Mainstream Minerals Intersects 1.56 OZ/T Gold Over 8 Feet, Red Lake, Ontario


WINNIPEG, Manitoba, Oct. 23, 2007 (PRIME NEWSWIRE) -- Mainstream Minerals Corp. (TSX-V:MJO) and King's Bay Gold Corp. (TSX-V:KBG) are pleased to announce that they have received more results from their Phase 1 diamond drilling program on their Bobjo Mine Project, located in Earngey Township, Red Lake, Ontario.

The partners are pleased to report that Hole #14 has intersected a new gold zone returning 1.56 opt gold over 8 feet (53.61g/t Au over 2.45 metres). Specks of visible gold were observed in this intersection. The partners are also waiting for the results from a 40 ft heavily mineralized quartz carbonate zone that was intersected deeper in this hole. The mineralization is mainly comprised of pyrite, pyritite and some chalcopyrite. It has been sent to SGS Canada Inc.'s laboratory to be analyzed for gold and 32 elements using the ICP method.

A table of full results of Holes #1 through #14 included below:



 Hole        Dip    Interval    Interval    Interval    Au
                      From         To        Metres    (g/T)
 -----------------------------------------------------------
 BJ07-01     -45      1.25       10.00        8.75     2.557
 including            1.50        2.00        0.50     5.056
 and                  4.00        4.50        0.50    15.659
 and                  9.50       10.00        0.50    18.184

 BJ07-02     -60      0.50        7.50        7.00     1.561
 including            3.90        4.40        0.50     2.958
 and                  6.50        7.50        1.00     6.847

 BJ07-03     -85      2.00        6.40        4.40     2.235
 including            2.00        2.50        0.50     6.787
 and                  5.00        5.40        0.40     4.289
                     17.00       17.50        0.50     5.428
                     24.50       25.00        0.50     2.517

 BJ07-04     -45      3.00       13.10       10.10     1.276
 including            8.30       13.10        4.80     2.051
                     14.30       16.10        1.80     1.236

 BJ07-05     -45     12.20       12.80        0.60     1.332
                     14.80       18.70        3.90     1.049
 including           18.20       18.70        0.50     4.448
                     80.40       80.80        0.40     1.656

 BJ07-06     -50      2.00        3.10        1.10    32.950
 including            2.90        3.10        0.20    93.090
                      3.10        3.50        0.40     1.450
                      6.50        8.80        2.30     2.050
                      9.20        9.80        0.60     1.150
                    102.00      102.30        0.30    29.010

 BJ07-07     -60      1.60        2.70        1.10     8.701
 including            2.20        2.70        0.50    20.030
                      5.50        6.50        1.00     1.731
                      9.20       11.0         1.80     3.690
 including            9.20       10.00        0.80     6.290
 and                 10.00       11.00        1.00     1.100
                     13.80       14.20        0.40     1.460
                     65.00       65.30        0.30     3.001

 BJ07-08     -60      1.00        8.50        7.50     1.683
 including            2.20        2.50        0.30     5.001
 and                  8.00        8.50        0.50    12.001
                     13.00       13.30        0.30     1.690
                     67.70       69.00        1.30     2.501

 BJ07-09     -60     12.80       13.10        0.30     2.660
                     13.50       15.00        1.50     6.250
 including           13.50       14.30        0.80    11.301
                     14.30       15.30        1.00     1.060
                     16.30       16.80        0.50     2.140
                     24.00       27.40        3.40     8.450
 including           26.00       27.40        1.40    10.950

 BJ07-10     -50      5.60        6.60        1.00     2.930

 BJ07-11     -50      1.50        3.50        2.00     3.271
 including            1.50        2.00        0.50     8.051
                     12.50       13.00        0.50     5.060
                     89.10       89.50        0.40     1.011
                    191.30      192.00        0.70     2.970

 BJ07-12     -50      0.50        2.50        2.00     4.955
 including            1.50        2.00        0.50     9.711

 BJ07-13     -50                                        NSV

 BJ07-14     -45      0.60        3.05        2.45    53.610
 including            0.60        1.80        1.20   118.88
                     10.60       10.90        0.30     7.040

Both companies are very encouraged with the initial high-grade gold results from this Phase 1 diamond drilling program. Drilling is ongoing and will continue to test areas of this large quartz vein system that is open in all directions and at depth. The partners are also waiting for the assay results of Holes #15 through #20 which will be released immediately upon receipt and verification.

The Bobjo Mine project is located between the former South Bay Zinc / Copper Mine and Uchi Lake Gold Mine. It is comprised of a total of 9 patented and 86 unpatented claim units (3,800 acres). It is noted that an existing power line passes through the southern part of the property and that it is within trucking distance to the Placer Dome / Goldcorp Mill in Red Lake, Ontario.

The joint venture is 50% Mainstream Minerals (TSX-V:MJO) and 50% Kings Bay Gold (TSX-V:KBG) with Mainstream Minerals being the Operator of the project. The samples were analyzed by SGS Canada Inc.'s laboratory in Red Lake, Ontario.

This news release has been verified and approved by Geologist John Archibald, Member Association of Professional Geoscientists of Ontario (APGO) who is the Qualified Person under National Instrument 43-101.

"MJO" Shares Issued & Outstanding: 15,282,589

About Mainstream Minerals

Mainstream Minerals Corporation is a mineral exploration and development company focused on precious metal mining properties with economic potential, with the aim of bringing such properties to commercial production. The Company's portfolio of properties is primarily located in the prolific Red Lake Gold Camp of Northwestern Ontario. The properties include: (i) 50% of the Bobjo Mine project, (ii) 100% of the Dixie Lake North project, and (iii) 50% of the Woman Lake North of South Bay project.

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release. Some of the statements contained in this release are forward-looking statements, such as estimates and statements that describe MJO's future plans, objectives or goals, including words to the effect that MJO's management expects a stated condition or result to occur. Since forward-looking statements address future events and conditions, by their very nature, they involve inherent risks and uncertainties.



            

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