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Knowlton Mine, Mass City, Ontonagon Co., Michigan, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 46° North , 89° West (est.)
Margin of Error:~3km

An underground copper mine consisting of three shafts located near Mass City, MI. The Knowlton Mining Co. was organized in 1860 but exploration work started in 1853. The mine officially closed in 1867, but work continued on tribute until 1885. The mine produced approx. 992,000 lbs. of refined copper. Minerals that can be found include copper, silver, datolite, and other micro minerals.

Mineral List

3 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.


Butler, B.S., and Burbank, W.S., 1929, The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.

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

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