CALGARY, ALBERTA -- (Marketwire) -- 07/21/10 -- Rio Alto Mining Limited ('Rio Alto') (TSX VENTURE: RIO)(OTCQX: RIOAF)(PINK SHEETS: RIOAF)(BVLAC: RIO)(DBFrankfurt: MS2) is pleased to announce that it has received from the General Bureau of Environmental Affairs (DGAA) of the Ministry of Energy and Mines (MEM) of Peru Directoral Resolution No
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