|
Pyhäsalmi Mine, the second deepest metal mine in Europe〔(Geological Survey of Finland: Pyhäsalmi Mine ), retrieved on 2007-10-14〕 (having depth of ) is located at the Pyhäjärvi municipality in the south of Oulu province, Finland. The zinc and copper mine is owned by First Quantum Minerals, a Canadian mining corporation. == History == In 1958 a local farmer discovered gossan ore during a well construction. Shortly after a sample was delivered to Outokumpu Corporation for analysis and a more thorough geological survey was commenced, revealing a rich volcanogenic massive sulfide ore deposit (VMS-deposit) rich in zinc and copper. In 1959 a decision was made to open a new mine in the area and after few years of construction the mine was opened on March 1, 1962.〔PYHÄSALMI MINE, Informational leaflet, Inmet Mining, 2002(?)〕 Pyhäsalmi mine was worked as an open cast pit until 1967, when underground mining operations commenced. In 1975, open cast mining was stopped. During the years the underground mine has been made gradually deeper. The so-called Olli Shaft was completed in 1985, making the mine deep. New ore was discovered yet deeper, and a depth of was reached in 1996. Later a new shaft, called Timo Shaft was built to exploit the ore deposit between . Timo Shaft's construction work completed in 2001.〔 By 2003, 38.2 million tons of ore have been processed, containing 1.2% copper, 3.1% zinc, 0.46 grams per ton of gold and 14.6 grams per ton of silver, 15.6 million tons of ore remained. The mine houses the Centre for Underground Physics in Pyhäsalmi. The mine is also the home of the worlds deepest sauna, at underground.〔 (Guinness World Records) 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「Pyhäsalmi Mine」の詳細全文を読む スポンサード リンク
|