SOURCE: Oriental Minerals Inc.

November 26, 2007 08:30 ET

Oriental Hits 0.41% Tungsten Over 11 Metres Near Surface -- Continues to Expand Deposit North, East and West

VANCOUVER, BC--(Marketwire - November 26, 2007) - Oriental Minerals Inc. (TSX-V: OTL) is pleased to announce further results from diamond drill holes SD-17, 18, 19 and 21 from the Phase 2 drill program at the Sangdong tungsten-molybdenum project in South Korea. Drilling continues to trace a relatively flat-lying, mineralized skarn covering an area of 1200 metres by 600 metres and 150 to 200 metres thick.

Highlights include:

- SD-17, 170 metres @ 0.10% WO3 , including:

  * 9 metres @ 0.25% WO3 (53-62m)
  * 19 metres @ 0.33% WO3 (102-121m)

- SD-18, 186 metres @ 0.12% WO3 , including:

  * 11 metres @ 0.41% WO3  (1-12m)
  * 11 metres @ 0.23% WO3 (99-110m)
  * 12 metres @ 0.24% WO3 (121-133m)

 - SD-21, 24 metres @0.30% WO3 (157-181m)

Results from the four holes announced today are tabulated below based on a cut-off grade of 0.05% WO3.

President and CEO Willie McLucas states: "We are extremely pleased with the results to date from Phase 2 drilling. Today's results continue to show several high-grade horizons near surface. It is significant that the thickness and grades are increasing as we move north, west and east. We believe that results to date already indicate a deposit of world-class size and have initiated an inferred resource estimate that will meet current regulatory requirements while drilling continues to expand the deposit."

Phase 2 drilling is anticipated to be complete by February with the first partial resource estimate expected to be completed by the end of December. This initial estimate will only focus on the south-eastern portion of Sangdong.

Complete results and updated drill plan are available on the website at: http://www.orientalminerals.com/s/MapPhotos.asp?ReportID=274062

-***-

SD-17 - 170m @ 0.10% WO3 (from18m to 188m) including

--------------------------------------------------------------------------
Hole  From  To  Interval  WO3   MoS2   Au     Bi          Rock Type
       (m)  (m)   (m)     (%)    (%)  (g/t)   (%)       (Formation)
--------------------------------------------------------------------------
SD-17   18   32   14     0.12  0.01   0.01  0.04     Sedimentary Breccia
                                                       (Myobong Slate)
--------------------------------------------------------------------------
SD-17   53   62    9     0.25  0.01   0.03  0.03     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-17  102  121   19     0.33  0.01   0.06  0.05     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-17  138  163   25     0.16  0.01   0.03  0.02     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-17  326  331    5     0.13  0.00   0.13  0.04     Quartzite (Jangsan
                                                                Quartzite)
--------------------------------------------------------------------------
SD-17  343  350    7     0.40  0.00   0.05  0.02     Quartzite (Jangsan
                                                                Quartzite)
--------------------------------------------------------------------------


SD-18 - 186m @ 0.12% WO3 (from 0m to 186m) including

--------------------------------------------------------------------------
Hole  From  To  Interval  WO3   MoS2   Au     Bi         Rock Type
       (m)  (m)   (m)     (%)    (%)  (g/t)   (%)       (Formation)
--------------------------------------------------------------------------
SD-18   1    12    11    0.41   0.02   0.13  0.06     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18  61    75    14    0.19   0.01   0.08  0.02     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18  78    84     6    0.20   0.00   0.02  0.02     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18  99   110    11    0.23   0.05   0.12  0.03     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18 113   118     5    0.18   0.00   0.06  0.01     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18 121   133    12    0.24   0.02   0.05  0.02     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18 139   145     6    0.11   0.01   0.08  0.02     Skarn (Myobong Slate)
--------------------------------------------------------------------------
SD-18 157   164     7    0.30   0.00   0.15  0.03     Skarn (Myobong Slate)
--------------------------------------------------------------------------


SD-19 includes

--------------------------------------------------------------------------
Hole  From  To  Interval  WO3   MoS2   Au     Bi          Rock Type
       (m)  (m)   (m)     (%)    (%)  (g/t)   (%)       (Formation)
--------------------------------------------------------------------------
SD-19  195  201    6    0.14   0.00  < 0.01  0.01     Sedimentary Breccia
                                                           (Myobong Slate)
--------------------------------------------------------------------------
SD-19  255  263    8    0.16   0.07   0.07  0.05      Sedimentary Breccia
                                                           (Myobong Slate)
--------------------------------------------------------------------------

SD-21 includes

--------------------------------------------------------------------------
Hole   From   To   Interval  WO3   MoS2   Au     Bi          Rock Type
       (m)    (m)    (m)     (%)    (%)  (g/t)   (%)       (Formation)
--------------------------------------------------------------------------
SD-21  157    181     24    0.30   0.11   0.24  0.05  Sedimentary Breccia/
                                                     Skarn (Myobong Slate)
--------------------------------------------------------------------------

-****-

Current Drill Status:

As at 27th October a total of 36 holes have been drilled, some of which have been necessary to abandon due to not being able to penetrate through the underground workings.

Currently, 4 diamond rigs are operational. The status of drilling is listed below.

--***-

SD-29       Currently at 527 m
SD-30       Completed at 345 m
SD-33       Completed at 400 m
SD-34       Abandoned at 40 m
SD-35       Completed at 200 m
SD-36       Abandoned at 119 m
SD-37       Completed at 300 m
SD-38       Currently drilling at 32 m
SD-39       Currently drilling at 25 m
SD-40       Currently setting up

-****-

Analytical results are awaited from the completed holes.

Updated Drill Program Map

To view an updated Drill Program Map, please go to www.orientalminerals.com

QA/QC

Samples are 1-metre split PQ, HQ and NQ core. The samples were prepared at the on-site preparation facility and pulps 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, Standards and Coarse and Pulp Duplicates samples were routinely inserted with the drill samples at random intervals. All results confirm analysis of Standards and Coarse Duplicates are within the normal bounds of acceptable error of +/- 5%. Blank samples were clean, indicating no cross contamination in the samples. Pulp Duplicate samples are currently being processed by another independent laboratory.

QUALIFIED PERSON

This Press Release has been prepared by Oriental Minerals Senior Project Geologist Mr. Heyward Bates. Mr. Neil McLean, a member of the AusIMM with over twenty five years of relevant experience, is the Qualified Person for the purposes of this release. Mr. McLean is the Principal Geologist of the Geo Discovery Group Pty Ltd. of Brisbane, Australia, who have recently been appointed by Oriental Minerals.

On behalf of the Board of Directors,
Willie McLucas

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

  • Willie McLucas
    President, CEO and Director
    + 44 7881 816 980

    For More Information Contact:
    Spiro Kletas
    Investor Relations
    1-604-681-5755

    www.orientalminerals.com