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Dia Bras Samples up to 5,140 g/t Silver at La Reina Sector, Southern Cusi Silver District
Montréal, Québec, - May 30, 2008 -
Dia Bras Exploration Inc. is pleased to report results from its large-scale exploration program for the La Reina sector of its Cusi property, located in the State of Chihuahua, Mexico.
A wide-scale prospecting, mapping and sampling program was undertaken in March and April in the La Reina sector of the Cusi property. The program has revealed the presence of a number of gold-silver veins and breccias both from known historical producers and from zones unexplored in the past. In total, 446 samples were taken and sent for analyses. Assays have been received for 429 samples at the moment (96.0%). Eight samples returned values greater than 1,000 g/t Ag, 16 with values over 500 g/t Ag, 40 values above 300 g/t Ag and more than 188 samples (42%) returned results exceeding 100 g/t.
The highest grade sample came from the La Reina structure, which assayed 5,140 g/t Ag, 1.67 g/t Au and 7.64% Pb. The sample is from a brecciated quartz stringer with chlorite, limonite and manganese oxide. The most impressive results came from the El Zorro area, where a series of chip and channel samples revealed high gold and silver, with one chip sample assaying 31.5 g/t Au and 490 g/t Ag, with traces of copper, zinc and lead. This sample was collected in a highly fractured quartz stockwork with limonite coating.
E
igh-grade precious and base metal assays were further observed in samples from the Coyote sector where a
1.0-metre chip channel sample yielded 12.1 g/t Au, 1,500 g/t Ag, 0.06% Zn, 0.02% Cu and 0.10% Pb while a
1.3-metre channel sample assayed 16% Zn, 0.47% Cu, 0.22% Pb, 45 g/t Ag and 0.06 g/t Au. A grab sample in the old muck pile yielded a spectacular 10.90% Zn, 12.45% Cu, 0.26% Pb, 114 g/t Ag and 0.22 g/t Au.
These results are very encouraging, and a drill program is planned for the fall of 2008 to follow up on these excellent results.
Geology of the La Reina Sector
The Buenos Aires sector of the southeastern Cusi property is dominantly underlain by Eocene and Oligocene rhyolite and rhyolitic welded tuff deposits that are locally interbedded with andesitic flows and tuffs. The layered rocks dip shallowly northeast, with thicknesses varying from 100 to 300 metres. Rocks are thrust to the southeast and affected by north, north-northeast, northeast and late northwest-trending fault systems very similar to the fractures occurring in the Cusi area.
Major historically mined zones are related to north, north-northeast and northeast fracturing and restricted to the easternmost part of the Buenos Aires area. This area has been mapped and sampled in detail. It displays minor isolated mineralized zones related to similar fracture orientations. These zones are: Reina/Princesa, Lola, Coyote/Zorro and Mina Grande.
The La Reina sector is a north and north-northeasterly trending fractured, brecciated and silicified zone, up to 50 metres wide by 400 metres long. Samples in the La Reina sector were collected along and across the main vein system and some muck samples from the historical working were also collected.
The Princesa sector shows a north-trending silicified, quartz brecciated zone, up to 3 metres wide by 250 metres long, with two secondary parallel zones 50 metres to the east, up to 1-3 metres wide and 50 metres long.
Historically, these two sectors were the most active and display the most important infrastructures.
In the Lola sector, a northeast-trending quartz brecciated zone up to 2 metres wide and 120 metres long has been mapped, while in the Coyote sector east-northeast and northeast-trending quartz brecciated zones up to 2 metres wide and 300 metres long have been observed.
In the Zorro sector, a north-trending quartz zone up to 1-2 metres wide and 150 metres long occurs, while in the Mina Grande, a northeast-trending fluorite-quartz brecciated zone occurs, up to 2 metres wide and 200 metres long.
The Negrita zone presents different structural patterns displaying fluorite-quartz filled fractures. Some samples were collected in the small Trini pit that displays north-trending limonite-quartz, while other samples were collected from the small Illusion pit where north-northeast amethyst veins parallel to andesitic dyke were observed.
Results are displayed in the table at the end of this press release.
Best sample results from the La Reina area, Cusi property
Reina Area |
|||||||||
Samples |
Type |
Length |
UTM- |
UTM- |
Au |
Ag |
Pb |
Zn |
Cu |
DC08JP011-C |
Chip |
- |
330407 |
3115167 |
0.91 |
1010 |
0.19 |
0.65 |
0.32 |
DC08JP011-D |
Grab |
- |
330406 |
3115165 |
0.86 |
1000 |
0.26 |
0.98 |
0.45 |
DC08JP011-E |
Grab |
- |
330406 |
3115166 |
0.70 |
1010 |
0.26 |
0.98 |
0.32 |
DC08JP011-F |
Grab |
- |
330406 |
3115167 |
1.67 |
5140 |
0.13 |
7.64 |
0.22 |
DC08JP065-M4 |
Cruz |
2x2 |
330388 |
3115040 |
0.04 |
216 |
0.04 |
0.18 |
0.18 |
DC08JP065-M6 |
Cruz |
2x2 |
330392 |
3115040 |
0.03 |
209 |
0.03 |
0.11 |
0.07 |
DC08JP065-M9 |
Cruz |
2x2 |
330393 |
3115035 |
0.03 |
228 |
0.03 |
0.14 |
0.07 |
DC08JP065-M10 |
Cruz |
2x2 |
330391 |
3115033 |
0.03 |
202 |
0.03 |
0.11 |
0.08 |
DC08JP065-M11 |
Cruz |
2x2 |
330394 |
3115032 |
0.03 |
200 |
0.03 |
0.12 |
0.07 |
DC08JP065-M12 |
Cruz |
2x2 |
330382 |
3115023 |
0.03 |
214 |
0.03 |
0.11 |
0.07 |
Princesa Area |
|||||||||
Samples |
Type |
Length |
UTM- |
UTM- |
Au |
Ag |
Pb |
Zn |
Cu |
DC08JP069-B |
Chan |
0.3 |
330442 |
3116063 |
0.02 |
269 |
0.06 |
0.06 |
0.11 |
DC08JP069-C |
Chan |
0.25 |
330443 |
3116070 |
0.03 |
306 |
0.12 |
0.28 |
0.30 |
DC08JP071-A |
Chan |
0.4 |
330445 |
3116092 |
0.01 |
206 |
0.02 |
0.20 |
0.05 |
DC08JP071-B |
Chan |
0.2 |
330444 |
3116095 |
0.01 |
298 |
0.04 |
0.26 |
0.17 |
DC08JP071-C |
Chan |
0.4 |
330444 |
3116097 |
0.08 |
520 |
0.12 |
0.60 |
0.34 |
Lola Area |
|||||||||
Samples |
Type |
Length |
UTM- |
UTM- |
Au |
Ag |
Pb |
Zn |
Cu |
DC08JP081-A |
Grab |
- |
330184 |
3117606 |
0.03 |
275 |
0.03 |
0.13 |
0.16 |
DC08JP081-B |
Grab |
- |
330182 |
3117608 |
0.03 |
263 |
0.04 |
0.31 |
0.14 |
DC08JP082-A |
Chan |
0.5 |
330188 |
3117620 |
0.05 |
595 |
0.06 |
0.21 |
0.15 |
DC08JP082-B |
Chan |
0.7 |
330187 |
3117620 |
0.01 |
114 |
0.02 |
0.11 |
0.15 |
DC08JP082-C |
Grab |
- |
330186 |
3117620 |
0.02 |
349 |
0.02 |
0.09 |
0.14 |
DC08JP082-D |
Grab |
- |
330185 |
3117621 |
0.02 |
845 |
0.08 |
0.10 |
0.29 |
Lola Top Area |
|||||||||
Samples |
Type |
Length |
UTM- |
UTM- |
Au |
Ag |
Pb |
Zn |
Cu |
DC08JP083-A |
Chan |
0.4 |
330203 |
3117633 |
0.04 |
225 |
0.03 |
0.10 |
0.11 |
DC08JP083-B |
Grab |
- |
330200 |
3117630 |
0.02 |
358 |
0.05 |
0.16 |
0.22 |
DC08JP083-C |
Grab |
- |
330205 |
3117636 |
0.02 |
334 |
0.03 |
0.10 |
0.20 |
DC08JP084-A |
Chan |
0.05 |
330213 |
3117640 |
0.08 |
412 |
0.04 |
0.08 |
0.11 |
El Zorro Area |
|||||||||
Samples |
Type |
Length (m) |
UTM- |
UTM- |
Au |
Ag |
Pb |
Zn |
Cu |
DC08JP107-A |
Chan |
0.1 |
326688 |
3117542 |
8.19 |
336 |
0.01 |
0.04 |
0.02 |
DC08JP107-B |
Grab |
- |
326686 |
3117546 |
6.58 |
246 |
0.03 |
0.04 |
0.01 |
DC08JP108-A |
Grab |
- |
326686 |
3117557 |
6.31 |
1075 |
0.03 |
0.12 |
0.02 |
DC08JP111-A |
Grab |
- |
326696 |
3117431 |
2.17 |
345 |
0.01 |
0.03 |
0.03 |
DC08JP111-B |
Grab |
- |
326698 |
3117430 |
3.32 |
248 |
0.01 |
0.08 |
0.10 |
DC08JPM11-C |
Chan |
0.2 |
326688 |
3117551 |
31.50 |
490 |
0.12 |
0.18 |
0.02 |
Click here to view the full table of assays with the description of all samples taken in the course of this program.
Click here toview the maps of the sector please visit the following link:
Details Mapping |
|
|
# of samples |
Type of Sample |
Codification |
327 |
detailed surface |
DC08JP**-* |
95 |
detailed mine |
DC08JPM**-* |
12 |
reconnaissance sampling |
DC08JPR** |
434 |
total detailed samples |
|
Regional Mapping |
|
|
# of samples |
Type of Sample |
Codification |
12 |
detailed surface |
DC08AC**-* |
Method of analysis
Samples were prepared at Chemex lab facility in Chihuahua, Mexico, and analyzed by ICP and AA methods by Chemex at their facilities in Vancouver, Canada.
Grab and chip-channel samples sent for analysis consist of 2- to 5-kilo samples (averaging 3.5 Kg), prepared by ALS Chemex sample preparation laboratory in Chihuahua, Mexico, and assayed for Au by 50 g fire assay with AA finish and for Ag by AA on 50 g split sample at the ALS Chemex North Vancouver Laboratory. Assays for Pb, Zn and Cu are done by Induction Coupled Plasma (ICP) at Chemex.
Quality control
The quality assurance-quality control (QA-QC) of Dia Bras has been described in detail in both of Roscoe Postle Associates’ 43-101 reports of December 2006 at Cusi.
The technical content of this news release has been approved by François 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 mining and exploration company focused on precious and base metals in Mexico. The Company is committed to developing and adding value to its assets – the Bolivar copper-zinc project, the Cusi silver mining camp in the renowned Sierra Madre mining district of northern Mexico, and La Engañosa copper-silver property in the State of Jalisco. The Company trades on the TSX Venture Exchange under the symbol “DIB”.
For further information on Dia Bras, visit www.diabras.com or contact:
Daniel Tellechea |
|
François Auclair |
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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 that 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.
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