翻訳と辞書 Words near each other ・ Martha McBride Knight ・ Martha McCabe ・ Martha McCarthy ・ Martha McCaughey ・ Martha McClellan Brown ・ Martha McClintock ・ Martha McLean – Anza Narrows ・ Martha McPhee ・ Martha McSally ・ Martha Mears ・ Martha Mears (author) ・ Martha Medeiros ・ Martha Mercader ・ Martha Mier ・ Martha Mijares ・ Martha Mine ・ Martha Minow ・ Martha Mitchell (director) ・ Martha Mitchell effect ・ Martha Moody ・ Martha Morton ・ Martha Moyano ・ Martha Munizzi ・ Martha Mvungi ・ Martha My Dear ・ Martha Mödl ・ Martha N. Johnson ・ Martha Namundjebo-Tilahun ・ Martha Nause ・ Martha Needle Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Martha Mine ： ウィキペディア英語版 Martha Mine The Martha Mine is a gold mine owned by the Newmont Mining Corporation in the New Zealand town of Waihi. ==History== William Nicholl marked out a claim, calling it "Martha" after a family member.〔 Several smaller claims were later merged to form the Martha Company. By 1882 the first battery to break gold-bearing rock was in operation. The Martha Mine eventually grew into one of the world's most important gold and silver mines, after industrial cyanide processes made recovering gold from the low-grade ores easier. Waihi prospered with the mine, by 1908 being the fastest-growing town in the Auckland Province, three times the size of Hamilton.〔(Gold Fever ) (from the 'History & Heritage' section of the 'Waihi.org' website)〕 Underground mining ended in 1952, but not because the mine had run out of gold; current operation is evidence of this. Rather, a series of factors led to a decline in production. Chief among those was the international gold price, which was fixed at $US35 an ounce, limiting the revenue the mine could make. Other factors included the need for a substantial capital expenditure to update the machinery. Although the technology was available to do this, the money was not. Manpower issues also factored into the decision to close the underground mine. There had been two World Wars and the Depression of the 1930s, depleting manpower and creating a difficult economic climate..〔(【引用サイトリンク】 The Original Martha Mine )〕 It was not possible, given these factors, to profitably mine the lower grade ore. In the 1970s and early 1980s the gold price increased. Exploration and prospecting work identified the economic resource that could be profitably exploited through a lower cost open pit approach. The mine was reopened, and continues in production today. 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「Martha 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.