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Tanzania
North Mara Mine

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 Location:
23 km SE from Tarime, Tanzania
  Address:
PO Box 422
Tarime
Tanzania
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Cemented backfill
Production Start...
Mine Life10 years (as of Jan 1, 2020)
The North Mara mine consists of an underground operation (Gokona) and Nyabirama open pit.

Owners

Source: p. 19-20
CompanyInterestOwnership
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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Deposit Type

  • Vein / narrow vein

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.

Crushing and Grinding
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- subscription is required.

Processing

Source: Subscription required

Summary:

- subscription is required.

Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required336324378
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined  ......  Subscription required  ......  Subscription required14,263 kt16,935 kt15,953 kt15,996 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required6,333 kt3,657 kt3,801 kt3,192 kt
Waste  ......  Subscription required  ......  Subscription required7,930 kt9,783 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required1.39 4.47
Tonnes processed  ......  Subscription required  ......  Subscription required2,459 kt2,847 kt2,841 kt2,830 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required8,000 t2.8 Mt2.8 Mt
Daily processing capacity  ......  Subscription required  ......  Subscription required8,000 t8,000 t
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Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityGradeContained 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

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs (sold) Gold USD 410 / oz†  
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 609 / oz   513 / oz  
Total cash costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 603 / oz†   509 / oz†  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 836 / oz   777 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 830 / oz†   773 / oz†  
All-in sustaining costs (sold) Gold USD 733 / oz†  
All-in costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 861 / oz   808 / oz  
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 804 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20212020
OP mining costs ($/t mined) USD 3.7316.1
UG mining costs ($/t mined) USD  ......  Subscription required  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required
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Financials:

Units202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 25.8   22.6   28.3  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 81.6   90.9   113  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 423.2   408.2   469.3  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBIT M USD 139.4   170.6   235.3  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 201.1   225.5   302.8  
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Heavy Mobile Equipment as of January 30, 2023:
HME TypeModelQuantity
Drill ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required
Truck (underground) ....................... Subscription required
Truck (underground) ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Feb 1, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
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Corporate Filings & Presentations:

DocumentYear
Other 2023
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Annual Report 2016
Other 2016
Annual Report 2014
Other 2014
Project Description 2009
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