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Ghana
Wassa Mine (Wassa Southern Extension Project)

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 Location:
22 km SW from Twifo Praso, Ghana

  Regional Office:
Deila Court House No. 19 Patrice Lumumba Street Airport Residential Area
P.O. Box 16075
Accra
Ghana
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Fax+1-233-302-779-041
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life6 years (as of Jan 1, 2021)
Chifeng progressing Southern Extension of Wassa Mine to add 11 years to reserve life. FS for Southern Extension is targeted for the end of 2022.


Owners

Source: p. 34
CompanyInterestOwnership
Government of Ghana 10 % Indirect
Chifeng Jilong Gold Mining Co., Ltd. 90 % Indirect
Golden Star Wassa Ltd. (operator) 100 % Direct
Golden Star has a 90% interest in the project, with a 10% carried interest held by the Government of Ghana.

As of 28 Jan 2022, Chifeng completed the acquisition of 100% stake in Golden Star Resources, which owns 90% of Wassa gold mine, with a consideration of US$470m.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

The Wassa property lies within the southern portion of the Ashanti Greenstone Belt along the eastern margin of the belt within a volcano-sedimentary assemblage located at proximity to the Tarkwaian basin contact. The eastern contact between the Tarkwaian basin and the volcanosedimentary rocks of the Sefwi group is faulted, but the fault is discrete as opposed to the western contact of the Ashanti belt where the Ashanti fault zone can be several hundred meters wide. Deposition of the Tarkwaian sediments was followed by a period of dilation and the intrusion of late mafic dykes and sills.

The Wassa deposit is located on the eastern flank of the northeast trending Ashanti Belt, a Paleoproterozoic greenstone belt which was formed and deformed, along with the dividing Birimian and Tarkwaian sedimentary basins during the Eoeburnean and Eburnean orogeny. Most deposits found within the Ashanti belt can be classified as lode gold deposits or orogenic mesothermal gold deposits, with the exception of the Tarkwaian paleoplacer deposits which have a sedimentary origin.

The Wassa lithological sequence is characterized by lithologies belonging to the Sefwi Group and consisting of intercalated meta-mafic volcanic and meta-diorite dykes with altered meta-mafic volcanic and meta-sediments which are locally characterized as magnetite rich, banded iron formation like horizons

The Wassa mineralization is subdivided into a number of domains, namely; F Shoot, B Sho ........


Mining Methods

  • Longhole open stoping
  • Paste backfill


Summary:

In early 2018 Wassa transitioned into an underground-focused operation.

Mining is by underground with trackless access by decline (1:7 gradient), operated by GSWL personnel. The method is long hole open stoping (LHOS), mostly with transverse uphole stopes, in 25 m lifts, mined topdown, in primary/secondary sequence. Stable unsupported stope heights are up to 100 m and stopes are mined to full orebody width. The mine is divided into Panels, which reflect progressive stages of capital development. The Mineral Reserve includes Panels 1, 2 and 3, which lie between 150-650 m depth.

Panels 1 and 3
• Stope length is 25 m along strike with 6-10 m pillars between.
• Stope width is full width of the orebody which can be up to 35 m but is usually 15-25 m.
• Stopes are mined with uphole blastholes drilled from below. The stope lifts are extracted in a topdown sequence; each stope lift is extracted below the open stope void above. Up to four stope lifts are extracted to create a continuous excavation up to 100 m high.
• In Panels 1 and 3, the 100 m height limit usually enables full extraction of the orebody without the need for sill pillars. Where this is not the case, a sill pillar is left in the level between the sets of stopes.
• Mined voids are generally left open with some loose rock fill to dispose of waste or for opportunistic pillar recovery.
• Narrower ore zones (<15 m) are mined as longitudinal stopes with progressive placement ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required150137104
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Annual processing capacity  ......  Subscription required2.7 Mt2.7 Mt
Total tonnes mined  ......  Subscription required  ......  Subscription required1,784,746 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,421,742 t1,129,499 t2,282,145 t2,496,817 t
Waste  ......  Subscription required  ......  Subscription required363,004 t381,803 t6,236,916 t9,974,537 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required3,895 t2,900 t
Tonnes processed  ......  Subscription required  ......  Subscription required1,548,486 t1,600,884 t2,616,842 t2,622,594 t
Daily processing capacity  ......  Subscription required  ......  Subscription required7,800 t
Daily processing rate  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Open pit deposits within the Mineral Resource are reported at a cut-off grade of 0.55 g/t.
Underground deposits within the Mineral Resource are reported at a cut-off grade of 1.4 g/t.
The Mineral Reserve is reported at a cut-off grade of 1.9 g/t

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable Stockpiles 0.69 Mt Gold 0.58 g/t 13 koz
Proven & Probable In-Situ (UG) 10.81 Mt Gold 3.1 g/t 1,076 koz
Proven & Probable Total 11.5 Mt Gold 2.94 g/t 1,089 koz
Measured & Indicated In-Situ (OP) 3.11 Mt Gold 1.97 g/t 197 koz
Measured & Indicated In-Situ (UG) 26.16 Mt Gold 3.97 g/t 3,340 koz
Measured & Indicated Total 29.26 Mt Gold 3.76 g/t 3,537 koz
Inferred In-Situ (OP) 0.87 Mt Gold 1.47 g/t 41 koz
Inferred In-Situ (UG) 73.16 Mt Gold 3.46 g/t 8,143 koz
Inferred Total 74.02 Mt Gold 3.44 g/t 8,183 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 629 / oz   880 / oz   941 / oz   838 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required 886 / oz  
Subscription required - Subscription is required.

Financials:

Units20202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required 35.4   21.6   41.8  
Revenue M USD  ......  Subscription required  ......  Subscription required 183.1   167.4   112.3  
Operating Income M USD  ......  Subscription required  ......  Subscription required 48.8  
After-tax Income M USD  ......  Subscription required  ......  Subscription required 28   17.6  



Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelSizeQuantity
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 18 t ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 18 t ....................... Subscription required
Load-Haul-Dump (LHD) 18 t ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 21 t ....................... Subscription required
Truck (underground) ....................... Subscription required 40 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2022
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Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Other 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Financial Review 2018
Management Discussion & Analysis 2018
Press Release 2018
Technical Report 2018
Press Release 2016
Technical Report 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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