TORONTO, ONTARIO -- (Marketwire) -- 06/24/11 -- Orvana Minerals Corp. (TSX: ORV), through its wholly-owned subsidiary, Orvana Resources US Corp ('Orvana USA'), announces today the highlights of their 43-101-compliant Prefeasibility Study for the Copperwood copper project, Upper Peninsula, Michigan, USA. The study contemplates a 14-year
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