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Rio Alto Reports Fatal Accident at La Arena

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Apr 9, 2013) - Rio Alto Mining Limited (TSX:RIO)(LMA:RIO)(NYSE:RIOM)(DBFrankfurt:MS2) ("Rio Alto" or the "Company") regrets to announce that an employee of a Peruvian civil contractor was fatally injured today while excavating a trench at the Company's operations. As a result of the incident, operations at La Arena have been suspended. Management of the Company is working closely with Peruvian authorities to determine the cause of the incident.

"Our sincere condolences go out to the family of the contractor and the community during this difficult time," commented Alex Black, President and CEO.

ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED

Alex Black, President & CEO