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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 Hastings Mine ： ウィキペディア英語版 Hastings Mine The Hastings Mine is a mineral extraction site approximately northeast of the city of Vallejo, Solano County, California. The Hastings site on Sulfur Springs Mountain was used for extraction of cinnabar until the year 1930.〔(U.S.Bureau of Mines, ''Mercury Potential in the United States'' )〕 The Hastings Mine is classified as a medium priority mine from the standpoint of environmental oversight.〔(Oversight of inactive mercury mines in California )〕 In the last inspection of the Hastings Mine in 1997, sediments in a drainage below the mine were found to contain ten parts per million of mercury; furthermore, spring water below the mine exhibited a water concentration of .31 micrograms per liter (a violation of the State of California standard for receiving waters of .05 micrograms per liter). Miles of underground shafts were driven in the course of working the quicksilver deposits in the area. In 1989, Earth Metrics reviewed old 1918 maps of workings of the Hastings and St. John's Mines and found that mine shafts were not driven into the site prior to the year 1918.〔C.Michael Hogan, Marc Papineau et al., ''Environmental Assessment of the columbus Parkway Widening between Ascot Parkway and the Northgate Development, Vallejo'', Earth Metrics Inc. Report 7853, California State Clearinghouse, Sept, 1989〕 ==Environmental effects== Principal ongoing impact is from mercury contamination of spring water flowing beneath the site; moreover, historical analysis has shown that the volume of spring water itself has been greatly reduced from levels of a century ago. This reduction of spring flow has come about due to the extensive mine shafts driven to achieve the cinnabar extraction.〔C.Michael Hogan, Marc Papineau et al., ''Environmental Assessment of the columbus Parkway Widening between Ascot Parkway and the Northgate Development, Vallejo'', Earth Metrics Inc. Report 7853, California State Clearinghouse, Sept, 1989〕 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「Hastings Mine」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.