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The Lucky Friday mine is an underground silver, lead, and zinc mine near Mullan, Idaho, it is operated by Hecla Mining company. Lucky Friday is one of the few mines remaining operational in the silver valley, producing 1000 tons of ore per day, the ore deposit type is Polymetallic veins of hydrothermal origin, the mining method used is underhand cut and fill mining. The mine's primary access and production are through the Silver Shaft, an 18 feet (5.5m) diameter, concrete lined shaft sunk to a depth of 6,200 feet (1,890m). 〔(【引用サイトリンク】url=http://www.hecla-mining.com/operations/operations_luckyfriday.php )〕 〔(【引用サイトリンク】url=http://mrdata.usgs.gov/mrds/show-mrds.php?dep_id=10257227 )〕 ==Geography== The mine is located one mile east of Mullan, Idaho in the Coeur d’Alene Mining District. 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「Lucky Friday mine」の詳細全文を読む スポンサード リンク
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