African Gold Group, Inc., Reports 65% Increase in Gold Grade From Bulk Metallurgical Test Results at Kobada, Mali
11 Février 2014 - 3:00PM
Marketwired
African Gold Group, Inc., Reports 65% Increase in Gold Grade From
Bulk Metallurgical Test Results at Kobada, Mali
Results Support Significant Nugget Effect
TORONTO, ONTARIO--(Marketwired - Feb 11, 2014) - African Gold
Group, Inc., ("AGG" or the "Company") (TSX-VENTURE:AGG) is pleased
to report the analytical results for the first 50 bulk
metallurgical test samples that were comprised of composites of
reverse circulation ("RC") drill intervals that were specifically
selected to emulate the Kobada deposit, from surface down through
to fresh bedrock.
Each bulk sample consisted of drill cuttings from one or more RC
drill holes, within a specific horizon or layer of mineralization
emanating from drill intervals that ranged between 30 to 50 meters
in length and weighed between 0.8 up to 1.5 metric tonnes.
HIGHLIGHTS
- Average calculated gold grades of the 50 individual bulk
composite samples, processed through the gravimetric pilot plant,
yielded gold grades 65% higher than the average given gold grade,
based on 2 kg Leachwell analysis, from the identical drill
interval.
- 28 of the 50 bulk composite samples were classified as waste,
averaging 0.085 g/t Au, based on 2 kg leachwell analysis, of the
drilled interval(s). The calculated average grade of the bulk
samples processed through the gravimetric pilot plant, for the
identical drill interval(s), averaged 0.299 g/t Au, representing a
252% increase in gold content from the identical drill
interval(s).
- Pilot plant test results continue to confirm that increasing
"sample support" (volume of material) and "aliquot" (the actual
amount of material analyzed) is highly beneficial for improving the
overall grade of mineralization of the Kobada deposit, a
characteristic of the "nugget effect."
- Pilot plant test results continue to confirm that a Bulk Mining
model applies to Kobada and that all material contained within the
(mineralized) structural corridor is envisioned to be processed
through a gravimetric gold recovery plant - including material that
is defined as waste, based on drill sample support and Leachwell
analysis.
Table 1 Illustrates the analytical results for the calculated
gold grade based on processing the individual composite bulk
samples through the onsite Pilot Plant; the comparative average
analytical results from RC drilling for the identical drill
interval(s), based on 2 kg leachwell analysis and the ratio of the
Pilot Plant calculated grade relative to the given grade, based on
2 kg leachwell analysis, for RC drilling over the identical drill
interval.
TABLE
1 |
|
|
Given Grade: |
Calculated Grade: |
Ratio: |
|
Lab Results From |
Based On |
Pilot Plant |
|
RC Drilling Based On |
Processing Bulk |
Analysis/RC |
Bulk Sample |
2 KG Leachwell |
Samples Thru Pilot |
Drilling |
Composite ID |
Analysis (g/t Au) |
Plant (g/t Au) |
Analysis |
KBPP12-081 |
0.026 |
0.085 |
3.3 |
KBPP12-079 |
0.01 |
0.071 |
7.1 |
KBPP12-112 |
0.028 |
0.082 |
2.9 |
KBPP12-103 |
0.439 |
5.090 |
11.6 |
KBPP12-111 |
0.496 |
0.873 |
1.8 |
KBPP12-091 |
0.223 |
0.896 |
4.0 |
KBPP12-063 |
0.032 |
0.122 |
3.8 |
KBPP12-008 |
1.103 |
1.375 |
1.2 |
KBPP12-047 |
0.451 |
1.326 |
2.9 |
KBPP12-044 |
0.54 |
0.493 |
0.9 |
KBPP12-048 |
1.431 |
2.348 |
1.6 |
KBPP12-037 |
0.012 |
0.196 |
16.3 |
KBPP12-045 |
0.156 |
0.681 |
4.4 |
KBPP12-014 |
0.04 |
0.080 |
2.0 |
KBPP12-046 |
0.101 |
0.214 |
2.1 |
KBPP12-069 |
0.488 |
0.684 |
1.4 |
KBPP12-108 |
0.038 |
0.124 |
3.3 |
KBPP12-086 |
0.212 |
0.228 |
1.1 |
KBPP12-061 |
0.018 |
0.298 |
16.5 |
KBPP12-109 (1) |
0.096 |
0.360 |
3.7 |
KBPP12-121 |
0.782 |
0.220 |
0.3 |
KBPP12-089 |
0.378 |
0.406 |
1.1 |
KBPP12-092 |
0.798 |
0.532 |
0.7 |
KBPP12-095 |
0.488 |
0.746 |
1.5 |
KBPP12-059 |
0.017 |
0.446 |
26.3 |
KBPP12-065 |
0.361 |
0.416 |
1.2 |
KBPP12-094 |
0.624 |
0.754 |
1.2 |
KBPP12-072 |
3.314 |
0.873 |
0.3 |
KBPP12-090 |
0.144 |
0.243 |
1.7 |
KBPP12-006 |
0.967 |
0.465 |
0.5 |
KBPP12-027 |
0.388 |
0.615 |
1.6 |
KBPP12-023 |
0.187 |
0.737 |
3.9 |
KBPP12-085 |
0.436 |
0.390 |
0.9 |
KBPP12-106 |
0.113 |
0.631 |
5.6 |
KBPP12-018 |
0.096 |
0.065 |
0.7 |
KBPP12-028 |
0.039 |
0.311 |
8.0 |
KBPP12-062 |
0.026 |
0.541 |
20.8 |
KBPP12-002 |
0.134 |
0.288 |
2.1 |
KBPP12-142 |
0.504 |
0.581 |
1.2 |
KBPP12-146 |
0.022 |
0.072 |
3.3 |
KBPP12-124 |
0.637 |
0.699 |
1.1 |
KBPP12-128 |
0.036 |
0.069 |
1.9 |
KBPP12-138 |
0.19 |
0.355 |
1.9 |
KBPP12-153 |
0.072 |
0.159 |
2.2 |
KBPP12-104 |
0.091 |
0.155 |
1.7 |
KBPP12-154 |
0.051 |
0.564 |
11.1 |
KBPP12-152 |
0.171 |
0.296 |
1.7 |
KBPP12-113 |
0.384 |
0.510 |
1.3 |
KBPP12-125 |
0.364 |
0.991 |
2.7 |
KBPP12-126 |
0.57 |
1.635 |
2.9 |
Figure 1 represents a graphic depiction of the results contained
in Table 1 above. To view Figure 1, please visit the following
link: http://media3.marketwire.com/docs/agg_figure_01_feb11.pdf
"We are extremely pleased with the test results from this first
batch of 50 bulk composite samples. Essentially, these test results
exceeded our expectations by generating a 65% increase in reported
gold grade from the identical drill interval(s). These results
re-confirm that increasing sample support and aliquot size is
highly beneficial for demonstrating the potential of improving the
overall grade of mineralization of the Kobada deposit. All of which
validates our investment in our onsite gravimetric pilot plant and
the viability of our proposed Bulk Mining model for Kobada. In
light of these highly positive results, AGG plans the initiation of
another round of pilot plant tests, to commence in April. These
tests will concentrate our efforts on near surface material, more
specifically, the first 30 vertical meters from surface, which is
comprised of a nearly equal proportion of lateritic hardpan
overlying saprolite. Interestingly, we observe lab analysis of
drill intervals from within this hardpan zone average less than the
0.3 g/t Au cut-off of AGG's 2013 resources update, while at the
same time, this very same material has proven to be the preferred
material for artisanal or local miners. We hypothesize that this
first 10 meters of the Kobada deposit, containing the lateritic
hardpan, is potentially significantly understated, based on 2 kg
lab analysis of drill intervals. Our goal is to determine that much
larger bulk samples, up to 10 tonnes in weight, could produce much
higher gold grades, within the hardpan zone, relative to results
derived from 2 kg leachwell of drill intervals," states AGG
Director, Pierre Lalande, P.Geo.
The Nugget Effect
"On a technical note, a characteristic of the Kobada deposit is
the significant amount of coarse gold that is contained within the
deposit and surrounding environment. When one considers the extent
of artisanal gold diggings, throughout Kobada, plus our preliminary
metallurgical studies and the comparative results derived from our
QA/QC programs, that form part of our drill campaigns dating back
to 2005, one can conclude the collective evidence highlights the
large statistical "nugget effect". 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. Since 2009, AGG commenced both a higher grid density of
drilling with larger diameter holes and employed analytical
procedures using larger amounts of material subjected to analysis
(Leachwell on 2,000 g versus Fire Assay on 50 g). Our 2012
Feasibility Study drill program increased drill density to 25 meter
centers from the 50 meter centers (reported in 2011). All drill
analysis was based on 2,000 g Leachwell and it is this protocol
combination that has resulted in AGG reporting a 10% increase in
gold grade, relative to our 2011 resource estimate," states AGG
President, Michael A. Nikiforuk.
The analytical test results for the remaining balance of the
composite bulk samples will be reported upon receipt of lab
analytical results.
Sampling Protocol
Representative samples of the feed material, plant screen
oversize and tails and entire concentrates were sent for analysis
to Activation Laboratories by 100-mesh metallics screened fire
assay on 1000-g aliquot. One sample in 20 was further analyzed by
Leachwell on 2,000-g aliquot as part of the QA/QC program.
Qualified Persons
The bulk metallurgical testing program was executed under the
supervision of Mr. Florent Baril, P. Eng., Metallurgical Engineer.
Mr. Baril is the CEO of Bumigeme Inc., a consulting engineering
group, located in Montreal, Canada. Mr. Baril is a Qualified
Persons under National Instrument 43-101 and has approved the
technical information contained in this release.
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 activate the link to view the complete press release
detailing AGG's updated resource estimate, published June 18, 2013:
http://www.africangoldgroup.com/index.php?option=com_content&view=article&id=311:african-gold-group-inc-updated-resources-estimate-for-kobada-gold-project-surges-to-23-million-oz-au-measured-a-indicated-a-540000-oz-au-inferred-gold-grade-increases-10-to-087-gt-au&catid=66:2013&Itemid=189
African Gold Group, Inc., based in Toronto, Canada, is focused
on 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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