Dia Bras Exploration Inc.
TSX VENTURE : DIB

Dia Bras Exploration Inc.

January 22, 2007 08:45 ET

Dia Bras: High Silver Grades at Cusi

La India and Santa Edwiges mines yield high silver values

MONTREAL, QUEBEC--(CCNMatthews - Jan. 22, 2007) - Dia Bras Exploration Inc. (TSX VENTURE:DIB) is pleased to announce additional high-grade silver values from its Cusi property in the State of Chihuahua, Mexico. Re-assay of drill core yielded 35.4 Kg/t Ag over 0.4 meters from La India. In addition, channel sampling in Santa Edwiges yielded 2.7Kg/t Ag over 3.62 meters. Both of these mines are owned 100% by the Company.

LA INDIA

On October 3, 2006 the Company announced a drill intersection of 1.4 meters grading over 10,000 g/t Ag (greater than 10 Kg/t) from the drilling program at La India. Over-assay data by Chemex reveals two matters of interest: 1) the Ag content of the drill intercept is 35,442 g/t Ag (35.4 Kg/t); and, 2) the lab reversed the Company's sample numbers, and the drill intercept is 0.4 m, not 1.4 m. The sample interval is 200.4 to 200.8 meters from drill hole DC06B012.


SAN EDWIGES

The Santa Edwiges channel sample is one of 28 collected from a structure exposed in a crosscut on the first level of the mine in an area that is being developed for early bulk sampling. Material from the bulk sample will be trucked to the Company's mill at Malpaso, a distance of 38 km, and will be processed in the mill's new 500 tpd circuit. In total, 28 channel samples averaged 334.3 g/t Ag, 1.01% Pb and 0.30% Zn, as shown in the table below. The true width of the sampled structure is 10 meters, and the various samples were collected around the gallery.


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Sample Ag Pb Zn Cu Width
(g/t) (%) (%) (%) (m)
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681223 120 1.6 0.26 not reported 3.70
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681224 170 1.2 0.18 not reported 3.80
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681225 180 0.75 0.57 not reported 3.50
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681235 60 1.1 0.26 not reported 1.50
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681236 450 0.76 0.23 not reported 3.38
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681237 120 0.61 0.21 not reported 1.61
--------------------------------------------------
681249 310 1.12 0.1 not reported 3.60
--------------------------------------------------
681250 260 0.8 Ind. not reported 3.45
--------------------------------------------------
681251 2700 2.67 0.58 not reported 3.62
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681253 530 1.94 0.05 not reported 1.41
--------------------------------------------------
681254 520 2.91 0.03 not reported 3.53
--------------------------------------------------
681255 150 0.99 Ind. not reported 1.36
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681259 220 0.94 0.15 not reported 1.00
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681260 110 1.03 0.05 not reported 3.50
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681275 110 0.7 0.39 not reported 1.50
--------------------------------------------------
681276 130 0.86 0.32 not reported 1.93
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681279 110 0.53 2.9 not reported 1.55
--------------------------------------------------
737534 1400 0.81 0.18 0.04 2.84
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737535 350 1.31 0.25 0.2 2.50
--------------------------------------------------
737546 110 0.48 0.14 0.05 1.80
--------------------------------------------------
737548 190 0.89 0.15 0.05 1.92
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737563 420 0.32 0.18 not reported 2.47
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737564 240 1.11 Ind. not reported 5.00
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737565 70 1.2 0.09 not reported 4.00
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737631 40 0.17 0.01 not reported not recorded
--------------------------------------------------
737632 130 0.72 0.01 not reported not recorded
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737645 30 0.26 0.11 not reported not recorded
--------------------------------------------------
737647 130 0.41 0.03 not reported not recorded
-----------------------------------------------------------
No./Avg. 28 334.29 1.01 0.30
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SURFACE MAPPING

Mapping by the Company's geologists demonstrates that the La India-San Miguel-La Bamba mines are separated from the Santa Edwiges-Santa Marina-Promontorio mines by a NW-trending fault that has uplifted the Santa Edwiges block relative to the La India block. The silver-rich precious metals portion of the Santa Edwiges block, therefore, has been eroded and the veins exposed on the surface and in the shallow mine workings are from the base metals portion of the zoned vein system. However, as shown in the table above, high silver values are commonly found associated with base metals in that portion of the system.

The Company has received a report on the mineralogy of veins in the Santa Edwiges block from its consultant Prof. Larry Meinert, the conclusions of which are consistent with the interpretation that the Santa Edwiges block, containing the Mexicana vein and the San Antonio vein, is in the upper base metal portions of the vein system. He writes:

"Veins in the Cusihuiriachic district consist of banded, crustiform, and brecciated quartz with bands, disseminations, and massive zones of sulfide-rich ore. Except for supergene oxidized and enriched ore, such as at La India, sphalerite and galena are present in all ore zones. Thus, the Cusihuiriachic district should be thought of as a high level base metal vein system that overlies or is peripheral to a buried intrusion. This intrusion may be mineralized and the presence of carbonate rocks in the sub-surface makes the presence of skarn ore likely.

"The sulfide mineralogy of the Cusihuiriachic veins is relatively simple with major sphalerite and galena, with minor pyrite and locally chalcopyrite (mainly as inclusions in sphalerite). Although looked for, no discrete Ag minerals were found by petrographic, XRD, or SEM analysis. Silver assays ranged from 104-474 ppm, for hand selected high-grade samples."

Dia Bras acquired the Cusi district only eight months ago. This district includes 12 inactive mines that have very promising potential since they have never been explored at depth. The Company is exploring multiple silver-rich vein targets, some of which are open-pitable such as La Bamba and some are base metal and skarn replacement deposits. The program of surface mapping and sampling, surface core drilling, and underground mapping and sampling is well underway. The San Miguel and Promontorio mines are being de-watered, and the lower levels are expected to be free of water in February 2007. These levels will then be cleaned and rehabilitated, surveyed and sampled to confirm the presence of mineralized blocks reported in historical mine records.

Method of analysis

The samples from La India were analyzed by ICP and AA methods by Chemex at their facilities in Vancouver, Canada. The samples from San Edwiges were analysed by AA methods at the Malpaso Mill.

The technical content of this news release has been approved by André St-Michel, engineer and Executive Vice-President of Dia Bras, a Qualified Person as defined in NI43-101.

About Dia Bras

Dia Bras is a Canadian exploration mining company focused on precious and base metals in the State of Chihuahua, in northern Mexico. The Company is committed to developing and adding value to its assets - the Bolivar copper-zinc project and the Cusi silver mining camp. The Company trades on the TSX Venture Exchange, under the symbol "DIB".

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

Contact Information

  • Dia Bras Exploration
    Thomas L. Robyn
    Executive Chairman
    (514) 393-8875 ext. 241
    or
    Dia Bras Exploration
    Rejean Gosselin
    President
    (514) 393-8875 ext. 241
    or
    Sun International Communications
    Nicole Blanchard
    Managing Partner
    (450) 627-6600