Drake, R.M., II, du Bray, E.A., Fernette, G.L., Glen, J.M.G., Haacke, J.E., Hall, S.M., Hofstra, A.H., John, D.A., Ludington, S., Mihalasky, M.J., Rytuba, J.J., Shaffer, B.N., Stillings, L.L., Wallis, J.C., Williams, C. AcknowledgmentsNumerous persons assisted in preparation, accuracy, and completeness of this report. Ian Madin and Bob Houston, Oregon Department of Geology and Mineral Industries, and Ken Krahulec, Utah Geological Survey, participated in assessment tract delineation and rating and were ready sources of information on mineral resources in their respective states. Maps created by the Nevada Bureau of Mines and Geology (NBMG) that show areas of high mineral potential in northern Nevada (http://minerals.nv.gov/home/features/Mineral,_ Geothermal_and_Oil___Gas_Potential_Maps_of_Sagebrush_Focal_Areas_-_6/24/2015/), and discussions with James Faulds and John Muntean, NBMG, helped to guide the scope and content of this report. Location and status of Plans of Operation in the Humboldt-Toiyabe National Forest of Nevada were provided by Susan Elliott, U.S. Forest Service. Carma San Juan provided geographic information system (GIS), databases services, oversight, and figure construction. Thomas P. Frost, David A. Ponce, Barnaby W. Rockwell, and Steven M. Smith provided management perspective and geophysical and geochemical data and discussion that helped guide assessment tract delineation and rating. Michael L. Zientek provided report templates. Advisory Oversight Committee members Donald I. Bleiwas, Stephen E. Box, Jane M. Hammarstrom, Gilpin R. Robinson, and Michael L. Zientek provided advice on buffering assessment tract boundaries and on delineation and rating of cospatial tracts for different deposit types. Reviews by Charles Thorman, Ryan Taylor, and Kathryn Watts evaluated validity of assessment tracts and improved presentation content and style. Susan M. Hall-Tract delineation, rating, and description for hydroallogenic uranium deposits; locatable mineral commodities not assessed Albert H. Hofstra-Tract delineation, rating, and description for orogenic gold, epithermal gold and silver, volcanogenic massive sulfide copper, Carlin-type gold, black shale vanadium, sedimentary exhalative zinc-lead-silver-gold, Mississippi Vall...

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