Rio Alto Reports the Resumption of Operations at La Arena

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Jun 5, 2013) - Rio Alto Mining Limited ("Rio Alto" or the "Company") (TSX:RIO)(NYSE:RIOM)(LMA:RIO)(DBFrankfurt:MS2) wishes to advise that, further to the June 3 announcement, normal operations have resumed at the La Arena mine site.

Rio Alto does not expect that its production guidance for 2013 will be affected due to this situation.

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

Alex Black, President & CEO