Dia Bras Exploration Inc.
TSX VENTURE : DIB

Dia Bras Exploration Inc.

September 13, 2007 08:00 ET

DIA BRAS Intersects High Grade at the Promontorio Silver Mine in the Cusi Silver District

MONTREAL, QUEBEC--(Marketwire - Sept. 13, 2007) - Dia Bras Exploration Inc. (TSX VENTURE:DIB) is pleased to announce more high grade silver intersections from its ongoing drill program on the Cusi property, located in the State of Chihuahua, Mexico.

These results are highly encouraging in light of the on-going 25,000-metre diamond-drilling program, with more than 13,500 metres of core drilling completed to date in the Cusi District. Additional drilling will aim at defining the resource potential of the major Ag (Zn-Pb) vein/breccia structures of the Promontorio, Santa Marina - San Antonio and Santa Edwiges mines, all historical producers.

PROMONTORIO SECTOR:

"With the acquisition of the entire Cusi Silver district, encompassing some 100 sq. km, we took the major task to explore it; we have recently decided to focus on four interconnecting former mines - the San Edwiges - Promontorio Sector - and rehabilitate the old workings in order to assess their potential", said Rejean Gosselin, President and CEO of Dia Bras.

The high-grade Promontorio sector is of particular interest, where Dia Bras is conducting a drilling program directed at identifying resources within historical workings (see press release of June 19, 2007) and further identifying new targets with the help of the on-going surface mapping and sampling program.

The area is situated in an extensional system, where a series of NE-SW faults are cut by a NW-SE fault. Furthermore, a set of regional structures, oriented 50 and 80 degrees are present everywhere on the Promontorio area.

Surface geology shows mostly 230 degrees and 310 degrees mineralized zones, near an east-west contact with the andesitic complex affected by tightly spaced, short N-S faults. The zones show limited brecciation and cataclastic deformation and minor alteration. Quartz veining made of millimetric and centimetric veinlets and veins is wide spread.

The WSW oriented and partially mined silver bearing Veta A (1.5 m wide) exhibits major alteration reaching 100 metres. Other mineralized structures do not show this widespread alteration.

EL GALLO VEIN (PROMONTORIO SECTOR)

The El Gallo vein of the Promontorio area is known from historical data (see press release of May 18, 2007). This major structure of the Promontorio area can be followed on surface over a strike length of more than 300 metres, and it is constrained between two NW-SE structures. It is truncated to the north by the Cusihuiriachic fault and to the south by the major Promontorio 310 degrees structure.

On the NE side of the N310 fault, the El Gallo structure is a quartz vein (10 to 40cm) containing centimetric breccia fragments and quartz veinlets-stockwork (1 to 2m). This structure trends approximately N055/75 degrees, and is visible on surface for almost 100m. On the SW side of the N310 fault, the Gallo structure is a highly-fractured zone (40cm), where the contact is limonite-kaolinite-psylomelane breccia (10-20 cm) with quartz veinlets.



Surface sampling performed in June reveals values of up to 230 g/t Ag with
trace Zn, Pb, and Cu.

Channel Samples
---------------------------------------------------------------------------
Length Au Ag Ag(i) Pb Zn Cu
Samples (m) Summary (g/ton) (g/ton) (g/Ton) (%) (%) (%)
AA FA
---------------------------------------------------------------------------
Vn Qtz Si++
DC077JP187-A 0.1 Fx++ Hm 0.01 211 230 0.25 0.07 0.01
---------------------------------------------------------------------------
Vn Qtz
DC077JP201-A 0.2 (LmMnO) Ind. Ind. 20 Ind. Ind. 0.03
---------------------------------------------------------------------------
Vn Qtz
DC077JP201-B 0.2 (LmMnO) Ind. 145 150 Ind. Ind. 0.04
---------------------------------------------------------------------------
Vn Qtz
DC077JP201-C 0.2 (LmMnO) 0 183 70 0.29 0.01 0.04
---------------------------------------------------------------------------
Vn Qtz
DC077JP201-D 0.25 (LmMnO) Ind. Ind. 20 0.05 0.09 0.02
---------------------------------------------------------------------------
Vn Qtz Bx Vt
DC077JP202 0.25 MnO 0.01 211 230 0.25 0.07 0.01
---------------------------------------------------------------------------
DC077JP210 0.3 Vn Qtz Ind. Ind. 30 0.02 Ind. Ind.
---------------------------------------------------------------------------
DC077JP213 0.1 Vn Qtz Ind. 103 110 0.13 0.05 Ind.
---------------------------------------------------------------------------


The drilling program was successful in intersecting the El Gallo vein at various elevations and confirms a depth extension of more than 250 metres over a strike length of some 300 metres. The structure is still open at depth.

Hole DC07B107 to 109

These three holes were all drilled south of the main Promontorio shaft to test the potential mineralization near surface but did not produce significant results.

Hole DC07B105

This hole was drilled to test the El Gallo vein at level 1925. It intersected 97 g/t Ag over 1.5 metres at 126.5 m down hole. The estimated true width is 1.1 metres. A second intersection of 149 g/t Ag over 1.5 metres was intersected at a down hole depth of 233 m and possibly corresponds to an unidentified structure.

Hole DC07B111

This hole was drilled to test the extension of the El Gallo vein at level 1950. The El Gallo structure was intersected but reveals no mineralization. However, the hole intersected 1.5 metres of 164 g/t Ag between 119.0 to 120.5 metres core length. The estimated true width is 1.1 metres.

Hole DC07B115

This hole was drilled to test the south extension of the El Gallo vein, and intersected three silver bearing veins. One of these veins graded 157 g/t Ag over a core length of 4.5 metres between 174.5 to 179.0.

HOLE DC07B117

This hole was drilled to test the El Gallo vein at level 2000. The hole intersected a number of silver bearing veins. The El Gallo structure was intersected from 63.5 to 66.5 core length, with an average of 217 g/t Ag over an estimated true width of 3 metres. Another zone, some 11.8 metres in true width, averages 115 g/t Ag at a core length of 160 metres.

SAN ANTONIO - SAN MARINA SECTOR

Hole DC07B102

This hole was drilledto test the area between the San Antonio open pit and the Santa Marina underground mine at the 1700 level. The hole intersected numerous zones of weathered and non-weathered (sulfide-bearing) mineralization, the most important being a 4.5 metres interval grading 248 g/t Ag with 0.9% Zn and 0.9% Pb, including a section assaying 628 g/t Ag over 1.5 metres with 1.7% Zn and 1.6% Pb between 160.5 to 165.0 core length. A sulfide-rich interval that assayed 24 g/t Ag, 1.9% Zn and 1.6% Pb was intersected between 342 and 357 metres core length (10.6 metres true width), including a 1.5 metre interval that assayed 140 g/t Ag, 3.9% Zn and 3.8% Pb.

Hole DC07B103

This hole was drilled to test the western part of the San Antonio structure at the 1700 level. The best intersection was 1.5 metre of 99 g/t Ag (estimated true width of 1.1 metre) between 129.0 to 130.5 metres core length.

Hole DC07B110

This hole was drilled to test the eastern part of the San Antonio structure at level 1650. The hole intersected several significant intervals, including 1.5 metres of 320 g/t Ag from 307.5 to 309.0 metres core length, and 266 g/t Ag over 1.5 metres between 409.5 and 411 metres core length. Estimated true width is 1.1 metre.

SANTA EDWIGES SECTOR

Hole DC07B104

This hole was drilled to test the NE section of the Santa Edwiges mine at level 1950 and did not intersect significant mineralization.

Hole DC07B106

This hole was drilled to test the southern section of the Santa Edwiges mine at level 1975, and intersected 2.4% Zn and 1.3% Pb over 3 metres, between 114.5 and 117.5 core length. Estimated true width is 2.2 metres.

Hole DC07B112

This hole was drilled to test the NE part of the Santa Edwiges mine and intersected several zones of mineralization, including a 9.0-metre section between 156.5 to 165.5 metres core length that graded 0.1 g/t Au, 43 g/t Ag, 1.1% Zn and 0.8% Pb, including a richer section of 1.5 metres assaying 0.4 g/t Au, 221 g/t Ag, 1.6% Zn and 0.8 % Pb. Estimated true width is 6.4 metres.



---------------------------------------------------------------------------
Hole From To Interval Au Ag Cu Pb Zn
(g/t) (g/t) (%) (%) (%)
---------------------------------------------------------------------------
DC07B102 160.5 165.0 4.5 0.0 248 0.1 0.9 0.9
160.5 162.0 1.5 0.0 628 0.2 1.6 1.7
327.0 328.5 1.5 0.4 211 0.0 0.3 0.8
342.0 357.0 15.0 0.0 24 0.0 1.6 1.9
343.5 345.0 1.5 0.1 140 0.1 3.8 3.9
354.0 355.5 1.5 0.1 37 0.1 3.3 6.2
366.0 367.5 1.5 0.0 8 0.0 1.6 0.6

---------------------------------------------------------------------------
DC07B103 87.0 90.0 3.0 0.0 38 0.0 0.4 2.0
129.0 130.5 1.5 0.0 99 0.1 0.4 0.9
336.0 337.5 1.5 0.0 14 0.0 0.4 1.0
348.0 349.5 1.5 0.0 25 0.0 0.7 1.2
393.0 394.5 1.5 0.0 6 0.0 0.0 1.6

---------------------------------------------------------------------------
less
than
DC07B105 126.5 128.0 1.5 0.005 97 0.0 0.0 0.0
233.0 234.5 1.5 0.3 149 0.0 0.5 1.0

---------------------------------------------------------------------------
DC07B106 114.5 117.5 3.0 0.2 2 0.0 1.3 2.4

---------------------------------------------------------------------------
DC07B110 468.0 474.0 6.0 0.0 10 0.1 0.6 1.6
520.5 531.0 10.5 0.1 100 0.1 0.6 1.7
307.5 309.0 1.5 0.4 320 0.0 0.1 0.2

---------------------------------------------------------------------------
DC07B111 119.0 120.5 1.5 0.0 164 0.0 0.1 0.2

---------------------------------------------------------------------------
DC07B112 108.5 110.0 1.5 0.0 10 0.0 0.7 1.2
156.5 165.5 9.0 0.1 43 0.0 0.6 1.1
164.0 165.5 1.5 0.4 221 0.0 0.8 1.6
---------------------------------------------------------------------------
DC07B115 126.5 128.0 1.5 0.0 101 0.0 0.1 0.3
174.5 179.0 4.5 0.0 157 0.0 0.6 0.1
---------------------------------------------------------------------------

DC07B117 63.5 66.5 3.0 0.1 214 0.0 0.1 0.1
156.5 168.5 12.0 0.1 115 0.0 0.1 0.1

---------------------------------------------------------------------------


Method of analysis

The diamond core samples were analyzed by ICP, AA and FA methods by Chemex at their facilities in Vancouver, Canada. The grab and channels surface samples were analysed by AA and FA at the Malpaso mill laboratories facilities.

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 newly acquired 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 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
    or
    Dia Bras Exploration
    Rejean Gosselin
    President & CEO
    514-393-8875
    www.diabras.com
    or
    Sun International Communications
    Nicole Blanchard
    Managing Partner
    450-627-6600