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Ghana
Wassa Southern Extension Project (Wassa)

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 Location:
22 km SW from Twifo Praso, Ghana

  Project Contacts:
Deila Court House No. 19 Patrice Lumumba Street Airport Residential Area P.O. Box 16075
Accra
Ghana
Phone  ...  Subscription required
Fax+1-233-302-779-041
EmailEmail
WebsiteWeb
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  • Overview
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  • Mining
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
  • Transverse stoping
  • Longitudinal stoping
  • Paste backfill
Mine Life11 years (as of Jan 1, 2020)


Owners

Source: p. 6
CompanyInterestOwnership
Government of Ghana 10 % Indirect
Chifeng Jilong Gold Mining Co., Ltd. 90 % Indirect
Golden Star holds a 90% interest in the Wassa gold mine through its 90% owned Ghanaian subsidiary, Golden Star (Wassa) Limited. The remaining 10% interest in Wassa is held by the Government of Ghana in accordance with applicable laws.
Jan. 28, 2022 /CNW/ - Golden Star Resources Ltd. (NYSE American: GSS) (TSX: GSC) (GSE: GSR) ("Golden Star" or the "Company") and Chifeng Jilong Gold Mining Co., Ltd. (SHSE: 600988) ("Chifeng") are pleased to announce the completion of the previously announced plan of arrangement under Section 192 of the Canada Business Corporations Act (the "Transaction"), involving the Company, Chifeng and its subsidiary Chijin International (Hong Kong) Limited ("Chijin"), and Chijin's assignee Kefei Investment (BVI) Limited (the "Assignee").
Pursuant to the Arrangement Agreement, Chifeng, through Chijin and the Assignee acquired all of the issued and outstanding common shares of Golden Star.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Orogenic
  • Vein / narrow vein


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 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 metasediments which are locally characterized as magnetite rich, banded iron formation like horizons.

The Wassa mineralization is subdivided into a number of domains: F Shoot, B Shoot, 242, South East, Starter, 419, Mid-East and Dead Man’s Hill. Each of these represents discontinuous segments of the main mineralized system which extends approximately 3.5 km along strike from surface and is still open at depth. The SAK deposits are located approximately 2 km to the southwest of the Wassa Main deposit on the northern end of a well-defined mineralized trend parallel to the Wassa Main trend. The SAK deposits are also located on the western side of a major regional east dippin ........


Mining Methods

  • Longhole open stoping
  • Transverse stoping
  • Longitudinal stoping
  • Paste backfill


Summary:

The Southern Extension will be accessed from existing underground workings via two declines, one on each side of the production panels.

The large mineralized footprint in the southern zone is accessed from two declines, east and west of the mineralization. The distribution of mineralization varies between the upper (4-6) and lower (7-8) panels. The layout of the production blocks is also different in the upper and lower panels.
- Panels 4-6: Three large production blocks on the east side with numerous smaller production blocks to the west. Blocks are spread across and along strike of the deposit, creating multiple independent production blocks.
- Panels 7-8: Reasonably uniform and continuous blocks on both sides of the deposit, merging at depth. More consistent geometry could be influenced by relatively wide spaced drilling (all of the Southern Extension classified as Inferred Resource), but panels 7 and 8 have the lowest drill hole density). However, should the geometry break apart with further drilling, the mining and access strategy is flexible in that the modular production blocks, with access from the two declines, can be moved around to match the geometry of the defined mineralization.

The majority of stopes in the Southern Extension zone will be mined using bottom-up, transverse Long Hole Open Stoping, with occasional longitudinal stopes where deposit widths are less than 15 m. Nominal stope lift dimensions are 20m along strike, up to 3 ........


Crushing and Grinding
Flow Sheet: Source

A four-stage fine crushing circuit is employed incorporating an open circuit primary jaw crusher followed by secondary, tertiary and quaternary cone crushers with the secondary and tertiary crushers operated in closed circuit with sizing screens. A single secondary, two tertiary and four quaternary crushers give a nominal crushed product size from the crushing circuit of 80% <8 mm.

Two independent milling circuits, each comprising a 5.03 m diameter x 6.7 m long ball mill fitted with 3 MW motors feeding individual clusters of classifying cyclones. Reported mill product size is around 70% <75 µm.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 2943,456
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily mining rate  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at December 31, 2020:
For Panel 4-Panel 5 cut-off grade is 2.3 g/t Au.
For Panel 6-Panel 8 cut-off grade is 2.9 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Inferred 30 Mt Gold 3.8 g/t 3.6 M oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2020 study / presentation.

Operating Costs:

Units2020
UG mining costs ($/t mined) USD 39.3 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Expansion CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 520.8
Backfill costs $M USD  ......  Subscription required
Refining costs $M USD  ......  Subscription required
Transportation (haulage) costs $M USD 21.6
G&A costs $M USD 203.1
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Subscription required - Subscription is required.


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

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 29, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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