Collection focus: Photographs of mining activities in Colorado (1920?-1980?). The Colorado Mining Association, established in 1876, is the oldest professional mining industry trade association in the U.S. These photos reflect decades of mining and mineral processing throughout the state, making it a unique record of the history of mining in Colorado.
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Placer mining operations, California Gulch, Leadville, 1931. Modified from A0160-032.
Boulder County; Clear Creek County; Gilpin County; Hinsdale County
La Plata County; Lake County; Larimer County
Mesa County; Mineral County; Ouray County; Park County
San Juan County; San Miguel County; Summit County; Teller County
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