Rio Alto Announces Option Grant

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Nov. 18, 2011) - Rio Alto Mining Limited (TSX VENTURE:RIO)(OTCQX:RIOAF)(BVLAC:RIO)(DBFrankfurt:MS2) ("Rio Alto" or the "Company") announced today that, subject to regulatory approval, it has granted a total of 3,990,000 options to purchase common shares of Rio...