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Australia
Prominent Hill Operation (Ankata/Malu (UG) Mine, Malu (OP) Mine)

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 Location:
111 km SE from Coober Pedy, South Australia, Australia

  Address:
2 Hamra Drive Adelaide Airport
PO Box 248 Adelaide Airport
Adelaide
South Australia, Australia
5950
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Sub-level open stoping (SLOS)
  • Cemented backfill
Production Start...
Mine Life2038
Construction of the Wira Shaft is underway, and this brownfield expansion will extend Prominent Hill’s life of mine to 2038. As part of project optimisation works done in 2022, this electric hoisting shaft’s capacity was increased from 6Mtpa to 6.5Mtpa. The increased capacity will provide us with optionality to increase Prominent Hill’s annual production rates.

The shaft headframe is planned for installation in the first half of 2023.


Owners

Source:
CompanyInterestOwnershipInvestor's Info
BHP Group Ltd. 100 % Indirect
OZ Minerals Ltd. indirectly owns 100% interest in the Prominent Hill operation through its wholly owned subsidiary OZ Minerals Prominent Hill Operations Pty Ltd.

On May 2, 2023, BHP announced the completion of the OZ Minerals acquisition and implementation of the scheme of arrangement for BHP Lonsdale Investments Pty Limited, a wholly owned subsidiary of BHP Group Limited, to acquire 100% of the shares in OZ Minerals Limited (OZL) (the Scheme). BHP Group Limited is now the ultimate parent company of OZL.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • IOCG


Summary:

The Prominent Hill iron oxide copper gold (IOCG) deposit is located in the northeastern portion of the Archaean to Mesoproterozoic Gawler Craton, South Australia. Copper-gold-silver mineralisation at Prominent Hill is mostly hosted within hematitematrix breccia containing fragments of sandstone, siltstone, dolostone, and mafic to intermediate volcanic rocks. Copper mineralisation occurs as disseminations of chalcocite, bornite and chalcopyrite in the matrix of the breccia.

Mineralisation generally has a tabular geometry. Most but not all copper mineralisation is hosted in hematite breccia. Gold mineralisation is commonly coincident with copper mineralisation, but some zones of gold-only mineralisation do exist. Copper grades generally show better spatial continuity within hematite breccia than within other rock types. Barren dykes cross cut the mineralisation. Barren covering sediments overlie the mineralised basement rocks.

The current maximum extent of the reported Mineral Resource is 2,600m (east-west) by 1,400m (vertical). Multiple lenses exist within a mineralised zone having a plan width (across strike) of approximately 300-400m. Only a subset of this mineralised zone has sufficient continuity of grade to have been reported as a Mineral Resource. The upper and lower limits of the reported Mineral Resource are 100m and 1,462m respectively below the pre-mining topographic surface.


Mining Methods

  • Sub-level open stoping (SLOS)
  • Cemented backfill


Summary:

Prominent Hill is a copper, gold and silver mine located 650 km northwest of Adelaide in South Australia and comprise:
-Open pit mine (Malu) - which concluded operations in Q1 2018;
-Surface ore stockpiles - being in operation since Q2 2018;
-Underground mine (Ankata and Malu mine areas);
-Conventional crushing, grinding and flotation Processing Plant.

Surface operations to rehandle stockpiles are carried out by mining contractor.

The Prominent Hill Underground Mineral Resource is being mined successfully using sub-level open stoping (SLOS) with cemented fill. Access to the ore body and ore haulage is carried out via decline (ramp) system. Operations are performed by mining contractor.

On August 18, 2021, The OZ Minerals Board approved construction of a hoisting shaft at the Prominent Hill copper-gold mine in South Australia, paving the way for a mine life extension and throughput expansion.

Sinking of the shaft is expected to commence in the March quarter of 2022. Mining and installation of underground and surface infrastructure is scheduled for completion along with commissioning of the Wira shaft at the end of 2024, with nameplate capacity expected in H1 2025.

OZ Minerals announced the decision to increase the hoisting shaft capacity under construction at Prominent Hill from 6Mtpa to 6.5Mtpa. The Wira Shaft mine expansion project was approved in August 2021 with works well progressed and scheduled ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2023202220212020201920182017
Copper Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required110,111112,008
Gold Metal in concentrate oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required260
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,365,932 t5,132,570 t16,963,931 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required9,807,885 t9,830,063 t
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required4,317,376 t6,575,586 t25,272,373 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required951,444 t1,443,016 t
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required10 Mt
^ Guidance / Forecast.
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Reserves at June 30, 2022:
The A$48/t Net Smelter Return (NSR) cut-off for the Prominent Hill Underground Mineral Resource.

Prominent Hill Underground Reserve cut-off value: Ankata orebody were designed to a $65 NSR shell, the Malu orebody were designed to a $75 NSR shell and Kalaya and Malu Deeps West to a $70 NSR shell.

Stockpile cut-off is $17/t NSR which covers rehandle and processing costs.

CategoryTonnage CommodityGradeContained Metal
Proven 29 Mt Copper 1.2 % 340 kt
Proven 29 Mt Gold 0.6 g/t 530 koz
Proven 29 Mt Silver 2.9 g/t 2.7 M oz
Proven 29 Mt Copper Equivalent 1.5 %
Probable 39 Mt Copper 0.7 % 270 kt
Probable 39 Mt Gold 0.7 g/t 850 koz
Probable 39 Mt Silver 1.9 g/t 2.4 M oz
Probable 39 Mt Copper Equivalent 1.1 %
Proven & Probable 68 Mt Copper 0.9 % 610 kt
Proven & Probable 68 Mt Gold 0.6 g/t 1,400 koz
Proven & Probable 68 Mt Silver 2.3 g/t 5.1 M oz
Proven & Probable 68 Mt Copper Equivalent 1.3 %
Measured 49 Mt Copper 1.2 % 590 kt
Measured 49 Mt Gold 0.6 g/t 940 koz
Measured 49 Mt Silver 3 g/t 4.7 M oz
Measured 49 Mt Copper Equivalent 1.6 %
Indicated 60 Mt Copper 0.7 % 450 kt
Indicated 60 Mt Gold 0.8 g/t 1,600 koz
Indicated 60 Mt Silver 2.2 g/t 4.2 M oz
Indicated 60 Mt Copper Equivalent 1.3 %
Inferred 66 Mt Copper 0.8 % 560 kt
Inferred 66 Mt Gold 0.9 g/t 1,900 koz
Inferred 66 Mt Silver 2.3 g/t 4.8 M oz
Inferred 66 Mt Copper Equivalent 1.4 %
Total Resource 180 Mt Copper 0.9 % 1,600 kt
Total Resource 180 Mt Gold 0.8 g/t 4,500 koz
Total Resource 180 Mt Silver 2.4 g/t 14 M oz
Total Resource 180 Mt Copper Equivalent 1.4 %

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.71 / lb  
Total cash costs Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.95 / lb†  
All-in sustaining costs (AISC) Copper USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1.14 / lb†   1.2 / lb†  
C1 cash costs Copper USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.73 / lb†   0.83 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M AUD  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 77.4   53.6  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,066   1,023  
EBIT M AUD 367.4  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 618.2   583.1  
Subscription required - Subscription is required


Pipelines and Water Supply
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Press Release 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... 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
Annual Report 2018
Corporate Presentation 2018
Press Release 2018
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Corporate Presentation 2017
Environmental Impact Statement 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Corporate Presentation 2016
Other 2009
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