Overview
Stage | Production |
Mine Type | Open Pit & Underground |
Commodities |
|
Mining Method |
- Truck & Shovel / Loader
- Longhole open stoping
- Cemented backfill
|
Production Start | ...  |
Mine Life | 10 years (as of Jan 1, 2020) |
The North Mara mine consists of an underground operation (Gokona) and Nyabirama open pit. |
Source:
p. 19-20
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 the 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, formalizing the establishment of a joint venture between Barrick and the GoT and resolution of all outstanding disputes between Barrick and the GoT. The Government of Tanzania will receive a free carried shareholding of 16% in each of the former Acacia mines (Bulyanhulu, Buzwagi and North Mara). The GoT’s 16% free-carried interest was made effective on January 1, 2020.
Twiga Minerals Corporation (“Twiga”), the operating company formed to manage the Tanzania mines (Bulyanhulu, Buzwagi and North Mara).
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
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.
Source:

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Source:
Summary:

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Production:
Commodity | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Gold
|
koz
| ...... ^ | ......  | ......  | ......  | 336 | 324 | 378 |
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Total tonnes mined
| ......  | ......  | 14,263 kt | 16,935 kt | 15,953 kt | 15,996 kt |
Ore tonnes mined
| ......  | ......  | 6,333 kt | 3,657 kt | 3,801 kt | 3,192 kt |
Waste
| ......  | ......  | 7,930 kt | 9,783 kt | | |
Stripping / waste ratio
| ......  | ......  | 1.39 | 4.47 | | |
Tonnes processed
| ......  | ......  | 2,459 kt | 2,847 kt | 2,841 kt | 2,830 kt |
Annual processing capacity
| ......  | ......  | 8,000 t | 2.8 Mt | 2.8 Mt | |
Daily processing capacity
| ......  | ......  | | 8,000 t | 8,000 t | |
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Reserves at December 31, 2021:
Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
In-Situ (OP)
|
45 Mt
|
Gold
|
1.73 g/t
|
2.5 M oz
|
Proven & Probable
|
In-Situ (UG)
|
8 Mt
|
Gold
|
3.44 g/t
|
0.89 M oz
|
Proven & Probable
|
Total
|
52 Mt
|
Gold
|
1.99 g/t
|
3.3 M oz
|
Measured
|
In-Situ (OP)
|
15.5 Mt
|
Gold
|
2.54 g/t
|
1.2 M oz
|
Measured
|
In-Situ (UG)
|
0.76 Mt
|
Gold
|
3.56 g/t
|
0.087 M oz
|
Measured
|
Total
|
15.5 Mt
|
Gold
|
2.59 g/t
|
1.3 M oz
|
Indicated
|
In-Situ (OP)
|
48 Mt
|
Gold
|
1.41 g/t
|
2.1 M oz
|
Indicated
|
In-Situ (UG)
|
21 Mt
|
Gold
|
2.04 g/t
|
1.4 M oz
|
Indicated
|
Total
|
69 Mt
|
Gold
|
1.61 g/t
|
3.6 M oz
|
Inferred
|
In-Situ (OP)
|
6 Mt
|
Gold
|
1.1 g/t
|
0.21 M oz
|
Inferred
|
In-Situ (UG)
|
9.3 Mt
|
Gold
|
1.8 g/t
|
0.55 M oz
|
Inferred
|
Total
|
15.5 Mt
|
Gold
|
1.6 g/t
|
0.77 M oz
|
Corporate Filings & Presentations:
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