Dia Bras Exploration Inc.
TSX VENTURE : DIB

Dia Bras Exploration Inc.

December 19, 2007 10:40 ET

Dia Bras: High Grade Ore Zones Developed at the Santa Edwiges Mine of the Cusi Project

MONTREAL, QUEBEC--(Marketwire - Dec. 19, 2007) - Dia Bras Exploration Inc. (TSX VENTURE:DIB) is pleased to report results from its ongoing underground exploration and development program at the Santa Edwiges mine on the Cusi property, located in the State of Chihuahua, Mexico.

The Company has been extending its underground development works to reach the downward extensions of the 085 and Rampa 282 mineralized zones, which are within the upper transition zone between oxidized and reduced levels of the mine (refer to attached longitudinal section). The 085 zone has now been cut on three levels, and assay results have been returned for samples collected on the upper two levels. Results show high grades of silver, lead and zinc in the zone, which is being developed for pilot mining.

"These results are an exciting development for us," stated Daniel Tellechea, President and CEO. "We know from test milling of mineralized rock from the 085 zone at our Malpaso mill that we can produce commercial silver-gold-lead concentrates. A test lot of 128 tonnes of silver-gold-lead concentrates from this zone assaying 3,472 g/t silver, 13.5 g/t gold and 46.7% lead has been shipped to a smelter. The volume of mineralization being developed and prepared for pilot mining from this zone and the others along the Santa Edwiges drift positions Dia Bras to be a silver producer during 2008."

The upper level mineralization of the 085 zone is exposed over a width of 6 metres and a length of 60 metres. It was sampled along 4 lines, with the following results:



----------------------------------------------------
----------------------------------------------------
Line Location Samples Width Ag Pb Zn
(m) g/t % %
----------------------------------------------------
Drift back 1-4 4.7 267 3.1 4.6
----------------------------------------------------
Drift back 14-19 5.3 373 6.7 5.1
----------------------------------------------------
Drift wall 21-27 7.9 331 7.6 4.6
----------------------------------------------------
Drift wall 29-36 12.5 159 4.5 1.9
----------------------------------------------------
----------------------------------------------------


The middle level is also exposed over a width of 6 metres and a length of 60 metres. It was sampled along two lines, with the following results:



----------------------------------------------------
----------------------------------------------------
Line Location Samples Width Ag Pb Zn
(m) g/t % %
----------------------------------------------------
Drift back 107-110 6.1 635.9 3.8 3.0
----------------------------------------------------
Drift back 154-157 4.8 282.0 1.1 1.4
----------------------------------------------------
----------------------------------------------------


Assay results for the lowest level as well as some samples from the upper level are pending.

In addition to the results from the 085 zone, results have been received from a muck sample collected in the Rebaje 219 zone along the 0 level drift. The results are as follows:



---------------------------------------------------------
---------------------------------------------------------
Muck Location Sample Width Ag Pb Zn
(m) g/t % %
---------------------------------------------------------
Stope 219 Muck not applicable 220 2.0 2.0
---------------------------------------------------------
---------------------------------------------------------


Another mineralized zone, the Rampa 282 zone, is located closest to the mine portal. Assay results from the Rebaje 282 zone on the 0 level are as follows:



----------------------------------------------------
Line Location Samples Width Ag Pb Zn
(m) g/t % %
----------------------------------------------------
Fte. 306N back 104-106 2.6 651 5.6 0.2
----------------------------------------------------
Fte. 307N back 49-51 3.4 107 0.5 0.2
----------------------------------------------------
"52-54 2.7 200 0.4 0.2
----------------------------------------------------
"61-62 2.4 151 0.8 1.2
----------------------------------------------------
"63-65 2.7 143 0.5 0.1
----------------------------------------------------
RPA-314N back 10-11 1.8 392 0.9 0.3
----------------------------------------------------
"12-14 3.2 287 0.6 0.1
----------------------------------------------------
"15-18 3.1 123 1.1 0.6
----------------------------------------------------
"19-22 3.2 513 2.1 0.6
----------------------------------------------------
"23-26 3.5 673 2.2 1.1
----------------------------------------------------
"27-30 3.3 293 1.6 1.4
----------------------------------------------------
"31-33 3.0 242 1.5 1.0
----------------------------------------------------
"34-36 2.3 1,003 2.9 1.4
----------------------------------------------------


Additional sample results are pending.

The Rampa 282 zone splays into at least three parallel veins and breccia zones (Fte. 306N, Fte. 307N & RPA 314N) that are each 2-3 metres wide, and each has been exposed along a length of 15 metres on the portal level. The downward extension of this zone is interpreted to have been intercepted by diamond drill hole DC07B091 as shown in the longitudinal section (assay results reported in press release dated May 10, 2007 and shown in table below). The three subzones intercepted in hole DC07B91 are the down-plunge equivalents of these splays. These results indicate a downward plunge length of the zone of at least 100 metres, an indication that significant volumes of mineralized rock can occur at depth not only in this zone but also in Rebaje 219 and 085 zones.

The 085 zone is totally within the transition zone and its samples contain higher Pb and Zn values because the zone is only partially oxidized. The Rampa 282 samples were collected from the bottom part of the oxidized zone, consequently the Pb and Zn values are lower because their sulphide minerals have been destroyed by weathering (oxidation). The deeper parts of Rampa 282 contain higher Pb and Zn contents, as evidenced by the results from hole 91.



Results from drill hole DC07B91 (reported May 10, 2007)

----------------------------------------------------
From To Width Au Ag Cu Pb Zn
(m) g/t g/t % % %
----------------------------------------------------
197.0 237.5 40.5 0.07 101 0.1 1.8 2.1
----------------------------------------------------
incl. 197.0 203.0 6.0 0.20 336 0.1 2.1 1.3
----------------------------------------------------
and 212.0 216.5 4.5 0.20 217 0.2 3.8 2.2
----------------------------------------------------
and 230.0 237.5 7.5 0.10 119 0.2 5.1 8.4
----------------------------------------------------


Development continues in order to access deeper levels of these mineralized zones.

Method of analysis

Chip, chip-channel and panel-chip samples from the underground faces of the workings were analyzed at the Nichromex lab facilities in Malpaso, Chihuahua, owned by Dia Bras Mexicana. Samples were analyzed for Au, Ag, Cu, Pb and Zn by AA. Samples with Ag values greater than 100 g/t were reanalyzed by FA. Selected samples analyses at the Dia Bras Nichromex (Malpaso) laboratory facilities are sent to Chemex Vancouver laboratory for check assays.

Quality control

The quality assurance-quality control (QA-QC) of Dia Bras has been described in detail in Roscoe Postle Associates' 43-101 report of December 2006 on Cusi.

The technical content of this news release has been approved by Francois Auclair, P. Geo. and Vice-President, Exploration 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".

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 longitudinal section is available at the following address: http://www.ccnmatthews.com/docs/longitudinal_1219.pdf

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

Contact Information

  • Dia Bras Exploration Inc.
    Thomas L. Robyn
    Executive Chairman
    514-393-8875 ext. 241
    or
    Dia Bras Exploration Inc.
    Daniel Tellechea
    President & CEO
    514-393-8875 ext. 241
    www.diabras.com
    or
    Sun International Communications
    Nicole Blanchard
    Managing Partner
    450-973-6600