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

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