Spencer, Beverly2019-12-062022-02-032019-12-062022-02-03https://hdl.handle.net/11124/173613Donor: Colorado Mining Association.Photographed by Beverly Spencer.View across the interior of the processsing plant to the float machines, showing two men in the background.Caption reads: "Float Machines in Idarado's World Famous Selective Flotation Mill. Picture 11/24/50 by Beverly Spencer."10 x 8 inchesblack-and-white photographsCopyright retained by Colorado Mining Association.Lead ore processing -- ColoradoSilver ore processing -- ColoradoMineral processing -- Machinery and equipmentViews -- InteriorFlotationStillImage