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Press release from Marketwire

Rio Alto Produces 58,081 Ounces of Gold in Q2 2012

Friday, July 06, 2012

Rio Alto Produces 58,081 Ounces of Gold in Q2 201207:35 EDT Friday, July 06, 2012CALGARY, ALBERTA--(Marketwire - July 6, 2012) - Rio Alto Mining Limited ("Rio Alto") (TSX:RIO)(OTCQX:RIOAF)(LMA:RIO)(DBFrankfurt:MS2) is pleased to announce that its La Arena Gold Mine poured 58,081 ounces of gold during the three months ended June 30, 2012 (114,054 ounces of gold poured for the six months ended June 30, 2012). Sales in the second quarter of 43,234 ounces of gold at an average realized price per ounce of $1,586 generated cash sales proceeds of $68.6 million. During the quarter the Company delivered 14,846 ounces of gold to settle 17,466 notional ounces of its gold prepayment facility. The next scheduled delivery under the prepayment facility is in September 2013, however, Rio Alto may elect to make advance deliveries during 2012 in settlement of the remaining 27,170 notional ounces.Ore and waste production from the La Arena Gold Mine for the second quarter of 2012 was:ActualMine PlanDifferenceTonnesAu g/tTonnesAu g/tTonnesAu g/tOre mined1,105,7481.252,160,0000.63(1,054,252)0.62Ore to stockpile85,5330.20-(85,533)0.20Ore from stockpile599,8330.63-599,8330.63Ore placed on pad1,620,0481.092,160,0000.63(539,952)0.46Ounces placed on pad56,77343,75113,022Waste mined2,016,6942,745,975(729,281)Waste to Ore Ratio1.821.27ProductionOunceVariancesVariancesOre placed on pad difference(539,952)(10,937)Ore grade difference0.4623,959Gold ounce difference13,022Production for the first six months of 2012 amounted to: ActualMine PlanDifferenceTonnesAu g/tTonnesAu g/tTonnesAu g/tOre mined2,395,2311.294,320,0000.66(1,924,769)0.63Ore to stockpile263,4720.30-(263,472)0.30Ore from stockpile930,9430.70-930,9430.70Ore placed on pad3,062,7021.204,320,0000.66(1,257,298)0.54Ounces placed on pad118,10391,94626,157Waste mined4,278,7324,314,012(35,280)Waste to Ore Ratio1.791.00ProductionOunceVariancesVariancesOre placed on pad difference(1,257,298)(26,760)Ore grade difference0.5452,917Gold ounce difference26,157Since ore was first mined at the La Arena Gold Mine the gold grade has been significantly higher than planned. This is principally due to mining narrow high grade, vertical or near vertical veins within the larger disseminated ore body. These veins were not identified in the drilling undertaken to generate the reserve model and mine plan. Management cannot predict whether high grade veins will be mined in the future. Overall mining fleet productivity has been lower than planned during the first six months of 2012 due, at various times, to either limited leach pad capacity or waste dump capacity. Both leach pad capacity and waste dump capacity are being increased.With a proven technical team, strong operating and financial performance and high quality development and exploration projects, Rio Alto is positioned to grow into an intermediate gold producer. Based on current plans and assumptions the Company projects gold oxide production of over 200,000 ounces per year by 2014. All planned development, exploration and capital expenditures for 2012 will be completed without external funding. Rio Alto plans to pursue accretive acquisitions and carry out planned exploration programs. Forward Looking Statements This news release contains certain forward-looking information including statements concerning expected gold production. All statements included herein, other than statements of historical fact, are forward-looking information and such information involves various risks and uncertainties. There can be no assurance that such information will prove to be accurate, and actual results and future events could differ materially from those anticipated in such information. A description of assumptions used to develop such forward-looking information and a description of risk factors that may cause actual results to differ materially from forward-looking information can be found in Rio Alto's disclosure documents on the SEDAR website at www.sedar.com. Rio Alto does not undertake to update any forward-looking information except in accordance with applicable securities laws.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 LIMITEDAlex Black, President & CEOFOR FURTHER INFORMATION PLEASE CONTACT: Alex BlackRio Alto Mining LimitedPresident & CEO+511 99279 4655 or +511 625 9900alexb@rioaltomining.comORAlejandra GomezRio Alto Mining LimitedInvestor Relations604.628.1401866.393.4493 (FAX)alejandrag@rioaltomining.comwww.rioaltomining.com