2020-10-072022-02-032020-10-072022-02-03https://hdl.handle.net/11124/175161Caption reads: "Eagle M. & M. Co., Rough crushing foundation 8-12-16."Donor: Friends of Mineralogy, Colorado Chapter.Rough crushing unit's foundation and wooden beams under construction, Eagle Mining and Milling Company.5 1/2 x 3 inchesblack-and-white photographsUnderground mining -- ColoradoMineral processing plantsZinc mines and mining -- ColoradoMills and mill-work -- ColoradoStillImage