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In late June 2009, Avocet
completed the recommended, share for share,
acquisition of Wega Mining ASA (‘Wega’).
The main asset of Wega is the 90% owned
Inata project in Northern Burkina Faso.
Following the first gold pour in December 2009, the project is currently ramping-up production towards a rate of 120,000 ounces per annum by mid-2010. Regular updates on gold production at Inata will be provided by the Company as the mine progresses through to full production. As announced on the 29 January, Inata produced 3,200 ounces during January 2010, and is currently progressing ahead of schedule.
The current life of mine (‘LOM’) plan has determined an operation that will produce at least 120,000 ounces of gold annually over an initial 7 year mine life. Current NI 43-101-compliant mineral resources at Inata are 1,694,000 ounces of gold and the current ore reserves at Inata stand at 944,000 ounces. It is anticipated that additional gold resources from nine exploration licences surrounding the 26 km2 Inata mining permit will be defined in due course for incorporation into the LOM plan. Now that the project is in production, Avocet has recommenced exploration activities on the prospective tenements that surround the Inata mill.
The gold mineralisation
at Inata can be traced over a continuous
4 km strike length and occurs within silicified
volcaniclastic rocks, porphyries and vein
quartz that occur within a large shear zone.
The 944,000 ounces of proven and probable
reserves will be mined from three principal
pit areas: Inata North, Central and South.
Three smaller pits will be developed during
the life of the project.
Under previous ownership, geological modeling and resource estimation was completed by Ravensgate Consultants of Perth, Australia. George, Orr & Associates also of Perth, Australia provided crucial geotechnical information to enable the pits to be designed which were completed by Orelogy of Perth, Australia. Orelogy also completed all reserve estimation and mine costings. Tailings facility management, water dam and other mine infrastructure was carried out by AMEC and Wardell Armstrong International and metallurgical testwork was completed by AMMTEC of Perth, Australia.
| |
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| Mineral
Reserves |
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| -
Proven |
 |
| -
Probable |
 |
| -
Reserves subtotal |
|
 |
| Gross |
 |
| Tonnes__ |
 |
| |
 |
| 4,472,000__ |
 |
| 10,952,000__ |
 |
| 15,424,000__ |
|
 |
| Grade
(g/t)–– |
 |
| |
 |
| 2.30__ |
 |
| 1.70__ |
 |
| 1.90__ |
|
 |
Contained––
Ounces–– |
 |
| |
 |
| 329,000__ |
 |
| 615,000__ |
 |
| 944,000__ |
|
|
 |
| Net
attributable (90%) |
 |
| Tonnes__ |
 |
| |
 |
| 4,020,800__ |
 |
| 9,860,800__ |
 |
| 13,881,600__ |
|
 |
| Grade
(g/t)–– |
 |
| |
 |
| 2.30__ |
 |
| 1.70__ |
 |
| 1.90__ |
|
 |
Contained––
Ounces–– |
 |
| |
 |
| 296,200__ |
 |
| 553,000__ |
 |
| 849,200__ |
|
|
 |
| Mineral
Resources |
 |
| Measured |
 |
|
Indicated |
 |
| Measured
+ Indicated |
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| Inferred |
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| Resources
subtotal |
|
 |
| |
 |
| 5,217,100__ |
 |
| 19,843,260__ |
 |
| 25,060,360__ |
 |
| 7,095,900__ |
 |
| 31,156,260__ |
|
 |
| |
 |
| 2.30__ |
 |
| 1.60__ |
 |
| 1.75__ |
 |
| 1.30__ |
 |
| 1.65__ |
|
 |
| |
 |
| 378,480__ |
 |
| 1,018,450__ |
 |
| 1,396,930__ |
 |
| 297,910__ |
 |
| 1,694,840__ |
|
|
 |
| |
 |
| 4,695,000__ |
 |
| 17,858,900__ |
 |
| 22,554,300__ |
 |
| 6,386,300__ |
 |
| 28,940,600__ |
|
 |
| |
 |
| 2.30__ |
 |
| 1.60__ |
 |
| 1.75__ |
 |
| 1.30__ |
 |
| 1.65__ |
|
 |
| |
 |
| 340,600__ |
 |
| 916,600__ |
 |
| 1,257,200__ |
 |
| 268,100__ |
 |
| 1,525,300__ |
|
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Reserves were calculated
at a 0.8 gpt Au cut-off and a stock pile
is developed for all low grade ore (0.5
– 0.8 gpt Au)
that will be processed towards the end of
the mine’s life.
Conventional drilling,
blasting, loading and hauling will be deployed
during the mining of each pit through a
sequential life-of-mine plan that has been
determined from physical properties of the
orebodies, the equipment in use and the
economics that govern the profitability
of the mining. The majority of the ore is
soft oxide that will not require blasting.
Less than 5% of the existing reserves are contained
in fresh rock.
A 12.6 MW power station from Connell Mining Products Ltd and the Komatsu owner-operator mining fleet comprising 6 Komatsu 785s (100-tonne haulage trucks), 1 Komatsu PC2000 excavator (200-tonne shovel), 1 Komatsu PC1250 (120 tonne excavator) and 1 Tamrock D25 blast-hole drill are on site. The mining fleet and processing plant are both operational 24 hours a day, 7 days a week.
The Inata project will
employ around 300 staff when in full production,
most of which will be recruited from within
Burkina Faso.
The plant will have a
milling capacity of 2.25 Mtpa and has a
SAG mill
and two ball mills in the circuit. Initial
ore production will bypass the SAG mill.
The results from metallurgical testwork
of the ore indicated that conventional CIL
with a gravity recovery circuit will achieve
recoveries of around 90% Au over the life
of the mine. Leach kinetics demonstrated
that the ore was relatively insensitive
to grind size of the ore and good recoveries
were achieved at a grind of 80% passing
106 µm. A conservative approach was
employed in the process design and a grind
of 80% passing 75 µm was selected.
Water for the project is supplied by a 100 million cubic meter water reservoir - the Gomde Barrage. The current capacity held in the dam equates to substantially more water than required for annual consumption for the project and will also represent a stable supply of water for the local communities, a major benefit which has built strong social support for the project. Additional subterranean water sources have been discovered close to Inata that will be used for potable consumption and excess plant water.
Macquarie Bank was mandated as the lead financial institution for the senior debt facility of USD 65m. As part of the project finance facility, the Company is required to forward gold sales of 400,000 ounces at an average price of US$970/oz. Sales of gold into the hedge position are not due to commence until September 2010, and hence all gold production prior to that date will be at market prices.
Avocet, Wega and previous owners of the
Inata project, have worked closely with
the Burkina Faso Government in many areas
of the project to make sure that the project
is sustainable not just as a viable gold
project, but as a sustainable business for
the people and communities within the local
area. Sustainable social initiatives such
as medical assistance and schooling will
be a clear mandate to improve the lives
of people in the areas in which the Company operates.
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