Quincy mine in Hancock, Michigan
thingiverse
Model of the Quincy Mine, in Hancock, Michigan. One of the most prolific copper mines in its day, the Quincy mine also housed the world's longest mine shaft (1.75 miles on a 55 degree incline) by the time it ceased copper production in 1945. During WWI, it was responsible for roughly 25% of the nation's copper. Want to learn more? https://en.wikipedia.org/wiki/Quincy_Mine http://www.geo.mtu.edu/KeweenawGeoheritage/BlackLavas/Quincy.html Better still, take a tour: http://www.quincymine.com/
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