U3O8 Corp. Reports Positive Metallurgical Results With 82% Uranium Recoveries from the Kurupung Project, Guyana
26 Luglio 2011 - 12:45PM
Marketwired
U3O8 Corp. (TSX VENTURE: UWE), a Canadian-based company, focused on
exploration and resource expansion of uranium and associated
commodities in South America, reports uranium recoveries of 82%
from the first phase of ongoing metallurgical testwork on the
Kurupung Project in Guyana by SGS Minerals Services ("SGS") in its
Lakefield, Ontario, laboratory.
"These positive initial metallurgical results constitute an
important step in advancing the Kurupung Project from a uranium
discovery to a deposit of significant potential value," said Dr.
Richard Spencer, U3O8 Corp's President and CEO. "A broad framework
has now been established through which uranium can be extracted
from the host rock and serves as a baseline from which additional
metallurgical testing aims to refine and improve the efficiency of
the extraction process. Infill drilling also continues to progress
well in the Aricheng area towards our goal of increasing our
current National Instrument 43-101 ("NI 43-101") resource on the
Kurupung Project by the end of 2011(1)."
Metallurgical Testwork
The metallurgical testing was conducted on hard-rock core
samples from 24 bore holes in the Aricheng North and Aricheng South
deposits(1) of the Kurupung Project. These bore holes are
representative of potential bulk ore and include a range of samples
from low-grade to high-grade material. The individual samples were
shipped from Guyana to SGS's facility in Lakefield, Ontario, where
they were blended together to form one composite sample that has a
grade of 0.1% U3O8.
The composite sample material was ground to a nominal 100
micrometres. Flotation was used to separate the bulk of the
carbonate from the sample, which generated a high-carbonate
fraction (approximately 20% of the original sample mass) and a
low-carbonate fraction (about 80% of the original sample mass). The
two fractions required different processing and leaching techniques
as follows:
-- Low-carbonate fraction: The low-carbonate fraction, that contains
approximately 80% of the uranium, was re-ground to about a 40 micrometre
grain size and leached at a temperature of 95 degrees C. Uranium
extraction was 85% after eight hours, increasing to 91% after 24 hours
and to 93% after 72 hours. This equates to a uranium recovery of 74%
(93% extraction of 80% of the original sample). 208 kilograms ("kg") of
acid per tonne of whole ore had been added by the 24-hour mark, of which
50 grams per litre (equivalent to 100kg per tonne) remained in solution
and would be available for recycling. Assuming a conservative 80% of the
acid is recycled, net acid demand would be in the range of 144kg per
tonne of whole ore.
-- High-carbonate fraction: The high-carbonate fraction was subjected to
alkaline leaching, in which a mixture of sodium carbonate and
bicarbonate is used as the leach reagent instead of acid. The high-
carbonate fraction contains about 20% of the uranium and yielded
recoveries of 37.5% on material ground to 100 micrometres and 42% on the
re-ground material (40 micrometre grain size). This equates to 8%
recovery on a whole ore basis, contributing to a total uranium recovery
of 82% (74% through acid leach + 8% from alkaline leach). There was
little sulphate dissolved in the carbonate leach tests indicating modest
reagent consumption.
Testwork is ongoing to refine these broad initial metallurgical
results. Planned tests aim to increase the efficiency of the
flotation process used to separate the majority of uranium-bearing
minerals from carbonate minerals, the principal consumer of acid.
Greater efficiency in the flotation process should lead to a
further reduction in acid consumption. Further work also aims to
optimize the acid and carbonate leach steps applied to the
flotation products.
Mr. John Goode, P.Eng., a Qualified Person within the definition
of that term in NI 43-101 of the Canadian Securities
Administrators, has overseen the metallurgical test work carried
out by SGS, and verified the technical information relating to the
tests from which results are reported in this press release. Dr.
Richard Spencer, P. Geo., President & CEO of U3O8 Corp., a
Qualified Person within the definition of that term in NI 43-101 of
the Canadian Securities Administrators, has supervised the
preparation of, and verified the technical information relating to
the Kurupung Project provided above.
SGS has been undertaking metallurgical testwork for over 50
years and its Lakefield facility is ISO/IEC 17025 accredited.
About U3O8 Corp.
U3O8 Corp. is a Toronto-based exploration company, focused on
exploration and resource expansion of uranium and associated
commodities in South America - a promising new frontier for uranium
exploration and development. U3O8 Corp. has one of the most
advanced portfolios of uranium projects in the region comprising NI
43-101 compliant resources in Guyana and Argentina to significant
historic resources in Colombia.
(1)Scout drilling results suggest that the ten Kurupung structures
identified to date may contain a conceptual target of 13-18 million
tonnes at a grade of 0.08% to 0.10% U3O8 (estimated 30 to 35 million
pounds ("mlb") U3O8) including the initial NI 43-101 resource estimate.
The initial NI 43-101 resource estimate of 5.8mlb Indicated at an
average grade of 0.10% (2.0 lbs/st) U3O8 and 1.3mlb Inferred at an
average grade of 0.09% (1.9 lbs/st) U3O8 has been reported on the
Aricheng North and Aricheng South structures in the Kurupung Batholith.
Refer to the technical report dated January 14, 2009 titled "A Technical
Review of the Aricheng North and Aricheng South Uranium Deposits in
Western Guyana for U3O8 Corp. and Prometheus Resources (Guyana) Inc.",
available on U3O8 Corp's web site at http://www.u3o8corp.com/ and on
SEDAR at http://www.sedar.com/.
Forward-Looking Statements
Certain information set forth in this news release may contain
forward-looking statements that involve substantial known and
unknown risks and uncertainties. These forward-looking statements
are subject to numerous risks and uncertainties, certain of which
are beyond the control of U3O8 Corp., including, but not limited
to, the impact of general economic conditions, industry conditions,
volatility of commodity prices, risks associated with the
uncertainty of exploration results and estimates, metallurgical
test results and that the resource potential will be achieved on
exploration projects, currency fluctuations, dependence upon
regulatory approvals, and the uncertainty of obtaining additional
financing and exploration risk. There is no assurance that the
Kurupung Project will add to U3O8 Corp's resource base in the
short-term, or at all. Readers are cautioned that the assumptions
used in the preparation of such information, although considered
reasonable at the time of preparation, may prove to be imprecise
and, as such, undue reliance should not be placed on
forward-looking statements.
To view the image associated with this press release, please
visit the following link:
http://www.marketwire.com/library/20110725-U308_800.jpg
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.
Add to Digg Bookmark with del.icio.us Add to Newsvine
Contacts: U3O8 Corp. Nancy Chan-Palmateer Vice President,
Investor Relations (416) 868-1491 nancy@u3o8corp.com U3O8 Corp.
Richard Spencer President & CEO (416) 868-1491
richard@u3o8corp.com www.u3o8corp.com
Grafico Azioni U3O8 (TSXV:UWE)
Storico
Da Mag 2024 a Giu 2024
Grafico Azioni U3O8 (TSXV:UWE)
Storico
Da Giu 2023 a Giu 2024