CALGARY, ALBERTA -- (Marketwire) -- 02/09/11 -- Rio Alto Mining Limited ('Rio Alto') (TSX VENTURE: RIO)(OTCQX: RIOAF)(BVLAC: RIO)(DBFrankfurt: MS2) is pleased to announce that it has exercised its option and has acquired 100% of La Arena gold-copper project ('La Arena Project') located in north-central Peru upon payment of the exercise price of
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