Mr. Nigel Ferguson reports
AFR DRILLS 59.5 METRES OF 1.7%CU AND 0.5%CO AND 59.45 METRES OF 1.5%CU AND 0.5%CO IN DIAMOND CORE DRILL HOLES AT ITS LUISHA SOUTH PROJECT
African Metals Corp. has received final assay results
from the final six drill holes from a total of 22 diamond drill holes
completed on its Luisha South project in the Katanga provence of the
Democratic Republic of Congo.
These results confirm the continuity and grade of mineralization
identified by the June, 2010, reverse circulation (RC) drilling program,
and again lend further significant support to an upgrade to the
resource model with potential for a higher-grade copper core.
Geological consultants, Geosure Pty. Ltd., have been commissioned to rerun
the Luisha South Resource Model including the significant new data
returned from the recent diamond drilling program. The upgraded
resource report is expected to be available for reporting in May, 2011.
Highlights
New diamond core results include:
-
15.5 metres at 2.2 per cent copper, 0.8 per cent cobalt from 6.05 m (LUDH031);
- Including 4.05 metres at 3.5 per cent copper, 0.8 per cent cobalt from 16.8 m;
- 59.5 metres at 1.7 per cent copper, 0.5 per cent cobalt from 2.2 m (LUDH033);
- Including 4.35 metres at 3.4 per cent copper, 0.6 per cent cobalt from 23.1 m;
- 59.45 metres at 1.5 per cent copper, 0.5 per cent cobalt from 24.05 m (LURD017);
- Including 1.5 metres at 3.9 per cent copper, 2.9 per cent cobalt from 67.8 m.
Luisha South diamond drilling
Rubaco SPRL and DrillTek SPRL, drilling contractors, combined to
complete a total of 1,538.73 metres of diamond core drilling from 22
holes at the Luisha South project in January, 2011. The holes targeted
the downdip and southeast extensions of mineralization highlighted by
the March, 2010, geochemical sampling program and the June, 2010, RC
drilling program.
The RC drill program enabled a JORC- and NI43-101-compliant resource
estimation of the Luisha pit mineralization, resulting in an inferred
resource of 5.8 million tonnes at 1.3 per cent copper and 0.4 per cent cobalt for
75,400 tonnes of contained copper metal and 23,200 tonnes of contained
cobalt metal (using a cut-off of 0.5-per-cent copper).
Some initial RC drill holes either terminated within, or short of the
expected copper- and cobalt-mineralized horizons, producing substantial
interpolation gaps in the resource block model. The diamond holes in
the most recent program were designed to infill the gaps and further
define the extents of the mineralization and to allow an upgrade in the
reported mineral resource calculation.
The reported analytical results are from six holes -- four cored as new
holes in the base of the open pit, and two cored as regional holes
targeting copper in soil geochemical anomalies. Results from 13 holes have been reported previously, while three holes
have not been sampled (LURC030 due to poor recoveries, LUDH034 as it
intersected unmineralized units of basal red RAT, and LURD018 as the
hole collapsed with poor recoveries).
All four of the holes collared in the base of the pit intersected
persistent intervals of copper and cobalt mineralization. The
mineralization is mainly chalcopyrite and carrolite with occurrences of
malachite and heterogenite (non-sulphide copper and cobalt minerals
respectively) visible in the upper portions of the holes. Drill hole
LURD017 was cored from surface, after the RC precollar LURC017 had
collapsed preventing re-entry.
The mineralization is hosted within the mines Series R2 stratigraphy. Stratigraphic
horizons known to host significant mineralization at other mine sites
within the Katanga provence, including Tiger Resources' Kipoi mine
located approximately 7.5 kilometres along strike to the southeast.
The higher-grade assay results from samples collected from this
stratigraphic sequence suggest a possible higher-grade core of copper
and cobalt mineralization. The mineralization is currently open at
depth, to the south and to the southeast. Further step-out
drilling is planned for the coming dry season which commences in May.
Mineralization styles observed in the core includes both syngenetic
(bedding parallel and disseminated fine pyrite lenses and blebs
replaced by chalcopyrite and carrolite) and epigenetic (fracture- and
vein-hosted sulphides).
DIAMOND CORE -- ANOMALOUS INTERCEPTS BASED
ON A CUT-OFF OF 0.5 PER CENT CU
Hole No. Width (metres) Cu % Co %
LUDH028 41.5 1.1 0.4
LUDH029 - - -
LUDH031 15.5 2.2 0.8
LUDH031 4.05 3.5 0.8
LUDH033 59.5 1.7 0.5
LUDH033 4.35 3.4 0.6
LURD017 14.85 1.6 0.5
LURD017 59.45 1.5 0.5
LURD017 1.5 3.9 2.9
LURD017 2.6 3.5 0.5
LURD023 - - -
Drill hole LURD023 was cored as a diamond tail beneath LURC023, a
shallow RC percussion hole that drill tested a copper-in-soil
geochemical anomaly and intersected transported malachite fragments in
the top two metres. The diamond core intersected unmineralized units of
possible Red RAT formation.
Drill hole LUDH029 was cored as a scout hole testing stratigraphic
continuity between the lower Roan mines Series R2 units in the open
pit, and the stratigraphically higher Mwashya (R4) units on the ridge
near the southern licence boundary. The hole intersected thin intervals
of altered units of dolomite, dolomitic siltstone and algal material in
the upper part of the hole, before drilling through a large faulted
zone and terminating in unmineralized units of possible Red RAT
formation. The dolomitic and algal units in the top of the hole,
interpreted as being Dipeta (R3) formation, were weakly mineralized
returning 12 metres at 0.1 per cent copper and 0.1 per cent cobalt from 19.5 metres. The
hole was collared near the northern edge of the large copper-in-soil
geochemical anomaly.
Nigel Ferguson, president and chief executive officer of the company, stated:
"We are very pleased to be able to report further significant
mineralized intervals within the Luisha South project, such as 59.5
metres at 1.7 per cent Cu and 0.8 per cent Co within LUDH033. The higher-grade
material running around 3 per cent Cu is giving further encouragement for a
program of potentially deeper drilling aimed at testing mineralized
zones and increasing the resources below the minus 120m RL level. It is
expected that, over all, these new mineralized intervals will
significantly impact on our current resources. Our independent
geologist has already been engaged and will be completing a rerun of
the resource model including all new data. This should be reported to
the market within May.
"AFR has achieved great success in the field, and, with a potentially
larger resource defined, we are hopeful that this will support
commercial operations to upgrade the copper and cobalt mineralization
through a DMS concentration plant. The company will be completing
metallurgical test work on representative samples from the project to
allow further processing studies to be undertaken with the aim of
moving into concentrate production by third quarter 2011."
With the recent results from the Luisha South project, the company has
given notice to KMH SPRL that it has withdrawn from the Kalande project
to enable company resources to concentrate on further advancing the
Luisha South project into production.
Mr. Ferguson, AusIMM, president and CEO of the company and a qualified
person under National Instrument 43-101, has verified data disclosed in
this release.
Drill hole sampling and assaying procedure
The company undertakes drilling and sampling to strict guidelines. The
core was collected from the drill rig at the end of each shift,
processed for RQD geotechnical logging and digitally photographed. The
drill core was predominantly NQ in size, with a small percentage of HQ
core in the upper 20 m of holes cored from surface in clay soils. Core
was fitted back together whenever possible, and geologically logged
on site by the supervising project geologist. The project geologist
ensured a representative cutting line was marked along the length of
the core and samples highlighted at appropriate intervals. Once the
sample intervals and cut lines had been clearly marked out, the start
and end of each sample interval was cut orthogonal to the long axis of
the core to clearly define the end of each sample interval. The core
was then cut in half lengthwise along the representative cut line. A
stand-mounted, diamond-impregnated electric saw blade purchased from
Johannesburg, South Africa, was used for all core cutting purposes. The
left half of the core was returned to the metal core trays and retained
for future reference; the right half was placed into appropriately
marked and labelled plastic sample bags. Quality control protocols
enforced by the company require the collection and insertion of
certified reference materials at the rate of one CRM blank,
one field blank (sand), one CRM copper standard and one field
duplicate sample within each sample stream of 20 samples.
Samples were delivered under security by company vehicle to SGS Minerals
Laboratory in Kalulushi, Zambia, for sample preparation and analysis.
The laboratory maintains quality assurance protocols in line with ISO
17025, and maintains quality accreditation for commercial laboratories
in line with ISO 9002. The laboratory also participates in
international round robin programs organized by LQSI of the USA.
The sample preparation scheme was PRP90; drying for four hours at 105
C; crushing to two millimetres with 90 per cent passing two mm; and pulverizing
of a 1,000-gram subsplit of the two-millimetre chips to 85 per cent passing 75 microns.
Digest was scheme DIG42S; 0.4 gram of pulverized material digested in
a four-acid mixture on a hot plate at 200 C for 45 minutes,
with subsequent dilution back to 100 millilitres before AAS analysis by method
AAS42S. Results for copper and cobalt were reported in percentages.
Lower detection limits were 0.01 per cent for both elements.
We seek Safe Harbor.
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