Bear Creek updates positive results of Corani metallurgical testing

    VANCOUVER, April 11 /CNW/ - Bear Creek Mining (TSX Venture: BCM) ("Bear
Creek" or the "Company") is pleased to provide an update on the Phase II
metallurgical test work currently underway on its Corani silver-lead-zinc
    The Phase II program is designed to provide further definition to the
metallurgical characteristics of the Corani ore as well as provide additional
parameters to guide design of the optimum flow sheet. All necessary elements
for the project scoping study (power, access, transportation, water, social
issues, and infrastructure) have been satisfactorily addressed. The Phase II
metallurgical test results are required to define the process flow sheet in
order to complete the study.
    Andrew Swarthout, President/CEO stated "Our Phase II program is well
underway and we are pleased to report that, while still in the early stages of
evaluation, the results to date indicate that the Corani ores will respond
well to conventional recovery technologies. Phase II metallurgy is now focused
on the many avenues open to us to increase both the recoveries and the quality
of the concentrates. We continue to be confident in the metallurgy at Corani
and that we will define a flow sheet that will provide very acceptable
recoveries. One of our most significant challenges remains the record delays
from metallurgical testing facilities; a primary issue causing delays for all
companies in project evaluation stages".

    Phase I Summary

    The first phase of test work shows that an average combined silver
recovery of approximately 76% can be obtained from high-sulfide silver
mineralization (see news release 27 Sept '06). Lead recoveries of plus 60%
have been achieved and silver-rich lead concentrates have been produced; and,
further testing is indicated in order to achieve concentrate grades that are
commercially acceptable. Phase II testing is focusing on maximizing
concentrate grades to achieve high-quality commercial concentrates while
maintaining high metal recoveries. Zinc recoveries of 87% have been produced
when ore grades are greater than 2% zinc. These higher zinc recoveries are
important considering that the majority (approximately 67%) of the zinc occurs
in discrete high-grade pods within the ore body which are expected to be
processed separately. Importantly, deleterious trace elements are well below
penalty levels in all of the concentrate products.

    Phase II Summary

    The second phase test work is being performed by SGS-Lakefield
Laboratories in Ontario on HQ drill core specifically obtained for this
program in December 2006 and involves:

    -  optimizing rougher concentration parameters
    -  improving flotation cleaner efficiencies, and
    -  optimizing recoveries and concentrate grades.

    Phase II testing is focusing on some of the areas where significant
opportunities exist to further increase recoveries and concentrate grades,
specifically investigating:

    -  the fine-grained nature of the silver-rich sulfides and some of the
       galena minerals
    -  finer grinding which is expected to improve recoveries of both silver
       and lead, and
    -  suppressing the effect of clays (de-sliming) prior to the final stages
       of flotation which is a common processing practice.

    Successful completion of these tests will likely result in higher
recoveries and produce a cleaner, higher value concentrate than previously
indicated by the Phase 1 tests results. SGS-Lakefield and the Company believe
that existing technologies will satisfactorily address remaining metallurgical
issues as well as provide significant optimization.
    Recently completed chemical analysis and the detailed mineralogy show:

    -  the silver occurs predominantly in silver-rich tetrahedrite
    -  sphalerite is the only source of zinc mineralization, and
    -  the lead is found primarily in galena and to a lesser degree as a lead

    Tetrahedrite, galena and sphalerite all respond well to conventional
flotation recovery methods.
    Testing indicates that the probable recovery method will use conventional
technologies including coarse grinding, flotation and fine grinding prior to
final cleaning of concentrates to produce a silver-rich lead concentrate and a
separate zinc concentrate. There will also likely be selective leaching of
certain process streams to produce silver dore on site and maximize silver
    The Company is satisfied that the metallurgical recoveries will
ultimately be comparable to the IMC recovery assumptions of 85% for silver,
65% for lead, and 65% for zinc (see news release 5 Dec '06).
    Bear Creek is also pleased to report that Peter Munro (Mineralurgy Pty
LTD, Australia), a world-renowned expert in silver-lead-zinc metallurgy, has
been retained by the Company to evaluate the testing results to date and
provide recommendations for ongoing test work to assist in design of the
process flow sheet.
    Mr. Deepak Mulhotra of Resource Development Inc., a recognized expert in
process design, has also been retained to assist in testing and scoping study

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

    For further information, please visit the Company's website

    Regulatory footnotes:

    All of Bear Creek's exploration programs and pertinent disclosure of a
technical or scientific nature are prepared by or prepared under the direct
supervision of David Volkert, P.Geo., Bear Creek's Vice President of
Exploration or Marc Leduc, P. Engr., Vice President Technical Services, and
the President and CEO, Andrew Swarthout, P.Geo., the President and Chief
Executive Officer, who serve as the Qualified Persons under the definitions of
NI 43-101. All diamond drilling has been performed using HQ diameter core with
recoveries averaging greater than 95%. Core is logged and split on site under
the supervision of Bear Creek geologists. Sampling is done on two-meter
intervals and samples are transported by Company staff to Cusco, Peru for
direct shipping to ALS Chemex, Laboratories in Lima, Peru. ALS Chemex is an
ISO 9001:2000-registered laboratory and is preparing for ISO 17025
certification. Silver, lead, and zinc assays utilize a multi-acid digestion
with atomic absorption ("ore-grade assay method"). The QC/QA program includes
the insertion every 20th sample of known standards prepared by SGS
Laboratories, Lima. A section in Bear Creek's website is dedicated to
sampling, assay and quality control procedures.
    Certain disclosure in this release, including management's assessment of
Bear Creek's plans and projects, constitutes forward-looking statements that
are subject to numerous risks, uncertainties and other factors relating to
Bear Creek's operation as a mineral exploration company that may cause future
results to differ materially from those expressed or implied in such
forward-looking statements. (*) Any reference to the potential quantity & grade
of mineralization is conceptual in nature, there has been insufficient
exploration to define a mineral resource on the property and it is uncertain
if further exploration will result in discovery of a mineral resource on the
property. Readers are cautioned not to place undue reliance on forward-looking
statements. Bear Creek expressly disclaims any intention or obligation to
update or revise any forward-looking statements whether as a result of new
information, future events or otherwise.

For further information:

For further information: Andrew Swarthout - President and CEO, or
Patrick De Witt - Investor Relations, Phone: (604) 685-6269, Direct: (604)
628-1111, E-mail:

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