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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,〔 which sits on the largest reinforced concrete engine foundation ever poured.〔 The shaft hoist house was designated a Michigan State Historic Site in 1969〔 and listed on the National Register of Historic Places in 1970.〔 == History == The Quincy Mining Company was first organized in 1846,〔(Quincy Mining Company ), Hancock, Houghton County, MI, Historic American Engineering Record, Survey number HAER MI-2, Charles K Hyde, Larry D Lankton, Charles O'Connell, Sarah McNear, p. 7〕 and incorporated two years later, to mine the then-recently discovered Portage Lake copper formations.〔(Quincy Mine No. 2 Shaft Hoist House ) from the state of Michigan, retrieved 10/15/09〕 It wasn't until 1856 that the mine hit upon their most productive lode, and it took until 1862 before the first dividend was paid.〔(Quincy No. 2 Mine Hoist ), from the American Society of Mechanical Engineers〕 However, after that time, the Quincy Mine was a reliable investment, paying dividends every year from 1867 until 1921.〔 In the early part of the twentieth century, the shafts at Quincy Mine were increasing in depth at a prodigious rate as the company pushed farther underground in search of copper. Between 1905 and 1920, the depth of the principal shafts increased from 5000 feet to over 7000.〔Survey number HAER MI-2, p. 456〕 The requirements to lift rock to the surface from ever-increasing depths severely strained the capabilities of the company's mine hoist equipment.〔Survey number HAER MI-2, p. 457〕 By 1916, the hoist servicing the number 2 shaft had reached its depth limit.〔Survey number HAER MI-2, p. 461〕 Rather than abandon the shaft or eke out a little more depth by retrofitting the existing hoist, Quincy hired the Nordberg Manufacturing Company and Bruno V. Nordberg〔 to design a new hoist engine〔 at a cost of $160,000.〔 It would be the largest mine hoist in the world.〔〔 Quincy contracted for delivery of the Nordberg engine in early 1917, but World War I intervened, delaying receipt until late 1919.〔 In the meantime, a hoist house was designed by J. H. Hoff and built by the McLean Construction Company of Chicago〔(Drawing: No. 2 Hoist House and Engine, 1918-1920 ), Historic American Engineering Record, Survey number HAER MI-2, John R. Carter, 1978.〕 at a cost of $43,000 for the foundation and $53,000 for the superstructure.〔 The house was essentially finished in 1918.〔Survey number HAER MI-2, p. 462〕 Installation of the hoist began in December 1919; it took until November 1920 before the hoist was fully operational.〔 The additional cost for installing the hoist was $34,000;〔 the total cost of the project, including building, engine, installation, and ancillary structures, was $370,000.〔Survey number HAER MI-2, p. 463〕 The hoist operated from 1920 until the mine closed in 1931,〔 a victim of falling copper prices.〔Survey number HAER MI-2, p. 473〕 The building and hoist were restored in 1968 and are open to the public.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quincy Mine No. 2 Shaft Hoist House」の詳細全文を読む スポンサード リンク
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