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South Africa
Prieska Project

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 Location:
50 km SW from Prieska, South Africa

  Project Contacts:
Dunkeld Court 16 North Rd, Dunkeld West, Randburg
Johannesburg
South Africa
2196
Phone  ...  Subscription required
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  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit & Underground
Commodities
  • Copper
  • Zinc
Mining Method
  • Truck & Shovel / Loader
  • Drift & Fill
  • Longhole open stoping
Processing
  • Flotation
Mine Life9.7 years (as of Jan 1, 2019)
The 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.
Latest NewsOrion Minerals secures a double-win     May 9, 2022


Owners

Source: p. 6
CompanyInterestOwnership
BEE 30 % Indirect
Orion Minerals Ltd. 100 % Indirect
Orion completed the acquisition of Agama Exploration and Mining (Pty) Ltd (Agama) in March 2017. Through Agama’s subsidiary companies, Repli Trading No 27 (Pty) Ltd (Repli) and Vardocube (Pty) Ltd (Vardocube), Orion will hold a 70% interest in both the Repli Prospecting Right and the Vardocube Prospecting Right, after reducing its shareholdings in line with South African regulations and policy relating to Black Economic Empowerment (BEE). Together these tenements cover the Project site.
The remaining ownership of the Project is to be held by BEE companies (20%), a community fund (5%) and an employee share scheme (5%), as guided by legislative and Mining Charter III prescriptions for promoting transformation.

Deposit Type

  • VMS


Summary:

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.


Mining Methods

  • Truck & Shovel / Loader
  • Drift & Fill
  • Longhole open stoping


Summary:

Both open pit and underground mining are planned for the duration of the Foundation Phase. Underground mining is planned to commence on completion of mine dewatering, shaft refurbishment and underground infrastructure establishment, some 24 months from site mobilisation. Underground mining is then scheduled to build up over 14 months to a steady-state run-of-mine production rate of 200ktpm (kilo tonnes per month) or 2.4Mtpa (million tonnes per annum).

Tunnel development remaining from the previous mining operations allows for early access to underground production mining areas. A combination of Longhole Open Stoping with Fill (LHOSF) and Drift-and-Fill (D&F) mining methods will be used, supported with paste back-filling. Some low-profile, D&F mining is planned in the latter years, along with open-pit mining of the near-surface +105 Level Supergene Deposit in the back two years of the mining plan.

Some 20.8Mt of material at an average grade of 1.1% Cu and 3.4% Zn is planned to be mined and processed to produce 189kt of Cu and 580kt of Zn contained in differentiated concentrates during the Foundation Phase.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Ore processing is planned to involve conventional differential froth flotation to produce separate copper and zinc concentrates at average grades of 24% Cu and 50% Zn from underground mined material. Minor modifications to the processing plant will allow the open-pit material to be treated at the end of the mine life, on a campaign basis, to produce separate copper and zinc concentrates at average grades of 26% copper and 36% zinc.

The flowsheet for processing underground material is similar to the flowsheet used during previous mining operations. Life-of-mine metal recoveries into concentrates are anticipated to be 84.4% for Cu and 83.9% for Zn from treating underground mined material and 66.7% and 59.4% for Cu and Zn respectively for open-pit mined material.

The concentrates will be trucked to Groveput, 50km from site, and then railed to the Port of Ngqura (at Coega) for export to smelters in Asia and Europe. Net smelter returns for the Cu and Zn concentrates ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Copper Recovery Rate, % 82.7
Copper Head Grade, % 1.1
Copper Concentrate Grade, % 23.8
Zinc Recovery Rate, % 83
Zinc Head Grade, % 3.35
Zinc Concentrate Grade, % 49.9

Projected Production:

CommodityProductUnitsLOM
Copper Concentrate kt 790
Copper Metal in concentrate M lbs 417
Zinc Concentrate kt  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required
Zinc Equivalent Metal in concentrate t  ......  Subscription required
Copper Equivalent Metal in concentrate t  ......  Subscription required

Operational Metrics:

Metrics
Ore tonnes mined, LOM 20,827 kt *
Tonnes processed, LOM 20.8 Mt *
Annual processing capacity 2.4 Mt *
Annual mining rate 2.4 Mt of ore *
* According to 2019 study.

Reserves at June 26, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Probable In-Situ (OP) 0.48 Mt Copper 1.5 % 7 kt
Probable In-Situ (UG) 13.14 Mt Copper 1 % 136 kt
Probable Total 13.62 Mt Copper 1.1 % 143 kt
Probable In-Situ (OP) 0.48 Mt Zinc 3.3 % 16 kt
Probable In-Situ (UG) 13.14 Mt Zinc 3.2 % 417 kt
Probable Total 13.62 Mt Zinc 3.2 % 433 kt
Probable In-Situ (OP) 0.48 Mt Copper Equivalent 2.2 % 11 kt
Probable In-Situ (UG) 13.14 Mt Copper Equivalent 2 % 257 kt
Probable Total 13.62 Mt Copper Equivalent 2 % 268 kt
Measured In-Situ (OP) 624,000 t Copper 1.54 % 10,000 t
Measured In-Situ (UG) 18,507,000 t Copper 1.17 % 217,000 t
Measured Total 19,131,000 t Copper 1.18 % 227,000 t
Measured In-Situ (OP) 624,000 t Zinc 3.05 % 19,000 t
Measured In-Situ (UG) 18,507,000 t Zinc 3.6 % 667,000 t
Measured Total 19,131,000 t Zinc 3.59 % 686,000 t
Inferred In-Situ (OP) 1,138,000 t Copper 1.4 % 17,000 t
Inferred In-Situ (UG) 10,219,000 t Copper 1.1 % 117,000 t
Inferred Total 11,357,000 t Copper 1.2 % 134,000 t
Inferred In-Situ (OP) 1,138,000 t Zinc 1.4 % 16,000 t
Inferred In-Situ (UG) 10,219,000 t Zinc 4.1 % 417,000 t
Inferred Total 11,357,000 t Zinc 3.8 % 433,000 t
Total Resource Total 30,488,000 t Copper 1.2 % 361,000 t
Total Resource Total 30,488,000 t Zinc 3.7 % 1,119,000 t

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (sold) Zinc Equivalent AUD  ......  Subscription required *
All-in sustaining costs (sold) Copper Equivalent AUD  ......  Subscription required *
Assumed price Zinc USD  ......  Subscription required *
Assumed price Copper USD  ......  Subscription required *
* According to 2019 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2019
Combined mining costs ($/t milled) AUD 48.1 *
Processing costs ($/t milled) AUD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M AUD  ......  Subscription required
Sustaining CapEx $M AUD  ......  Subscription required
OP/UG OpEx $M AUD  ......  Subscription required
Processing OpEx $M AUD 335.9
G&A costs $M AUD 138.5
Total OpEx $M AUD  ......  Subscription required
Income Taxes $M AUD  ......  Subscription required
Royalty payments $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
Net revenue (LOM) $M AUD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscription required
After-tax Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
After-tax NPV @ 8% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

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

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

News:

NewsDate
Orion Minerals secures a double-win May 9, 2022

Aerial view:

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