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Sierra Leone
Lanti-Gangama Mine (Sembehun Expansion Project)

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 Location:
120km WSW from Kenema, Sierra Leone

  Regional Office:
20 Hill Cot Road Hillstation
Freetown
Sierra Leone
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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
  • Heavy Minerals
  • Rutile
  • Ilmenite
  • Zircon
Mining Method
  • Truck & Shovel / Loader
Processing
  • Electrostatic separation
  • Desliming
  • Spiral concentrator / separator
  • Flotation
  • Magnetic separation
Mine Life5 years (as of Jan 1, 2019)
World’s largest rutile mine


Owners

Source: p. 135
CompanyInterestOwnership
Iluka Resources Ltd. 100 % Indirect
Sierra Rutile Ltd. (operator) 100 % Direct
Sierra Rutile is a wholly owned subsidiary of Iluka Resources (Iluka).

Deposit Type

  • Mineral sands
  • Sedimentary


Summary:

The Sierra Rutile Area 1 (the Gangama and Lanti Deposits and other deposits within SRL’s current operations in Sierra Rutile Area 1) consists of a series of prominent hills and slight undulations with an elevation range of 0.9 meters above sea level (masl) along the mangroves, to 322 masl with the highest point being at Gbangbama Hill. The existing dredge ponds and rutile deposits are situated around the Imperi Hills region on the western and south-western extent, with the Lanti and Gangama expansion situated within the alluvial plains and mangrove swamps to the north west. The hills in the region have relatively steep slope angles and form prominent features in the landscape. The majority of the area adjacent to the hills comprises undulating, broad expansive fluvial plains, becoming increasingly flat towards the mangrove swamp areas.

The local geology is described as Tertiary aged alluvial deposits overlying the Precambrian high-grade quartzo-feldspathic-garnet gneiss (charnockite). The SR Area 1 heavy mineral sands placer deposits are hosted in the Bullom sediments which were deposited following a Tertiary marine regression with seas levels some 100 m below current levels. Mechanical and chemical weathering liberated heavy minerals from the underlying Kasila Group which were deposited in pre-incised channels.

Estuarine and marine unconsolidated sediments are located to the west of the major watershed located within the centre of SR Area 1. In contrast, alluvial and elluvial sediments were deposited subaerially to the north-east of the watershed. Several cyclic sequences comprising poorly sorted clastic gravels overlain by sands and clayey silts are preserved. Hard lateritic inclusions are common but are generally associated with the upper portions of the sequence.

The heavy minerals are generally angular and display little evidence of transport over long distances or extensive reworking. Grades rapidly decrease downstream with sand replacing the argillaceous material within the matrix.


Mining Methods

  • Truck & Shovel / Loader


Summary:

2019 was a year of major operational transition at Sierra Rutile. In February, Iluka decommissioned the dredge operation at the end of its life, as planned. This was followed by two major expansion projects being commissioned at Lanti and Gangama dry mines.

Currently dry mining: In-pit mining (Lanti), truck and shovel (Gangama).
[10/31/2019 Corporate Presentation, p. 41]

SRL has historically undertaken limited dry mining of small isolated deposits in fringe areas outside the larger economic deposits where dredge mining is used. The material was excavated and hauled to the nearest operating dredge pond where it was stockpiled in the dredge ponds to be processed with the dredged material (CEMMATS, 2012).
[March 2018 Environmental Assessment, p.17]


Crushing and Grinding


Processing

  • Electrostatic separation
  • Desliming
  • Spiral concentrator / separator
  • Flotation
  • Magnetic separation

Source: Subscription required

Summary:

During 2019 Iluka completed projects doubling the capacity at both the Lanti and Gangama mining operations in Sierra Leone.

The doubling of capacity of both the Gangama and Lanti dry operations from 500-600 tonne per hour to 1,000-1,200 tonne per hour. [31/06/2019 QREV-Q2, p. 7]

The Gangama project involved the addition of mining fleet and construction of a second concentrator, duplicating the design of existing operations. Commissioning of the Gangama concentrator began in May and was operating at design capacity by June.

At Lanti, a second mining unit was added and the floating concentrator from the decommissioned dredge operation was beached and refurbished. Construction and commissioning activities were completed during August. Both projects were delivered on schedule and on budget.

Concentrator Plants at Lanti: DM1-Commissioned 2013; DM4 - Repurposed concentrator from dredge operations.
Concentrator Plants at Gangama: DM2:1 - C ........

Recoveries & Grades:

CommodityParameter202020192018
Heavy Minerals Head Grade, %  ......  Subscription required  ......  Subscription required3
Heavy Minerals Concentrate Grade, %  ......  Subscription required  ......  Subscription required71.4
Rutile Concentrate Grade, %  ......  Subscription required  ......  Subscription required47.7
Ilmenite Concentrate Grade, %  ......  Subscription required  ......  Subscription required20
Zircon Concentrate Grade, %  ......  Subscription required  ......  Subscription required3.7

Production:

CommodityProductUnits202020192018
Heavy Minerals Concentrate kt  ......  Subscription required  ......  Subscription required240
Rutile Mineral in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Ilmenite Mineral in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zircon Mineral in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018
Ore tonnes mined  ......  Subscription required8,278 kt8,227 kt
Waste  ......  Subscription required
Tonnes processed  ......  Subscription required290 kt of heavy minerals concentrate242 kt of heavy minerals concentrate
Subscription required - Subscription is required.

Reserves at December 31, 2020:
The total Ore Reserves and Mineral Resources for the Sierra Leone rutile deposits - Lanti and Gangama mines (Lanti, Gangama, Gbeni deposits) and Sembehun project (Benduma, Dodo, Kamatipa, Kibi and Komende deposits).

CategoryTonnage CommodityGradeContained Metal
Proven 29 Mt Rutile 1.5 % 0.4 Mt
Probable 239 Mt Rutile 1.3 % 3.2 Mt
Proven & Probable 268 Mt Rutile 1.4 % 3.6 Mt
Measured 90 Mt Rutile 1.4 % 1.2 Mt
Measured 90 Mt Ilmenite 0.9 %
Measured 90 Mt Zircon 0.1 %
Indicated 463 Mt Rutile 1.1 % 4.9 Mt
Indicated 463 Mt Ilmenite 1 %
Indicated 463 Mt Zircon 0.1 %
Inferred 162 Mt Rutile 1.1 % 1.8 Mt
Inferred 162 Mt Ilmenite 0.7 %
Inferred 162 Mt Zircon 0.1 %
Total Resource 715 Mt Rutile 1.1 % 7.9 Mt
Total Resource 715 Mt Ilmenite 0.9 %
Total Resource 715 Mt Zircon 0.1 %

Commodity Production Costs:

CommodityUnits202020192018
Cash costs Heavy Minerals AUD  ......  Subscription required  ......  Subscription required 1,155 / t
Subscription required - Subscription is required.

Financials:

Units202020192018
Revenue M AUD  ......  Subscription required  ......  Subscription required205.7  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required-14.5  
EBIT M AUD  ......  Subscription required  ......  Subscription required-12.5  
EBITDA M AUD  ......  Subscription required  ......  Subscription required30.2  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Environmental Assessment 2018
Annual Report 2017
Press Release 2017
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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