Gold Recoveries Up To 80% At Cerro Prieto

June 10, 2010

VANCOUVER, British Columbia – (June 10, 2010) Oroco Resource Corp. (TSX-V: OCO) (“Oroco” or “the Company”) is pleased to announce the results of its recently completed second phase metallurgical testing of samples from the Cerro Prieto project in Sonora State, Mexico.  The metallurgical testing has shown recoveries of gold of up to 80%.

The Company retained Kappes Cassidy & Associates (“KCA”), of Reno Nevada, under the direction of the Company’s metallurgical consultant, A.H. Winckers & Associates Inc., to conduct column leach tests of four representative composite samples of mineralized material taken from four separate areas of the Cerro Prieto deposit.  Test work at KCA was under the supervision of Terence Albert, manager of Laboratory Services and Daniel Kappes, PEng, qualified person for KCA.

A summary of the column test recovery results is presented in the following table:

Zone Size
Head Grade
Days Extracted Gold (%) NaCN
1 25.0/6.3 0.95 140 80 0.74 2.02
2 25.0/6.3 0.79 140 66 0.91 2.05
3-Upper 6.3 1.50 81 61* 1.48 7.5
3-Lower 6.3 0.90 81 77* 1.60 7.5

* 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.

Zone 1 encompasses the first 550 meters of the mineralized zone, measured horizontally from the south end of the deposit and from surface to a depth of 150 meters.  The sample taken from this zone was a composite of mineralized core from four drill holes.  Zone 1 holds the higher grade material in the deposit and, being situated at the top of the deposit, would potentially be the first area mined.

Zone 2 encompasses the area immediately below Zone 1 to a depth of approximately 350 meters.  The sample from this zone was a composite of mineralized core from eight drill holes.

Zone 3 – Upper encompasses the 400 meters of strike length immediately to the north of Zone 1 to a depth of 150 meters.  The mineralize sample was taken from four drill holes.

Zone 3 – Lower encompasses the area immediately below Zone 3 – Upper to a depth of 300 meters.  The mineralized sample was taken from six drill holes.

Column leach tests on the samples from Zone 1 and Zone 2 were initially conducted at minus 25 mm and minus 12.5 mm crush sizes.  After 98 days of leaching, gold extraction ranged from 68% for a Zone 1 sample to 47% for a Zone 2 sample, with sodium cyanide consumption ranging from 0.74 kg/t to 0.91 kg/t and hydrated lime additions ranging from 2.02 kg/t to 2.05 kg/t.  After 98 days, the minus 25 mm sample was crushed to 6.3 mm and retested.  Indicated cumulative results are 80% from the Zone 1 sample and 66% from the Zone 2 sample.

Column leach tests on the samples from Zone 3 – Upper and Zone 3 – Lower are still in process using a 6.3 mm crush size.  The leaching process has now been active 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 sample and 61% for the Zone 3 – Upper sample.

Craig Dalziel, Oroco’s President, stated: “The Company is very pleased with the results of the metallurgical testing to date.  An 80% recovery in Zone 1, which holds the higher grade material in the deposit, will enhance the early economic potential of our anticipated heap leach mining operation.”

About Oroco

Oroco is a Canadian-based mineral exploration company with its primary focus on the accelerated development of the gold-bearing oxide zones of its Cerro Prieto project in northern Sonora State, Mexico.  The Cerro Prieto Project consists of the 100% owned San Felix, San Francisco and Cerro Prieto concessions, totalling 2,723 ha, and 4,120 ha of the contiguous Argonauta 5 Fraccion 1 concession to which the Company holds an option to purchase.

For further information, please contact:
Mr. Craig Dalziel, President and CEO
Oroco Resource Corp.
Tel: 604-688-6200

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

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These historical resource estimate models are based upon historical resource estimates prepared by John Thornton in 2011. While, in the opinion of Dane A. Bridge, author of the revised NI 43-101 standard technical report, Geology, Mineralization and Exploration of the Santo Tomas Cu-(Mo-Au-Ag) Porphyry Deposit, Sinaloa, Mexico dated April 21, 2020 (the “Report”), reliable estimation practices were used, in order to upgrade or verify the historical estimations, resampling and assay of historical drill samples, twinning of historical drill holes, and a new program of regularly spaced drilling is required. No qualified person has undertaken sufficient work to classify the current mineral resources or mineral reserves upon which these models are based and the Company is not treating the estimates as current estimates of the mineral resources. The Company gives no assurance that either these models or the historical resource estimates upon which they are based are accurate, and does not undertake any obligation to update the models or to release publicly any update or revisions of the resource estimates except as required by applicable securities law. The reader is cautioned not to rely upon these models or the historical resource estimates upon which they are based.

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