SOURCE: Oriental Minerals Inc.

June 12, 2007 08:30 ET

Drilling at Sangdong Tungsten-Molybdenum Deposit Extends Continuity in Mineralisation

VANCOUVER, BC--(Marketwire - June 12, 2007) - Oriental Minerals Inc. (TSX-V: OTL) is very pleased to announce the next round of complete drill results received from holes SD-04 and SD-06, from the Company's drill program at the Sangdong tungsten-molybdenum project in South Korea.

Intersections from hole SD-04 include 21 metres (51-72m) grading 0.08% WO3 and 0.01% MoS2 and 43 metres (107-150m) grading 0.06% WO3 and 0.01% MoS2. Intersections from SD-06 include 24 metres (22-46m) grading 0.10% WO3 and 0.02% MoS2 and 23 metres (65-88m) grading 0.10% WO3 and 0.02% MoS2. SD-04 and SD-06 were designed to drill test the entire skarn package up dip from hole SD-03.

These results from holes SD-04 and SD-06 confirm that skarn hosted disseminated tungsten-molybdenum mineralization is present continuously at shallow depths from 6 metres, some 400 metres up dip from the third hole SD-03. This skarn mineralization then extends a further 700 metres from SD-03 down dip past SD-01, giving a minimum strike length of continuous mineralization of at least 1,100 metres. This mineralization shows consistent increasing trends in both grades and thicknesses down dip towards the northwest.

"We are highly encouraged by drilling to-date," noted Steve Flechner, President of Oriental Minerals. "The potential to convert the historic Sangdong underground mine to an open-pit mining method may yield significant bulk-tonnage benefits. Work in progress, such as the geotechnical drilling for a future Environmental Impact Statement, further reflects our confidence in the Sangdong mine."

Results from hole SD-04 are tabulated below:

--------------------------------------------------------------------------
Intersection   Depth   WO3   MoS2   Au    Bi          Formation
Thickness              (%)   (%)   (g/t) (%)
--------------------------------------------------------------------------
21 metres      51-72m  0.08  0.01  0.08  0.03   Shale (Pungchon Limestone)
 1 metre       89-90m  0.07   -    0.05  0.01   Shale (Pungchon Limestone)
 1 metre       98-99m  0.07   -     -     -     Shale (Pungchon Limestone)
 1 metre     107-108m  0.30  0.01  0.14  0.05   Shale (Pungchon Limestone)
 3 metres    111-114m  0.08   -    0.03  0.03   Skarn (Myobong Slate)
 1 metre     120-121m  0.07   -    0.01  0.02   Skarn (Myobong Slate)
 1 metre     122-123m  0.03  0.14   -     -     Skarn (Myobong Slate)
 2 metres    124-126m  0.12  0.01  0.05  0.02   Skarn (Myobong Slate)
 6 metres    133-139m  0.09   -    0.08  0.02   Skarn (Myobong Slate)
 7 metres    146-153m  0.09  0.01   -    0.01   Skarn (Myobong Slate)
------------------------------------------------------------------------

SD-04 intersected the following lithological units in sequence:
0-111m. Shale  member of basal Pungchon Limestone.
111-144m. Quartz-scheelite vein stockworks in skarn altered Myobong Slate.
144-225m. Jangsan Quartzite.

Results from hole SD-06 are tabulated below:

-------------------------------------------------------------------------
Intersection   Depth   WO3  MoS2   Au    Bi          Formation
Thickness              (%)  (%)   (g/t) (%)
-------------------------------------------------------------------------
1 metre         6-7m  0.79  0.01   0.77  0.28   Shale (Pungchon Limestone)
2 metres      22-24m  0.07  0.13   0.07  0.01   Shale (Pungchon Limestone)
1 metre       27-28m  0.34  0.02   0.05  0.02   Shale (Pungchon Limestone)
1 metre       30-31m  0.11   -     0.03  0.01   Shale (Pungchon Limestone)
2 metres      33-35m  0.35  0.07   0.33  0.10   Shale (Pungchon Limestone)
2 metres      40-42m  0.15  0.03   0.06  0.02   Skarn (Myobong Slate)
2 metres      44-46m  0.24   -     0.06  0.02   Skarn (Myobong Slate)
3 metres      65-68m  0.11  0.07   0.09  0.02   Skarn (Myobong Slate)
2 metres      71-73m  0.40  0.02   0.13  0.02   Skarn (Myobong Slate)
7 metres      81-88m  0.15  0.04   0.09  0.01   Skarn (Myobong Slate)
1 metre       96-97m  0.08   -     0.08  0.02   Skarn (Myobong Slate)
1 metre     106-107m  0.24  0.01   0.19  0.04   Skarn (Myobong Slate)
1 metre     122-123m  0.14  0.01   0.03  0.03   Jangsan Quartzite
7 metres    151-158m  0.10  0.01   0.01  0.01   Jangsan Quartzite
2 metres    161-163m  0.02  0.20   0.04  0.02   Jangsan Quartzite
------------------------------------------------------------------------

SD-06 intersected the following lithological units in sequence:
0-39m. Shale  member of basal Pungchon Limestone.
39-111m. Quartz-scheelite vein stockworks in skarn altered Myobong Slate.
111-300m. Jangsan Quartzite.

The current status on the Sangdong drill program is:
SD-09. Current depth is 364 metres.
SD-10. Completed at its target depth of 300 metres.
SD-11. Completed at its target depth of 300 metres.
SD-12. Completed at its target depth of 300 metres.
SD-13. Currently at 241 metres.
SD-14. Currently at 8 metres.
SD-15. Setting up.
SD-16. Setting up.
SD-17. Setting up.
SD-18. Setting up.
A map of the drill holes can be viewed at www.usetdas.com/maps/orientalminerals/SangdongDrillingJune2007.gif.

Drilling is now well underway on the Phase II resource definition program, using a 100 metre x 100 metre pattern drill hole spacing. An inferred category NI-43-101 compliant resource statement is scheduled for completion in October 2007. Drill spacing will then close up to a 50 metre x 50 metre drill spacing to provide a measured and indicated category NI-43-101 compliant resource statement by March 2008.

The Sample Preparation Laboratory facility is now commissioned and capable of processing 200 samples per day.

Note: Samples are 1-metre split HQ core samples and were submitted to ALS Chemex laboratory in Brisbane, Australia and analyzed by Ore Grade Method XRF-ME05, Au-AA21, ME-ICP41s and Ag-OG46. Quality Control: Blanks and Standards samples were routinely inserted with the drill samples at random intervals. Analysis of Standards indicates the laboratory results are all within +/-5% of certified assays and so results are considered reliable. Blank samples were clean, indicating no cross contamination in the samples.

QUALIFIED PERSON

The qualified person for the purposes of this release is Mr. Mark Dugmore.

On behalf of the Board of Directors,
Damien Reynolds
Chairman and Director
www.orientalminerals.com

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.

Contact Information