African Gold Group, Inc., Bulk Metallurgical Testing of Composite RC Drill Intervals That Emulate Kobada Deposit Completed: V...
17 Décembre 2013 - 3:00PM
Marketwired
African Gold Group, Inc., Bulk Metallurgical Testing of Composite
RC Drill Intervals That Emulate Kobada Deposit Completed: Visible
Gold Observed in 100% of Sample Concentrates
TORONTO, ONTARIO--(Marketwired - Dec 17, 2013) - African Gold
Group, Inc. ("AGG" or the "Company") (TSX-VENTURE:AGG) is pleased
to announce that a team of engineers, under the direction of
Bumigeme Inc., has completed the metallurgical test work associated
with processing a total of 128 composite reverse circulation ("RC")
drill intervals that emulate the Kobada deposit from surface down
through to fresh bedrock. All samples are compiled from Reverse
Circulation ("RC") drill cuttings that represent between 30 meters
and 50 meters of drill intercepts, derived from one or more holes,
within a specific horizon or layer of mineralization, within the
deposit. Each of the processed samples weighed between 0.8 to 1.5
metric tonnes. The longer the drill intercept(s) for a given sample
the greater the weight of the respective sample.
A total of 500 samples had originally been identified by AGG's
technical team for processing through a fully constructed and
commissioned pilot plant. The plant, specifically designed for
metallurgical research, has a capacity throughput of up to 2 tonnes
per hour.
Metallurgical Engineers, onsite at Kobada, have reached a
consensus that further testing of composite bulk samples of RC
drill intercepts, beyond the 128 samples just completed, would be
redundant. Essentially, the 128 processed samples represent testing
the Kobada deposit over 800 meters of drilled strike length from
surface through the oxidized profile measuring approximately 100
vertical meters in depth, into fresh bedrock.
Significantly, the average grade of the 128 sample population
that has just been processed through the gravimetric pilot plant
was approximately 0.4 g/t Au, based on Leachwell given grade.
Furthermore, 75 of the 128 sample population, representing 59% of
the total sample population, had a grade that was less than 0.3 g/t
Au or below cutoff grade and therefore classified as waste
material, based on sample support derived from RC drilling and lab
results based on 2 kg Leachwell analysis.
The Company is pleased to report that visible gold ("VG") has
been reported in 100% of the concentrates as well as 100% of the
tails of the 128 bulk samples that have been processed through the
gravimetric pilot plant. AGG's Senior Geologist, Pierre Lalande
reports that approximately 50% of the 128 sample concentrates
contain a range of five to six coarse gold grains that collectively
comprise greater than 50% of the weight of visible gold contained
within the respective concentrate. The balance of the gold
contained within the respective concentrate from the above stated
population consists of a range of 200 - 300 grains of fine gold.
(http://media3.marketwire.com/docs/agg1217fig1.jpg)
The three primary objectives of the metallurgical test program
are to validate the following:
- Demonstrate that analyzing the gold grade based on 0.8 to 1.5
metric tonne samples should result in a higher gold grade being
reported as compared to analyzing the same drill interval based on
50 g FA and/or 2 kg Leachwell analysis. (It is important to
increase both the "sample support" (volume of material) and
"aliquot" (amount of material actually analyzed) to counteract the
"nugget effect" at Kobada.)
- Generate further confirmation that a Bulk Mining model applies
to Kobada and that all material contained within the mineralized
structural corridor should be processed through the gravimetric
gold recovery plant - including material that is defined as waste
based on drill sample support and Leachwell analysis.
- Study and evaluate the gravimetric process for gold recovery
for the Kobada project with a process that emulates commercial
operation. It should be noted that gravimetric process
modifications will ultimately be adopted to reduce gold content
contained within tailings.
Each of the 128 samples that have been processed through the
gravimetric pilot plant will be subjected to 1,000 g screen
metallic fire assay of the head sample, as well as, the
concentrate(s) and the tail(s). AGG anticipates all samples
associated with this body of metallurgical test work will be
shipped to the lab prior to year end. Test results will be reported
upon receipt of results from the lab.
The results of this body of metallurgical test work represent an
important phase of work that is essential to concluding AGG's
Feasibility Study for a 1,500 tonne/day gravity (gold recovery)
plant for Kobada.
Please activate the link below to view a gallery of images of
AGG's Pilot Plant - onsite at Kobada, Mali.
http://www.africangoldgroup.ca/index.php?option=com_joomgallery&func=detail&id=74&Itemid=56#joomimg
It is important to note that 100% of the mineralized material
from surface through to the lower saprolite horizon is completely
oxidized. It is anticipated that the transition zone of the deposit
will also be amenable to a gravity process of gold recovery as it
is significantly oxidized. Of equal importance in anticipating a
high gold recovery rate utilizing gravity processing at Kobada is
the fact the oxide zone does not require grinding (only scrubbing).
Furthermore, all previous metallurgical test work, including
laboratory tests of bulk sample(s) and field testing of
approximately 1,200 samples, with an average weight of 10 kg per
sample, derived from RC drill cuttings from various layers of the
deposit, have yielded high rates of gold recovery, utilizing
gravity processing.
Metallurgical Work To Focus On Testing Bulk Samples From
Lateritic Profile
AGG's technical team has shifted its focus to generating bulk
samples that are derived from the lateritic profile of the deposit.
The lateritic profile measures in a range of 1 meter, up to
approximately 10 meters in total thickness and is situated
immediately below the iron enriched surface of in situ material. As
of this date, AGG has processed a total of four, one tonne samples,
from the lateritic profile. The processing of all four samples
yielded visible gold in both the concentrate(s) and the tails, of
each respective sample. One of the four samples was generated from
the Gossokorodji ("Gosso") region, situated 5 kilometers east of
the Zone 1 main deposit. Multiple grains of coarse gold were
observed and the total visible gold content was measured to weigh
1.51 g/t Au.
(http://media3.marketwire.com/docs/agg1217fig2.jpg)
AGG notes the presence of an abundance of evidence, consisting
of historical and current artisanal mining that would suggest a
significant resource, contained within the first 10 meters of the
Kobada concession, may have not been detected by analytical
procedures to date, due to the nugget effect. Testing bulk samples
from this region over several kilometers of strike length and
laterally for kilometers across strike will be our immediate
focus.
Updated Resource Estimate Highlights (June 18, 2013)
- 2,306,000 Oz Au Measured and Indicated resources (contained
within 80.61 million tonnes at 0.87 g/t Au using a 0.3 g/t Au
cutoff) derived from drilling on 25m x 25m centers over a total of
3,200 meters of strike length between sections 600S and 3,800S,
representing an 88% increase in infill drilled strike length
relative to the 1,700 meters of strike length reported in the 2011
Inferred resource estimate.
- 542,000 Oz Au Inferred Resource (contained within 17.88 million
tonnes at 0.94 g/t Au, using a 0.3 g/t Au cutoff), predominantly
contained from within the Sulphide portion of Zone 1. Included,
186,000 Inferred ounces reported for the Foroko North Deposit (5.16
million tonnes at 1.13 g/t Au at a 0.3 g/t Au cutoff). Foroko North
is a satellite deposit situated on a separate and distinct
structure from Zone 1. It represents one of seven airborne
geophysical targets generated by the 2010 airborne survey.
- Average grade of 0.87 g/t Au reported in the updated resources
estimate represents a 10% increase in grade as compared to the
average grade of 0.79 g/t Au reported in the 2011 resource estimate
that formed part of AGG's PEA.
- Further potential remains to significantly increase both the
oxide and sulphide resources along strike and at depth for both
Kobada, Zone 1 and Foroko North deposits and elsewhere on the 215
sq km concession where airborne geophysical and geochemical
anomalies coincide with extensive areas of gold diggings.
Please click here to view the complete press release detailing
AGG's updated resource estimate, published June 18, 2013.
African Gold Group, Inc., based in Toronto, Canada, is fully
focused and committed to putting its Kobada, Mali gold project into
production.
Additional information is available on the Company's website at
www.africangoldgroup.com and on www.sedar.com and through the
Company's offices at Sun Life Financial Tower, Suite 2518, 150 King
St. West, Toronto, Canada, M5H 1J9.
On Behalf of the Board:
Michael A. J. Nikiforuk, President, Director
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.
African Gold Group, Inc.Michael A. J. Nikiforuk(647)
288-0453majn@africangoldgroup.comwww.africangoldgroup.com
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