South Africa

Prieska Mine

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Mine TypeOpen Pit & Underground
  • Copper
  • Zinc
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Drift & Fill
Mine Life... Lock
ShapshotThe Prieska Copper-Zinc Project (Prieska Project) continues to be the primary focus of the Company’s activities and is now in the financing and pre-development stage following the completion of an updated Bankable Feasibility Study (BFS) in the June 2020 Quarter (refer ASX / JSE release 26 May 2020). Updates to Environmental Permitting are being finalised and progress continues on the selection of the EPCM contractor. Preliminary site works have been completed in readiness for construction.


BEE 30 % Indirect
Orion Minerals Ltd. 70 % Indirect
Ownership Tree
Orion indirectly holds the majority ownership of Repli (70%), with the balance held by Prieska Resources (Pty) Ltd (Prieska Resources) (20%), the Orion Siyathemba Community Trust (Community Trust) (indirectly 5%) and the Orion Siyathemba Employee Trust (Employee Trust)(indirectly 5%).

Prieska Resources has BEE entrepreneurial companies as its shareholders, namely, Safika Resources (Pty) Ltd (44.72%), Kolobe Nala Investment Company (Pty) Ltd (37.97%) and Black Star Minerals (Pty) Ltd (17.31%).

Deposit type

  • VMS


The Prieska Deposit is a VMS-style deposit, with mineralisation defined along 2.4km of a northwest-southeast trending strike extent and down to a depth of 1.25km. Mineralisation of Cu, Zn, silver (Ag) and gold (Au) is in massive sulphides distributed as a persistent lens within gneiss rock assemblages.

Satellite deposit potential has been demonstrated with recent intersections of sulphide mineralisation at Ayoba, 5km from the proposed Prieska ore processing plant. Further afield, available historical data and recent exploration work by Orion has confirmed the existence of numerous follow-up massive sulphide Cu-Zn-rich targets within the nearby mineral tenements also held by Orion.

The mineralised zone outcrop has a strike of 2,400m, is oxidised and / or affected by leached and supergene enrichment to a depth of approximately 100m and crops out as a well- developed gossan. It has a dip of between 55° and 80° to the northeast at surface and a strike of 130° to the north. Current drilling indicates that the Deep Sulphides has a strike length of at least 2860m in depth.

The thickness of the mineralised zone exceeds 30m in places but averages between 7m and 9m. The mineralised zone persists to a depth of 1,100m (as deep as 1,228m in one section) after which it is upturned due to the folding.



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Mining Methods


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Crushers and Mills


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Copper Concentrate kt 1,125
Copper Metal in concentrate M lbs 498
Zinc Concentrate kt 1,302
Zinc Metal in concentrate M lbs 1,499
Zinc Equivalent Metal in concentrate t 1,644,000
Copper Equivalent Metal in concentrate t 386,000

Operational metrics

Annual processing capacity  ....  Subscribe
Ore tonnes mined, LOM  ....  Subscribe
Tonnes processed, LOM  ....  Subscribe
* According to 2020 study.

Production Costs

All-in sustaining costs (sold) Zinc Equivalent  ....  Subscribe
All-in sustaining costs (sold) Copper Equivalent  ....  Subscribe
Assumed price Zinc  ....  Subscribe
Assumed price Copper  ....  Subscribe
* According to 2020 study / presentation.

Operating Costs

Combined mining costs ($/t milled) AUD 38 *  
Processing costs ($/t milled) AUD  ....  Subscribe
Total operating costs ($/t milled) AUD  ....  Subscribe
* According to 2020 study.

Project Costs

MetricsUnitsLOM Total
Initial CapEx $M AUD  ......  Subscribe
Sustaining CapEx $M AUD  ......  Subscribe
OP/UG OpEx $M AUD  ......  Subscribe
Processing OpEx $M AUD 373.7
G&A costs $M AUD 142.5
Total OpEx $M AUD  ......  Subscribe
Income Taxes $M AUD  ......  Subscribe
Royalty payments $M AUD  ......  Subscribe
Gross revenue (LOM) $M AUD  ......  Subscribe
Net revenue (LOM) $M AUD  ......  Subscribe
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscribe
After-tax Cash Flow (LOM) $M AUD  ......  Subscribe
Pre-tax NPV @ 8% $M AUD  ......  Subscribe
After-tax NPV @ 8% $M AUD  ......  Subscribe
Pre-tax IRR, %  ......  Subscribe
After-tax IRR, %  ......  Subscribe
After-tax payback period, years  ......  Subscribe

Heavy Mobile Equipment

Fleet data has not been reported.


Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 13, 2024
....................... Subscription required ....................... Subscription required Subscription required Jan 13, 2024

Total WorkforceYear
...... Subscription required 2019

Aerial view:


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