Prospect- and mine-related features on USGS topographic maps

Online link https://mrdata.usgs.gov/usmin/
Description Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pit
Originators Fernette, Gregory L.; Horton, John D.; King, Zachary R.; San Juan, Carma A.; and Schweitzer, Peter N.
Metadata Questions and answers
Point features in the western US with state and country boundaries.
Point features in the western US with state and country boundaries.