Overview
Status | Closing / Closed |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Processing |
- Heap leach
- Carbon in solution (CIS)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
The processing of tailings continued in 2017 as part of closure activities, including rinsing and rehabilitation of the heap leach pads and will continue until the end of 2021, with the completion of mine closure expected at the end of 2022. |
Source:
Yatela is 80% owned by the Sadiola Exploration Company Limited, a joint venture between AngloGold Ashanti and IAMGOLD, giving each a 40% stake. The balance of 20% is owned by the Government of Mali.
Summary:
The Yatela mine comprises the Yatela and Alamoutala deposits located in northwest Mali within the Keniéba-Kedougou Inlier, a major Paleoproterozoic- Birimian inlier along the northeast margin of the Kenema-Man shield. The Yatela deposit is located in the north of the inlier and is hosted in sedimentary rocks of the Kofi Formation, which have been intruded by numerous felsic to intermediate intrusives. The sedimentary rocks consist of fine-grained greywackes, pelites and impure limestones with minor tuffs and acid volcanics. The primary gold mineralisation is hosted along a sheared contact between predominantly dolomitic carbonate rocks of the Kofi Formation to the west and a dioritic intrusion to the east. The secondary mineralisation was concentrated to economic grades through dissolution of the carbonate and subsequent concentration of the gold by eluvial processes and supergene enrichment.
Karst development at Yatela has formed deep pot holes, collectively named the Yatela Basin, which were gradually filled by sandstones and conglomerates during peneplanation of the Proterozoic rocks. Chaotic collapse during karstification, coupled with the infill sediments resulted in the deposit being hosted in a melange-type of rocks made up of sedimentary rocks and dissolution residues. Gold is disseminated in the unconsolidated ferruginous, clastic layer with sandy-clayey matrix that lines the bottom and walls of a deep trough with steep margins. The karst margin dips steeply on the west wall and more gently to the west on the east wall, following a keel-like geometry with tight closure on the folded diorite towards the south. The supergene enrichment of low-grade primary gold mineralisation associated with the karstification is the most important geological feature to the economics of the Yatela deposit.
Summary:
Yatela is a mature open pit operation which has been operated by AngloGold Ashanti since 2000 and is now operating in closure mode with mining activities from the pits completed in September 2013.
Processing
- Heap leach
- Carbon in solution (CIS)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Source:
Summary:
Ore is processed through a three million tonnes per annum heap leach plant that was commissioned in 2000. The pregnant liquor pond for gold recovery uses the carbon-in-solution (CIS) process, with loaded carbon being sent to Sadiola for elution, regeneration, electro-winning and smelting.
Recoveries & Grades:
Commodity | Parameter | 2014 | 2013 |
Gold
|
Head Grade, g/t
| 0.59 | 0.93 |
Production:
Commodity | Units | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 |
Gold
|
koz
| ......  | 7.5 | 12 | 18 | 25 | 67 |
All production numbers are expressed as payable metal.
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Operational Metrics:
Metrics | 2014 | 2013 |
Tonnes processed
| 2.3 Mt | 2.5 Mt |
Reserves at December 31, 2013:
Category | Tonnage | Commodity | Grade | Contained Metal |
Total Resource
|
0.35 Mt
|
Gold
|
0.54 g/t
|
0.01 M oz
|
Commodity Production Costs:
| Commodity | Units | 2015 | 2014 | 2013 |
Total cash costs
|
Gold
|
USD
|
974 / oz
|
1,438 / oz
|
1,530 / oz
|
All-in sustaining costs (sold)
|
Gold
|
USD
|
1,590 / oz
|
1,795 / oz
|
1,653 / oz
|
Financials:
| Units | 2013 |
Capital expenditures
|
M USD
|
7
|
Corporate Filings & Presentations:
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Aerial view:
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