SOURCE: Oriental Minerals Inc.

December 03, 2007 08:30 ET

Oriental Reports Up to 2.41% Zinc, 0.84% Lead and 48.4 g/t Silver From Surface Sampling 2-4 km West of Sangdong Deposit

VANCOUVER, BC--(Marketwire - December 3, 2007) - Oriental Minerals Inc. (TSX-V: OTL) is pleased to announce base metal and silver results of up to 2.41% Zn, 0.84% Pb and 48.4 g/t Ag from a recently completed reconnaissance rock chip sampling program from an area 2-4 kilometers west of Oriental's Sangdong Tungsten-Molybdenum deposit.

Oriental considers these results as very significant as they demonstrate the potential for polymetallic zinc-lead-copper-silver mineralisation elsewhere within the Sangdong Property. Skarn-type Lead-Zinc-Silver deposits, which were mined up until the mid-1990s, occur in the same rock sequence in the Taebaek district to the east of Sangdong.

The next phase of work will involve more systematic sampling and geological mapping to determine the extent, continuity and significance of the mineralisation and whether follow-up geophysical surveys and drilling are warranted.

SANGDONG REGIONAL ROCK CHIP SAMPLING

Results have been received from 24 reconnaissance rock chip samples collected from roadside outcrops and around two small abandoned adits within the larger Sangdong Property. Samples were selected that showed evidence of sulphides and/or skarn minerals. Six samples returned anomalous base metals, silver and tungsten results from within the larger Sangdong Property.

-***-

The details of the anomalous results are as follows:

Sample   UTM52    UTM52    Zn    Pb    Cu    Ag      W
   No   Easting  Northing   %     %     %     g/t   ppm   Comments
-------------------------------------------------------------------------
2509    483035   4111970   0.08  0.02  0.15  17.9   390   Ferruginous
                                                          scree sample
-------------------------------------------------------------------------
42086   482028   4113296   0.37        0.11   4.5    60   Sample
                                                          collected from
                                                          adit wall
-------------------------------------------------------------------------
42087  482053  4113382     2.41        0.15  11.3   150   Sample
                                                          collected from
                                                          adit wall
-------------------------------------------------------------------------
42090  482211  4112218     0.31        0.41  0.03  48.4   Siliceous
                                                          pyritic shale,
                                                          Myobong Slate.
                                                          Roadside
                                                          outcrop
-------------------------------------------------------------------------
42091  481767  4112361     0.04        0.74   0.03   46   Ferruginous
                                                          shale, Myobong
                                                          Slate. Roadside
                                                          outcrop
-------------------------------------------------------------------------
42092  481723  4112541     0.26        0.84   0.19  16.2  Limestone skarn
                                                          near Myobong
                                                          Slate contact.
                                                          Roadside
                                                          outcrop
-------------------------------------------------------------------------

-***-

The locations of the samples are shown on a plan presented on the Oriental web site: http://www.orientalminerals.com/s/MapPhotos.asp?ReportID=274062

QA/QC

Rock chip samples were prepared at the on-site preparation facility at the Sangdong project with pulps being submitted to ALS Chemex laboratory in Brisbane, Australia and analyzed by ME-ICP41s, Au-AA25 and ME-XRF05 for Mo, Sn and W. Zn values greater than 1% were reanalyzed by method OG46.

Quality Control: As the rock chip samples were of a reconnaissance nature no blanks, standards or duplicates samples were inserted in the batch.

QUALIFIED PERSON

This Press Release has been prepared by Mr. Neil McLean, a member of the AusIMM with over twenty-five years' relevant experience, who is the Qualified Person for the purposes of this release.

On behalf of the Board of Directors,
Willie McLucas
President, CEO and Director
+ 44 7881 816 980

Statements in this news release, other than purely historical information, including statements relating to the Company's future plans and objectives or expected results, constitute Forward-looking statements. Such statements are based on numerous assumptions and are subject to all the risks and uncertainties inherent in the Company's business, including risks related to mineral exploration and development. Consequently, actual results may vary materially from those described in the forward-looking statements.

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

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