Quest Rare Minerals Ltd. (TSX VENTURE:QRM)(NYSE Amex:QRM) is
pleased to provide a summary of the metallurgical test results of
its Strange Lake B-Zone deposit. Significant improvements in metal
extraction have been achieved at Hazen Research, of Golden,
Colorado ("Hazen"). Acid consumptions of approximately 200 kg/ton
are being achieved with REE dissolutions in the 90-96% range,
niobium dissolutions in the 93-96% range, and zirconium
dissolutions in the 85-93% range. Considerable bench scale work has
shown excellent reproducibility, and most operating variables have
been established.
Work at Process Research Ortech Inc. ("Ortech") commenced in the
first quarter of 2012, and significant progress has been achieved.
Flow sheets to achieve the separation of zirconium, niobium,
uranium & thorium, and REE concentrate have been developed.
Quest is pleased to report that bench scale work has confirmed
these flow sheets to the extent that a zirconium hydroxide product
and a REE+Y oxalate product have been produced. Uranium and thorium
have also been successfully extracted from the circuit with the
intention of producing an environmentally stable discharge product.
Significant work has been carried out on niobium and titanium
separation. It is expected that this separation will be resolved in
June, 2012.
Results of work completed are indicated in the table below.
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Previous Current
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Leach Extraction
Zr 80% 85-93%
Nb 80% 93-96%
REE+Y 80% 90-96%
Solid Liquid Separation - 98-99%
Solvent Extraction Recoveries(1)
Zr 96% 95-97%
Nb 96% 85-95%
REE+Y 96% greater than 96%
Overall Recoveries
Zr 77% 80-89%
Nb 77% 77-90%
REE+Y 77% 85-91%
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(1) Projected based on typical counter-current SX operation. These
recoveries will be confirmed in mini pilot testing expected to begin in Q4
2012.
"The metallurgical test results from the Strange Lake B-Zone are
extremely encouraging," said Peter J. Cashin, Quest's President
& CEO. "The relatively simple flow sheet has demonstrated
recoveries significantly higher than those achieved in previous
test work for Strange Lake, and also higher relative to our peers
in the rare earth sector."
Thermal Sulphation
Extensive bench scale testing of a thermal sulphation process
has been completed at Hazen. Test work has been performed on a
number of metallurgical samples, including a composite sample that
represents the first 10 years of mine life.
In the process that has been developed, run of mine material is
crushed and ground, then mixed with sulfuric acid. The material is
then heated and undergoes a thermal sulphation process where the
sulphuric acid attacks the ore and forms the sulphates of the
contained value metals. The dry calcine proceeds to a water leach
where the values are dissolved into solution. The slurry is
filtered and washed to produce a pregnant leach solution.
Extensive testing of the thermal process has determined
conditions at which the refractory rare earth containing minerals
can be attacked without the use of caustic (sodium hydroxide) or
extreme temperatures. Rare earth, zirconium, and niobium recoveries
to solution of up to 96%, 93%, and 96%, respectively, have been
demonstrated.
Solvent Extraction Experiments
Bench scale solvent extraction test work to develop the
separation processes at Ortech is ongoing. A detailed literature
review has been completed, and this has formed the basis for the
successful test work program that has identified separation routes
for rare earths, zirconium and hafnium, niobium, titanium, and the
removal of uranium and thorium. Small quantities of zirconium
product, and a bulk REE+Y concentrate have also been produced.
The pregnant leach solution containing the zirconium, niobium,
and rare earth values is the starting point for solvent extraction
testing. The bench scale testing involves selecting appropriate
organic reagents and analyzing their ability to separate the value
metals from contaminants and each other. All solvent extraction
separations are achieved using commercially available
extractants.
In the flow sheet that has been developed, zirconium and niobium
are removed and uranium and thorium recovered for final disposal.
Following these initial separations, oxalic acid is added to the
main process stream to precipitate rare earths and yttrium. Over
97% of the REE+Y values in solution are recovered to the oxalate
precipitate. This oxalate precipitate will then be re-dissolved to
produce a concentrated solution of rare earths and yttrium, which
will undergo further refining using solvent extraction to achieve
the individual separations.
Future Work
Mini-pilot plant testing to confirm individual product flow
sheets established from bench scale testing is scheduled to begin
in September, 2012. The results of these pilot programs will be
used to finalize the flow sheet for the full scale pilot plant. The
full scale pilot plant is expected to be operational in Q1 2013.
The separations facility will therefore not be part of the PFS.
In another announcement, Quest Rare Minerals wishes to confirm
the appointment of Mr. Colin Lindsay as the Vice President of
Operations. Colin recently joined the Quest Team as the Senior
Project Manager and brings a wealth of experience to move the
Strange Lake project development forward. Reno Pressacco has
resigned as the Vice President of Operations, effective May 15,
2012. The Board of Directors would like to thank Reno for his
dedication and contribution to the Company during his tenure and
wish him well in his future endeavours.
About Quest Rare Minerals
Quest Rare Minerals Ltd. is a Canadian-based exploration company
focused on the identification and discovery of new and significant
Rare Earth deposit opportunities. Quest is publicly listed on the
TSX Venture Exchange and NYSE Amex as "QRM" and is led by a
highly-respected management and technical team with a proven mine
finding track record. Quest is currently advancing several
high-potential projects in Canada's premier exploration areas: the
Strange Lake and Misery Lake areas of northeastern Quebec. Quest's
2009 exploration led to the discovery of a significant new Rare
Earth metal deposit, the B-Zone, on its Strange Lake property in
northeastern Quebec. Quest recently filed a 43-101 Indicated and
Inferred Resource Estimate on the B-Zone deposit and has completed
a Preliminary Economic Assessment (PEA) for the deposit. In
addition, Quest announced the discovery of an important new area of
REE mineralization on its Misery Lake project, approximately 120 km
south of the Strange Lake project. Quest continues to pursue
high-value project opportunities throughout North America. As a
result of a marketed equity financing completed in October 2010,
Quest has a strong working capital position of $44.5 million.
Forward-Looking Statements
This news release contains statements that may constitute
"forward-looking information" or "forward-looking statements"
within the meaning of applicable Canadian and U.S. securities
legislation. Forward-looking information and statements may
include, among others, statements regarding the future plans,
costs, objectives or performance of Quest Rare Minerals Ltd.
("Quest"), or the assumptions underlying any of the foregoing. In
this news release, words such as "may", "would", "could", "will",
"likely", "believe", "expect", "anticipate", "intend", "plan",
"estimate" and similar words and the negative form thereof are used
to identify forward-looking statements. Forward-looking statements
should not be read as guarantees of future performance or results,
and will not necessarily be accurate indications of whether, or the
times at or by which, such future performance will be achieved. No
assurance can be given that any events anticipated by the
forward-looking information will transpire or occur, or if any of
them do so, what benefits that Quest will derive. Forward-looking
statements and information are based on information available at
the time and/or management's good-faith belief with respect to
future events and are subject to known or unknown risks,
uncertainties, assumptions and other unpredictable factors, many of
which are beyond Quest's control. These risks, uncertainties and
assumptions include, but are not limited to, those described under
"Risk Factors" in Quest's annual information form dated March 2,
2011, and under the heading "Risk Factors" in Quest's Management's
Discussion and Analysis for the quarter ended January 31, 2011,
both of which are available on SEDAR at www.sedar.com and on EDGAR
at www.sec.gov, and could cause actual events or results to differ
materially from those projected in any forward-looking statements.
Quest does not intend, nor does Quest undertake any obligation, to
update or revise any forward-looking information or statements
contained in this news release to reflect subsequent information,
events or circumstances or otherwise, except if required by
applicable laws.
To view the figure associated with this press release, please
visit the following link:
http://media3.marketwire.com/docs/QRMflowchart.pdf.
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.
Contacts: Quest Rare Minerals Ltd. Peter J. Cashin President
& CEO (416) 916-0777 or toll-free: 1-877-916-0777 (416)
916-0779 (FAX)info@questrareminerals.com Quest Rare Minerals Ltd.
Colin Lindsay Vice-President, Operations (416) 916-0777 or
toll-free: 1-877-916-0777 (416) 916-0779
(FAX)info@questrareminerals.com www.questrareminerals.com
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