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Ghana
Iduapriem Mine

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 Location:
49 km NW from Takoradi, Ghana

  Regional Office:
Gold House, Patrice Lumumba Road
PO Box 2665
Accra
Ghana
Phone  ...  Subscription required
Fax+233-303-778155
WebsiteWeb
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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
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Calcining
  • Gravity separation
  • Centrifugal concentrator
  • Inline Leach Reactor (ILR)
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Latest NewsAngloGold Ashanti & RAMJACK pioneer ROC as-a-service to target OEE improvement for Iduapriem     December 10, 2021


Owners

Source: p. 18
CompanyInterestOwnership
AngloGold Ashanti Ltd. 100 % Indirect

Deposit Type

  • Conglomerate hosted


Summary:

The Banket Series in the mine lease areas form prominent, arcuate ridges extending southwards from Tarkwa, westwards through Iduapriem and northwards through Teberebie to Mantraim. The ridge segments are supported by a massive lithological unit known as the Footwall Quartzite, which is a strongly-bedded rock of blue-grey colour exhibiting a sub-parallel haematitic/black sand banding and which locally forms the basal stratigraphic unit to the Banket Reef Zone (BRZ).

The BRZ comprises a sequence of individual beds of quartz pebble conglomerates (Banket beds), breccia conglomerates, metasandstones (also called quartzites and grits). All known gold mineralisation within the Banket Formation is associated with the conglomerates and is found within the matrix that binds the pebbles together. Gold content is presumably a function of the size and amount (packing) of quartz pebbles present within a conglomeratic unit- more pebbles present suggest more gold.

Gold mineralisation is hosted by conglomeratic sedimentary packages referred to as zones or reefs and is considered to be of primary palaeoplacer origin. There are four recognized reefs, namely A, B, C and D and which are equivalent to the Tarkwaian Sub-Basal, Basal (or Main), Middle (or West) and Breccia Reefs respectively. The B and C reefs are oligomictic, and consist of well sorted conglomerates and have been mined underground in some areas for over a century. The A and D reefs have a lower gold tenor and are polymictic containing both well rounded and angular fragments. The gold is fine-grained, free and not associated with sulphides. The main ancillary mineral is magnetite.

At Iduapriem, the entire Tarkwaian Group has been folded into a broad syncline, locally referred to as the Tarkwa Syncline. The reefs are stratigraphically located within the Banket Formation and are the locus of the mine towards the southern closure of the Tarkwa Syncline. With the gold mineralisation being stratabound, the characteristics of the mineralisation are defined by the reefs. The Tarkwa Syncline covers the eastern portion of the lease (Blocks 1-8), with the Ajopa deposit located in the north-western lease on the western limb of the Ajopa anticline.

For blocks 1 to 8, the pits are numbered sequentially from east to west across both limbs of the Tarkwa Syncline. These limbs, which outcrop and express themselves as topographic ridges, trend NE on the easterly limb and NNE on the westerly limb. The closure of the syncline results in an east-west cuspate shape to the reefs at the southern limits of the Banket formation. Reef dips are variable and reflect the structural complexity of the basin. The eastern limb of syncline dips steeply 70-80 degrees towards the west, however this changes to the south where the dips become steeper, eventually becoming overturned and southerly dipping at the southern margin of the basin in the vicinity of blocks 1 and 2. Moving westwards to block 3, the dips again dip into the syncline and flattening to approximately 50 degrees by Block 3 east. At Blocks 7 and 8, which are the dominant constituents of the Ore Reserve, the reefs dip 35 to 30 degrees to the west. Reef packages vary in thickness, with those in Blocks 7 and 8 being between 3 and 10m thick, but in the vicinity of Block 1 reefs thin, onlap and thicken due to thrusting.

At Ajopa, where the reefs are expressed as a topographic ridge striking NE-SW, dips are generally 50 to 60 degrees to the west. All four reefs are present, however the B and C reefs are more dominant and thicknesses vary between 3m and 8m.

Faulting is common and major faults are believed to be contemporaneous with the folding. Within the Tarkwa Syncline, faults form bounding structures to the blocks and separate the individual pits from each other.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Iduapriem is a multiple open pit operation that currently sources ore from the Block 3W, Ajopa, and Blocks 7 and 8 pits. More recently the Block 5 pit was re-instated in the mining plan.

Mining operations is conducted via mining contractor, AMAX Mining Services. It uses conventional drill and blast, with truck and excavator load and haul.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher ....................... Subscription required 1
Cone crusher ....................... Subscription required 2
SAG mill 2
Ball mill 2

Summary:

The current processing plant treats free-milling material from open-cast mining, by a conventional crush with a semi-autogenous ball milling circuit.

Iduapriem operates a two stage crushing circuit consisting of a 54-75 primary gyratory crusher and two GP 550 gyratory crushers for secondary crushing.

The Iduapriem treatment plant has two semi-auto geneous grinding mills (SAG mills) and two ball mills which run in two parallel circuits, each with a SAG mill and a ball mill.


Processing

  • Calcining
  • Gravity separation
  • Centrifugal concentrator
  • Inline Leach Reactor (ILR)
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Iduapriem Mine started operating in June 1992. The original plant, designed to treat about 2.4Mtpa of ore, has undergone several expansions. The most recent expansion work was completed and commissioned in 2009 which incorporated a new 800tph 2-stage crushing plant, a second ball mill at the CIL plant together with a 24 meter diameter thickener, a second Knelson concentrator, and an upgrade of the oxygen plant capacity from 4.0 to 8.0 tonnes per day. The main objective of the expansion project was to increase plant throughput to 4.3Mtpa.

A gravity circuit comprising of 2 XD48 centrifugal (Knelson) concentrators and an In-line Leach Reactor (ILR – Series 1000) recovers free gold (gravity gold) by processing the dense particles from the cyclone underflow slurry. Each circuit has 1 Knelson and part of the cyclone underflow is bled to feed the Knelson.

The concentrator operates in batch mode. Once the preset time has elapsed, the unit goes through a flush cycle ........

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required1.471.41.31.27

Production:

CommodityUnits2021202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required254228214193
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Plant annual capacity  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required5.1 Mt5.3 Mt5.1 Mt5.1 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Reserves cut-off grades are 0.85 g/t Au for ore from Ajopa, 0.80 g/t Au for ore from Block 5, 7, 8 and full grade ore stockpile, 0.60 g/t Au for marginal and other ore stockpiles.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 59.4 Mt Gold 1.36 g/t 2.6 M oz
Total Resource 130.22 Mt Gold 1.4 g/t 5.88 M oz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 804 / oz 823 / oz 908 / oz 995 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Gold USD 977 / oz 1,033 / oz 950 / oz 1,020 / oz
Subscription required - Subscription is required.

Financials:

Units2021202020192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required43   51   8   15  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2016:
HME TypeModelQuantityLeased or
Contractor
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 25, 2022
....................... Subscription required ....................... Subscription required Subscription required May 25, 2022
....................... Subscription required ....................... Subscription required Subscription required May 25, 2022
....................... Subscription required ....................... Subscription required Subscription required May 25, 2022
....................... Subscription required ....................... Subscription required Subscription required May 25, 2022
....................... Subscription required ....................... Subscription required Subscription required May 25, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
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 2021
................................... 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 2020
................................... Subscription required 2020
................................... 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
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Other 2015
Year-end Mineral Reserves 2015
Subscription required - Subscription is required.

News:

NewsDate
AngloGold Ashanti & RAMJACK pioneer ROC as-a-service to target OEE improvement for Iduapriem December 10, 2021
Perenti contract extends AngloGold Ashanti relationship July 19, 2021

Aerial view:

Subscription required - Subscription is required.

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