Underworld's Initial Metallurgical Test Results Show Excellent Gold Recoveries
30 Septembre 2009 - 3:00PM
Marketwired
Underworld Resources Inc. (TSX VENTURE: UW) is pleased to announce
that it has received non-optimized initial metallurgical testwork
from the Golden Saddle and Arc gold deposits, at the White Gold
Property. These results returned excellent gold recoveries from the
Golden Saddle Zone.
At the Golden Saddle Zone, a total of 23 samples from six 2008
drill holes averaging 6.60 g/t Au were analyzed by bottle roll
cyanide leach methodology. All samples returned an average 85.5%
recovery, ranging from 65.7 to 93.7%. Samples included near-surface
oxidized material, partially oxidized, and unoxidized material.
Unoxidized and partially oxidized mineralization returned higher
recoveries, averaging 87.7%, with oxidized mineralization averaging
73.6%. Additionally, higher grade individual samples, over 10 g/t
Au, typically displayed slightly lower recoveries averaging 83.7%.
This is potentially due to reduced leaching with coarse gold, which
could possibly be amenable to gravity separation to boost
recoveries.
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.
At the Arc Zone, a total of 17 samples from two 2009 drill holes
averaging 2.05 g/t Au were analyzed from the two styles of
mineralization: graphite poor (WD09-39) and graphite rich
(WD09-37). All samples averaged 51.2% recovery; however, gold
mineralization without graphite averaged 81.7% recovery. The
presence of 'preg-robbing' graphite resulted in poor recovery,
averaging 4.6%. Graphite often occurs within sediment-hosted gold
deposits, and can be removed using various metallurgical
processes.
The Golden Saddle deposit is located 1,000 meters north of the
Arc Deposit. The two deposits display different styles of gold
mineralization, geochemistry and host rocks. Golden Saddle occurs
within metavolcanic and intrusive rocks, with gold mineralization
associated with pyrite veining, silicification, quartz breccias and
stockworks, whereas the Arc Deposit is hosted with metasedimentary
rocks, and is typified by hydrothermal breccias and
silicification.
The different styles of mineralization and gold recoveries at
Golden Saddle and Arc are due to varying host rock lithologies. The
principal host rock at Golden Saddle was a granitoid that has been
metamorphosed to an augen gneiss. Arc mineralisation is hosted by
sediments which now outcrop as quartzite.
Underworld has initiated an optimized metallurgical testing
program with Inspectorate PRA Metallurgical Division of Richmond
BC, with results expected during the latter part 2009. Samples from
the multiple styles of mineralization at the White Gold Property
will be analyzed for cyanide leach, gravity recovery and Bond Work
Index. Optimization studies such as gravity recovery have the
potential to boost overall metallurgical recoveries.
Underworld is currently awaiting assay results from an
additional 32 holes at the White Gold Project. At Golden Saddle,
Mineralization remains open to expansion along strike to the
northeast and at depth
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. Bottle Roll cyanide-leach analysis from the 2008 samples
were performed by Alaska Assay Labs in Fairbanks, AK, and for 2009
samples by ALS Chemex Laboratories in Vancouver, B.C.
The ongoing 2009 Exploration Program is 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)
info@underworldresources.com www.underworldresources.com
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