VANCOUVER, BRITISH COLUMBIA--(Marketwire - June 10, 2010) - Oroco Resource Corp. (TSX VENTURE:OCO) ("Oroco" or "the Company") ispleased to announce the results of its recently completed second phasemetallurgical testing of samples from the Cerro Prieto project inSonora State, Mexico. The metallurgical testing has shown recoveries ofgold of up to 80%.
The Company retained KappesCassidy & Associates ("KCA"), of Reno Nevada, under the directionof the Company's metallurgical consultant, A.H. Winckers &Associates Inc., to conduct column leach tests of four representativecomposite samples of mineralized material taken from four separateareas of the Cerro Prieto deposit. Test work at KCA was under thesupervision of Terence Albert, manager of Laboratory Services andDaniel Kappes, PEng, qualified person for KCA.
A summary of the column test recovery results is presented in the following table:
* Interim results; leaching to continue for a minimum of an additional 30 days.
Additional metallurgical testing is being planned to further refine the extraction process.
Zone1 encompasses the first 550 meters of the mineralized zone, measuredhorizontally from the south end of the deposit and from surface to adepth of 150 meters. The sample taken from this zone was a composite ofmineralized core from four drill holes. Zone 1 holds the higher gradematerial in the deposit and, being situated at the top of the deposit,would potentially be the first area mined.
Zone 2encompasses the area immediately below Zone 1 to a depth ofapproximately 350 meters. The sample from this zone was a composite ofmineralized core from eight drill holes.
Zone 3 – Upperencompasses the 400 meters of strike length immediately to the north ofZone 1 to a depth of 150 meters. The mineralize sample was taken fromfour drill holes.
Zone 3 – Lower encompasses the areaimmediately below Zone 3 – Upper to a depth of 300 meters. Themineralized sample was taken from six drill holes.
Columnleach tests on the samples from Zone 1 and Zone 2 were initiallyconducted at minus 25 mm and minus 12.5 mm crush sizes. After 98 daysof leaching, gold extraction ranged from 68% for a Zone 1 sample to 47%for a Zone 2 sample, with sodium cyanide consumption ranging from 0.74kg/t to 0.91 kg/t and hydrated lime additions ranging from 2.02 kg/t to2.05 kg/t. After 98 days, the minus 25 mm sample was crushed to 6.3 mmand retested. Indicated cumulative results are 80% from the Zone 1sample and 66% from the Zone 2 sample.
Column leachtests on the samples from Zone 3 – Upper and Zone 3 – Lower are stillin process using a 6.3 mm crush size. The leaching process has now beenactive for 81 days and will continue for a minimum of another 30 days.Results to date show recoveries of 77% from the Zone 3 – Lower sampleand 61% for the Zone 3 – Upper sample.
Craig Dalziel,Oroco's President, stated: "The Company is very pleased with theresults of the metallurgical testing to date. An 80% recovery in Zone1, which holds the higher grade material in the deposit, will enhancethe early economic potential of our anticipated heap leach miningoperation."
About Oroco
Orocois a Canadian-based mineral exploration company with its primary focuson the accelerated development of the gold-bearing oxide zones of itsCerro Prieto project in northern Sonora State, Mexico. The Cerro PrietoProject consists of the 100% owned San Felix, San Francisco and CerroPrieto concessions, totalling 2,723 ha, and 4,120 ha of the contiguousArgonauta 5 Fraccion 1 concession to which the Company holds an optionto purchase.
Neither TSX Venture Exchange nor itsRegulation Services Provider (as that term is defined in the policiesof the TSX Venture Exchange) accepts responsibility for the adequacy oraccuracy of this release.