Latitude: 47°25'47"N
Longitude: 87°57'57"W
Commodities (Major) - Copper
Deposit Type: Fissure Copper Veins
Development Status: Past Producer
Deposit Model: 96: Native Cu
Host Rock Unit: Portage Lake Volcanics
Host Rock: Basalt
An underground copper mine consisting of 6 shafts located near Mandan. The Bluff Mining Company was organized in 1852 and sank two shafts on a fissure discovered crossing the property. The company drifted out approximately 600 feet. Little copper was recovered and the mine was abandoned in 1855. In 1856, the Pennsylvania Mining Company took ownership of the property and created the Wyoming Mining Company to explore the area. Six veins of copper rich rock were discovered and in 1865, the company sank four additional shafts on the veins. In addition, a crosscut was created between the old Bluff adit and the new No. 4 Shaft of the Wyoming in an effort to drain water. All work ceased in 1866 after very little copper was recovered. The area around the mine is accessible, but very little of the original pile remains. Some copper and datolite can be found.
References
JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, KEWEENAW COUNTY, P. 29-30, SITE ID # 420011, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.
The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed.
Kaminski-Hamka, T., 2011, The Copper Mines of Keweenaw County, Michigan. Copperlady Press, 150 pp.
DeGood, L., 2011, Michigan Copper Mining Stocks and Bonds. 401 pp.
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