Browsing by Title "Back of D-Kt, Colorado School of Mines Experimental Mine"

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      • Back of D-Kt, Colorado School of Mines Experimental Mine 

        Date:1989?
        The Colorado School of Mines Experimental Mine is located in Idaho Springs, Clear Creek County, Colorado. Originally known as the Edgar Mine, it produced silver and gold, and some lead and copper in the 1870s. The Big Five ...