RIO Rio2 Limited New

Rio Alto Mining Limited (the "Corporation") (TSX VENTURE: RIO)(OTCQX: RIOAF)(BVLAC: RIO)(DBFrankfurt: MS2) announces that Mr. Feisal Somji has resigned as a director and officer of the Corporation.

Mr. Somji served as the President and Chief Executive Officer of the Corporation from May 2007 to June 2010 and most recently as the Corporation's Vice President Corporate Development. Among other successes, Mr. Somji was principally responsible for identifying, negotiating and concluding on behalf of the Corporation its June 2009 acquisition of a private mining company which held the rights to La Arena Project in north central Peru.

The Board would like to thank Mr. Somji for his dedication and service to the Corporation over the past number of years and wishes him every success in his future endeavours.

To learn more about Rio Alto Mining Limited, please visit: www.rioaltomining.com or Rio Alto's SEDAR profile at www.sedar.com.

ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED

Klaus Zeitler, Director

Contacts: Rio Alto Mining Limited Anthony Hawkshaw CFO & Director +1 604 628 1401 or +511 625 9900 tonyh@rioaltomining.com Rio Alto Mining Limited Alejandra Gomez Investor Relations 604.628.1401 866.393.4493 (FAX) alejandrag@rioaltomining.com www.rioaltomining.com