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Guinea
Siguiri Mine

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 Location:
23 km NW from Siguiri, Guinea

  Regional Office:
Cite Ex, Chermin de Fer, 2 Etage, Immeuble Boke
Conakry
Guinea
1006
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Calcining
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)


Owners & OPERATOR

Source: p. 108
CompanyInterestOwnership
AngloGold Ashanti Ltd. 85 % Indirect
Societe Ashanti Goldfields de Guinee SA (operator) 100 % Direct
Siguiri in Guinea is 85% owned by AngloGold Ashanti and 15% by the government of Guinea.

Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

The Siguiri orebodies are early Proterozoic orogenic quartz-vein hosted deposits located in the Siguiri Basin of West Africa. Generally poorly exposed, the basin sediments have been subject to greenschist facies metamorphism and consist of a well-bedded turbiditic sedimentary sequence, with some brecciated and possibly volcanic members. Mineralisation also occurs as secondary gold in alluvial and colluvial gravels in laterite cover.

Three main sedimentary packages are recognised in the Siguiri district, the Balato, Fatoya and Kintinian formations. The Balato Formation is dominated by centimeter scale alternations of shale-siltstone and greywacke. The overlying Fatoya Formation consists of meter scale beds of greywacke fining towards the west. The Kintinian Formation is a thick package of shale and sandstone with a basal clast-supported conglomerate.

The orebodies are structurally controlled and the area has undergone at least three distinct phases of deformation, with initial N-S compression developing minor folds, the second and largest deformation event is associated with E-W to ENE WSW directed compression leading to N-S structural architecture, and the third event was a NW-SE compression that led to refolding of existing structures.

A deep oxidation (weathering) profile is developed in the region, varying between 50m to 150m. The mineralised saprolite currently provides the main oxide feedstock for the CIP processing plant, although a new treatment option has been approved to mine the fresh-rock extensions of the ore deposits.

Primary gold mineralisation occurs in all three lithostratigraphic units of the Siguiri region although the majority of known mineralisation is found in the central and more competent Fatoya Formation. In some deposits the mineralisation shows strong lithological control and is preferentially developed in coarser-grained units that have higher fracture/vein densities relative to fine-grained rocks.

Two styles of primary mineralisation have been recognised at Siguiri. The first is characterised by precipitation of gold-bearing pyrite associated with proximal albite and distal carbon alteration, and opening of carbonate-pyrite veins. The second style corresponds to ENE-WSW trending native gold bearing quartz veins with carbonate selvages which crosscut carbonate pyrite veins and show arsenopyrite (±pyrite) halos.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Siguiri is currently a multi-pit oxide gold mining operation, operated with a contract miner. The mining method is selective conventional techniques using excavators and trucks on 3m high flitches. Liebherr 994s and 984s excavators are the main loading equipment matched with CAT 777 dump trucks. A minimum mining unit (MMU) size suitable for selective mining and nominated mining equipment of 5m x 5m x 3m based on historical mined out grade control model is used simulate the expected mining dilution and ore losses and built in the geologic block models.


Crushing and Grinding


Processing

  • Gravity separation
  • Calcining
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Processing began in 1997 via heap leaching and was continued for eight years, after which the long term potential of the site as a heap leach became limited a CIP plant was built.

On the CIP plant, ROM ore is reduced by a toothed roll crusher and then transported overland to a mill feed stockpile. The crushed ore is withdrawn at a controlled rate, via apron feeders, and conveyed for treatment through a scrubber and conventional ball milling circuit. Mill product is pumped from a common sump through a cluster of 660mm cyclones with the underflow reporting to a 6MW Ball Mill. A bleed of the cyclone underflow is treated in a gravity circuit incorporating a Knelson concentrator and an Intensive Leach circuit which contributes about 25% of the final gold produced.

Overflow from the cyclone cluster gravitates to a leach train consisting of ten tanks where lime, cyanide and hydrogen peroxide are added to effect gold dissolution. Slurry from the leach circuit is then fe ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Head Grade, g/t 0.750.851.010.790.80.89

Production:

CommodityUnits201920182017201620152014
Gold koz  ......  Subscription required285381305300341
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Tonnes processed  ......  Subscription required10.5 Mt11.6 Mt12.1 Mt11.8 Mt11.9 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 72.33 Mt Gold 0.76 g/t 1.76 M oz
Total Resource 185.6 Mt Gold 0.95 g/t 5.7 M oz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Total cash costs Gold USD  ......  Subscription required 844 / oz 725 / oz 784 / oz 827 / oz 799 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required 930 / oz 796 / oz 915 / oz 965 / oz 917 / oz
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required96  82   58.8   29.4   30.6  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 26, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Jan 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 27, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Other 2016
Press Release 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Year-end Mineral Reserves 2015
Subscription required - Subscription is required.

Aerial view:

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