Overview
| Stage | Production |
| Mine Type | Open Pit & Underground |
| Commodities |
|
| Mining Method |
- Truck & Shovel / Loader
- Longhole open stoping
- Cemented backfill
- Paste backfill
|
| Production Start | ...  |
| Mine Life | 2030 |
The North Mara mine is a combined open pit and underground operation from two deposits, Gokona (underground) and Nyabirama (open pit). |
Source:
p. 142-143
| Company | Interest | Ownership |
|
Government of Tanzania
|
16 %
|
Indirect
|
|
Barrick Gold Corp.
|
84 %
|
Indirect
|
|
Twiga Minerals Corporation Ltd.
(operator)
|
100 %
|
Direct
|
On September 17, 2019, Barrick acquired all of Acacia Mining plc. Acacia became a wholly-owned subsidiary of Barrick called Barrick TZ Limited.
On January 24, 2020, Barrick announced that the Company had ratified the creation of Twiga Minerals Corporation (“Twiga”), the operating company formed to manage the Tanzania mines. Effective January 1, 2020, the Government of Tanzania (GoT) received a free carried shareholding of 16% in each of Barrick’s Tanzanian mines (Bulyanhulu, Buzwagi and North Mara), a 16% free carried interest in the shareholder loans owed by the operating companies Twiga is 16% owned by the GoT and provides management services to the mines.
Contractors
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Summary:
The North Mara Mine is situated within the Mara Greenstone Belt. The underlying geology comprises felsic and mafic volcanics intercalated with sediments which are intruded by various granitoid and gabbroic plutonic rocks. Tertiary volcanic lava flows partially cover the underlying Archaean geology and the ore bodies are structurally controlled, shear-hosted lode gold deposits. There are several types of gold mineralisation including shear-zone-related quartz vein and disseminated gold.
Mining Methods
- Truck & Shovel / Loader
- Longhole open stoping
- Cemented backfill
- Paste backfill
Summary:
The North Mara mine consists of an underground operation (Gokona) and Nyabirama open pit.
At Gokona, Acacia utilizes an existing exploration decline for initial access to the planned underground mine. Two major declines are included in the mine plan.
The mining method utilised in the operation is Long Hole Open Stoping (“LHOS”) with Cemented Aggregate Fill (“CAF”).
In the second quarter of 2022, North Mara has seen the successful ramp-up at the Nyabirama open pit.
In 2022, a successful transition of open cast mining from contractor to owner miner has been completed. North Mara’s transition to owner-mining is successfully ramping up its ongoing open pit expansion. The restart of mining at the Gena pit is on track.
In 2022, the paste backfill plant started which will increase flexibility and productivity at Gokona and reduce paste on the surface.
Source:
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Source:
Summary:
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Production:
| Commodity | Units | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Gold
|
koz
| ...... ^ | ...... | ...... | ...... | ...... | 336 | 324 |
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Daily processing capacity
| ...... | | | | 8,000 t | 8,000 t |
|
Ore tonnes mined
| ...... | ...... | 3,049 kt | 6,333 kt | 3,657 kt | 3,801 kt |
|
Waste OP
| ...... | ...... | 1,425 kt | 7,930 kt | 9,783 kt | |
|
Total tonnes mined
| ...... | ...... | 4,474 kt | 14,263 kt | 16,935 kt | 15,953 kt |
|
Tonnes processed
| ...... | ...... | 3,031 kt | 2,459 kt | 2,847 kt | 2,841 kt |
|
Annual processing capacity
| ...... | ...... | | | 2.8 Mt | 2.8 Mt |
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Reserves at December 31, 2022:
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Proven & Probable
|
In-Situ (OP)
|
34.5 Mt
|
Gold
|
2.06 g/t
|
2.38 M oz
|
|
Proven & Probable
|
In-Situ (UG)
|
11.3 Mt
|
Gold
|
3.43 g/t
|
1.19 M oz
|
|
Proven & Probable
|
Total
|
46.4 Mt
|
Gold
|
2.4 g/t
|
3.6 M oz
|
|
Measured
|
In-Situ (OP)
|
21.4 Mt
|
Gold
|
2.25 g/t
|
1.55 M oz
|
|
Measured
|
In-Situ (UG)
|
0.9 Mt
|
Gold
|
2.28 g/t
|
0.07 M oz
|
|
Measured
|
Total
|
21.4 Mt
|
Gold
|
2.25 g/t
|
1.55 M oz
|
|
Indicated
|
In-Situ (OP)
|
27.3 Mt
|
Gold
|
1.79 g/t
|
1.5 M oz
|
|
Indicated
|
In-Situ (UG)
|
33.3 Mt
|
Gold
|
2.21 g/t
|
2.4 M oz
|
|
Indicated
|
Total
|
59.5 Mt
|
Gold
|
2.02 g/t
|
3.9 M oz
|
|
Inferred
|
In-Situ (OP)
|
4.8 Mt
|
Gold
|
1.4 g/t
|
0.22 M oz
|
|
Inferred
|
In-Situ (UG)
|
17.8 Mt
|
Gold
|
1.6 g/t
|
0.89 M oz
|
|
Inferred
|
Total
|
22.6 Mt
|
Gold
|
1.6 g/t
|
1.11 M oz
|
Corporate Filings & Presentations:
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