MONTREAL, QUEBEC, Jun 02, 2010 (MARKETWIRE via COMTEX) — Dia Bras Exploration Inc. (“Dia Bras” or “the Company”) (CA:DIB) is pleased to report further progress on 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.
Daniel Tellechea, President & CEO commented: “These early results from our mapping and sampling programs are very encouraging, and the company is advancing the La Cascada exploration program as rapidly as practicable. This project has exciting potential, and we eagerly anticipate the first drilling, which is scheduled for mid-July.”
Preparation for Geophysical Survey
All necessary lines have been cut for the layout of cables for the Titan 24 DCIP survey that will be conducted at the La Cascada and Bolivar Pilot-mine areas of the Bolivar Property. A road has been constructed to provide access to key areas of La Cascada.
The geophysical equipment and crew are expected to arrive at the Company’s Cieneguita camp between June 6 and June 10. The survey is expected to be completed by mid-July, depending on weather conditions.
Geologic mapping coverage was expanded in the area to provide a base for interpretation of the geophysical results, and continues to identify outcrops of hydrothermal angular breccia containing partially-rotated fragments cemented by hydrothermal silica with fine pyrite and quartz. Andesitic fragments are altered, mainly silicified and show partial vuggy texture. Faults connecting the La Sidra and La Cascada areas exhibit the best mineralized zones and form tectonic breccias where gold values range between 3 and 7 g/t. These faults are interpreted to have been the feeder structures for gold mineralization in the area. Property access is difficult in the area due to extremely rugged terrain, which results in restricted mapping and sampling coverage, but the company has identified several anomalous areas that will be the initial focus of the geophysical surveys. Two interpretive sections are available at the following link:
http://media3.marketwire.com/docs/LaCascada_Location_Map.pdf
http://media3.marketwire.com/docs/LaCascada_Interpretive_Cross_Section.pdf
http://media3.marketwire.com/docs/LaSidra_Interpretive_Cross_Section.pdf
Trench sampling was done within the advanced argillic alteration zone at the La Sidra shear zone, with 60 samples collected. The samples are generally low in gold, reflecting the fact that the samples were collected outside the core zone of silicic & vuggy silica alteration, but are consistent with the results of previous sampling elsewhere in the same alteration zone. Maximum values returned were 0.49 ppm gold, 36.9 ppm silver, 927 ppm arsenic, 3800 ppm copper, 147 ppm molybdenum, 2620 ppm lead and 8590 ppm zinc, which are highly anomalous and consistent with this portion of the alteration zone. 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. Complete results are available in the annexed table, at the following address: http://media3.marketwire.com/docs/La_Sidra_trench_samples.pdf
Results of Stream Sediment Sampling
The Company has completed an orientation stream-sediment survey in the immediate vicinity of the La Cascada project, the results of which will assist in interpretation of stream sediment sampling not only in the remainder of the Bolivar and Luz de Oro properties, but at other Dia Bras properties in the region, such as Batopilas, as the Company expands its regional gold exploration effort.
The pink areas shown in the annexed map are where gold has been sampled in outcrop, which in some areas like Reyna de Oro and La Cascada, return assays of up to 15 g/t gold. The streams draining these areas were expected to be very anomalous in gold, as is shown by the assay results. Gold values as high as 1.5 ppm gold are reported. Note that the streams draining the known gold mineralized areas are highly anomalous, while samples 710113 and 710112, for example, contain very low gold contents. These results demonstrate that this sampling methodology will allow quick and inexpensive identification of gold-anomalous areas in other parts of the property, as well as other regions in the Sierra Madre region of Chihuahua and Sonora States, and will be a valuable tool for the Company’s regional gold exploration programs.
http://media3.marketwire.com/docs/LaCascada_High_Sulphidation_System.pdf
La Cascada Target Summary
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. The zone is open in all 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.
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.
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. Samples sent for analysis were 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) program employed by 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 company focused on precious and base metals in Chihuahua State and other areas of northern Mexico. The Company is committed to developing and adding value to its most advanced assets – the Bolivar copper-zinc project and the Cusi silver mining camp. The Company’s shares trade on the TSX Venture Exchange under the symbol “DIB”.
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.
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.
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