HLC Heartlink Canada (1999)

Rio Alto Mining Limited ("Rio Alto") (TSX
VENTURE:RIO)(BVLAC:RIO)(DBFrankfurt:MS2) is pleased to announce that the series
of metallurgical tests undertaken by Heap Leaching Consulting S.A.C. ("HLC") of
Lima, Peru on a 100 tonne sample of representative material from Rio Alto's La
Arena Gold Oxide Project has been completed several weeks in advance of the
previously anticipated completion timeline of late April or early May. HLC has
advised Rio Alto that the run-of-mine column leach test work was completed
several weeks sooner than anticipated due to favourable leaching characteristics
of the sample material. Rio Alto anticipates receiving the report from HLC
regarding the result of these metallurgical tests in mid-April.


Rio Alto, in consultation with Coffey Mining Pty. Ltd. ("Coffey Mining"),
determined to defer the completion of an updated reserve estimate and associated
NI 43-101 Technical Report (the "Report") on La Arena Project so that the
results of these metallurgical tests can be independently verified by Coffey
Mining and incorporated into the reserve estimate for the La Arena Gold Oxide
Project to be presented in the Report. Coffey Mining is scheduled to undertake
its verification process in mid-April 2010 with the Report anticipated to be
completed in May 2010.


Rio Alto announced, on August 5, 2009, that it had engaged HLC to conduct tests
to determine the gold recovery cycle and processing costs for the purpose of
determining the design specifications for a gold recovery plant for La Arena
Gold Oxide Project. Management of Rio Alto anticipates that favourable leaching
characteristics of material taken from La Arena Gold Oxide Project will, during
the initial years of the project, result in a higher gold recovery rate, a
shorter gold leach cycle and lower processing costs as compared to earlier
estimates.


Rio Alto will announce the results of these metallurgical tests once
independently verified by Coffey Mining.


Forward Looking Statements

This news release contains certain forward-looking information including
statements concerning the leaching characteristics of material taken from La
Arena Gold Oxide Project, the metallurgical test results, the expected timing of
the availability of independently verified metallurgical test results, the
preparation of a NI 43-101 Technical Report on La Arena Gold Oxide Project and
the length of the gold recovery cycle and processing costs of a mine that may be
constructed on La Arena Gold Oxide Project. All statements included herein,
other than statements of historical fact, are forward-looking information and
such information involves various risks and uncertainties. There can be no
assurance that such information will prove to be accurate, and actual results
and future events could differ materially from those anticipated in such
information. A description of assumptions used to develop such forward-looking
information and a description of risk factors that may cause actual results to
differ materially from forward-looking information can be found in Rio Alto's
disclosure documents on the SEDAR website at www.sedar.com. Rio Alto does not
undertake to update any forward-looking information except in accordance with
applicable securities laws.


To learn more about Rio Alto Mining Limited, please visit: www.rioaltomining.com

ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED

Alex Black, Chief Operating Officer

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