Minesota Mine
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Minesota Mine is a mineral-rich area of Ontonagon County, Michigan, United States that has 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.