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The mine was the first Michigan copper mine to switch from fissure mining to amygdaloid mining, when the recently discovered Pewabic amygdaloid lode was found to cross Quincy property in 1856. [9] High-grade fissure veins contained large, pure masses of copper, but the masses could take days or even months to extract, at high cost.
The Quincy Mine No. 2 Shaft Hoist House is an industrial building located north of Hancock, Michigan along US Highway 41 within the Quincy Mining Company Historic District. The Hoist House contains the largest steam hoisting engine in the world, [ 3 ] which sits on the largest reinforced concrete engine foundation ever poured. [ 3 ]
Drawing of Quincy Stamp Mills site. The Quincy Mining Company Stamp Mills Historic District is a historic stamp mill (used to crush copper-bearing rock, separating the copper ore from surrounding rock) located on M-26 near Torch Lake, just east of Mason in Osceola Township. [2]
Amygdaloid and conglomerate mining turned out to be much more productive and profitable than fissure mining, and the majority of highly successful mines were on amygdaloid or conglomerate lodes. The first mine to successfully mine a stratiform ore body was the Quincy Mine in 1856.
The Quincy Unit of the Keweenaw National Historical Park commemorates one of the most remarkable feats of engineering in northern Michigan, the 9,000-foot (2,700 m) deep Quincy Mine shaft. Nicknamed "Old Reliable" for its record of paying annual dividends for decades, the Quincy mine enjoyed a position on the rich copper rock of the Pewabic Lode.
The Quincy Smelter, also known as the Quincy Smelting Works, is a former copper smelter located on the north side of the Keweenaw Waterway in Ripley, Michigan.It is a contributing property of the Quincy Mining Company Historic District, a National Historic Landmark District.
The mine's Quincy Dredge Number One sank in 1956, and Dredge Number Two was used until 1967, [2] when it too sank during a winter lay-up. [4] By this time, copper prices had fallen low enough that the reclamation process was not profitable, and the Quincy Mine abandoned both the dredge and its reclamation facility.
The Quincy Mine is an extensive set of copper mines located near Hancock, Michigan. The Quincy Mine was known as "Old Reliable," as the Quincy Mine Company paid a dividend to investors every year from 1868 through 1920. The mine operated between 1846 and 1945, although some activities continued through the 1970s. 32