Knowlton Mine, Mass City, Ontonagon Co., Michigan, USA
This page is currently not sponsored. Click here to sponsor this page.
|Location is approximate, estimate based on other nearby localities.|
|Latitude & Longitude (WGS84):||46° North , 89° West (est.)|
|Margin of Error:||~3km|
|Other regions containing this locality:||Keweenaw Peninsula, Michigan, USA|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
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.
3 valid minerals.
This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.