Dia Bras Intercepts More Wide Zones of Silver-Lead-Zinc-Copper Mineralization at Its Melchor Ocampo Property in Zacatecas State, Mexico
TORONTO, ONTARIO -- (Marketwire) -- 05/10/11 -- Dia Bras Exploration Inc. (TSX VENTURE: DIB) ('Dia Bras' or the 'Company') is pleased to report that it has received additional assay results from diamond drill holes #7 through #12 of its drilling program at its 100% controlled Las Coloradas project in the Melchor Ocampo mineral district, Zacatecas State. Four of these six holes intercepted wide zones of silver-lead-zinc-copper mineralization in skarnified limestone.
'These latest drill holes bring to seven out of twelve the number of drill holes to intersect potential bulk-tonnage mineralization at Las Coloradas target. These seven holes are in the same area, the western and central portions of the drilled area, and indicate that Las Coloradas is a large mineralized system,' stated Daniel Tellechea, President & CEO. 'We are compiling and interpreting the drill data and plan to drill additional holes in the third quarter of this year to outline a significant tonnage of potentially-economic mineralization. We expect to commission a NI 43-101 compliant study after our next round of drilling.'
The Las Coloradas project is located in the Melchor Ocampo mineral district that is known for the occurrence of large carbonate replacement deposits of precious and base metals. Las Coloradas is approximately 20 kilometres due north of Goldcorp's Penasquito mine, as well as near important mines/projects in Zacatecas such as Aranzazu (Aura Minerals), Tayahua (Frisco) and Camino Rojo (Goldcorp). Carbonate Replacement Deposits (CRDs) are Ag-Pb-Zn-(Cu-Au) deposits that have contributed approximately 40% of Mexico's historic silver production, making them second only to epithermal veins. Currently, they provide most of the zinc and lead production that put Mexico in 5th and 6th place, respectively, in worldwide production. CRDs form large deposits, ranging from 25 to 100 million tonnes of ore.
Table 1 below shows the assay results from holes 7-12 at Las Coloradas.
Table 1: Assay Results from Dia Bras drill holes DLC11B007-012
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Core
Hole # From (m) To (m) Length (m) Silver g/t Lead % Zinc % Copper %
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DLC011B007 271.00 273.50 2.50 175.9 1.83 0.18 0.14
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DLC011B008 287.80 335.70 47.90 57.2 0.89 1.32 0.14
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Incl. 319.85 324.70 4.85 145.4 1.84 2.88 0.39
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Incl. 330.40 334.20 3.80 141.7 2.27 4.13 0.34
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DLC011B009 41.60 43.30 1.70 97.8 1.49 1.06 0.06
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and 47.15 50.25 3.10 126.6 2.47 1.80 0.16
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and 135.50 142.90 7.40 163.2 0.50 1.28 0.04
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DLC011B010 328.15 329.95 1.80 39.1 1.46 0.54 0.06
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DLC011B011 123.70 144.90 21.20 49.8 1.14 1.27 0.07
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Incl. 143.40 144.90 1.50 136.0 3.41 0.57 0.07
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DLC011B012 184.50 212.40 27.90 109.4 1.93 1.87 0.16
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Incl. 187.50 189.40 1.90 162.3 3.62 2.49 0.28
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Incl. 196.90 204.90 8.00 175.4 3.10 2.79 0.24
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and 262.80 291.80 29.00 74.1 2.01 2.15 0.11
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Incl. 268.55 278.50 9.95 95.6 2.65 2.79 0.15
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Holes 7, 8, 9 & 10 were located in the western portion of the drilled area and encountered zones of potentially-economic mineralization (see drill hole location map). Holes 11 & 12 are located in the central portion and also cut zones of potentially-economic mineralization, as shown in the attached cross section of hole 12. More drill holes are required to determine the true widths of the intercepts, but the Company's geologists estimate the true widths to be 80-90% of the core lengths.
All holes were collared in sandstone and shale east of a wide (approx. 100 m) near-vertical, E-W trending fault zone and crossed into the Taraises Formation (thin-bedded limestone and mudstone) and then entered the La Caja Formation (siltstone and thick-bedded limestone) that was converted to skarn by intrusions of granodiorite. The lower portion of the Taraises Formation is also skarnified. Underlying the skarnified La Caja Formation is the Zuloaga Formation (massive limestone), which is generally un-mineralized.
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 and 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 pursuing the development and exploration of its most advanced assets - the Bolivar Property (copper-zinc-silver) and the Cusi Property (silver). Dia Bras is also exploring several precious metal targets such as La Cascada project at the Bolivar Property, the Las Coloradas project at Melchor Ocampo (Zacatecas State), the Bacerac Property (Sonora State) and the La Verde project at the Batopilas Property (Chihuahua State).
The Company's shares trade 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.
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:
Dia Bras Exploration Inc.
Daniel Tellechea
President & CEO
1 (866) 493-9646
Dia Bras Exploration Inc.
Karl J. Boltz
Vice President, Corporate Development
1 (866) 493-9646
www.diabras.com