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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 Kelsey Lake Diamond Mine ： ウィキペディア英語版 Kelsey Lake Diamond Mine Kelsey Lake Diamond Mine is a defunct diamond mine in Colorado, USA. It is located in the State Line Kimberlite District, near the Wyoming border, and consists of nine kimberlite volcanic pipes, of which two were open pit mined. At the time it was operating, it was the United States' only modern diamond mine, and only the second commercial diamond mining operation in North America, the first being in the Crater of Diamonds State Park, Arkansas which was mined in the early 1900s. ==History== Ever since diamonds had first been found in the State Line Kimberlite District in 1976, interest had been high in locating a viable commercial mining operation. Geologist Howard Coopersmith headed the Diamond Company L.N. which explored the feasibility of mining diamonds at the Kelsey Lake site. In 1995 Australian firm Redaurum acquired controlling interest in Diamond Co. and proceeded to lease mining rights for the land around Kelsey Lake . Commercial output started in May 1996. After mining and selling approximately 200 carats worth of diamonds, Redaurum was sued by Union Pacific who had originally sold the land in 1896 but claimed that it held on to the mineral rights. The two parties settled the lawsuit but in September 1997 Redaurum decided to liquidate its diamond properties to concentrate on exploration. The mine was operated sporadically until the operation was acquired by McKenzie Bay International Ltd. in 2000. McKenzie bought the mine management firm Diamond Co. from Chapter 11 bankruptcy, transferred all its assets to a subsidiary, Great Western Diamond Co., and invested $2 million in new equipment for the mine. In 2001, McKenzie tried to sell the mine to focus on mining vanadium after the price of that metal rose dramatically. However due to a dispute with the landowner over royalty payments, the sale fell through and McKenzie was unable to find another buyer. The mine ceased operations in 2001, and the site was fully reclaimed by 2006. 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「Kelsey Lake Diamond 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.