Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Processing |
- Counter current decantation (CCD)
- Agitated tank leaching
- Carbon in leach (CIL)
- Elution
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
| Mine Life | 12 years (as of Jan 1, 2015) |
Deposit Type
- Vein / narrow vein
- Orogenic
Summary:
The Ahafo mine is composed of three orogenic gold deposits that have oxide and primary mineralization. The gold is hosted in brittle shear zones cutting granitic intrusives that have kilometer-scale vertical and lateral extent. Gold occurs primarily in pyrite and secondarily as native gold in quartz veins.
Summary:
The mining method at the Ahafo mine involves removal of ore and waste rock from an open pit mine. Ahafo has three open pits (Subika, Amoma and Awonsu), with current mining from the Amoma and Subika pits. Subika is in the third stage of a four stage pit, whereas Amoma is in the final stage of a two-stage pit. Ahafo’s available mining fleet consists of open pit loaders and 38 dump trucks, each with a 144 tonne payload.
Processing Technologies
- Counter current decantation (CCD)
- Agitated tank leaching
- Carbon in leach (CIL)
- Elution
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Summary:
The processing plant consists of a crushing plant, a grinding circuit, carbon in leach tanks, elution circuit, counter current decantation circuit and a tailings disposal facility. Currently with the depletion of oxide ore, the plant throughput has decreased to 6.5 million tonnes per year.
Production:
| Commodity | Units | 2016 | 2015 | 2014 | 2013 |
|
Gold
|
koz
| ......  | 332 | 442 | 570 |
All production numbers are expressed as metal in doré.
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Operational Metrics:
| Metrics | 2016 | 2015 |
|
Plant annual capacity
| ...... | 6.5 Mt of ore |
|
Daily processing rate
| ...... | |
- Subscription is required.
Reserves at December 31, 2016:
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
Stockpiles
|
38,100 kt
|
Gold
|
0.97 g/t
|
1,190 koz
|
|
Proven
|
In-Situ (OP)
|
12,600 kt
|
Gold
|
2.25 g/t
|
920 koz
|
|
Probable
|
In-Situ (OP)
|
45,900 kt
|
Gold
|
1.75 g/t
|
2,580 koz
|
|
Probable
|
In-Situ (UG)
|
10,600 kt
|
Gold
|
4.5 g/t
|
1,530 koz
|
|
Proven & Probable
|
Stockpiles
|
38,100 kt
|
Gold
|
0.97 g/t
|
1,190 koz
|
|
Proven & Probable
|
In-Situ (OP)
|
58,500 kt
|
Gold
|
1.86 g/t
|
3,500 koz
|
|
Proven & Probable
|
In-Situ (UG)
|
10,600 kt
|
Gold
|
4.5 g/t
|
1,530 koz
|
|
Measured
|
In-Situ (OP)
|
1,200 kt
|
Gold
|
0.59 g/t
|
20 koz
|
|
Indicated
|
In-Situ (OP)
|
29,200 kt
|
Gold
|
1.22 g/t
|
1,140 koz
|
|
Indicated
|
In-Situ (UG)
|
7,800 kt
|
Gold
|
4.26 g/t
|
1,070 koz
|
|
Measured & Indicated
|
In-Situ (OP)
|
30,400 kt
|
Gold
|
1.19 g/t
|
1,160 koz
|
|
Measured & Indicated
|
In-Situ (UG)
|
7,800 kt
|
Gold
|
4.26 g/t
|
1,070 koz
|
|
Inferred
|
In-Situ (OP)
|
15,300 kt
|
Gold
|
1.6 g/t
|
790 koz
|
|
Inferred
|
In-Situ (UG)
|
12,600 kt
|
Gold
|
3.9 g/t
|
1,580 koz
|
Commodity Production Costs:
| | Commodity | Units | 2016 | 2015 | 2014 | 2013 |
|
Total cash costs (sold)
|
Gold
|
USD
|
...... 
|
610 / oz
|
552 / oz
|
542 / oz
|
|
All-in sustaining costs (sold)
|
Gold
|
USD
|
......
|
892 / oz
|
849 / oz
|
855 / oz
|
- 'Analyst' subscription is required.
Financials:
| | Units | 2016 | 2015 | 2014 | 2013 |
|
Capital expenditures
|
M USD
| ......  |
92
|
104
|
170
|
|
Pre-tax Income
|
M USD
| ...... |
74
|
221
|
344
|
- 'Supplier or 'Analyst' subscription is required.
Heavy Mobile Equipment as of December 31, 2016:
| HME Type | Size | Quantity |
|
Shovel
|
|
3
|
|
Truck (haul)
|
141 t
|
38
|
Corporate Filings & Presentations: