Plexmar Resources Inc.

Plexmar Resources Inc.

July 19, 2005 08:30 ET

Plexmar Resources Inc.: Metallurgical results

QUEBEC CITY, QUEBEC--(CCNMatthews - July 19, 2005) - Plexmar Resources Inc. (TSX VENTURE:PLE), has received the first results from metallurgical tests carried out on gold and silver bearing material from its Bolsa del Diablo property located in Northern Peru.

Exploratory tests were carried out to evaluate the behavior of this ore to cyanidation and its possible operating parameters, like gold and silver recoveries, cyanide and lime consumption and time of residence.

Tests were performed at CIMM PERU INC., a lab with international certification.

A 70 kg sample of tailings from am amalgam of oxidized gold ore coming from the Bolsa del Diablo property was tested. The material was taken from different pits after local miners extracted gold using 'quimbaletes' to crush the ore and amalgamating gold with mercury. The head grade was 37.4 g/t Au, 60 g/t Ag, 273 ppm of Hg and 0.3% As.

Currently, local miners are extracting ore grading as high as 150 grams of gold par latta. (33 lattas equals 1 ton), so 4,950 g/ton or 149 ounces of gold per ton.

The cyanidation tests of soluble gold and CIL were carried out with regrinding to 93% -200 mesh (74 microns), approximately 100% -100 mesh to a ph of 10.5 and with an average of 1,500 ppm of cyanide in pulp of 30% of solids; for 60 hours of agitation.

Recommendations and Comments:

It is possible to recover more than the 83% of the gold and
31.6% of the silver with direct cyanidation, CIL, with an
agitation time of 60 hours from an amalgam of tailings from
Bolsa del Diablo.

Better gold and silver recoveries could be obtained by
increasing the agitation time and the degree of grinding. It is
recommended to continue the tests to tune up these parameters in
order to reach a minimum 90% recovery for gold.

Despite the Arsenic content, the cyanide consumption is
relatively low: less than 2Kg/Ton of ore, the lime consumption
(85% useful lime) is also low, less than 2 Kg per ton of ore.

It is recommended to carry out a petrography study to determine
the minerals associated with the gold and silver. This would
give more information to improve the processing and the recovery
of values.

The CIL or CIP process, with coal activated in pulp would be the
most adequate, since a very good kinetic extraction is observed
the first 24 hours, diminishing drastically in the following
hours presenting an pre-rubbing effect.

It is finally recommended to complete metallurgical tests with
representative samples of fresh ore.

Plexmar's management is quite happy with these results as it indicates that the ore could be processed in a very cost efficient way. Tests will be carried out with fresh rock as soon as possible.

It is Plexmar's intent to install a processing plant in the area to quickly generate a cash flow in order to fund its exploration program. Please refer to March 29, 2005 press release.

M. Guy Bedard acted as the qualified person (as defined by the National Instrument norm 43-101).

46 M shares outstanding

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

Contact Information

  • Plexmar Resources Inc.
    Guy Bedard
    (418) 658-6776
    (418) 658-8605 (FAX)
    Paradox Public Relations
    (866) 460-0408
    (514) 341-0408