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New World Mining District : ウィキペディア英語版
New World Mining District


The New World Mining District The New World Mining District is an area of mineralization that sits to the northeast of Cooke City and Yellowstone National Park, in Park County, Montana. The district hosts extensive deposits of gold, silver and copper in zones of carbonate replacement. These deposits are the result of Eocene hydrothermal alteration of Cambrian carbonates related to the Absaroka volcanic field. Alteration and mineralization occurs primarily within carbonate clasts hosted in a volcanic breccia pipe and in carbonates that lies adjacent to that breccia.〔Elliot, J.E., Kirk, A.R., and Johnson, T.W., 1992 Field Guide - Gold-Copper-Silver Deposits of the New World District., Tobacco Root Geological Society. Field, C. and J. E. Elliott (1992). Guidebook for the Red Lodge-Beartooth Mountains-Stillwater area, Tobacco Root Geological Society, Inc.〕
==History==
Initial exploration of the region occurred in the 1860s with extensive workings developed at the Homestatke and Little Daisy mines between 1904 and 1925. The Homestake mine stopped only a few hundred feet from a high-grade ore body. This ore body was later discovered by Crown Butte Mines in 1989 and 1990 as a result of an intensive drilling campaign.〔Johnson, T.W., and Thompson, T.B., 2006., Breccia and Carbonate Hosted AU-Cu-Ag Replacement Mineralization Associated with the Homestate Porphyry Intrusive Complex, New World District, Montana., Economic Geology v. 101 pp 955–980〕〔Elliot, J.E., Kirk, A.R., and Johnson, T.W., 1992 Field Guide - Gold-Copper-Silver Deposits of the New World District., Tobacco Root Geological Society. Field, C. and J. E. Elliott (1992). Guidebook for the Red Lodge-Beartooth Mountains-Stillwater area, Tobacco Root Geological Society, Inc.〕〔http://www.colorado-west.com/cooke/newworldmines.html, Accessed 7-9-2012〕

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