Dia Bras Exploration Inc.
TSX VENTURE : DIB

Dia Bras Exploration Inc.

May 09, 2011 10:30 ET

Dia Bras Provides Results From Bulk Sampling at Increible at Its Bolivar Project

TORONTO, ONTARIO--(Marketwire - May 9, 2011) -Dia Bras Exploration Inc. (TSX VENTURE:DIB)("Dia Bras" or the "Company") is pleased to report that representative sampling of rock mined from the Increíble deposit, at Dia Bras' 100% owned Bolivar Project, indicates a significant upgrade of copper-silver-zinc grades by screening of mined rock. For example, the copper grade increased from 0.57% to 1.89% by simple screening (by hand) without crushing.

"These results are significant in that they demonstrate Increíble can provide good-grade feed to our new Piedras Verde Mill," stated Daniel Tellechea, President and CEO. "We are also developing additional deposits, such as El Gallo and La Narizona, to provide feed. Operation of the mill will significantly reduce the Company's cash cost of production as well as increase the life of the mine, and will optimize the NAV (net asset value) of the Company as we will be able to mine lower grade material."

The Increíble deposit is a silver-copper-zinc mineralized breccia pipe that measures 80 m x 60 m and has been drilled by Dia Bras over a vertical extent of 400 metres, which indicates a potential minimum volume of about two million cubic metres, although the breccia pipe is open to depth. The attached Figure 1 http://www.diabras.com/files/media/12e55_La%20Increible%20Breccia%20-%20Level%202%20Development.pdf shows a plan map for Level 2.

Rock mined during development of Level 2 of the Increíble deposit was stockpiled near Level 2's portal in a pile 100 x 25 m in extent. The Sampling Methodology is given below.

The average grade of the mined rock is 0.57% Cu and 0.57% Zn, which was upgraded by screening of the rock at 3/8" size. The upgraded results from the -3/8" rock are shown in Table 1 below.

Table 1: Assay Results from Increíble Sampling

Trench #Sample #Sample
Width (m)
Kg
(-3/8")
Kg
(+3/8")
Ag g/t
(-3/8")
Cu %
(-3/8")
Zn %
(-3/8")
11688215.514.045.056.91.771.75
21688226.314.537.053.71.791.96
31688237.313.039.043.71.721.82
41688246.910.032.049.81.691.89
51688257.217.029.049.01.751.99
61688267.515.035.054.91.621.88
71688277.311.530.052.92.022.19
81688287.612.031.045.41.711.95
91688298.48.530.047.81.802.10
101688307.112.034.069.22.421.89
111688317.914.035.054.02.291.87
121688327.813.030.056.12.371.71
131688337.512.028.045.02.051.84
141688346.913.035.041.51.591.85
Average/Total7.23179.5470.051.51.891.90

These results indicate that the rock contained in the breccia pipe can be screened without crushing and yield a 3-fold increase in grade with 25-30% of the original volume in the screened undersize fraction.

Sampling Methodology

The stockpile was trenched with a D-8 bulldozer that cut a 75 m long by 7 m wide trench to a depth of 1 m in a 'V' shape (see Figure 2 "La Increible Mineral Stockpile" http://www.diabras.com/files/media/ba99e_La%20Increible%20Mineral%20Stockpile.pdf).

Samples were taken from 14 trenches with 5 m spacing that were cut across the width of the pile. Sample material was excavated by shovel, hand-screened to -3/8, with the -3/8" material collected on a tarp to avoid contamination. The -3/8" and +3/8" samples were weighed with a hand scale, ticketed, and put into their respective bags for control. The -3/8" samples were sent to Chemex for multi-element analysis, according to Dia Bras' standard procedures. The +3/8" samples are stored in a Company warehouse. The sampling program was designed and supervised by a senior geologist of Dia Bras.

Because of the soft nature of the minerals chalcocite, bornite, chalcopyrite and sphalerite hosted by fractures and drusy vugs in the Increíble deposit, one screening by hand without crushing yielded the upgraded results shown in Table 1. During operations, it can be expected that the volume of the -3/8" fraction will be increased due to increased abrasion by power screening. The amount of increase will not be known until operations commence.

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 and 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".

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

  • Daniel Tellechea
    President & CEO
    Dia Bras Exploration Inc.
    1-866-493-9646

    Karl J. Boltz
    Vice President, Corporate Development
    Dia Bras Exploration Inc.
    1-866-493-9646