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Gold mining in Alaska
Gold mining in Alaska, a state of the United States, has been a major industry and impetus for exploration and settlement since a few years after the United States acquired the territory from Russia. Russian explorers discovered placer gold in the Kenai River in 1848, but no gold was produced. Gold mining started in 1870 from placers southeast of Juneau, Alaska.〔A.H. Koschman and M.H. Bergendahl (1968) ''Principal Gold-Producing Districts of the United States'', U.S. Geological Survey, Professional Paper 610, p.8.〕
Gold is found and has been mined throughout Alaska; except in the vast swamps of the Yukon Flats, and along the North Slope between the Brooks Range and the Bering sea. Areas near Fairbanks, Juneau, and Nome are responsible for most of Alaska's historical and current gold production. Nearly all of the large and many of the small placer gold mines currently operating in the US are in Alaska.〔http://minerals.usgs.gov/minerals/pubs/commodity/gold/gold_mcs07.pdf〕 Six modern large-scale hard rock mines operate in Alaska in 2008; four of those are gold-producing mines (an additional gold mine suspended production in late 2007). There are also some small-scale hard rock gold-mining operations. Alaska currently produces more gold (in 2007: 673,274 troy oz from lode mines, and 53,848 troy oz from placer deposits) than any state except Nevada.〔http://www.nma.org/pdf/g_production.pdf〕 In 2007, gold accounted for 15% of the mining wealth produced in Alaska. Zinc and lead, mainly from the Red Dog mine, accounted for 73%; silver, mainly from the Greens Creek mine, accounted for 8%; coal and aggregates accounted for nearly 2% each. Alaska produced a total of 40.3 million troy ounces of gold from 1880 through the end of 2007.〔http://www.dggs.dnr.state.ak.us/webpubs/dggs/ic/text/ic057.PDF〕〔http://''Alaskas Mineral Industry 2006, Zumigal and Hughes, DGGS Special Report 61''www.dggs.dnr.state.ak.us/webpubs/dggs/sr/text/sr061.PDF〕
==Active mines==
The following are active gold-producing mines and advanced lode exploration or development projects.
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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