Dia Bras Intersects a Wide Mineralized Zone With Bonanza Silver Grades at Its Cusi Property
TORONTO, ONTARIO -- (Marketwire) -- 09/14/11 -- Dia Bras Exploration Inc.(TSX VENTURE: DIB)('Dia Bras' or the 'Company') is pleased to report that exploration drilling from surface at Santa Eduwiges and Promontorio mines (Figure 1: http://www.diabras.com/files/media/76cf8_NR%20No%2030%20Vein%20map%20of%20La%20India%20to%20San%20Juan.png) has encountered wide zones of silver mineralization. The Company has recently focused its efforts on the Santa Eduwiges - Promontorio portion of the property, where multiple, silver-dominant veins intersect.
Twenty-two drill holes have been completed, for which assay results have been received for five holes. An additional nine holes are planned. Of particular interest is the intercept in drill hole 363, which is a zone of silicified rhyodacite with disseminated argentite. It is a sulphide-poor interval with minor quartz veinlets and is a newly recognized type of mineralization at Cusi that indicates the potential for underground bulk mining. The table below presents significant results from the five holes.
Table of Significant Drill Intercepts at Promontorio and Santa Eduwiges
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Core
Hole Number Area From (m) To (m) Length (m) Au g/t Ag g/t Pb % Zn %
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DC11B363 Promontorio 107.2 133.6 26.4 (i) 266 0.18 0.25
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incl. 129.15 132.30 3.05 (i) 1250 0.19 0.18
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incl. 129.70 131.50 1.80 (i) 2060 0.29 0.25
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DC11B374 Promontorio 325.1 326.0 0.9 0 194 0.04 0.09
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346.5 351.3 4.8 0 463 0.21 0.25
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348.7 350.1 1.4 (i) 1170 0.14 0.15
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350.1 351.3 1.2 (i) 257 0.28 0.28
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DC11B376 Santa Eduwiges 55.65 56.40 0.75 0.35 223 1.00 2.44
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DC11B379 Promontorio 223.15 224.00 0.85 0.34 211 0.35 0.32
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226.35 227.45 1.1 0.43 130 0.64 1.38
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248.10 249.25 1.15 0.08 357 0.53 0.34
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259.30 259.95 0.65 0.03 113 0.38 0.37
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270.6 271.6 1.0 0.01 125 0.24 0.21
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280.55 280.80 0.25 0.55 467 2.77 5.79
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DC11B380 Promontorio 125.30 126.15 0.85 0.01 408 0.22 0.23
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141.20 142.05 0.85 0.02 192 0.19 0.32
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155.95 160.05 4.1 0.02 194 0.22 0.21
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157.3 158.0 0.7 0.04 441 0.27 0.20
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177.7 179.3 1.6 0.00 399 0.34 0.42
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193.2 198.95 5.75 0.05 149 0.29 0.32
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incl. 194.65 196.1 1.45 0.03 224 0.06 0.10
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incl. 197.55 198.95 1.4 0.12 205 0.85 0.91
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(i) not assayed
Pilot-Mining
As part of its pilot-mining program, the Company has been sending mineralized rock from Santa Eduwiges to its 100% owned Malpaso Mill, which is located only 40 km by road from the mine. Pilot-mining provides important information on metallurgy, recovery rates, mining and milling costs, etc., that are essential in determining the economic viability of a project.
During the month of August 2011, for example, the Malpaso Mill processed 3,196 tonnes of rock averaging 190 g/t silver, 0.64% lead and 1.04% zinc, which illustrates the silver-rich nature of the Cusi mineralization. Mill recovery of silver averages 80-85% using a combination of flotation and cyanide vat-leach methods. The Company produces silver-rich lead concentrate and silver dore.
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 analyzed 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 and Qualified Person as defined in NI 43-101.
About Dia Bras
Dia Bras Exploration is a Canadian mining & exploration company focused on precious and base metals in Chihuahua State, other areas of northern Mexico, and most recently at its newly-acquired silver-lead-zinc-copper-gold Yauricocha mine in Peru. The Company is accelerating exploration at the Yauricocha property as well as pursuing the development and exploration of its most advanced Mexican assets - the Bolivar Property (copper-zinc-silver) and the Cusi Property (silver) and is exploring several precious and base metal targets in Peru and Mexico.
The Company'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.
Contacts:
Daniel Tellechea
President & CEO
Dia Bras Exploration Inc.
1 (866) 493-9646
Robert Hirsh
Director, Corporate Development
Dia Bras Exploration Inc.
1 (866) 493-9646