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Tanzania
Bulyanhulu Mine

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 Location:
90 km SW from Mwanza, Tanzania

  Regional Office:
Tan House Tower, Plot Number 34/1 Ursino South, New Bagamoyo Road Post Office Box 1081
Dar Es Salaam
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 TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Longhole stoping
Production Start...
Mine Life18 years (as of Jan 1, 2018)


Owners

Source: p. 181,219
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 will provide management services to the mines.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein


Summary:

The main rock types in the mine area are bimodal mafic and felsic volcanics rocks of the West Kahama segment of the Nyanzian age Kahama Greenstone Belt. The mafic rocks are predominantly flows, overlain by a series of felsic pyroclastics and ash tuffs. Argillites occur within the mafic flows and at the mafic/felsic contact and are the principal host for the mineralization. Mafic dykes/sills, commonly lensoid along their northwest strike, are a significant part of the lithological package southwest of the deposit itself. The Bukoli Granite, which separates the Kahama belt from the Rwamagaza belt to the west, lies approximately 3 km southwest of the mine. Together with regional faults, the Bukoli Granite forms the bounds of a rhomboid-shaped greenstone domain at Bulyanhulu.

The gold mineralization, together with copper sulphides and silver, occurs in quartz veins localized along steeply-dipping structures parallel to the regional northwest strike. Nine of these extensive quartz vein systems have been discovered so far with Reef 1, hosted by a shear zone developed preferentially along the most extensive sedimentary unit, the most significant. The ore is characterized by sub continuous lenses and veins of black quartz concentrated in narrow shear zones. An initial stage of syn-depositional barren clastic pyrite has been identified, overprinted by a polymetallic hydrothermal event associated with gold and copper mineralization. Alteration, dominantly carbonatization ........


Mining Methods

  • Longhole stoping


Summary:

In the second half of 2017 Acacia took the decision to place Bulyanhulu on reduced operations due to the inability to export gold concentrate. Following the transition to reduced operations in Q4 2017 Bulyanhulu is running on tailings.

Underground production successfully restarted at Bulyanhulu in Q4 2020, with the plant recommencing processing of underground ore.

Bulyanhulu mine utilizes a long hole stoping method.

Mineralization is associated with steeply-dipping reefs containing gold, silver and copper in sulphides.


Crushing and Grinding
Source: Subscription required


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:
In Q4 2017, mine was placed under care and maintenance. Bulyanhulu is running on tailings. Underground mining was successfully restarted at Bulyanhulu in Q4 2020.

CommodityProductUnits2022202120202019201820172016
Gold Metal in conc./ doré koz  ......  Subscription required ^  ......  Subscription required175289
Gold Metal in doré koz  ......  Subscription required  ......  Subscription required40
Copper Metal in concentrate k lbs  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required596 kt909 kt
Tonnes processed  ......  Subscription required  ......  Subscription required2,103 kt1,899 kt1,622 kt2,583 kt
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityGradeContained Metal
Probable In-Situ (UG) 12 Mt Gold 7.76 g/t 3 M oz
Probable In-Situ (UG) 12 Mt Copper 0.37 % 98 M lbs
Probable In-Situ (UG) 12 Mt Silver 6.92 g/t 2.7 M oz
Proven & Probable In-Situ (UG) 12 Mt Gold 7.76 g/t 3 M oz
Proven & Probable In-Situ (UG) 12 Mt Copper 0.37 % 98 M lbs
Proven & Probable In-Situ (UG) 12 Mt Silver 6.92 g/t 2.7 M oz
Indicated In-Situ (UG) 20 Mt Gold 8.92 g/t 5.7 M oz
Indicated In-Situ (UG) 20 Mt Copper 0.41 % 179 M lbs
Indicated In-Situ (UG) 20 Mt Silver 7.31 g/t 4.6 M oz
Inferred In-Situ (UG) 29 Mt Gold 8 g/t 7.4 M oz
Inferred In-Situ (UG) 29 Mt Copper 0.4 % 238 M lbs
Inferred In-Situ (UG) 29 Mt Silver 6.3 g/t 5.8 M oz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs (sold) Gold USD 599 / oz†   840 / oz†   722 / oz†  
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (sold) Gold USD 786 / oz†   1,373 / oz†   1,058 / oz†  
All-in costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202120202019
UG mining costs ($/t mined) USD 91.736.8
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 3.2   9   20.2  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 5.1   45.6   95.3  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 53.7   137   360.9  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBIT M USD -31   -900.1   48.2  
EBITDA M USD  ......  Subscription required  ......  Subscription required -7.9   -15.7   130.2  
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Heavy Mobile Equipment as of November 10, 2021:
HME TypeQuantity
Drill ....................... Subscription required
Loader ....................... 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 Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 13, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Quarterly Report 2017
Annual Report 2016
Corporate Presentation 2016
Annual Report 2014
Corporate Presentation 2014
Project Description 2009
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