Dia Bras Exploration Inc.
TSX VENTURE : DIB

Dia Bras Exploration Inc.

March 21, 2007 10:18 ET

Dia Bras: High Silver Values at Cusi

MONTREAL, QUEBEC--(CCNMatthews - March 21, 2007) - Dia Bras Exploration Inc. (TSX VENTURE:DIB) is pleased to the report results from its ongoing exploration program on the Cusi property, located in the State of Chihuahua, Mexico.

The regional geological mapping program, under the supervision of Dr. Andre Ciesielski, has revealed the presence of a number of gold-silver veins and breccias not previously reported in the northwestern part of the Cusi property. Three groups of mineralized and brecciated faults have been identified to date, over a minimum surface strike length of 9.2 km, which is in addition to the 80 km of cumulative strike length of veins previously reported.

These newly discovered gold-silver showings, often associated with base metal values, show remarkable grades within structurally and/or hydrothermally controlled breccias, of variable width and size (several centimetres to one metre), usually crosscutting the ignimbrite, and composed of quartz - kaolinite - limonite and manganese oxide. Some of the best results from grab samples include 1.97 g/t Au and 568 g/t Ag, 0.8 g/t Au and 917 g/t Ag in the San Nicolas area and 1.2 g/t Au and 2.503 kg/t Ag in the La Gloria area (see Figure 1 and Table 1). To see Figure 1 click the following link: http://www.ccnmatthews.com/docs/cusimarch21.pdf

Following reception of these assays, a channel chip sampling program of some of the accessible historic underground workings of the vertical shaft Tiro San Nicolas was initiated, and impressive results have been received, such as: 57.4 g/t Au 1.960 kg/t Ag and 2.6% Pb, 0.086 g/t Au, 1.425 kg/t Ag and 0.28% Pb (see Table 2 and Figure 2). To see Figure 2, click the following link: http://www.ccnmatthews.com/docs/tiromarch21.pdf

Because of the high gold content reported in sample DC07AC612-B, the sample has been re-assayed and returned 58.3 g/t Au.

Other prospects of the Cusi Project area, such as the historic Promontorio Mine, also show high silver values in grab samples, such as 2.2 kg/t Ag from a brecciated zone from the drift.

These results are very encouraging in light of the 25,000-metre diamond drilling program underway, and a drill rig will be mobilized early next month to this area (see press release, March 1, 2007).



Table 1 : Grab Samples from Cusi Project
------------------------------------------------------------------
Au Ag Pb Zn
SAMPLE Easting Northing g/t g/t % %
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AC 30A 320178 3123046 0.016 16 0.005 0.02
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AC 65B 319392 3124118 0.042 26 0.53 0.18
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AC 69 318986 3124499 0.854 138 0.003 0.34
------------------------------------------------------------------
AC 140 319652 3123832 0.204 185 0.160 0.564
------------------------------------------------------------------
greater greater
AC 177 319208 3124670 0.793 291 than 1.00 than 1.00
------------------------------------------------------------------
AC 356 318943 3125245 1.973 568 0.208 0.123
------------------------------------------------------------------
greater
AC 375 319016 3125220 0.801 917 than 1.00 0.319
------------------------------------------------------------------
AC 382 318490 3124235 1.201 2,503 0.384 0.400
------------------------------------------------------------------
AC 391 318926 3123778 0.024 11 0.001 0.007
------------------------------------------------------------------
AC 399 318347 3124159 0.311 68 0.012 0.004
------------------------------------------------------------------
AC 399 (2) 318347 3124159 0.128 454 0.011 0.155
------------------------------------------------------------------
AC 400 318241 3124058 0.216 224 0.009 2084
------------------------------------------------------------------
greater
AC 423A 318591 3125332 0.372 23 than 1.00 0.763
------------------------------------------------------------------
AC 423B 318591 3125332 0.004 93 0.472 0.515
------------------------------------------------------------------
AC 517 317186 3125416 0.001 19 0.036 0.001
------------------------------------------------------------------
AC 521 318945 3125602 0.144 1,272 0.1302 0.079
------------------------------------------------------------------
greater greater
AC 528A 319600 3124900 0.281 484 than 1.00 than 1.00
------------------------------------------------------------------
AC 528B 319600 3124900 0.009 012 0.041 0.066
------------------------------------------------------------------


Table 2 : Tiro San Nicolas Channel Samples
-----------------------------------------------------------
Au Ag Pb Zn Cu Length
Sample g/t g/t % % % m
-----------------------------------------------------------
DC07AC612-A 0.003 353 0.30 0.16 0.02 1.0
-----------------------------------------------------------
DC07AC612-B 57.4 1,960 2.60 0.79 0.10 0.2
-----------------------------------------------------------
Re-assay 58.3
-----------------------------------------------------------
DC07AC612-C 0.076 1,117 0.34 0.38 0.01 0.3
-----------------------------------------------------------
DC07AC612-D 0.008 140 0.11 0.21 0.04 0.9
-----------------------------------------------------------
DC07AC612-E 0.040 1,023 0.31 1.10 0.01 1.0
-----------------------------------------------------------
DC07AC612-F 0.065 544 0.46 0.46 0.01 0.5
-----------------------------------------------------------
DC07AC612-G 0.086 1,425 0.28 0.19 0.04 0.2
-----------------------------------------------------------
DC07AC612-H 0.066 1,493 0.15 0.17 0.03 0.3
-----------------------------------------------------------


Table 3: Promontorio Samples
-------------------------------------------------------------------------
Au Ag Pb Zn Cu Length
Sample g/t g/t % % % Type m
-------------------------------------------------------------------------
AC521-A 0.003 341 0.15 0.17 0.06 Chip -
-------------------------------------------------------------------------
AC521-B 0.001 175 0.13 0.18 0.03 Chip -
-------------------------------------------------------------------------
AC521-C 0.002 229 0.09 0.26 0.10 Chip -
-------------------------------------------------------------------------
AC521-D 0.004 325 0.15 0.06 0.07 Chan 0.2
-------------------------------------------------------------------------
AC521-E 0.004 287 0.08 0.10 0.11 Chan 0.8
-------------------------------------------------------------------------
AC521-F 0.0005 16 0.02 0.02 0.05 Chan 0.4
-------------------------------------------------------------------------
AC521-W 0.0005 108 0.03 0.09 0.03 Grab
-------------------------------------------------------------------------
AC521-X 0.008 2,207 0.16 0.34 0.57 Grab
-------------------------------------------------------------------------


Method of analysis

Gold and silver values were determined by the fire assay method, and lead, zinc, copper by AA method at the Dia Bras Malpaso mill lab.

The technical content of this news release has been approved by Francois Auclair, P.Geo. and Vice-President, Exploration of Dia Bras, a Qualified Person as defined in NI43-101.

About Dia Bras

Dia Bras is a Canadian exploration mining company focused on precious and base metals in the State of Chihuahua, in northern Mexico. The Company is committed to developing and adding value to its assets - the Bolivar copper-zinc project and the newly acquired Cusi silver mining camp. The Company trades 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.

The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this press release.

Contact Information

  • Dia Bras Exploration
    Thomas L. Robyn
    Executive Chairman
    514-393-8875 ext. 241
    or
    Dia Bras Exploration
    Rejean Gosselin
    President
    514-393-8875 ext. 241
    or
    Sun International Communications
    Nicole Blanchard
    Managing Partner
    450-627-6600