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The Mary Murphy Mine was the principal gold mine of the Chalk Creek mining district of Chaffee County, Colorado, United States, near St. Elmo, Colorado. The Mary Murphy Mine operated continuously from 1870 to 1925, and produced 220 thousand ounces of gold, worth $4.4 million then (or about $180,000,000 in 2008), plus considerable silver, lead, and zinc.〔A. H. Koschman and M. H. Bergendahl, 1968, ''Principal Gold-Producing Districts of the United States'', US Geological Survey, Professional Paper 610, p.92〕 There were two aerial tramways connecting the mine to Romley, Colorado and the Denver, South Park and Pacific Railroad. 〔(Romley - Mary Murphy - Colorado Ghost Town )〕 In 1984 the Historic American Engineering Record recorded the structures then standing in the area. Drainage from the old mine into Chalk Creek, a tributary of the Upper Arkansas River, would sometimes cause fish kills at the state-run fish hatchery downstream, such as the kill of 800,000 fingerling trout in 1986.〔(Mine research, Mary Murphy Mine )〕 The Colorado Division of Minerals and Geology consolidated all of the surface wastes and capped them in a “high-and-dry” spot on the mill site. This reduced the dissolved metals levels enough to keep the fish kills from recurring. Since then, the site has been used as test-bed for new ways to treat harmful drainage from abandoned mines in the Colorado Rockies.〔(''Settled, Mined & Left Behind'' ), a report by Trout Unlimited〕 The Mary Murphy Mine is a popular destination for four-wheelers and ghost-town enthusiasts. ==References== 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「Mary Murphy Mine」の詳細全文を読む スポンサード リンク
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