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Indiana Mine, Winona, Greenland Township, Ontonagon Co., Michigan, USA

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Latitude & Longitude (WGS84): 46° 47' 57'' North , 88° 59' 57'' West
Latitude & Longitude (decimal): 46.7991666667, -88.9991666667
An underground copper mine consisting of two shafts between Mass City and Twin Lakes, MI. The Indiana Mining Co. was organized in 1862 and worked for three years until 1865. No copper is known to have been produced during this time. The company reorganized in 1909, but no rock was milled and the mine was abandoned. Copper and datolite can be found here. Micro collectors have also faired well on the piles.

Mineral List

22 entries listed. 20 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Henwood, W.J. (1871): Observations on Metalliferous Deposits: On the Native Copper of Lake Superior. Transactions of the Royal Geological Society of Cornwall 8(1), 385-489.

Butler, B.S., and Burbank, W.S. (1929): The Copper Deposits of Michigan. USGS Prof. Paper 144, 238 pp.

The Copper Country Rock & Mineral Club (2001): Red Gold and Tarnished Silver, 2nd Ed., 44 pp.

Rocks & Min.:58:112.

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