Dia Bras Exploration Inc.

Dia Bras Exploration Inc.

March 04, 2010 14:43 ET

Dia Bras Drills More High-Grade Silver Mineralization at Cusi

MONTREAL, QUEBEC--(Marketwire - March 4, 2010) - Dia Bras Exploration Inc. (TSX VENTURE:DIB) is pleased to announce more results of exploration drilling at the Santa Eduviges and Promontorio mines of Dia Bras' Cusi property, in Chihuahua State, Mexico, which is being conducted in support of the pilot-mining that recommenced in early October, 2009. The objective of the drilling of the San Antonio and San Antonio A veins of the Santa Eduviges vein system is to identify blocks that will be pilot-mined during 2010. Drilling at Promontorio (El Gallo vein) is designed to support development of a mine plan for 2011, when pilot-mining is scheduled to begin at this mine and its output added to that of Santa Eduviges.

Drill holes 266 and 268 were located and designed to provide information between other drill holes in a mineralized zone that is currently being developed by a ramp. Results returned from these holes demonstrate that silver mineralization is more continuous in the San Antonio and San Antonio A veins, given the reduced spacing between holes in this area. The following table shows the assay results:

Hole ID From
Estimated True Width (m) Ag
DC10B2661 119.3 120.1 0.80 0.70 310 3.58 10.22 HW S Antonio A
  127.0 127.9 0.90 0.75 246 1.73 5.19 HW S Antonio A
  133.6 136.2 2.60 1.70 457 0.84 0.61 S Antonio A
DC10B2662 119.3 120.1 0.80 0.55 329 3.91 10.80 HW S Antonio A
  127.0 127.9 0.90 0.65 225 1.55 5.20 HW S Antonio A
  133.6 136.2 2.60 1.77 425 0.81 1.96 S Antonio A
Includes 133.6 134.3 0.70 0.50 851 0.74 2.93 S Antonio A
DC10B2682 130.8 131.8 1.00 0.75 145 0.05 0.22 S Antonio A
  131.8 132.4 0.60 0.45 249 0.02 0.07 S Antonio A
DC10B2692 95.8 96.4 0.60 0.45 1325 0.10 0.12 HW El Gallo
  96.4 97.1 0.70 0.55 706 0.06 0.10 HW El Gallo
"HW" – Hanging Wall
Note 1: Results from the Company's Malpaso lab that were published February 4, 2010.
Note 2: Current assays are from ALS Chemex.

Comparison of the results from the Corporation's Malpaso lab and from ALS Chemex for samples from hole 266 shows that the Malpaso lab provides the Corporation with reliable results.


The objective of pilot-mining of the Cusi deposit is to obtain factual information on the metallurgy of silver, lead and zinc mineralization, recovery rates, per tonne revenues at various commodity prices, mining costs and other factors. This information is essential for evaluation of the property's economic potential. During January and February, 2010, the company processed 3,397 tonnes of rock averaging 311 g/t silver, 0.55% lead and 1.08% zinc.

For the 2 month period, primary stage silver recovery using flotation was 68.95%. Approximately 41% of these mill tailings were then fed to the vat leach circuits for secondary processing; the remaining 59% of the tails were stored in temporary holding ponds while additional leach vats are being constructed. Leaching of the 41% of the tailings resulted in production of six doré bars during January and February which contained 2,014.5 ounces of silver. The final overall silver recovery is calculated to be approximately 83%.

43-101 Update

Dia Bras has re-commissioned Geostat (SGS Canada, Inc.) of Montreal, Quebec, to update the resource calculation for the Cusi project that Geostat completed in May, 2008 (please see news release of May 1, 2008). This calculation resulted in 2.12 million ounces of AgEq (equivalent ounces of Silver) in the Measured plus Indicated categories and 14.6 million ounces of AgEq in the Inferred category for Santa Eduviges and Promontorio. 

As part of the update, Geostat personnel visited the Cusi project during February 16-18 to review information, collect 36 confirmation samples from six drill holes, visit the Corporation's Malpaso Mill and analytical lab, and discuss the project with the Corporation's geologists.

Dia Bras Exploration at PDAC, March 7-10, 2010

Dia Bras Exploration Inc. personnel will be attending the PDAC. The corporate display booth will be located at position 3009 in the Investors Exchange for both Session A & B (Sunday through Wednesday, March 7-10). Rock samples from Bolivar and Cusi will be on display, as well as maps and cross sections showing results of the Corporation's exploration at Bolivar, Cusi and its regional gold properties.

Method of Analysis

Samples sent for analysis are 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., RPG, CPG and Director of Dia Bras, a Qualified Person as defined in NI 43-101.

About Dia Bras

Dia Bras Exploration Inc. is a Canadian exploration mining corporation focused on precious and base metals in the State of Chihuahua 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". 

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