Mr. Nigel Ferguson reports
AFRICAN METALS ASSAY RESULTS FROM STOCKPILE DRILLING HIGHLIGHT ZONES OF SIGNIFICANT COPPER AND COBALT MINERALIZATION, LUISHA SOUTH PROJECT, KATANGA PROVINCE, DEMOCRATIC REPUBLIC OF CONGO
African Metals Corp. has received final assay results from the 42 reverse circulation (RC) drill holes completed on the stockpile at its Luisha South project in the Katanga province of Democratic Republic of Congo.
Highlights
A 42-hole, reverse circulation (RC) drilling program conducted on top of the historic Luisha South open pit stockpile produced 416 samples from 383 metres of drilling.
Analytical results of the RC samples indicate that the stockpile hosts zones of elevated grades of copper (greater than 1 per cent) and cobalt (greater than 1 per cent) mineralization. Similar assay results were produced by excavator sampling conducted by Strathcona in 2007 and reported in 2008.
Significant length-weighted average (LWA) drill intercepts include:
- Seven metres at 0.59 per cent copper, 1.15 per cent cobalt from zero metre (SPRC018);
- Eight metres at 0.54 per cent copper, 1.04 per cent cobalt from zero metre (SPRC019);
- Six metres at 0.79 per cent copper, 1.04 per cent cobalt from zero metre (SPRC020);
- Nine metres at 2.63 per cent copper, 0.52 per cent cobalt from zero metre (SPRC021);
- 11 metres at 3.82 per cent copper, 0.94 per cent cobalt from zero metre (SPRC026);
- Eight metres at 2.47 per cent copper, 0.38 per cent cobalt from zero metre (SPRC027);
- Eight metres at 2.53 per cent copper, 0.46 per cent cobalt from zero metre (SPRC028);
- Eight metres at 1.82 per cent copper, 0.16 per cent cobalt from zero metre (SPRC029);
- 10 metres at 2.19 per cent copper, 0.36 per cent cobalt from zero metre (SPRC030);
- Eight metres at 2.21 per cent copper, 0.33 per cent cobalt from zero metre (SPRC033);
- Seven metres at 0.94 per cent copper, 1.06 per cent cobalt from zero metre (SPRC038).
Luisha South project stockpile RC drilling
In October, 2010, Magnum Drilling Sprl. completed a 42-hole, reverse circulation (RC) drilling program on top of the Luisha South stockpile (see the table).
Union Miniere du Haut-Katanga (UMHK), a historic mining company, conducted open pit mining of the Luisha South deposit between 1913 and 1939. The stockpile represents the remnants of the ore that was processed during this period.
The RC program produced 416 samples including quality controls from 383 metres of drilling. The RC program was designed to highlight the potential copper and cobalt grades of the stockpile and their respective spatial distribution.
Samples were collected at one-metre intervals and riffle split to produce approximately one-kilogram samples for analysis. All samples including quality control controls were dispatched to ALS Laboratories in Johannesburg, South Africa, for sample processing and analysis. All samples were analyzed by method ME-ICP61 following sample prep and a four-acid digest. The analytical results of the quality control samples (standards, blanks and field duplicates) were within acceptable limits.
Anomalous length-weighted drill intercepts based on 0.1-per-cent Cu cut-off are summarized in the table.
Total
Hole depth From Width Copper Cobalt
No. (m) (m) (m) % %
SPRC001 11 4 4(i) 1.27 1.09
SPRC002 10 0 9 0.55 0.53
SPRC003 7 0 3(i) 0.18 0.44
SPRC004 8 0 3(i) 0.08 0.18
SPRC005 4 0 3(i) 0.36 0.22
SPRC006 8 0 8 0.27 0.36
SPRC007 10 0 9 0.34 0.43
SPRC008 10 0 8 0.16 0.32
SPRC009 9 0 7 0.21 0.31
SPRC010 10 0 3(i) 0.94 0.41
SPRC011 7 0 7(i) 0.00 0.00
SPRC012 8 0 6 0.53 0.26
SPRC013 10 0 7 0.27 0.45
SPRC014 10 0 7 0.12 0.23
SPRC015 10 0 9 0.15 0.26
SPRC016 10 0 8 0.73 0.29
SPRC017 9 0 7 0.77 0.91
SPRC018 8 0 7 0.59 1.15
SPRC019 10 0 8 0.54 1.04
SPRC020 10 0 6 0.79 1.04
SPRC021 10 0 9 2.63 0.52
SPRC022 9 0 9 1.50 0.19
SPRC023 9 0 4 0.58 0.21
SPRC024 10 0 8(i) 0.62 0.17
SPRC025 10 5 2(i) 1.39 0.14
SPRC026 11 0 11 3.82 0.94
SPRC027 9 0 8 2.47 0.38
SPRC028 10 0 8 2.53 0.46
SPRC029 10 0 9 1.82 0.16
SPRC030 10 0 10 2.19 0.36
SPRC031 10 0 8 0.48 0.69
SPRC032 9 0 5 0.58 0.33
SPRC033 9 0 8 2.21 0.33
SPRC034 11 0 6(i) 0.41 0.56
SPRC035 7 0 6 0.32 0.33
SPRC036 9 0 7 0.59 1.47
SPRC037 10 0 8 0.96 0.67
SPRC038 9 0 8 0.94 1.06
SPRC039 9 0 3 0.19 0.36
SPRC040 4 0 4(i) 0.00 0.00
SPRC041 9 0 3(i) 2.58 0.38
SPRC042 10 0 3(i) 0.39 0.33
Notes:
Luisha South stockpile RC holes; collar information and LWA
intercepts.
((i) equals cavities in stockpile affected sample return and
resultant LWA intercept calculations.)
(Intersections are downhole widths, not true widths;
intersections are based on one-metre riffle samples split at the
rig; reported assays are length-weighted average intercepts;
intercepts are based on 0.1-per-cent copper cut-off, with no top
cut. Reported intercepts include a maximum of one internal waste
sample interval of less than 0.1 per cent copper including NSR
samples. NSR intervals were assigned a zero value for
calculations.)
Cavities were intersected in 12 of the 42 holes, resulting in NSR or no sample return. It is not known whether the source of the cavities is due to the rubbly, poorly sorted nature of the stockpile, or weathering.
The analytical results indicate that the northeastern half of the stockpile hosts the higher copper and cobalt grades, with smaller high-grade pockets occurring in the south. Sulphides were not observed during the logging of the drill chips.
Based on the positive assay results and the observation that the mineralization is of an oxide nature (malachite and heterogenite), AFR has approached metallurgical companies including Mintek in Johannesburg, South Africa, and METS in Perth, Australia, to conduct beneficiation test work aimed at producing a higher-grade concentrate amenable to conventional hydrometallurgical leaching. The company plans to commence test work in February, with beneficiation results expected during mid to late March.
AFR also intends to estimate a copper and cobalt resource of the stockpile based on the results of the RC drilling. The resource is expected to be issued by the end of March.
Nigel Ferguson, AusIMM, president and chief executive officer of the company and a qualified person under National Instrument 43-101, has verified data disclosed in this release.
We seek Safe Harbor.
© 2024 Canjex Publishing Ltd. All rights reserved.