Oriental Minerals Inc.
TSX VENTURE : OTL

Oriental Minerals Inc.

April 12, 2006 09:35 ET

Oriental Minerals: Extremely Encouraging Gold and Copper Soil Sampling Results for the Geodo Project, South Korea

CALGARY, ALBERTA--(CCNMatthews - April 12, 2006) - Oriental Minerals Inc. (TSX VENTURE:OTL) is pleased to announce soil sampling results for the Geodo Project, northeast South Korea that are extremely encouraging. Assay results indicate several highly anomalous zones for Au and Cu.

Skarn zones of the Geodo Project have a combined mapped strike length of approximately 4.4km. These comprise a northern zone trending southeast with a strike length of approximately 2,800m, a central southern zone of strike length 1,000m trending east-west and a west southern zone of strike 600m trending south-east. The skarn zones are developed along the northern and southern contacts between Cretaceous intrusives and Cambrian/Ordovician limestone-dolomite units. The skarn grades from endoskarn - garnet skarn - diopside skarn, with highest Au and Cu results associated with the diopside skarn.

SAMPLING

Soil sampling traverses of approximately 100m spacing were carried out over a total of 4.2km of strike of the skarn zones. Samples of approximately 500 grams of material from immediately below the organic horizon were taken every 20m along traverses, with a total of 600 samples collected. Samples were submitted to ALS Chemex (Brisbane, Australia) for analysis for gold (atomic absorption method, detection limit 0.01ppm), copper (ICP method) and a suite of other elements (ICP method, Ag, As, Bi, Co, Fe, K, Mg, Mn, Mo, Na, Ni, P, Pb, S, Sb, W, Zn).

HIGHLIGHTS

The central southern skarn zone shows the highest anomaly with a peak of 3,500ppb (3.50g/t) Au and 17,300ppm (1.73%) Cu. The anomaly has a strike length of 500m of over 300ppb Au and 700m of over 100ppb Au. The anomaly is open ended to the west.

The west southern skarn zone anomaly has a strike length of 500m of over 100ppb Au with a peak of 1,380ppb (1.38g/t) Au and 6300ppm (0.63%) Cu. The anomaly is open ended to the northwest and south east.

The entire northern skarn zone is anomalous in gold (greater than 30ppb) with several higher order anomalies. At the far west of the zone an isolated sample has a value of 580ppb (0.58g/t) Au (106ppm Cu) with the anomaly open to the west. In the central part of the zone an anomaly has a strike length of 250m of over 100ppb Au with a peak of 510ppb (0.51g/t) Au (188ppm Cu). In the eastern part of zone an anomaly has a strike of 350m of over 100ppb with a peak of 310ppb (0.31g/t) Au (55ppm Cu). The anomaly is open ended to the southeast.



GEODO PROJECT SOIL SAMPLE RESULTS - highlights

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Sample
Sample No Locality Type Au ppb Cu ppm
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GD17003S Central Southern Zone Soil 3500 10800
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GD18004S Central Southern Zone Soil 3350 7180
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GD15003S Central Southern Zone Soil 2060 17300
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GD15005S Central Southern Zone Soil 960 4150
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GD13003S Central Southern Zone Soil 660 3180
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GD18006S Central Southern Zone Soil 610 606
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GD19004S Central Southern Zone Soil 440 628
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GD18007S Central Southern Zone Soil 420 408
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GD16008S Central Southern Zone Soil 400 413
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GD14002S Central Southern Zone Soil 330 819
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GD16003S Central Southern Zone Soil 310 805
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GD10009S West Southern Zone Soil 1380 6250
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GD12003S West Southern Zone Soil 1290 116
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GD8001S West Southern Zone Soil 810 4470
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GD11008S West Southern Zone Soil 790 1340
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GD11007S West Southern Zone Soil 740 1725
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GD11006S West Southern Zone Soil 700 3300
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GD2006S West Northern Zone Soil 580 106
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GD24013S West Northern Zone Soil 290 4220
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GD30015S Central Northern Zone Soil 510 188
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GD36017S East Northern Zone Soil 310 55
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GD38027S East Northern Zone Soil 50 2790
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WORK PROGRAM

Due to the very encouraging gold and copper soil values returned for almost the entire mapped strike length of the skarn units, planning for a Q2 two-phase work program has commenced. The initial Phase will include detailed geological and structural mapping and rock chip sampling to define drill targets throughout the large anomalous zone. Phase II will be a drill program.

Oriental Minerals is a minerals exploration company focused on developing its Geodo gold, copper project, and enlarging its portfolio of properties, in South Korea.

ORIENTAL MINERALS INCORPORATED

Malcolm L. Stevens, Executive Chairman

Errol Smart, CEO

Mr. Errol Smart, CEO of Oriental, is the Qualified Person for the Geodo gold and copper project and approved the technical information herein.

This press release does not constitute an offer to sell or a solicitation to buy any of the securities in the United States. The securities have not been and will not be registered under the United States Securities Act of 1933, as amended ("the U.S. Securities Act") or any state securities law and may not be offered or sold in the United States or to U.S. Persons unless registered under the U.S. Securities Act and applicable state securities laws or an exemption from such registration is available. Statements in this press release other than purely historical information, including statements relating to the Company's future plans and objectives or expected results, constitute forward-looking statements. Forward-looking statements are based on numerous assumptions and are subject to all of the risks and uncertainties inherent in the Company's business, including risks inherent in mineral exploration and development. As a result, actual results may vary materially from those described in the forward-looking statements.


The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

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