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Senegal
Mako Mine

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 Location:
8 km W from Mako, Senegal

  Regional Office:
Almadies Zone 9 Route du Méridien Président, Villa Kandia
Dakar
Senegal
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
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life9 years (as of Jan 1, 2020)
Latest NewsResolute guides recovery from Syama delays     January 15, 2021


Owners & OPERATOR

Source: p. 43
CompanyInterestOwnership
African Mining Services (operator)
Resolute Mining Ltd. 90 % Indirect
Mako is owned by Petowal Mining Company S.A. (Petowal). Resolute has a 90% interest in Petowal and the Government of Senegal has a 10% interest in Petowal.

Deposit Type

  • Vein / narrow vein
  • Hydrothermal


Summary:

The Mako Mine is situated in eastern Senegal within the prolific Birimian age “Kenieba Window” geological complex that hosts multiple world class gold mining operations in eastern Senegal and western Mali.

Gold mineralisation is hosted mainly within the Felsic Unit which is sandwiched between two basalt sheets and is associated with disseminated and veinlet pyrite, quartz-carbonate-chlorite alteration and veining and is typified by zones of bleaching and hydrothermal brecciation within both the felsic unit and part of the Lower Basalt Unit.

Mineralisation is contained within a kilometre of strike length and over true widths varying between 5 and 40 metres. Mineralisation remains open at depth and previous deep drill holes have already identified higher grade shoots beneath the base of the open pit which are subject to further exploration to more fully assess their potential to support underground mining operations.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Ore extraction is by open pit using a conventional truck and shovel operation. The mining schedule utilises stock piling resulting in RoM head grade in excess of 2.5 g/t over the first six years of production. The Mining operations are performed by mining services contractor African Mining Services Senegal SUAL.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 3
SAG mill 8.5 MW 1

Summary:

The carbon in leach processing plant has 2.3Mtpa of capacity and comprises a crushing circuit, an 8.5MW SAG Mill and gold extraction circuit.

Run of Mine Pad and Crushing
Haul trucks will deliver ore directly from the Mine Pit to the ROM Pad.

The ROM Pad will be used to provide a buffer between the mine and the Process Plant. The ROM stockpile will allow blending of ore feed stocks, and will ensure a consistent feed type and feed rate to the Process Plant. ROM ore will be loaded into the crushing circuit feed bin (ROM bin) by a front end loader.

Processing activities will be conducted on a 24 hour, seven days a week and 52 week a year basis.

Primary Crushing and Reclaim
ROM ore will be drawn from the ROM bin at a controlled rate and will discharge onto the primary static grizzly. Grizzly oversize material will report to the jaw crusher and will be crushed. Crusher product and grizzly undersize will discharge onto the crushing screen feed conveyor which will discharge onto a vibrating screen.

The crushed material will be sized on the screen into three size fractions and will undergo secondary crushing for further size reduction where required. Crushed ore will be fed via the SAG mill feed conveyor directly to the grinding circuit. Quicklime, used for pH control in the leach circuit, will be metered directly onto the mill feed conveyor from the lime silo. There will also be a secondary crusher strategy on standby to provide continuity in plant production and offset any downtime associated with crusher liner change-outs (Toro Gold, 2015a).

Dust extraction will be provided at transfer points with dust periodically discharged to the adjacent conveyor belts.

Grinding and Classification
Crushed ore will be milled to achieve the required size for effective gold and silver5 recovery. The grinding circuit will consist of a SAG mill in closed circuit with a pebble crusher and hydrocyclones.

Crushed ore will be fed directly to the SAG mill and process water will be added to the SAG mill to achieve the correct milling density. The SAG mill will discharge to the pebble dewatering screen and oversize material will discharge onto a series of recycle conveyors. Tramp metal will be removed from the pebble stream by a magnet. The pebbles will be crushed by the pebble crusher and will discharge onto the SAG mill feed conveyor and be fed back to the SAG mill.

The pebble dewatering screen undersize will gravitate to the mill discharge hopper, be diluted with process water and pumped to the classifying hydrocyclone cluster.


Processing

  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Processing operations are completed via the use of an industry standard “Carbon in Leach” plant comprising of a crushing circuit, an 8.5MW SAG Mill and gold extraction circuit prior to discharge to a lined tailings facility via a cyanide destruct circuit. The processing facility is anticipated to achieve average life of mine gold recoveries of approximately 89.6 per cent from a target grind of P(80) 125µm.

The overall process is summarised as follows (Toro Gold, 2015b):

- Primary jaw crushing and partial secondary cone crushing of ROM ore to produce a crushed product size of 80% passing (P80) 143 mm;
- A crushed ore surge bin and overflow dead stockpile with reclaim of crushed ore from the surge bin;
- Single stage SAG milling in closed circuit with a pebble crusher and hydrocyclones to produce an 80% passing 125 micron grind size;
- Pre-leach thickening to increase the slurry density feeding the CIL circuit to minimise CIL tankage, improve slurry m ........

Recoveries & Grades:

CommodityParameter20192018
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.862.94
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
^ 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 rate  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 7,230 kt Gold 2 g/t 470 koz
Probable 3,860 kt Gold 2.2 g/t 270 koz
Proven & Probable 11,090 kt Gold 2.1 g/t 740 koz
Measured 8,940 kt Gold 1.8 g/t 520 koz
Indicated 9,140 kt Gold 1.8 g/t 540 koz
Inferred 1,250 kt Gold 1 g/t 40 koz
Total Resource 19,320 kt Gold 1.8 g/t 1,100 koz

Commodity Production Costs:

CommodityUnits202020192018
Cash costs Gold USD  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units2019
Capital expenditures M AUD  ......  Subscription required
Revenue M AUD  ......  Subscription required
After-tax Income M AUD  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of November 16, 2020:
HME TypeModelQuantityLeased or
Contractor
Drill (blasthole) ....................... Subscription required 7 Leased
Excavator 3 Leased
Truck (haul) ....................... Subscription required 14 Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Fact Sheet 2029
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Project Description 2015
Subscription required - Subscription is required.

News:

NewsDate
Resolute guides recovery from Syama delays January 15, 2021
Resolute bolsters gold portfolio with $400m Toro acquisition August 1, 2019

Subscription required - Subscription is required.

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