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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
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Cemented backfill
Processing
  • Gravity separation
  • ACACIA reactor
  • Carbon re-activation kiln
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life10 years (as of Jan 1, 2020)
The North Mara mine is currently an underground operation (Gokona).

The North Mara transitioned to underground mining during 2020 and significant improvements made to improve costs and operational effectiveness.
Latest NewsBarrick Gold Corporation: Twiga a Triumph of Partnership     October 23, 2020


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.

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 is currently an underground operation (Gokona).

The North Mara transitioned to underground mining during 2020 and significant improvements made to improve costs and operational effectiveness.

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”).


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 1
SAG mill 1
Ball mill 2

Summary:

The ore is hauled in 80 tonne dump trucks up to the Run of Mine (ROM) pad at Nyabirama. The ore is drawn out of the ROM bin and fed onto a vibrating grizzly screen by means of an apron feeder. The undersize material passes through the grizzly onto a conveyor belt while the oversize material passes through a jaw crusher which discharges onto the same conveyor belt. The ore is fed onto a banana screen via a two tier conveyor system. The undersize from the banana screen passes onto a conveyor belt which feeds the SAG (Semi-Autogenous Grinding) mill feed stockpile while the oversize material is fed into a secondary cone crusher. The crushed ore from the secondary stockpile is tipped onto the SAG feed stockpile.

The ore is drawn from underneath the SAG mill feed stockpile onto the SAG mill feed conveyor belt by means of three vibrating feeders. It is fed into the SAG mill for primary grinding. The SAG mill discharge is pumped to a cluster of twelve cyclones for classification. The cyclone overflow is fed to two trash screens whilst the underflow reports to a scalping screen prior to gravity concentration. Screen overflow is recombined with gravity circuit tails and reports to 2 ball mills in closed circuit with the classification cyclones.


Processing

  • Gravity separation
  • ACACIA reactor
  • Carbon re-activation kiln
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Both oxide and sulphide reserves are mined and processed by conventional carbon-in-leach (CIL) technology.

The concentrate from the Knelson Concentrators is fed to the Acacia reactor in the gold room for gold recovery by intensive cyanidation. Acacia tailings are returned to the ball mill circuit and pregnant solution is pumped to electrowinning cells.

The trash screen overflow falls into a bunker whilst the underflow is fed to two thickeners. Thickened slurry is pumped to the CIL circuit and water recovered from the thickeners is pumped back to the mill circuit as process water. The CIL circuit consists of three pre-leach tanks and nine adsorption tanks. Carbon is transferred counter current to slurry flow by means of air lifts and is pumped from Tank 4 over the loaded carbon screen before being transferred to the acid wash section.

Residue from the CIL section is pumped to a cyanide detoxification circuit where Weak Acid Dissociable (WAD) cyanide con ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required92.7929288.287.2
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required43.94.53.63.5

Production:

CommodityUnits2021202020192018201720162015
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required336324378287
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required14,263 kt16,935 kt15,953 kt15,996 kt15,408 kt
Ore tonnes mined  ......  Subscription required6,333 kt3,657 kt3,801 kt3,192 kt3,659 kt
Waste  ......  Subscription required7,930 kt9,783 kt
Stripping / waste ratio  ......  Subscription required1.39 4.47
Tonnes processed  ......  Subscription required2,459 kt2,847 kt2,841 kt2,830 kt2,833 kt
Annual processing capacity  ......  Subscription required8,000 t2.8 Mt2.8 Mt
Daily processing capacity  ......  Subscription required8,000 t8,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 0.12 Mt Gold 8.43 g/t 0.033 M oz
Proven In-Situ (UG) 2.5 Mt Gold 6.94 g/t 0.55 M oz
Proven Total 2.6 Mt Gold 7.01 g/t 0.58 M oz
Probable In-Situ (OP) 21 Mt Gold 1.4 g/t 0.99 M oz
Probable In-Situ (UG) 6.3 Mt Gold 4.25 g/t 0.86 M oz
Probable Total 29 Mt Gold 2.04 g/t 1.8 M oz
Proven & Probable In-Situ (OP) 21 Mt Gold 1.44 g/t 1 M oz
Proven & Probable In-Situ (UG) 8.7 Mt Gold 5.01 g/t 1.4 M oz
Proven & Probable Total 31 Mt Gold 2.46 g/t 2.4 M oz
Measured In-Situ (OP) 25 Mt Gold 2 g/t 1.5 M oz
Measured In-Situ (UG) 1.4 Mt Gold 5.42 g/t 0.24 M oz
Measured Total 26 Mt Gold 2.18 g/t 1.8 M oz
Indicated In-Situ (OP) 33 Mt Gold 1.58 g/t 1.7 M oz
Indicated In-Situ (UG) 11 Mt Gold 3.41 g/t 1.18 M oz
Indicated Total 44 Mt Gold 2.03 g/t 2.9 M oz
Inferred In-Situ (OP) 13 Mt Gold 1.3 g/t 0.57 M oz
Inferred In-Situ (UG) 9.9 Mt Gold 4.4 g/t 1.4 M oz
Inferred Total 24 Mt Gold 2.6 g/t 1.9 M oz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs (sold) Gold USD 410 / oz† 590 / oz†
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 609 / oz 513 / oz
Total cash costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 603 / oz† 509 / oz†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required 836 / oz 777 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 830 / oz† 773 / oz†
All-in sustaining costs (sold) Gold USD 733 / oz† 915 / oz†
All-in costs Gold USD  ......  Subscription required  ......  Subscription required 861 / oz 808 / oz
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required† 804 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Sustaining costs M USD  ......  Subscription required  ......  Subscription required25.8   22.6   28.3   19.7  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required81.6   90.9   113   50.1  
Revenue M USD  ......  Subscription required  ......  Subscription required423.2   408.2   469.3   335.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required
EBIT M USD 139.4   170.6   235.3   67.2  
EBITDA M USD  ......  Subscription required  ......  Subscription required201.1   225.5   302.8   134.6  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 17, 2021
....................... Subscription required ....................... Subscription required Subscription required May 17, 2021
....................... Subscription required ....................... Subscription required Subscription required May 17, 2021
....................... Subscription required ....................... Subscription required Subscription required May 17, 2021
....................... Subscription required ....................... Subscription required Subscription required May 17, 2021
....................... Subscription required ....................... Subscription required Subscription required May 17, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... 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
Subscription required - Subscription is required.

News:

NewsDate
Barrick Gold Corporation: Twiga a Triumph of Partnership October 23, 2020

Aerial view:

Subscription required - Subscription is required.

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