2020-10-072022-02-032020-10-072022-02-03https://hdl.handle.net/11124/175281Donor: Friends of Mineralogy, Colorado Chapter.Miner with slabbing truck and track mounted "widowmaker" drill.6 x 3 1/2 inchesblack-and-white photographsUnderground mining -- ColoradoMining -- Machinery and equipmentZinc mines and mining -- ColoradoMinersPneumatic drillsStillImage