Black Metal Reduction Co Mill (458)

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Mine name Black Metal Reduction Co Mill
State Colorado
County Boulder
Mineral Tungsten
Author Hess, F.L.
The Black Metal Reduction Company's Tungsten mill at the mouth of Boulder Canyon.  Boulder County, Colorado. March 9, 1917.
Caption The Black Metal Reduction Company's Tungsten mill at the mouth of Boulder Canyon. Boulder County, Colorado. March 9, 1917.