Rio Alto Mining Limited
TSX VENTURE : RIO
OTCQX : RIOAF
LMA : RIO
FRANKFURT : MS2

Rio Alto Mining Limited

February 17, 2012 11:49 ET

Rio Alto Mining Limited-Corporate Update: Filing of Technical Report

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Feb. 17, 2012) - Rio Alto Mining Limited ("Rio Alto" or the "Company") (TSX VENTURE:RIO)(OTCQX:RIOAF)(LMA:RIO)(DBFrankfurt:MS2) is pleased to announce that the updated Technical Report referred to in the Company's news release of January 5, 2012 in respect of updated mineral resource estimates for the Company's La Arena Project located in north central Peru has been completed. A copy of this Technical Report is available under the Company's SEDAR profile at www.sedar.com and on the Company's website at www.rioaltomining.com.

ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED

Alex Black, President & CEO

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts the responsibility for the adequacy or accuracy of this release.

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