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Mali
Nampala Mine

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 Location:
59 km SW from Sikasso, Mali

  Regional Office:
Rue 50, porte 901 Badalabougou
Bamako
Mali
B.P. 1939
Phone  ...  Subscription required
Fax011-223-76-41-20-21
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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 Life10 years (as of Jan 1, 2021)
Latest NewsRobex: Rapid Restart of Operations at Nampala, Mali     December 16, 2022


Owners

Source: p. 5,78
CompanyInterestOwnership
Government of Mali 10 % Indirect
Robex Resources Inc. 90 % Indirect
Nampala SA. (operator) 100 % Direct
Robex Resources currently operates the Nampala mine. Nampala SA is 90% owned by Robex. The Malian government was awarded 10% of Nampala SA's shares for free.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Orogenic
  • Mesothermal


Summary:

Specifically, the Nampala deposit can be classified as a turbidite-hosted structurally controlled orogenic (mesothermal) lode-gold system.

Gold mineralization is primarily hosted in competent coarse-grained sedimentary rock where brittle fracturation, openings and veining occurred. Gold is associated to structurally controlled tension quartz vein systems and stockworks developed in the brittle fractures and in areas of increased porosity as a result of the deformation of the more competent coarse-grained greywacke, siliciceous sandstone and sandstone.

Shear zones are developed in the more ductile adjacent (or locally intercalated) shales (particularly the graphitic shale) and are commonly barren. Some narrow NNE-trending subvertical shear corridors are exposed in the pit from north to south and have been traced nearly continuously to the southernmost drill hole of the 2017-2018 drilling program.

Some anomalous gold values can also be found locally in the chill margins or along the contact of the intermediate intrusives. Local brittle deformation seems to have created space for tension quartz veins to penetrate the fringe of the stock and this seems to be confirmed by resistivity and conductivity geophysical maps which display what seem to be a slight NE/SW and NW/SE fracture pattern. This corresponds to the general orientation of the mineralization in the mine where mineralized domains are oriented 020°N and are controlled laterally by subve ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Nampala Mine is excavated using a conventional truck and shovel operation. The widest equipment used by the contractors is a Caterpillar 773B haul truck matched with a 385 hydraulic excavator. The ore and waste are composed mostly of saprolite located in the oxidized horizon. No drilling and blasting are required to access the current Mineral Reserve. A total of 7 pits are planned to recover the identified Mineral Reserve.

The pit designs follow closely the Pit Shell provided by the pit optimizer when evaluating the Mineral Reserve and the pit design parameters. The access ramp centerline follows mostly the Pit Shell of the Mineral Reserve. For operational purposes, only openings identified by the optimizer which are wider than 100 m in diameter are converted to pit designs.

Pit design parameters:
- Ramp Grade - 10%;
- Bench height - 10 m;
- Minimum catch bench width - 5 m;
- Maximum face angle - 70o;
- Design face angle - 67o;
- Maximum pit slope - 45o;
- Minimal opening diameter - 100 m.

The ore body is subvertical and located predominantly in the center of each pit. This allows the access ramps to be positioned mostly in the waste to avoid leaving ore in the pit walls. Also, since the Lower Transition material is not part of the Mineral Reserve, it is left in place in the lower part of the pit. This constrains the pit design along the near-h ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required44,94636,99712,051
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,873,721 t1,797,809 t1,451,497 t680,621 t
Waste  ......  Subscription required  ......  Subscription required3,458,443 t2,951,212 t2,184,546 t1,613,814 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required1.8 1.6 1.5 2.4
Tonnes processed  ......  Subscription required  ......  Subscription required1,909,663 t1,795,591 t1,615,966 t719,090 t
Daily processing rate  ......  Subscription required  ......  Subscription required4,400 t
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Reserves at February 15, 2021:
The Mineral Reserve was estimated using cut-off of 0.28 g/t in the Oxide and 0.31g/t in the Upper Transition.

The Mineral Resource was estimated using cut-off of 0.25 g/t in the Oxide, 0.33 g/t in the Transition and 0.71 g/t in the Fresh Rock.

CategoryTonnage CommodityGradeContained Metal
Probable 17,147 kt Gold 0.71 g/t 391 koz
Inferred 555 kt Gold 0.9 g/t 16 koz
Total Resource 32,838 kt Gold 0.75 g/t 788 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Total cash costs (sold) Gold CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required 643 / oz   618 / oz  
All-in sustaining costs (sold) Gold CAD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 973 / oz   906 / oz  
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units20212020201920182017
Total operating costs ($/t milled) CAD 1817161513

Financials:

Units20212020201920182017
Sustaining costs M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required 15.5   10  
Revenue M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required 78.4   57.2  
Operating Income M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required 25.4   22.6  
Operating Cash Flow M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required 26.9   23.2  
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Heavy Mobile Equipment as of July 31, 2020:
HME TypeModelQuantityLeased or
Contractor
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
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Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Technical Report 2018
Management Discussion & Analysis 2017
Quarterly Report 2016
Technical Report 2012
Feasibility Study Report 2011
Subscription required - Subscription is required.

News:

NewsDate
Robex: Rapid Restart of Operations at Nampala, Mali December 16, 2022
Robex: Incident at Nampala, Mali December 15, 2022

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