Dia Bras Exploration Inc.
TSX VENTURE : DIB

Dia Bras Exploration Inc.

August 05, 2005 08:30 ET

Dia Bras: Six Months of Pilot-Mining at Bolivar

MONTREAL, QUEBEC--(CCNMatthews - Aug. 5, 2005) - Dia Bras Exploration (TSX VENTURE:DIB) announced today the results for the first six months of operation from its pilot-mining program at the Bolivar property.

From February 1, 2005 to July 31, 2005, the Bolivar property produced 27,989 tonnes of Copper-Zinc development ore. Production took place on two levels only, Levels One and Six, and consisted mainly of the cleaning of old stopes and of development mining to access the new high grade zones discovered by drilling. See following results. It is expected that development will reach high grade zones in August and September.




LEVEL 1
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Hole Thickness Au Ag Cu Zn
(m) g/t g/t % %
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DIA-045-04 (i) 1.00 0.10 10.00 0.47 10.95
5.00 0.08 55.00 6.31 37.23
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DIA-052-04 (i) 4.17 0.46 228.08 6.68 19.19
8.00 - 41.95 5.36 3.29
3.00 - 38.20 1.62 7.72
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DIA-054-04 (i) 13.00 - 34.65 3.49 8.60
2.00 0.88 181.55 4.02 12.93
0.95 - 157.00 0.36 4.95
1.00 1.055 126.00 0.67 0.40
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DIA-087-04 (i) 7.00 - 70.45 4.67 28.52
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DIA-071-04 (i) 2.00 0.153 55.35 8.32 3.06
2.00 0.043 19.40 3.70 21.25
1.00 0.431 231.00 3.41 8.50
3.00 0.070 28.03 4.32 18.8
1.00 0.866 245.00 3.22 10.35
3.00 0.447 84.80 2.40 18.10
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DIA-089-04 4.00 0.0625 79.675 1.31 10.467
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DIA-091-04 (i) 2.00 0.044 34.45 2.68 4.58
2.00 0.029 20.65 2.28 7.05
4.00 0.048 45.325 4.88 12.242
4.00 0.163 104.90 3.102 10.27
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DIA 102-04 2.00 0.345 57.80 1.060 12.70
1.45 - 9.60 0.60 21.00
2.75 0.90 115.00 1.64 19.1



LEVEL 6
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Hole Thickness Au Ag Cu Zn
(m) g/t g/t % %
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DIA-046-04 (i) 1.20 0.165 65.80 8.07 38.15
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DIA-055-04 (i) 5.00 - 17.42 2.04 13.54
3.00 - 104.60 5.28 7.75
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DIA-094-04 2.00 - 231.50 4.11 22.30
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DIA-101-04 1.00 - 28.50 1.93 23.40
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(i) Results from holes with an (i) were previously announced.


"The pilot-mining program provides important production cost data for the pre-feasibility study stage," said President Rejean Gosselin. "We believe that the short term cash flow resulting from the production of copper and zinc concentrates will permit self-financing of the development and exploration program at the Bolivar mine and in the Bolivar area."

The capacity of the Malpaso mill has been increased, since its February start-up, from 100 tpd to 300 tpd at which level it is currently running. It processed in the first six months some 20,624 tonnes of ore at average head grades of 1.74% Cu and 7.11% Zn. The recovery achieved during this period was 79.2% for the zinc and 75.1% for the copper. The mill has produced 2,195 dry metric tonnes (DMT) of zinc concentrate and 980 DMT of copper concentrate.

The Company projects, starting in August, 7,500 tonnes per month of ore grading a minimum of 2% Cu and 9% Zn. At the same time, the Company will carry out aggressive exploration programs to expand high grade resources and test skarn-hosted polymetallic targets elsewhere on the property.

The Company is in the process of changing its financial year end to December 31, to facilitate coordination of accounting and reporting activities with its Mexican subsidiaries which have statutory December year ends.

About Dia Bras

Dia Bras is a Canadian mining exploration company focused on precious and base metals in the State of Chihuahua, northern Mexico. The Company continues exploration and the active development of its two key projects - Bolivar and Promontorio - in the world-renowned Sierra Madre mineral belt. The Company trades on TSX Venture Exchange, under the symbol "DIB".

Forward-looking statements:

Except for statements of historical fact, all statements in this news release, without limitation, regarding new projects, acquisitions, future plans and objectives are forward-looking statements which involve risks and uncertainties. There can be no assurance that such statements will prove to be accurate; actual results and future events could differ materially from those anticipated in such statements.

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

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