Minesota Mine

Minesota Mine is a mineral-rich area of Ontonagon County, Michigan, United States that was been mined for its silver and primarily copper. Other minerals which occur at the site but have no economic importance include quartz, calcite, epidote, pumpellyite, chlorite and feldspar. It is a fissure mine that produced some of the largest masses of native copper ever found. It was open between 1846 and 1865.

External link

USGS Mineral Resource Database entry

 

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