Quincy mine in Hancock, Michigan
thingiverse
The Quincy Mine, located in Hancock, Michigan, was one of the most productive copper mines of its time. By 1945, when it stopped producing copper, the mine's shaft had reached an impressive length of 1.75 miles at a steep incline of 55 degrees, setting a record for the world's longest mine shaft. During World War I, the Quincy Mine supplied roughly 25% of America's copper needs. Want to discover more about this fascinating piece of history? Visit these websites: https://en.wikipedia.org/wiki/Quincy_Mine or http://www.geo.mtu.edu/KeweenawGeoheritage/BlackLavas/Quincy.html. For an even more immersive experience, take a guided tour at quincymine.com.
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