Dia Bras Exploration Inc.

Dia Bras Exploration Inc.

March 23, 2010 17:58 ET

Dia Bras Expands Gold Mineralization at the La Cascada High-Sulfidation Gold Prospect at the Bolivar Property

MONTREAL, QUEBEC--(Marketwire - March 23, 2010) - Dia Bras Exploration Inc. (TSX VENTURE:DIB) is pleased to report the results of continued, detailed sampling and mapping plus X-Ray diffraction studies at the La Cascada high-sulfidation gold prospect of its Bolivar property in Chihuahua State, Mexico. La Cascada is located only 2.5 km south of Dia Bras' support and maintenance facilities at its Cieneguita camp. Although gold mineralization in the area has been known by local prospectors, the extensive area of alteration related to the La Cascada prospect is not recorded on any geologic maps of the region.

"La Cascada is becoming an important project to us," stated Daniel Tellechea, President and CEO, "because continued work has demonstrated that the intensely altered and silicified portions of the area that contain elevated gold values is more extensive than previously thought. This presents a strong possibility that this area could host an important and open-pitable gold deposit. We are aggressively pursuing exploration in this area with the objective of drilling it soon."

Table 1 below shows selected results from samples collected from the more altered rocks at La Cascada. Complete results are given in the accompanying map (http://www.diabras.com/en/newscenter/2010/cascada_sampling.pdf) that shows selected sample locations and alteration patterns (http://www.diabras.com/en/newscenter/2010/cascada_table.pdf).

Table 1: Selected Samples from La Cascada Prospect, Bolivar Property

Sample Width m Type Au g/t As ppm Cu ppm
710024 3.0 Rock chip 0.7 827 220
710028 1.0 Rock chip 0.7 231 334
710039 0.1 Channel 0.6 42 13
710052 1.0 Channel 0.4 14 271
710053 1,5 Rock chip 1.7 32 651
710054 1.5 Rock chip 0.8 28 808
710059 0.8 Rock chip 0.4 212 261
710060 0.4 Rock chip 1.4 65 124
710061 1.0 Rock chip 3.0 346 147
757411 5.6 Channel 0.4 105 358
757413 2.0 Channel 2.1 696 500
757414 2.1 Channel 0.4 43 294
757419 0.8 Channel 0.6 113 407
757424 1.4 Channel 0.5 148 291
757434 3.8 Channel 0.5 73 302
757454 2.0 Channel 1.1 105 40
757456 4.0 Channel 0.5 17 64
757478 2.9 Channel 0.5 81 398

The zone of high-sulfidation gold mineralization is characterized by an extensive zone of strong, advanced argillic alteration of the host andesite extending at least 6 km2 that contains areas of silicification, and the zone is open in several directions. The silicified zones are structurally controlled and occur as concentric zones of silicification expressed by an outer zone of granular silica replacement of andesite, an intermediate zone where silicification has destroyed feldspars and original textures, and a core zone of vuggy silica where all original features of the host rock have been destroyed.

X-ray diffraction analysis conducted by the Servicio Geológico Mexicano's Chihuahua office confirms the presence of hydrothermal clays, the most important of which is pyrophyllite, a clay mineral associated with higher temperature zones in a high-sulfidation gold system. The report may be viewed on Dia Bras' website (http://www.diabras.com/en/newscenter/2010/xrd_report.pdf). In La Cascada, it occurs in outcrops of vuggy silica and advanced argillic alteration.

The La Cascada mineralization has characteristics similar to several multi-million ounce high-sulfidation gold deposits, such as the gold association with structurally controlled vuggy silica zones, the style of alteration zonation, association with copper and arsenic, presence of pyrophyllite, etc. La Cascada is notably similar to the El Sauzal deposit, which is located less than 20 km to the southeast and is on the same regional, NNW-trending major structural zone.

The relationship of gold content and alteration has been confirmed by assay results from the various alteration zones present at La Cascada. The Company's geologists have collected over 61 channel and chip samples within the La Cascada prospect, with the following results:

  1. Only samples collected from zones of silicification and veining exceed 1.0 g/t Au and range up to 15.8 g/t (see press release of January 25, 2010). To date, 16 samples have been collected from silicified and brecciated zones that returned more than 1 g/t Au.
  2. Samples collected from zones of strong advanced argillic alteration with granular silica texture return grades ranging from 0.2-1.0 g/t Au.
  3. Samples collected from zones of moderately-developed advanced argillic alteration return grades of 0.1-0.2 g/t Au.
  4. Samples collected from zones of weak argillic alteration return grades of less than 0.1 g/t Au.

Mapping and interpretation by the Corporation's geologists have resulted in a conceptual interpretation of structural and alteration patterns at La Cascada. The attached section (http://www.diabras.com/en/newscenter/2010/sidra_section.pdf) illustrates their interpretation that the highest-grade zones of silicification and vuggy silica are covered by a thin veneer of rock of advanced argillic alteration, which if correct indicates the potential for open-pitable mineralization. In preparation for drilling La Cascada, the company will conduct an induced polarization/resistivity survey in the near future to determine the locations of high resistivity (strongly silicified) and chargeability (sulfide-bearing) anomalies.

Method of analysis

Samples were prepared at the ALS Chemex lab facility in Chihuahua, Mexico, and analyzed by ICP and AA methods at their facilities in Vancouver, Canada. Diamond drill samples sent for analysis consisted of half NQ-size and BQ-size diamond core split on site, prepared by the 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 ALS Chemex.

Quality control

The quality assurance-quality control (QA-QC) of Dia Bras has been described in detail in both RPA's NI 43-101 reports of December, 2006, at Cusi and October, 2005, for Bolivar.

The technical content of this news release has been approved by Thomas L. Robyn, Ph.D., CPG, RPG, a Director of Dia Bras, a Qualified Person as defined in NI 43-101.

About Dia Bras

Dia Bras is a Canadian exploration mining corporation focused on precious and base metals in Chihuahua State and other areas of northern Mexico. The Corporation is committed to developing and adding value to its most advanced assets – the Bolivar copper-zinc project and the Cusi silver mining camp. The Corporation's shares trade on the TSX Venture Exchange under the symbol "DIB". 

For further information on Dia Bras Exploration Inc. visit www.diabras.com

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.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

Contact Information

  • Dia Bras Exploration Inc.
    Daniel Tellechea
    President & CEO
    514-393-8875 ext. 241
    Dia Bras Exploration Inc.
    Karl J. Boltz
    Vice President, Corporate Development