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Juneau gold belt
The Juneau gold belt is located in the southeastern portion of the U.S. state of Alaska. This belt is approximately in length, north/northwest-trending, and extends southeastward to Windham Bay, southeast of Juneau.〔Knoff, Adolf, ''Geology of the Berners Bay Region, Alaska,'' USGS Bulletin 446, 1911, p. 7ff ()〕 The belt contains over 200 gold-quartz-vein deposits with production nearing of gold.〔(【引用サイトリンク】title=Wagner; Boston King; Salmon Creek Gold Mining Co. Mine, Juneau District, Juneau Borough, Alaska, USA )〕 More than three-quarters of Alaska's lode gold was mined from the Juneau gold belt.
==History==
Gold mining in the belt became active after an 1869 study of the Juneau mining district, of which the Juneau gold belt is but one part. Chief Kowee was one of the earliest gold prospectors in the belt area. In 1880, he revealed to prospectors Joe Juneau and Richard Harris the presence of gold in Silver Bow Basin's Gold Creek, after which Juneau was founded in the same year. The Juneau gold rush of 1880 resulted in some of the largest gold mines in the world, including the Treadwell complex of lode mines on Douglas Island and the Alaska-Juneau lode mine, in Juneau itself. The steep, wet, timber-covered, seaside mountain setting provided water power, transportation, and lumber such that, "extraordinarily low costs of operation make available low grade ore that under conditions only slightly different would be valueless."〔Eakin, H.M., p96., Mineral Resources of Alaska, 1914, USGS Bulletin 622〕
In 1895, southeastern Alaska was the first part of the Territory of Alaska to have its mineral resources researched by the U.S. Geological Survey. It surveyed the gold deposit areas of Juneau and Sitka. Systematic surveying began in 1902 which included a topographic map of the gold-bearing area adjacent to Juneau. In the following year, a detailed map of the Juneau region's geology was mapped in detail. A reconnaissance of almost the entire Juneau gold belt was carried out from Port Houghton to the boundary with Canada; in 1904, another reconnaissance, this time of nearby Admiralty Island, was conducted, concentrating on ore deposits and economic geology. The 1986 study by the Bureau of Mines concentrated on the mineral resources of the northern region of southeast Alaska, specifically covering the Juneau gold belt. Aside from information on geological formations of the area, data related to mining was also examined.
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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