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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

  Regional Office:
2 Hamra Drive Adelaide Airport
PO Box 248 Adelaide Airport
Adelaide
South Australia, Australia
5950
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Fax(61-8)-8229-6601
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Sub-level stoping
  • Cemented backfill
Production Start...
Mine Life2036
The Prominent Hill Open Pit Mineral Resource was fully depleted, with the Open Pit mining operations completed in March 2018. Open pit ore stockpiled in previous periods began to be processed from Quarter 2 2018 following the closure of the Prominent Hill Open Pit.

The Wira Shaft mine expansion project was approved in August 2021 with works well progressed and scheduled for completion in 2024. On 4 April 2022, OZ Minerals announced the decision to increase the hoisting shaft capacity under construction at Prominent Hill from 6Mtpa to 6.5Mtpa.


Owners

Source: p. 14
CompanyInterestOwnership
OZ Minerals 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.

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 105m and 1,461m respectively below the pre-mining topographic surface.


Mining Methods

  • Sub-level stoping
  • 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.

The shaft design comprises a 1,329 metre deep, concrete lined shaft with a diameter of 7.5 metres.

The company plans to reduce its underground loading fleet to eight vehicles, from nine after the shaft expansion, with its trucking ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2022202120202019201820172016
Copper Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required110,111112,008116,882
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 required260
Silver Metal in concentrate oz  ......  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
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
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required9,807,885 t9,830,063 t
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required10 Mt
^ Guidance / Forecast.
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Reserves at June 30, 2021:
The A$49/t Net Smelter Return (NSR) cut-off for the Prominent Hill Underground Mineral Resource

CategoryTonnage CommodityGradeContained Metal
Proven 27 Mt Copper 1.2 % 330 kt
Proven 27 Mt Gold 0.6 g/t 510 koz
Proven 27 Mt Silver 3.1 g/t 2.7 M oz
Proven 27 Mt Copper Equivalent 1.6 %
Probable 35 Mt Copper 0.7 % 250 kt
Probable 35 Mt Gold 0.7 g/t 780 koz
Probable 35 Mt Silver 2 g/t 2.3 M oz
Probable 35 Mt Copper Equivalent 1.1 %
Proven & Probable 62 Mt Copper 0.9 % 590 kt
Proven & Probable 62 Mt Gold 0.6 g/t 1,300 koz
Proven & Probable 62 Mt Silver 2.5 g/t 5 M oz
Proven & Probable 62 Mt Copper Equivalent 1.3 %
Measured 44 Mt Copper 1.2 % 540 kt
Measured 44 Mt Gold 0.6 g/t 860 koz
Measured 44 Mt Silver 3.1 g/t 4.4 M oz
Measured 44 Mt Copper Equivalent 1.6 %
Indicated 56 Mt Copper 0.8 % 430 kt
Indicated 56 Mt Gold 0.8 g/t 1,500 koz
Indicated 56 Mt Silver 2.2 g/t 4.1 M oz
Indicated 56 Mt Copper Equivalent 1.3 %
Inferred 51 Mt Copper 0.8 % 430 kt
Inferred 51 Mt Gold 0.9 g/t 1,500 koz
Inferred 51 Mt Silver 2.3 g/t 3.7 M oz
Inferred 51 Mt Copper Equivalent 1.4 %
Total Resource 150 Mt Copper 0.9 % 1,400 kt
Total Resource 150 Mt Gold 0.8 g/t 3,800 koz
Total Resource 150 Mt Silver 2.5 g/t 12 M oz
Total Resource 150 Mt Copper Equivalent 1.4 %

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Credits (by-product) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.71 / lb  
Total cash costs Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.95 / lb†  
All-in sustaining costs (AISC) Copper USD  ......  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† 0.73 / lb†   0.83 / lb†   0.74 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M AUD  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 77.4   53.6   125.4  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,066   1,023   822.9  
EBIT M AUD 367.4   214.5  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 618.2   583.1   418.2  
Subscription required - Subscription is required



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 10, 2022
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
Press Release 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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