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

Rio Alto Mining Limited

May 03, 2010 09:25 ET

Rio Alto Mining Begins Trading on the OTCQX in the US

CALGARY, ALBERTA--(Marketwire - May 3, 2010) - Rio Alto Mining Limited (TSX VENTURE:RIO)(BVLAC:RIO)(DBFrankfurt:MS2)(OTCQX:RIOAF)  ("Rio Alto" or the "Company") is pleased to announce it has commenced trading on OTCQX®, the premier tier of the U.S. Over-the-Counter ("OTC") market, under the symbol "RIOAF".

"Rio understands that liquidity is an important decision factor for investors," commented Feisal Somji, President and CEO, "and with the company trading on the TSXV, the Lima Bolsa, the Frankfurt and now the OTCQX we believe we have helped to provide our shareholders with liquidity within familiar trading markets for investors from around the world."

Investors can find current financial disclosure and Real-Time Level 2 quotes for the company on www.otcqx.com and www.otcmarkets.com.

Hodgson Russ LLP will serve as Rio Alto Mining's Principal American Liaison ("PAL") on OTCQX, and will be responsible for providing guidance on listing requirements.

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

ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED

Anthony Hawkshaw, Chief Financial Officer and Director

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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