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Guinea
Lefa Mine

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 Location:
100 km NW from Siguiri, Guinea

  Address:
Résidence 2000, Corniche Coléah Sud – Commune de Matam
Conakry
Guinea
BP 2162
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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
Production Start...
Mine Life2031


Owners

Source: p. 53
CompanyInterestOwnership
Government of Guinea 15 % Indirect
Nord Gold plc 85 % Indirect
Societe Miniere de Dinguiraye SA (operator) 100 % Direct
The mine was acquired by the Company at the end of July 2010, as part of the Crew Gold Corporation acquisition. The Company holds Lefa through Crew Gold Corporation Ltd (in which the Company has a 100% interest), which in turn holds an indirect 85% interest in Société Minière de Dinguiraye S.A. (“SMD”), which owns Lefa. The remaining 15% of shares in SMD are held by the Guinean government.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The Lefa gold mine lies within the Siguiri Basin, part of the Paleoproterozoic Birimian terrain of the West African Craton. Host lithologies are typically Paleoproterozoic (2.2-2.1 Ga) volcanosedimentary greenstone belts, metamorphosed to greenschist facies (or higher) and intruded by felsic plutons. Deformation is associated with a system of NE-SW trending crustal-scale ductile shear zones, related to the Eburnean orogeny, a protracted series of orogenic events spanning 2.2-2.0 Ga. These deformation zones are considered fundamental to the development of gold mineralisation.

Localised finely-laminated white and pale yellow limestones occur towards the north of the licence. Three post-Birimian sedimentary packages occur within the Lefa area, namely:
- Neoproterozoic fluvial and shallow marine sandstones;
- Eocene paleo-valley fill loosely consolidated sandstones; and
- post Post-Eocene transported colluvium.

Intrusive lithologies within the basin consist of basic to intermediate sheet intrusives and the Maléa intrusion. Two sets of dykes are identified, corresponding to a swarm which exhibits trends of circa 105-285° and 055-235°. In addition to the dykes, the basin is also intruded by numerous dolerite sills ranging from a few metres to tens of metres in thickness.

Mineralisation at Lefa is hosted within the “Lefa Corridor”, which lies within the Siguiri Basin. This is a zone which is some 10 km wide, underlain by an upper clay ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Lefa gold mine operates a typical modern open pit operation with drilling and blasting followed by load and haul allowing for selective mining of the ore. The material lithologies are divided into four main categories Saprolite, Laterite, Transition and Fresh. Saprolite and Laterite are also referred to in combination as oxide material. SMD has taken over the ownership and operation of the mining fleet as well as undertaking the mine planning, scheduling, grade control, surveying and quality control.

The current fleet capacity is sufficient, with only rebuilding and some replacement capital necessary over the remaining period of the Base Case LoMp to Q1 2030.

Current mining operations at Lefa are focused on various open pits. Total planned mining production, as per the Base Case schedule, from 2021 onwards is approximately 36 Mtpa going down to 28 Mtpa from 2025 to 2028 after which it tapers down to the end of the LoM in 2031.

The Company has commenced studies relating to underground mining beneath the main Lero-Karta open pit.

Open Pit Geotechnical Considerations
The Lefa gold mining complex in Guinea is formed of a number of open pits of varying degrees of maturity. The largest open pit is the Lero-Karta-Camp de Base operation which is the main source of ore and mines both oxide and fresh material. The Fayalala, Banko, Kankarta and Firifirini open pits also mine oxide and transition/fresh material while the remainin ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2021202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required188209195214
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required41.1 Mt38,155 kt34,539 kt26,473 kt
Ore tonnes mined  ......  Subscription required6,755 kt6.69 Mt6.46 Mt6,137 kt6,019 kt
Waste  ......  Subscription required34.4 Mt31,466 kt28,076 kt20,336 kt
Stripping / waste ratio  ......  Subscription required5.09 4.7 4.34 3.31 3.15
Tonnes processed  ......  Subscription required6.03 Mt6,181 kt6,911 kt6,599 kt6,558 kt
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Reserves at December 31, 2020:
Cut-off grades for resources range from 0.27 to 0.48 g/t Au for open-pit and are 1.4 g/t Au for underground.
Cut-off grades for reserves range from 0.3 to 0.6 g/t Au depending on deposit.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 0.181 Mt Gold 0.9 g/t 6 koz
Probable Heap leach 5.659 Mt Gold 0.6 g/t 109 koz
Probable Stockpiles 6.8 Mt Gold 0.6 g/t 124 koz
Probable In-Situ (OP) 32.571 Mt Gold 1 g/t 1.042 koz
Probable Total 45.029 Mt Gold 0.9 g/t 1,275 koz
Proven & Probable Heap leach 5.659 Mt Gold 0.6 g/t 109 koz
Proven & Probable Stockpiles 6.8 Mt Gold 0.6 g/t 124 koz
Proven & Probable In-Situ (OP) 32.751 Mt Gold 1 g/t 1,048 koz
Proven & Probable Total 45.21 Mt Gold 0.9 g/t 1,281 koz
Measured Total 0.309 Mt Gold 1.25 g/t 12 koz
Indicated Total 94.078 Mt Gold 1.02 g/t 3,083 koz
Measured & Indicated Total 94.387 Mt Gold 1.02 g/t 3,095 koz
Inferred Total 26.137 Mt Gold 1.62 g/t 1,365 koz
Total Resource Total 120.524 Mt Gold 1.15 g/t 4,460 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 807 / oz†   713 / oz†   710 / oz†   643 / oz†  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required† 1,205 / oz†   943 / oz†   1,015 / oz†   832 / oz†  
† Net of By-Product.
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Operating Costs:

Units20202019201820172016
Processing costs ($/t milled) USD 11.31211.79.539.25

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 74.6   47.9   79.8  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required 72.2   49.7   59.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 239   263.5   242  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 87.4   114.5   103.4  
Operating Cash Flow M USD 108.2  
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Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of March 1, 2021:
HME TypeSizeQuantity
Truck (haul) 100 t ....................... Subscription required
Truck (haul) 40 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 15, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Press Release 2018
Annual Report 2017
Press Release 2017
Integrated Report 2016
Technical Report 2009
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