Treasure Hunt

“The U.S. Geological Survey (USGS) Mineral Resources Data System catalogs information about mineral resources around the United States and the world. Using the map tool, users can zoom in to obtain reports and data on past and present mines, mine prospects, and processing plants.” Source: https://www.americangeosciences.org/critical-issues/maps/mineral-resources-data-system-map-viewer

Check it out if you’re interested: https://mrdata.usgs.gov/mrds/map-graded.html