West African Resources Limited Outstanding Column Test Recoveries, up to 90% at Mankarga 5
October 15 2014 - 7:36AM
Business Wire
West African Resources Limited (ASX:WAF) (TSX-V:WAF) is pleased
to report metallurgical test work results from the Mankarga 5
Deposit located on the Tanlouka Permit, part of its Boulsa Project,
in Burkina Faso.
Managing Director Richard Hyde commented on the metallurgical
test work:
"The column test work recoveries of up to 90% supports the
Company's heap leach starter project development approach for the
Mankarga 5 Project.
"All the columns responded well to the test work, however the
leach rate achieved for strongly oxidised ore exceeded
expectations, with 75% gold recovered within the first week.
"Importantly, this ore type represents the bulk of the material
processed in the early stages of the project, and the accelerated
recoveries will significantly enhance project cash flow and reduce
working capital requirements."
Highlights
- Gold recoveries of up to 90% and averaging 86% in column test
work.
- Gold recoveries from column test work confirm heap leach
suitability of oxide ore at the Mankarga 5 deposit, Boulsa Gold
Project, Burkina Faso.
- Rapid leach kinetics with strongly oxidised ore gold
recoveries of 75% after 7 days.
- Gold recoveries for all ore types more than 50% after 7
days.
- Low to moderate cement addition of 5kg to 10kg per tonne.
- Low cyanide consumption of 0.2 - 0.4 kg/t NaCN.
- High percolation rates with low slumping.
- Very low Abrasion and Ball Mill Work Indices indicate that the
wear rates and power consumption will be low to very low by
industry standards.
Three column tests have been completed on oxide ore from the
Mankarga 5 deposit. Test work was completed at ALS Global in Perth
on oxide composites from four metallurgical drill core holes which
were sited at various locations in the Mankarga 5 deposit. One
column contained strongly oxidized ore (SOX) at 100% passing 12.5
mm crush at a cement dose of 10 kg/t. Two columns contained
moderately oxidized ore type (MOX) at 100% passing 12.5 and 6.25 mm
respectively at 5 kg/t cement addition. All columns behaved well,
showed rapid leach kinetics, high percolation rates and low
slumpage. Based on data obtained from the 14 coarse feed
intermittent bottle roll, three column tests and industry
experience cyanide (NaCN) consumption is expected to be in the
order of 0.2 - 0.4 kg/t. Details regarding the column tests are
summarized in Table 1 (link below).
A series of percolation and agglomeration tests were also
carried out on the SOX and MOX samples in preparation for column
leach testing. Table 2 in link below provides a summary of the
results.
Based on this test work SOX sample requires more than 5kg/t of
cement for adequate agglomeration whilst the MOX sample presented
good characteristics at 5 kg/t. The 10 kg/t cement addition to the
SOX material provided very good agglomerates and zero slump
suggesting 10 kg/t is in excess of what would be required. All
samples reported very high percolation rates after appropriate
cement dosage.
Abrasion indices (Ai) and Ball Mill Work Indices (BWI) were
determined for the MOX and fresh (FRS) samples. The MOX values can
be expected to be higher than the SOX material whilst the FRS
results higher than the other three ore types as the FRS
composition has not been compromised by oxidation. These results
are summarised in Table 3 in link below.
Both samples provided very low Abrasion and Ball Mill Work
Indices. This suggests that the all ore types will be able to be
processed with conventional heap leach processing using the 1.6Mtpa
heap leach plant as part purchased by the Company in February this
year. Test work shows that equipment wear rates and power
consumption associated with processing will be low to very low by
industry standards.
In July, the Company delivered positive results from a Scoping
Study which demonstrated a low capital cost, high margin, heap
leach starter project (ASX,TSXV: 29/7/14).
The Company is focussed on near-term production with its
immediate attention on the Mankarga 5 deposit and existing nearby
gold prospects. The Company aims to be a +50,000oz per annum gold
producer by the end of 2015 via a low-cost heap leach starter
project.
To view tables and figures, please visit:
http://media.abnnewswire.net/media/en/docs/ASX-WAF-694685.pdf
About West African Resources Limited
West African Resources Limited (ASX:WAF) (TSX-V:WAF) is a
gold-copper exploration company dedicated to creating shareholder
value through the acquisition, exploration and development of
resource projects in Burkina Faso, West Africa.
West African has a landholding of 6,370sq km and 200km of strike
length of early Proterozoic Birimian greenstone belts, which are
highly prospective for gold mineralisation.
Contact:
West African Resources LimitedNathan Ryan, Investor RelationsT:
+61-420-582-887E: info@westafricanresources.comWWW:
www.westafricanresources.com
West African Resources LimitedNathan Ryan,
+61-420-582-887Investor Relationsinfo@westafricanresources.com
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