|
The PolyMet Mine or NorthMet Mining Project is a proposed mining and processing operation in the NorthMet Deposit in northeastern Minnesota.〔Map, http://www.mncenter.org/Portals/0/maps/Polymet%20Site%20Basin%20Divide%20Map.pdf〕 The project is controversial with potential environment effects being a major concern. ==Summary== Three open pit mines are planned with the deepest being about 700 feet. Grinding, separation and Sulphite Excavated material not desired (waste rock) would be stored next to the pits in large, 20-story high piles The hydrometallurgical process of flotation and autoclave leach the ore Tailings, the leftover sand-like particles of rock that have been stripped of their economic metals in flotation, will be collected and pumped in slurry form to the tailings basin. Some reclamation is planned and financial assurance plans are being made.〔(Reclamation fact sheet )〕 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「PolyMet mine」の詳細全文を読む スポンサード リンク
|