DNI METALS INC. (DNI : TSX-Ven)(DG7 : Frankfurt)
TORONTO, Feb. 27, 2012 /CNW/ - DNI Metals Inc. (DNI:TSX-Ven)(DG7:FSE) 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
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%,
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
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.
SOURCE DNI Metals Inc.
For further information:
DNI Metals Inc. - Shahe Sabag, President & CEO (416-595-1195) or Denis Clement, Chairman (416-364-1909) email email@example.com. Also visit www.dnimetals.com.