Copper History Lesson in Michigan!
Before heading to the Upper Peninsula, we had read that Michigan copper is historically important because it provided over 90% of the nation's copper during the mid-19th century, driving the American Industrial Revolution and powering the Union war effort.
Steve and I have toured an open pit copper mine but never an underground one. Our choice for a thorough copper mining history lesson was found at the Quincy Mine, nestled in the quiet town of Hancock, Michigan. The Quincy Mining Company was one of the largest producers of copper within this area’s world renowned mining district. Operating underground from 1846 to 1945, the Quincy Mine produced nearly one billion pounds of copper that fueled the industrialization of our nation. Unheard of for most mines, it paid dividends every year from 1862-1920, earning the nickname "Old Reliable." At its closing, Quincy shafts plunged 9,260 feet into the ground, making them some of the deepest in the world at the time.
We joined a guided interpretive tour which provided us an opportunity to go over 360 feet underground, surrounded by areas worked by Quincy’s miners in the 1860s. Our leader, Kyle was absolutely incredible. As a 4th year geology student at Michigan Tech, and a professional prospector, he really knew his stuff. For 2½ hours we were spellbound.
The thing behind Steve is a really big deal here. The Nordberg Hoist (1918) is the largest mine steam hoist in existence. Its drum has a capacity of over two miles of 1-5/8" wire rope (13,300 feet). It was rated at approximately 2500 HP. Sadly, it was only used for 11 years before it was taken out of service. It could operate at a cable speed of 3,200 feet per minute (36 MPH). It is a Nordberg cross compound Corliss type engine with two 32" high pressure cylinders, two 60" low pressure cylinders, 66" stroke. It is 60' x 54' wide. and 60' high and weighs 1.8 million pounds. For those who know, this is incredibly impressive.
After a general history of the Quincy Mining Company, in the museum, we donned our hardhats and boarded a funicular to head down the hill.
We were then lead through the adit, a 2,000 foot-long horizontal tunnel, into historic workings dating to the 1860s.
Kyle explained that the state’s copper deposits extend in a narrow band from the Michigan-Wisconsin border to the tip of the Keweenaw Peninsula and out into Lake Superior. The copper-bearing rocks are late Precambrian and mostly volcanic (basaltic lava flows) and sedimentary in origin. Into the lava flows percolating hot waters rising from great depths brought copper and silver in solution. As it cooled, the waters filled the fissures and the gas cavities (amygdule) of the lavas (trap rocks) with pure copper and silver, making the greatest deposit of native copper in the world.
We learned that unlike mass (fissure) lodes, Quincy mined amygdaloid deposits, where copper formed as smaller specks and pieces in the rock. This material was more economical to mine because after being drilled and blasted, rock could be brought to the surface more easily than mass copper, and then stamped to liberate the copper within the rock matrix.
Hkay, how cool is this? Michigan Technological University used an underground classroom carved out of solid rock inside for mining engineering classes and team meetings from the 1970s through the 1990s. Students built their own subterranean classroom to avoid traveling back and forth in harsh winter weather.
While a great deal of this tour was technologically over my head, I left with a full appreciation of what was required to produce the copper that fueled the industrialization of our nation. What a tour!
After touring the local town that copper built, we returned to the Quincy for our evening's campsite.
Michigan is magical!
































































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