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Quincy Dredge Number Two
The Quincy Dredge Number Two (previously known as the Calumet and Hecla Dredge Number One) is a dredge currently sunk in shallow water in Torch Lake, across M-26 from the Quincy Mining Company Stamp Mills Historic District and just east of Mason in Osceola Township. It was constructed to reclaim stamping sand from the lake for further processing, and was designated a Michigan State Historic Site in 1978.
==History==
The Reclaiming Sand Dredge was constructed for the Calumet and Hecla Mining Company in 1914 by the Bucyrus Company of South Milwaukee, Wisconsin, and designated the Calumet and Hecla Dredge Number One.〔 The dredge was used to reclaim previously-milled sand deposited in the lake after it had gone through the stamp mill.〔(【引用サイトリンク】 publisher = Keweenaw Free Guide )〕 The dredged sand contained copper that earlier stamping technology had not been able to separate out.〔 Improvements in stamping efficiency and cost increases in traditional shaft mining made these sand tailings economically feasible to reclaim and re-stamp.〔
Calumet and Hecla used the dredge at their Lake Linden Reclamation Plant until 1951.〔 In 1951, the Quincy Mine purchased the dredge and designated it as their Quincy Dredge Number Two, using it at their own reclamation facility,〔〔 which had been in operation since 1943. The mine's Quincy Dredge Number One sank in 1956, and Dredge Number Two was used until 1967,〔 when it too sank during a winter lay-up.〔 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.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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