USMIN Prospect- and mine-related features animation screenshot

Screenshot from the animated gif of prospect- and mine-related features on USGS topographic maps through time at https://mrdata.usgs.gov/usmin/. Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous U.S. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pits, and other features. Red indicates coal and hard-rock mine features and black indicates industrial mineral features.

This is one of several geospatial data portals on the Mineral Resources Online Spatial Data website (https://mrdata.usgs.gov/).