Completion of Phase 2 metallurgical test work to optimize the use of
desliming and carbonate rejection flotation, as well as chemical
reagent dosages to increase the efficiency of rougher/cleaner Ta/Nb
flotation and to finalize the preliminary process flow sheet developed
in Phase 1 which formed the basis of the PEA.
Mineral Resource update underway at AMEC to include results of
exploration in 2012, as well as 34 additional drill holes (totalling
8,715 m) of infill drilling completed in 2011.
VANCOUVER, Dec. 3, 2012 /CNW/ - Commerce Resources Corp. (TSXv: CCE, FSE: D7H, OTCQX: CMRZF) (the "Company" or "Commerce") is
pleased to provide an update on recent work completed at its Blue River
Project since release of the National Instrument (NI) 43-101 compliant
Mineral Resource update (effective date June 22, 2012 - see Commerce
news release dated July 6, 2012) for the Upper Fir Deposit.
The geological, engineering, metallurgical and environmental programs
carried out to date in 2012 broadly support the advancement of
exploration and development at the Company's wholly owned Blue River
Project, east-central British Columbia. These results continue to
strengthen the foundation of broadly based technical knowledge
developed in 2011, and following completion of the mineral resource
update currently in progress by independent consultants AMEC Americas
Ltd. ("AMEC"), will be sufficient to support the initiation of a
pre-feasibility study (PFS).
The Blue River Property is host to the Upper Fir Tantalum and Niobium
Deposit, which was discovered in 2002 and which has been the focus of
the Company's activities since 2005. In fiscal 2012 year to date
Commerce has spent approximately $3.7M (to October 31, 2012).
Metallurgical Test Work in 2012
Metallurgical work in 2012 has continued to update and optimize the
process flow sheet described in the NI 43-101 compliant Preliminary
Economic Assessment ("PEA") study completed by AMEC on the Blue River
Project (effective date of September 29, 2011; see Commerce news
release dated November 3, 2011). The process flow sheet for the
recovery of the tantalum and niobium described in the PEA was developed
in 2011 based on Phase 1 studies and is available on the corporate
website at http://www.commerceresources.com.
In April 2012, Commerce commissioned Acme Metallurgical Ltd ("Acme Met")
of Vancouver, BC to initiate a Phase 2 investigation. This was designed
to follow-up the successful results of the earlier program which had
tested flotation as the preferred method to remove the larger portion
of fine slimes and carbonatite minerals early in the process.
Subsequent process steps could then focus on material containing Ta and
The objectives of the Phase 2 testing were three fold: 1). to optimize
the use of desliming and carbonate rejection flotation; 2). to optimize
chemical reagent dosages to increase the efficiency of rougher/cleaner
Ta/Nb flotation; and 3). to finalize the process flow sheet developed
in Phase 1 which was based on composite samples BS-2F and BS 2G. All
Phase 2 work was conducted on these same composites and all tests were
conducted at a grind size of 80% passing 130 microns.
Key Areas of Investigation and Results:
Desliming and Mass Removal
Approximately 50 to 55% of the mass containing only 10-15% of the Ta and
Nb can be rejected prior to Ta/Nb flotation using desliming and
carbonate flotation. Reagent Na2SiO3 has been eliminated from the
desliming process while the flotation conditions in the carbonate
flotation process have been optimized to provide sufficient carbonate
Rougher flotation of Ta/Nb has also been optimized to yield total
rougher Ta/Nb recoveries of 85% and 90% on composites BS-2G and BS-2F,
respectively with a mass pull of 20-25% from the original mass being
recovered into the Ta-Nb minerals rougher concentrate.
In addition, effective flotation of carbonate from the BS-2F and BS-2G
samples was accomplished using 400 and 500 g/t of Oleic Acid
respectively. Na2SiO3 is added during conditioning to target a pH of
Lastly, H2SiF6 acid is used to condition the pulp to the pH 7 while 400
g/t and 500 g/t of Duomac T collector were used for composites BS- 2F
and BS-2G respectively.
Initial cleaner flotation testing on the Ta/Nb rougher concentrate has
generated promising results, showing a strong correlation between the
dosage of reagent, H2SiF6, as a silicate minerals depressant/pH
regulator, and the final Ta-Nb grade and recovery has been determined.
For example, if insufficient H2SiF6 is added to the cleaning process,
the Ta/Nb minerals will not selectively separate from the gangue
minerals, while an excessive amount of H2SiF6 can lead to a decrease in
the Ta/Nb recovery.
Though additional study is required, magnetic separation of the final
Ta/Nb flotation concentrate appears to show potential to further
enhance the Ta/Nb grades, with approximately 50% of the final
concentrate mass being removed with minimal Ta/Nb loss.
Acme Metallurgical recommends future investigation as follows:
focused testwork on the optimization of the cleaner flotation circuit,
in particular the addition of H2SiF6 addition in each of the cleaning
following optimization of the cleaner circuit, locked-cycle testing to
determine the impact of recycling various process streams where
improved recoveries are expected; and
additional studies to verify the potential success achieved with
magnetic separation including work on recoveries from magnetic tails.
Results are nearing completion for Phase 3 of metallurgical
investigations which considered the effects of variable tantalum and
niobium grades, mineralogy and lithological textures. This work will
be reported once results are received and reviewed.
2012 Field Exploration and Results
The 2012 field exploration program commenced in May and was completed in
A structural geology review of outcrop, core and previous data refined
concepts of "faults" versus "fractures" and confirmed the previously
held view that most faults have low displacement, likely resulting from
tectonic uplift and expansions. Successful completion of an updated
structural map supports the overall development of the three
dimensional structural model of the Upper Fir deposit.
The Company also re-logged selected diamond drill core from 2005-2009
with a particular focus on rock types, structures and carbonatite
textures to ensure conformity of these aspects over time. The work
provided only minor changes, but added considerable structural detail.
This will increase the level of confidence in structural model
interpretation and therefore better support for the resource block
An independent structural geology review of 2005-2010 data was conducted
to support use of the carbonatite model in resource definition. The
review verified the structural data previously collected and broadly
supported the structural constraints in the 2011 block model, as well
as the new model which will be used in the Mineral Resource Update.
Key results are as follows:
isosurfaces show a south-east trend in grade continuity similar to the
preferred orientation of fold hinges in the Upper Fir Deposit. These
patterns were defined using the software program, Leapfrog, which
analyzes grade continuity in three dimensions;
all data collected have been subject to a successful review under
AMEC-defined QA/QC (quality analysis/quality control) protocols;
an updated solids model in Gemcom has been provided to AMEC to initiate
the upcoming Mineral Resource Update.
Upcoming Mineral Resource Update
A Mineral Resource Update and subsequent technical report which will
incorporate all data from 2005 through 2012 is currently underway by
AMEC with completion targeted for the first quarter of 2013. This work
will build from the previous Mineral Resource Update technical report
(effective date June 22, 2012) in which AMEC compared results from the
34 holes totalling 8,715m drilled in 2011, after the closure of the
resource database to the updated resource model and found them to be
reasonably consistent with the geology predicted by the model.
2011 PEA Outcomes and Subsequent Resource Update (July 6. 2012)
The Preliminary Economic Assessment ("PEA) was prepared to define an
overall proof of concept for further development of the Blue River
Project. The PEA (effective date September 29, 2011) indicated that
the deposit can be developed economically as an underground mine and
recommended future studies to support a pre-feasibility level
assessment of the project. The assessment included geological and
mineral resource modeling, preliminary mine planning, a description of
metallurgical test work and process design, a summary of environmental
baseline work to date, and estimates for capital and operating costs.
As well, it determined the economics to develop the project as an
underground mine with process facility, and included an estimate of the
direct cash costs to produce tantalum contained in a technical grade
The resource on which the PEA was based considered only assay results
and drilling to the end of 2009. Commerce completed additional drilling
in 2010 and 2011. AMEC updated the original resource model on which the
PEA had been based with the data to the end of 2010 drilling using a
total of 237 holes comprising 50,395m of HQ diameter core and 12,736
samples. Most holes were at a nominal spacing of 50m with dips
typically between -60 degrees to sub-vertical.
The composite body extends more than 1,450m in a north-south direction
and as much as 800m in an east-west direction. Tantalum and niobium are
contained in the minerals ferrocolumbite and pyrochlore. The first of
what will eventually be two subsequent Mineral Resource Update
technical reports (effective date June 22, 2012) was released on July
6, 2012. Readers are encouraged to review both the entire PEA Technical
Report and the Mineral Resource Update Report which are available for
viewing at http://www.sedar.com. A link is also available on the corporate website at http://www.commerceresources.com.
"We are proud to have accomplished a significant amount of work in 2012
despite a very tough financing climate. We are again extremely pleased
with the results of the metallurgical study which provides an update to
testwork previously reported in the PEA, a major milestone in our
progress to develop the Upper Fir. The improved results and 2012
exploration reported today reinforce Commerce's belief that we are in
the process of building a very important long-term source of conflict
free and ethical tantalum which could potentially supply 10% of the
current world's market for the long term." said Dave Hodge, Commerce's
President. "Results of the additional drilling completed in 2011 and
our ongoing field work in 2012 have been compiled by our geologists and
supplied to AMEC to support the next resource update which will be
based on all work to the end of the 2012 field season. All indications
are that we will be able to enhance even further the quality of the
"Of necessity, our previous resource update was completed based on an
assumed long term pricing which may prove to be conservative. Recent
developments in global tantalum and niobium markets provide indication
of substantially higher prices than those used to define the resource.
For example, information available through Asian Metals provides early June 2012 pricing (CAD=0.9825 US) for average grade Nb205 (99.5%) of $US59-61/kg, and for average grade Ta205 (99.95% min) of $US483/kg. Such prices may provide an opportunity for
the ongoing resource update to the end of 2011 to be based on higher,
though still conservative, pricing."
The Blue River Project is located near the village of Blue River, which
is approximately 250 km north of the city of Kamloops and approximately
90 km south of the town of Valemount. The Project comprises 105,373
hectares (1,000 km2) of mineral claims. Power transmission lines, rail, and paved and
gravel roads are all adjacent to, or within the property boundaries.
Transalta Corp.'s 18 MW Bone Creek run-of-river hydroelectricity
project near the project was commissioned in June 2011.
NI 43-101 Disclosure
Ms. Jenna Hardy, M.Sc., P.Geo., Commerce Resources Corp., is a Qualified
Person as defined by National Instrument 43-101, read and approved the
disclosure of the technical information in this news release.
About Commerce Resources Corp.
Commerce Resources Corp. is an exploration and development company with
a particular focus on tantalum, niobium and rare metal deposits with
potential for economic grades and large tonnages. The Company is
specifically focused on the development of its Upper Fir Tantalum and
Niobium Deposit in British Columbia and its Ashram Rare Earth Element
Project in northern Quebec.
On Behalf of the Board of Directors
COMMERCE RESOURCES CORP.
President and Director
Neither 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 release.
This news release contains forward-looking information which is subject
to a variety of risks and uncertainties and other factors that could
cause actual events or results to differ from those projected in the
forward-looking statements. Forward looking statements in this press
release include that our results will be sufficient to support the
initiation of a pre-feasibility study; that we are in the process of
building a very important long-term source of tantalum which could
potentially supply 10% of the current world's market for the long term;
that we will be able to enhance even further the quality of the
resource; and that prices for our potential products are conservatively
estimated and may trend upwards. These forward-looking statements are
based on the opinions and estimates of management and its consultants
at the date the information is disseminated. They are subject to a
variety of risks and uncertainties and other factors that could cause
actual events or results to differ materially from those projected in
the forward-looking information. Risks that could change or prevent these statements from coming to
fruition include changing costs for mining and processing and their
impact on the cut off value established; increased capital costs;
changing forecasts of mine production rates; the timing and content of
upcoming work programs; geological interpretations based on drilling
that may change with more detailed information; potential process
methods and mineral recoveries assumption based on limited test work
and by comparison to what are considered analogous deposits that with
further test work may not be comparable; the availability of labour,
equipment and markets for the products produced; market pricing for the
products produced; and despite the current expected viability of the
project, conditions changing such that the minerals on our property
cannot be economically mined, or that the required permits to build and
operate the envisaged mine can be obtained. The forward-looking
information contained herein is given as of the date hereof and the
Company assumes no responsibility to update or revise such information
to reflect new events or circumstances, except as required by law.
SOURCE: Commerce Resources Corp.
For further information:
please visit the corporate website at http://www.commerceresources.com or contact Investor Relations at 1.866.484.2700 or firstname.lastname@example.org