Underworld's Optimized Metallurgical Testwork Returns Excellent Gold Recoveries at White Gold Property
January 05 2010 - 8:00AM
Marketwired
Underworld Resources Inc. (TSX VENTURE: UW) is pleased to announce
the results of a comprehensive metallurgical testing program on
samples from the Golden Saddle and Arc deposits, at the 100% owned
White Gold Property, Yukon.
Recovery ranged from 78% to 97% at the Golden Saddle Zone and
the comprehensive metallurgical testing indicate that 92% or better
gold recovery can be expected with a conventional plant at Golden
Saddle.
Five 72-hr bottle-roll cyanidation tests were carried out on the
samples which assessed gold recoveries based on variable grind
sizes and cyanidation intensity. CIL cyanidation boosted gold
recoveries up to 98%. Gravity recovery tests showed that from 6% to
9% of contained gold could report to a gravity concentrator prior
to cyanidation. Near-surface oxidized material returned 94% gold
recovery. Surface oxidation due to weathering at Golden Saddle
ranges from 10 to 40 meters, averaging about 20 meters below
surface. Local partial oxidation occurs near post-mineralization
fault zones. The majority of mineralization encountered to-date at
Golden Saddle is unoxidized.
Test work included several conventional processing options
including: gravity gold recovery, bottle-roll cyanidation, carbon
in leach (CIL) cyanidation and flotation. The impact of grind size
on cyanidation tests was also investigated. Test work for the
Golden Saddle Deposit was completed on core samples exhibiting
different mineralization styles, including: oxide, sulfide, mixed
oxide-sulfide material, as well as a low grade composite sample.
Testing was also completed on a composite sample from the Arc
deposit, located one kilometer south of Golden Saddle.
At the Arc zone, a 72-hr bottle roll and CIL cyanidation tests
on a composite sample suggest gold recoveries ranging from 28% to
37%, however, floatation tests boost gold recoveries to 86%.
Cyanidation at the Arc zone is impacted by graphite, which is not
present at the Golden Saddle Zone.
The metallurgical test work was completed by Inspectorate PRA
Labs of Vancouver, B.C. Bottle roll cyanide leach tests were
performed for a target grind size of 80% passing 105 microns in 1
g/L NaCN. Further details of the test work can be accessed on the
Company's website at www.underworldresources.com.
The contrasting mineralogy and gold recoveries at Golden Saddle
and Arc are due to varying host rock lithologies. Golden Saddle
occurs within metavolcanic and metaintrusive rocks, with gold
mineralization associated with pyrite veining, silicification,
quartz breccias and stockworks, whereas the Arc Deposit is hosted
by metasedimentary rocks, and is typified by hydrothermal breccias
and silicification.
Underworld is currently working on an NI-43-101 compliant
initial resource estimate for the White Gold Property, results of
which are expected within the next month.
Quality Assurance
Underworld has implemented a rigorous QA/QC program at the White
Gold Property using best industry practice. Elements of the program
include: chain of custody of samples, insertion of standard and
blank samples, and check assays. Drill core is sawn in half and
shipped in sealed bags to ALS Chemex Laboratories in Vancouver,
B.C. Check assays are being undertaken by Acme Laboratories,
Vancouver. Optimized metallurgical testing is being undertaken by
Inspectorate PRA laboratories, Vancouver, under the guidance of JDS
Energy & Mining Inc.
The Company's Exploration Program is being directed by Adrian
Fleming, M.A.I.G, RPGeo, M.Aus.I.M.M., President of Underworld
Resources and a Qualified Person as defined by NI 43- 101. Mr.
Fleming prepared, and approves of the content of this release.
Underworld Resources is a well-structured junior exploration
company focused on expanding its new gold discovery in the Yukon.
For further information contact Jeff Sundar, Investor Relations at
604-684-4001.
ON BEHALF OF THE BOARD OF DIRECTORS
Adrian Fleming, President
Forward Looking Statement
Some of the statements contained in this press release are
forward-looking statements. Forward-looking statements are not
historical facts and are subject to a number of risks and
uncertainties beyond the Company's control, including, but not
exclusively, statements regarding potential mineralization,
exploration results, completion of work program and studies, and
future plans and objectives of the Company. Resource exploration,
development and operations are highly speculative, characterized by
a number of significant risks, which even a combination of careful
evaluation, experience and knowledge may not eliminate, including,
among other things, unprofitable efforts resulting not only from
the failure to discover mineral resources but from finding mineral
deposits which, though present, are insufficient in quantity and
quality to return a profit from production.
The TSX Venture Exchange does not accept responsibility for the
adequacy or accuracy of this release.
Contacts: Underworld Resources Inc. Jeff Sundar Investor
Relations 604-684-4001 604-484-7155 (FAX) Email:
info@underworldresources.com Website:
www.underworldresources.com
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