2019-12-132022-02-032019-12-132022-02-03https://hdl.handle.net/11124/173932Donor: Colorado Mining Association.A man operates what appears to be a scraper on a mine dump; caption reads: "Utaco (No. 1)."7 x 5 inchesblack-and-white photographsCopyright retained by Colorado Mining Association.Mineral processing -- Machinery and equipmentMine dumpsMinersMining machineryStillImage