Xtra-Gold Resources Corp.: Kibi Gold Project Receives Positive Initial Metallurgical Results With 97% Gold Recovery
2011年10月25日 - 9:05PM
Xtra-Gold Resources Corp. ("Xtra-Gold" or the
"Company") (TSX:XTG) (OTCBB:XTGR), has received a very
positive, preliminary metallurgy report from SGS South Africa (Pty)
Ltd. ("SGS") in connection with a gold deportment study aimed at
characterizing the gold in sulphide and oxide (saprolite)
mineralization from the Big Bend Gold Zone in order to make
recommendations on a process route to maximize gold recoveries.
Approximately 10 kg of sample G478923 sulphide material (drill
core) and 10 kg of composite oxide (saprolite) material were
utilized for the test work. The composite oxide sample was created
by SGS from trench samples that were crushed and combined.
The mineralogical test work consisted of a modified gold
deportment study which included metallurgical and mineralogical
tests. The objective of the study was to gain an understanding
of the nature and mode of occurrence of the gold in each
sample. The study included:
- test work to determine the amenability of the ore to gravity
recovery
- gold distribution across size fractions (grading analysis)
- heavy liquid separation to determine the amount of free gold or
gold in heavy particles such as sulphides
- exposure and mineral association analysis of the particulate
gold grains in the gravity concentrate
- chemical composition of the ore and metallurgical test
products
- general mineralogical characterization of the ore
- identification and quantification of gold minerals including
native gold, gold-tellurides, etc. in the gravity concentrate
- grain size distribution of the gold grains in the gravity
concentrate
- test work to determine the gold recovery by direct cyanidation;
and
- diagnostic leach analysis of the gravity tailings in order to
determine the gold deportment in the gravity tails
SGS made the following preliminary gold recovery conclusions in
their report:
"The gold in the G478923 gold ore samples (3.49 g/t Au) is
highly amenable to cyanidation leaching with ~97% recoverable by
means of direct cyanidation. This ore is also amenable to
gravity upgrading, with ~67% of the gold recovered at a mass pull
of ~3%. In the gravity concentrate (97.5 g/t Au), a total of
143 particulate gold grains were observed in the gravity
concentrate of this sample.
"The grading analysis on the G478923 gold ore sample indicated a
very high upgrading of gold in the +106 micrometre size fraction
(~69%). This indicates that the gold is either large gold
grains or locked in large gold-bearing particles. From the
liberation and mineral association characteristics determined by
QEMSCAN, on the gravity concentrate, the gold was found to be ~63%
liberated and ~25% was associated with pyrite. This indicates
that the gold is either large, liberated gold grains or locked in
large gold-bearing pyrite particles.
"The direct cyanidation and diagnostic leach indicates that the
sample is highly amenable to cyanide leaching, with ~97% of the
gold recovered from the head sample at a grind of 80%-75
micrometre by direct cyanidation and ~96% for the gravity
tailings at a grind of ~50%-75 micrometre. This is
corroborated by the exposure and the mineral association
characteristics as determined by QEMSCAN analysis of the gravity
concentrate. Approximately 90% of the particulate gold grains
are ≥10% exposed and should be leachable.
"The gold in the composite gold ore sample (7.28 g/t Au) is also
highly amenable to cyanidation, with ~97% of the gold recoverable
by means of direct cyanidation. This ore is also amenable to
gravity upgrading, to some degree, with only ~56% of the gold
recovered at a mass pull of ~3%. In the gravity concentrate
(134.83 g/t Au) a total of 125 particulate gold grains were
observed by QEMSCAN.
"The grading analysis on the composite gold ore sample indicated
a very high upgrading of gold in the +106 micrometre size
fraction (~74%). This indicates that the gold is either large
gold grains or locked in large gold-bearing particles. From
the liberation and mineral association characteristics determined
by QEMSCAN analysis of the gravity tailings, it was found that the
gold grains were moderately liberated (~76%) and that ~10% was
occurring in silicates and ~14% in oxides. This indicates that
the gold is either large, liberated gold grains or locked in large
gold-bearing silicate/oxide particles.
"The direct cyanidation and diagnostic leach tests indicated
that the sample is highly amenable to cyanide leaching, with ~98%
of the gold recovered from the head sample at a grind of 80%-75
micrometre and ~99% of the gold in the gravity tailings at a
grind of 50%-75 micrometre. This is corroborated by the
exposure and mineral association characteristics of particulate
gold in the gravity concentrate, as determined by QEMSCAN
analysis. Approximately ~96% of the gold grains are ≥10%
exposed and should be leachable.
"The most simplistic processing option would be to mill the ore
to ~80%-75 micrometre followed by Carbon-in-leach (CIL)
cyanidation. Another option, which may result in somewhat
lower operational cost is to mill the ore relatively coarsely (say
80%-106 micrometre) followed by gravity concentration and intensive
cyanidation of the gravity concentrate. The gravity tailings
could then be milled finer to ~80%-75 micrometre, followed by
CIL. Taking out the coarse gold and some of the sulphides by
gravity, will allow shorter retention times in the leach tanks and
possibly even lower cyanide consumption."
The full SGS Metallurgy Report can be viewed on the Company's
website at www.xtragold.com.
As a result of the foregoing positive results, Xtra-Gold has
added another drill rig to accelerate development of the Kibi Gold
Project.
Yves P. Clement, P. Geo, Vice President, Exploration for
Xtra-Gold is acting as the Qualified Person in compliance with
National Instrument 43-101 ("NI 43-101") with respect to this
announcement. He has prepared and or supervised the
preparation of the scientific or technical information in this
announcement and confirms compliance with NI 43-101.
About Xtra-Gold Resources Corp.
Xtra-Gold is a gold exploration company with a substantial land
position in the Kibi greenstone belt ("Kibi Gold Belt") located in
Ghana, West Africa. The Kibi Gold Belt, which exhibits many
similar geological features to Ghana's main gold belt, the Ashanti
Belt has been the subject of very limited modern exploration
activity targeting lode gold deposits as virtually all past gold
mining activity and exploration efforts focused on the extensive
alluvial gold occurrences in many river valleys throughout the Kibi
area.
Xtra-Gold holds five (5) Mining Leases totalling approximately
226 sq km (22,600 ha) at the northern extremity of the Kibi Gold
Belt. The Company's exploration efforts to date have focused
on the Kibi Gold Project located on the Apapam Concession (33.65 sq
km), along the eastern flank of the Kibi Gold Belt.
Xtra-Gold's Kibi Gold Project consists of an over 5.5 km long
mineralized trend delineated from gold-in-soil anomalies,
geophysical interpretations, trenching and drilling along the
northwest margin of the Apapam Concession.
Forward-Looking Statements
The TSX does not accept responsibility for the adequacy or
accuracy of this release. No stock exchange, securities
commission or other regulatory authority has approved or
disapproved the information contained herein. This News Release
includes certain "forward-looking statements". These
statements are based on information currently available to the
Company and the Company provides no assurance that actual results
will meet management's expectations. Forward-looking
statements include estimates and statements that describe the
Company's future plans, objectives or goals, including words to the
effect that the Company or management expects a stated condition or
result to occur. Forward-looking statements may be identified
by such terms as "believes", "anticipates", "expects", "estimates",
"may", "could", "would", "will", or "plan". Since
forward-looking statements are based on assumptions and address
future events and conditions, by their very nature they involve
inherent risks and uncertainties. Actual results relating to,
among other things, results of exploration, project development,
reclamation and capital costs of the Company's mineral properties,
and the Company's financial condition and prospects, could differ
materially from those currently anticipated in such statements for
many reasons such as: changes in general economic conditions and
conditions in the financial markets; changes in demand and prices
for minerals; litigation, legislative, environmental and other
judicial, regulatory, political and competitive developments;
technological and operational difficulties encountered in
connection with the activities of the Company; and other matters
discussed in this news release. This list is not exhaustive
of the factors that may affect any of the Company's forward-looking
statements. These and other factors should be considered
carefully and readers should not place undue reliance on the
Company's forward-looking statements. The Company does not
undertake to update any forward-looking statement that may be made
from time to time by the Company or on its behalf, except in
accordance with applicable securities laws.
CONTACT: Paul Zyla
Chief Executive Officer
Telephone: 416-366-4227
E-mail: pzyla@xtragold.com
Website: www.xtragold.com
Xtra Gold Resources (TSX:XTG)
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から 1 2024 まで 1 2025