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Mali
Yanfolila Mine

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 Location:
30 km W from Yanfolila, Mali

  Regional Office:
Sebenikoro Villa Fatoumata Bangoura Cissoko, Lot B11 Commune iv
Bamoko
Mali
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
  • Sodium carbonate (reagent)
Mine Life7 years (as of Jan 1, 2017)
Yanfolila, in Mali, poured first gold in December 2017 and in April 2018 Yanfolila commenced commercial production.


Owners & OPERATOR

Source: p. 59, 81
CompanyInterestOwnership
African Mining Services (operator)
Government of Mali 20 % Indirect
Hummingbird Resources plc 80 % Indirect
Société des Mines De Komana SA (operator) 100 % Direct
Hummingbird Resources plc is an owner of 80% of Société des Mines De Komana SA (“SMK”) which owns and operates the Yanfolila Mine. 20% stake belongs to Government of Mali.

Deposit Type

  • Porphyry
  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The Yanfolila Greenstone Belt, which is orientated north-south on the eastern margin of the greater Siguiri Basin hosts the Project. This belt forms part of the Birimian Volcano-Sedimentary series of the West African Craton. The belt contains several sub-basins including the KMSB and the KSB. These sub-basins, and the eastern margin of the wider Siguiri Basin, are bound to the east by the SSZ and the Siekerolé Granite. The SSZ is the major basin-bounding structure in the region. Mineralisation is typical lode gold-style deposits structurally reminiscent of a foreland fold and thrust belt with a deformational framework similar to the hanaian Gold Province.

The KMSB hosts the majority of the Yanfolila gold deposits and targets currently defined. It has a stratigraphic sequence of basalt, polymict conglomerate, feldspathic sandstone, silt-shale, and a lithic-dominated greywacke. Mafic and felsic (porphyry, granodiorite, and diorite) intrusives crosscut the stratigraphy. Splays of the SSZ and regional-scale structures, which crosscut strata, control gold mineralisation. Gold is associated with rheological contrasting rock types that have been structurally deformed to provide fluid pathways from where any combination of disseminated, vein, breccia, intrusive, and replacement styles may evolve.

Outcrop is sparse throughout the basin and is mostly extensive lateritic and depositional terrains.

Lithologies at KW comprise interbedded siltstone and sandstone, with basalts and porphyry intrusives. Regional scale cross-cutting faults and structural lineaments, as well as rheologically contrasting rock types, appear to control the localisation of gold. Mineralisation appears to be related to basalt at the western margin along the main north-south shear zone as well as in the contact zone with metasediment. Feldspar porphyry has locally developed quartz-vein stockwork associated with pyrite and arsenopyrite. Main alteration minerals are sericite, silica, feldspar, chlorite, and epidote. Weathering and oxidation of the sulphide component generally extends to a depth of 50 to 90 m, with a well-developed regolith zone.

The host rocks at KE comprise a mafic dolerite intrusion in the south and a iltstone unit in the north. Mineralisation is quartz-albite-carbonate breccia veins and related pyrite-hematite altered February 2015 4 wall rocks associated with brittle-ductile shear zones. The orebody geometry strikes northsouth to north-northeast and dips steeply to the west and is transected by numerous northeast striking faults, some of which are mineralised. Weathering and oxidation of the sulphide component generally extends to a depth of 30 to 50 m, with a well-developed regolith zone.

At Sanioumale East (SE), the main lithologies include a sequence of basalt and metasediment (interbedded siltstone, sandstone, and polymict conglomerate). Mafic dyke (dolerite) as well as felsic porphyry dykes occur in the system. Mineralisation is hosted mainly in basalt and the dolerite dyke proximal to the contact with metasediment. The mineralisation style comprises quartz-albite carbonate breccia veins and related pyrite-hematite altered wall rocks associated with brittle-ductile shear zones. The orebody geometry is strikes north-south to north-northeast and dips steeply to the west, and is transected by numerous northeast striking faults, some of which are mineralised. Weathering generally extends to a depth of 30 to 50 m, with a welldeveloped regolith zone.

Sanioumale West (SW) lithologies include metasediments made up of sandstone and siltstone, as well as volcanoclastics with coarse grained feldspar and clasts. Mineralisation occurs in a deformed stratigraphic sequence of sandstone and siltstone including the volcanoclastics. Regional scale cross-cutting faults and structural lineaments, as well as rheologically contrasting rock types, appear to control the localisation of gold. Mineralisation styles are dominated by quartz feldspar-carbonate veins in shear zones with disseminated pyrite grains in the numerous fissures. Weathering generally extends to a depth of 30 to 60 m, with a welldeveloped regolith zone.

Guirin West (GW) lithologies comprise metasediments of inter-bedded siltstone and sandstone, with basalt; mafic, and felsic intrusives. Mineralisation appears to be related to a felsic intrusive and volcanoclastics hosting a stockwork of quartz feldspar-carbonate veins (10 to 50 cm in width). Weathering generally extends to a depth of 50 to 70 m, with a well-developed regolith zone.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Project will be developed by progressively mining five deposits: KE, KW, GW, SE, and SW. The Gonka deposit is also shown as it may be included in the Project at a later date. HUM will contract with a mining service provider to apply industry standard open pit mining methods to remove waste and ore from the deposits according to a mine production schedule. Mining methods will include excavating the soft oxidized ore near the surface, and drilling and blasting harder transitional and fresh rock. Haul trucks will follow haul roads to transport waste rock to engineered waste rock disposal facilities (WRD).

The mine fleet will transport ore to the plant via haul roads which will be constructed onsite. The mining rate will support the process production plant capacity by feeding the plant at least 1 Mtpa of gold bearing ore for the life of mine (LOM).


Crushing and Grinding


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
  • Sodium carbonate (reagent)

Flow Sheet: Subscription required

Summary:

Once the ore is fed into the process plant, it will undergo the following process steps to produce gold doré as shown in Figure 1.3.

Soft run of mine (ROM) ore will be fed into the process and initially crushed by a mineral sizer. The ball mill will grind the feed into finer particle size to enable gold recovery, with 80% of the mill product passing through a 106 µm screen. A select fraction of the mill output will be separated and fed into a gravity gold circuit which will apply centrifugal force to concentrate heavy, gold bearing particles for intensive leaching. Once leached, the gold bearing pregnant leach solution from the gravity circuit will be piped into an electrowinning cell. The gravity tails will be returned to the mill stream.

The main mill product will flow to the carbon in leach (CIL) process. The CIL process will apply controlled cyanide bearing leach solution to the finely ground ore to remove gold from the ore and deposit it on carbon. Approxima ........

Recoveries & Grades:

CommodityParameter20192018
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.882.83
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at October 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 388 kt Gold 1.65 g/t 20.6 koz
Probable 7,502 kt Gold 2.72 g/t 655.4 koz
Proven & Probable 7,890 kt Gold 2.66 g/t 676 koz

Commodity Production Costs:

CommodityUnits20192018
Cash costs Gold USD  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units20192018
Revenue M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of February 17, 2015:
HME TypeModelSize
Dozer ....................... Subscription required
....................... Subscription required ....................... Subscription required
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....................... Subscription required ....................... Subscription required
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....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 2, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 2, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 2, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Press Release 2016
Technical Report 2015
Subscription required - Subscription is required.

Aerial view:

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