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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Silver mining in the United States ： ウィキペディア英語版 Silver mining in the United States Silver mining in the United States began on a major scale with the discovery of the Comstock Lode in Nevada in 1858. The industry suffered greatly from the demonetization of silver in 1873 by the Coinage Act of 1873, known pejoratively as the "Crime of 73," but silver mining continues today. The United States produced 1,200 metric tons of silver in 2007, 35% of the silver it used. The remaining 65% was imported from Mexico, Canada, Peru, and Chile. Thirty-six US mines reported silver production. Interest in silver mining has increased in recent years because of increased price of the metal: the average silver price increased from $4.39 per ounce for the year 2001, to $13.45 per ounce for 2007.〔"Mining review," ''Mining Engineering'', May 2007, p.37-47.〕 By 2011, silver prices had soared to almost $49 per ounce in April before dropping to around $34 per ounce in late June. In September 2014, the silver price is around 17 dollars per ounce. 〔https://www.bullionvault.com/gold-price-chart.do?modal=true〕 〔http://www.bullionspotprice.com/silver retrieved 20110625〕 ==By state== 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「Silver mining in the United States」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.