DNI Announces Additional Positive Leaching Results From Its Buckton Inferred Resource, Alberta
26 February 2012 - 7:35AM
PR Newswire (Canada)
DNI METALS INC. TORONTO, Feb. 27, 2012 /CNW/ - DNI Metals Inc. is
pleased to announce additional initial results from its bioleaching
testwork on drill core samples from the Buckton inferred resource
(announced Oct24/2011 and Jan16/2012) at its polymetallic black
shale projects, Athabasca Region, Alberta. The current results
reinforce conclusions from previous testwork announced on September
8, 2011, and reiterate recoveries for Mo-Ni-U-V-Zn-Cu-Co-Li. The
leaching tests also enable calculation of initial recoveries for
Specialty Metals and Rare Earth Elements (REE) which are
incidentally recovered as co-products during leaching. The results
being reported are from recently completed bench scale batch
amenability bioleaching testwork launched in 2011, carried out by
the Alberta Innovates Technology Futures (AITF, formerly the
Alberta Research Council), using 200gm samples which were tested in
duplicate to specifications formulated by DNI. A summary of the
best metal recoveries achieved during the above bioleaching tests,
as reported by AITF, are as follows: Mo-41%, Ni-89%, U-92%, V-24%,
Zn-93%, Cu-78%, Co-94%, Li-29%. The results are consistent with
results previously reported by AITF whose work focused on
Mo-Ni-U-V-Zn-Cu-Co-Li only. Recoveries for Specialty Metals and REE
incidentally leached as co-products during the testwork, as
calculated by DNI based on the difference of metal content between
head sample feed material and final tail residues per analytical
results from AITF's testwork, are as follows: La-39%, Ce-47%,
Pr-61%, Nd-66%, Sm-76%, Eu-79%, Gd-83%, Tb-88%, Dy-84%, Ho-86%,
Er-82%, Tm-73%, Yb-75%, Lu-73%, Y-85%, Th-60%, Sc-31%. The above
results are from bioleaching of composite drill core samples
representing three complete drill intercepts across the entire
thickness of the Second White Speckled Shale Buckton polymetallic
zone. The three holes (holes 11BK01, 11BK02 and 11BK04) were
drilled by DNI during the 2010-2011 winter drill program. While
prior testwork (announced September 8, 2011) had been on select
material from surface trench sampling representative of the zone,
corroboration of prior results with data from leaching of fresh
composite drill core samples reinforces prior leaching results. All
of the above results were achieved under test conditions which are
yet to be optimized and, as such, are regarded by DNI as initial
results which future work will endeavor to improve by further
optimizing and refining test parameters. One of the duplicate
samples was further leached in HCl following bioleaching to monitor
precipitation of a variety of compounds (eg: jarosites, sulfates,
ferro-compounds) and to assess related metals re-precipitation from
the leaching solution after the metals had been extracted from the
shale. As previously observed in prior bioleaching tests conducted
at AITF, the test results indicate that while a small fraction of
all dissolved metals, once leached from the shale, are removed from
the leaching solution through re-precipitation, a considerable
portion of Mo-V-Cu once leached from the shale are lost to
re-precipitation. Mitigation of these processes will be addressed
during future testwork intended to optimize test parameters to
enhance recoveries of Mo-V-Cu. Plans are underway for an expanded
leaching testwork program to start in the summer to commence
testing progressively larger samples and to formulate procedures
for separation of the various metals into final products including
separation of Specialty Metals and REE from leaching solutions once
they have been extracted from the shale. In addition to testing
samples from the Buckton polymetallic inferred resource, a
representative drill core sample of the overburden material
(LaBiche Shale) overlying the Buckton resource was also leached and
reported very encouraging recoveries for Base Metals, Specialty
Metals and Rare Earth Elements. Details of metal recoveries from
leaching of the overburden cover material, previously regarded to
be "waste" material, will be announced shortly. The Qualified
Person in connection with this press release is S.F.Sabag P.Geo,
DNI's president and CEO, who has reviewed analytical results and is
responsible for preparation of this press release. See DNI press
Sep8/2011 and Alberta Mineral Assessment Report MIN20100017 for
considerable details of procedures related to the bioleaching
testwork. Bioleaching was carried out using inoculum previously
harvested and cultured by AITF from DNI's black shale zones.
Analytical work carried out by Actlabs, Ancaster, Ontario, by
ICP-MS. The Buckton inferred resource was announced Oct24/2011 and
Jan16/2012, and technical reports related thereto are available
from www.sedar.com and www.dnimetals.com. Neither the 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. DNI -
TSX Venture DG7 - Frankfurt Issued: 66,525,202 We seek Safe
Harbour. This announcement includes forward looking statements.
While these statements represent DNI's best current judgment, they
are subject to risks and uncertainties that could cause actual
results to vary, including risk factors listed in DNI's Annual
Information Form and its MD&As, all of which are available from
SEDAR and on its website. DNI Metals Inc. CONTACT: DNI Metals Inc.
- Shahe Sabag, President & CEO (416-595-1195) orDenisClement,
Chairman (416-364-1909) email ir@dnimetals.com. Alsovisit
www.dnimetals.com.
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