VANCOUVER, BRITISH COLUMBIA (TSX VENTURE: MSQ) is pleased to
report that it has received an excellent preliminary metallurgy
report on its Idaho-based CUMO molybdenum project from SGS
Vancouver Metallurgy (SGS) entitled "The recovery of molybdenum,
copper and silver from the CUMO Samples". The report covers 75% of
the metallurgical work to be completed.
In December 2007, 114 drill core samples from CUMO drill holes
27, 28 and 29, totaling 745.5 kilograms and sorted into the three
mineralized zones, Cu-Ag, Cu-Mo and Mo, were delivered to SGS for
analysis. To date, rougher and cleaner flotation, QEMSCAN
mineralogical, and bench scale grinding studies have been completed
on the three zones.
Overall, the results of the studies completed show
better-than-expected recoveries in all parts of the deposit and
confirm that even at the low-grade end the recoveries are
excellent. Two different grinds were used, with the finer grind
giving better recoveries, especially in the case of copper. The
material is straightforward, with relatively low concentrations of
problematic minerals such as pyrite, clays and talc, lending itself
to effective Cu/Mo separation to create two saleable concentrates.
Reagent consumption appears to be slightly below average, due to
the lack of problematic minerals, indicating that processing will
be low-cost and relatively straightforward.
To date, Mosquito's own internal economic analyses of the
deposit have used the following recovery rates: 90% Mo, 60% Cu, and
50% Ag. The metallurgical study results indicate that much higher
recoveries can be achieved for all three metals, even at the lowest
grades. For example, in the cleaner flotation study, recoveries for
molybdenum were 97.5% in the Cu-Ag zone, 93.7% in the Cu-Mo zone,
and 94.9% in the Mo zone. Detailed results of the rougher and
cleaner flotation studies are provided below.
Geologically, the excellent recoveries are to be expected. For
example, in the cleaner concentrate for the Mo zone, the assay
grade for copper is only 0.03% Cu, yet recoveries were 91.1%. This
is the result of the copper being contained not in the host rock,
but in the quartz vein stockwork, which in itself accounts for only
one to ten percent of the overall rock. Metals within the rock are
thus confined to the veins and are coarser and higher grade than
would be expected when looking at just the average grade.
Average assay grades for the three zones of the samples are show
in the table below:
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Zone number weight MoS2 Mo Cu Ag
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name intervals kgs % % % g/t
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Cu-Ag 25 166.6 0.031 0.019 0.17 4.15
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Cu-Mo 41 274.7 0.067 0.040 0.12 2.82
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Mo 49 304.2 0.174 0.104 0.03 1.06
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Samples were selected in continuous intervals to represent the
volume and grade distribution within the overall deposit. It should
be noted that SGS maintains an extensive database of mines from
around the world for comparison purposes on certain of the
tests.
Over the next few weeks the remaining tests will be completed
and include the following:
- Lock cycle testing to improve recoveries from the flotation
cycle
- 10 kg cleaner flotation testing in bulk form to obtain
recoveries by treating the zones as a single sample
- Obtaining the potential recoveries of Tungsten(W) and
Gallium(Ga) from the tailings of the flotation process
- Obtaining a complete analysis of the concentrates including
Rhenium and Osmium
- Determining the chemical make-up of the final tailings from
the circuit
- Outlining a potential mill flow sheet for the deposit.
Once completed, a final report will be submitted and filed on
Sedar. This is expected within the next five weeks. The recoveries
from the final report will be built into the block model and all
drill hole intersections. This will provide an in-ground
recoverable metal value that can be used for cutoff grades and
assay averages to simplify the process of publishing results.
Detailed Results of the Metallurgical Testing
The Flotation Studies consisted of two levels, rougher and
cleaner flotation.
The rougher flotation study results are displayed below:
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Zone Grind Recovery
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microns mesh Cu Mo Ag
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Cu-Ag 63 250 72.66% 85.77% 75.82%
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Cu-Ag 125 120 58.72% 81.56% 70.30%
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Cu-Mo 63 250 89.31% 92.92% 74.51%
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Cu-Mo 125 120 89.72% 92.37% 73.99%
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----------------------------------------------------
Mo 63 250 76.96% 94.42% 64.35%
----------------------------------------------------
Mo 125 120 83.12% 96.94% 71.82%
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----------------------------------------------------
Note: the finer grind demonstrated better results on the copper,
especially in the Cu-Ag zone. Since copper is only a by-product,
work will be done later to determine the cost benefit of finer
grinding to improve the recoveries.
Using a 2 kg sample and only three cleaning stages, results for
the cleaner flotation study are displayed below:
- Cu-Ag zone produced a Cu concentrate assaying:
15.3% Cu, 2.3% Mo and 462 gms Ag/T at
64% Cu, 97.5% Mo and 64.9% Ag recoveries
- Cu-Mo zone produced a Cu-Mo Concentrate assaying:
18.0% Cu, 6.3% Mo and 344 gms Ag/T at
85.5% Cu, 93.7% Mo and 76.8% Ag recoveries
- Mo zone produced a Mo concentrate assaying:
5.94% Cu, 24.4% Mo and 151 gms Ag/T at
91.1% Cu, 94.9% Mo and 93.9% Ag recoveries.
Although preliminary in nature, the flotation studies indicate
that the material has good cleaning characteristics and that
further cleaning and separation will yield saleable Cu (greater
than 20% Cu) and Mo (greater than 50% Mo) concentrates. It should
be noted that Mosquito is planning to have its own molybdenum
roaster for its CUMO project, allowing it to produce saleable
technical molybdenum oxide from the Mo concentrate while recovering
valuable rhenium, osmium and sulphuric acid for additional
revenues. The copper concentrate will be sold to smelters.
The QEMSCAN Mineralogical Study was performed to determine what
minerals are present and the presence of any potential problematic
minerals in the processing circuit. The results from all three CUMO
zones were excellent, showing no problematic minerals and that the
recovery process should be relatively straightforward with no need
for expensive reagents in the mill circuit. Results are summarized
as follows:
- All three CUMO zones were found to be largely free of any of
fine grained clays or talc, indicating that no processing problems
should be expected. The presence of clay minerals and talc can
cause problems with recoveries and also poor water quality in the
tailings. They often lead to expensive reagents having to be added
to the mill process.
- Copper mineralization is chalcopyrite with very little oxide
and is finer grained than the molybdenum. Optimum grind size for
the molybdenum is 70 to 80 microns while for the copper it is 65
microns.
- Pyrite content of the CUMO zones is very low compared to other
deposits of this type, resulting in significant costs savings as
the amount of reagents required to handle the pyrite is reduced.
For example, the Thompson Creek molybdenum mine located only 100
kms from CUMO, has specific circuits added to the mill site to
handle the pyrite, adding to the cost to produce product.
A Grindability Study was conducted to give an indication as to
how easy it is to crush the rock. The higher the numbers, the more
it costs in terms of power and time to produce the grind required
to recover the final products. In the case of CUMO, the results for
all three samples were found to be well within the average of
existing large scale open pit mines. It should also be noted that
the molybdenum zone is softer and consumes 20% less power than the
other two zones. The Bond Ball Mill Work Index Values, which is a
measure of "grindability" in terms of kilowatt hours per ton (power
consumption), were as follows:
-----------------------------
-----------------------------
Zone Metric Imperial
-----------------------------
name kWh/tonne KWh/ton
-----------------------------
-----------------------------
Cu-Ag 15.8 14.3
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Cu-Mo 15.7 14.3
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Mo 12.6 11.4
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Mr. Shaun M. Dykes, M.Sc. (Eng), P.Geo., Exploration Manager and
Director of Mosquito is the designated qualified person for the
CUMO Project, and prepared the technical information contained in
this news release.
On Behalf of the Board
MOSQUITO CONSOLIDATED GOLD MINES LTD.
Brian McClay, President
About Mosquito Consolidated Gold Mines
Mosquito Consolidated Gold Mines Limited is a mining exploration
and development company with a diverse portfolio of high potential
precious and base metals projects, located in low political risk
environments in North America and Australia. The Company's primary
focus is developing its Idaho-based CUMO project, one of the
world's largest molybdenum deposits, and its Nevada-based Pine Tree
copper-molybdenum-silver project. For more information, please
visit www.mosquitogold.com.
THIS NEWS RELEASE WAS PREPARED BY MANAGEMENT WHO TAKES FULL
RESPONSIBILITY FOR ITS CONTENTS.
This news release includes certain statements that express
management's expectation or estimates of future performance and may
be deemed "forward-looking statements". These forward-looking
statements include plans, estimates, forecasts and statements as to
management's expectations regarding the CUMO Project. These
forward-looking statements involve assumptions, risks and
uncertainties and actual results may vary materially. For these
reasons shareholders should not place undue reliance on such
forward-looking information.
United States residents are cautioned that some of the
information that may be published by Mosquito may not be consistent
with United States Securities and Exchange Commission disclosure
rules and may be materially different from what the Company is
permitted to disclose in the United States and therefore United
States residents should not rely on such information.
The TSX-Venture Exchange does not accept responsibility for the
adequacy or accuracy of this release.
Contacts: Mosquito Consolidated Gold Mines Limited Brian McClay
President (604) 689-7902 (604) 689-7816 (FAX) Website:
www.mosquitogold.com
American Cumo Mining Corporation (TSXV:MSQ)
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