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

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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
Latest NewsBHP and OZL enter into scheme implementation deed     December 22, 2022


Owners

Source: p. 14
CompanyInterestOwnership
OZ Minerals Ltd. 100 % Indirect
OZ Minerals Prominent Hill Operations Pty Ltd is a wholly owned subsidiary Oz Minerals 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:

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 fleet going from circa-14 to five, post-shaft.

Prominent Hill is an operating mine and has the majority of necessary infrastructure in place for its continued operation.

Two new primary ventilation fans were commissioned in Q2 2020. This is the third pair of primary ventilation fans installed at Prominent Hill.

A second paste fill plant was successfully commissioned in mid-2020 and is capable of providing cemented fill at a rate to suppor ........


Crushing and Grinding
Flow Sheet: Source

Crushing and Grinding
Ore is hauled from the mine directly to the primary crusher or stockpiled on the ROM pad until such time as it can be processed. Mineralised waste is stockpiled separately to allow for future reprocessing should this be determined to be economically viable.

The ore is taken from the mine or reclaimed from the ROM stockpiles and tipped into the primary crusher, located adjacent to the ROM pad, where it is crushed to a size of less than 125 mm. The nominal crusher throughput is up to 3,600 tonnes per hour, approximately three times the throughput of the grinding circuit. The ore is then conveyed to the crushed ore stockpile. It is reclaimed from the bottom of the stockpile and conveyed to the semi-autogenous grinding (SAG) mill which operates in a closed circuit with a vibrating screen and pebble recycle circuit. Grinding balls at 125 mm are added including water inside the SAG mill to reduce the ore to micron size contained in a slurry form. Material that doesn’t pass through the 5 x 20 mm screen is recycled back to the SAG mill for further grinding. The slurry containing the fine material that passes through the 5 x 20 mm screen is combined along with the ball mill discharge to slurry feed the primary hydrocylone pack for classification. The primary hydrocyclone separates the material by size, where the overflow fines report to flotation, and the underflow coarse returns to the ball mill where 60 mm balls are added for further grinding. The SAG and ball mill operates in closed circuit with the primary hydrocyclone pack. Dust generation occurs during the dry stages of crushing and when transporting ore to the coarse ore stockpile (COS). Water sprays are used in the crusher pocket and at the discharge of the first conveyor (CV1) to manage the dust. The rest of the size reduction process (grinding) is a wet process where no dust is generated.

The SAG/ball milling circuit enables 80% of the material is sized to less than 125 µm, and becomes suitable for further processing.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2020201920182017
Copper kt  ......  Subscription required  ......  Subscription required5145
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver M oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes processed  ......  Subscription required2.7 Mt2.8 Mt2.1 Mt2 Mt1.6 Mt
Ore tonnes mined  ......  Subscription required2.1 Mt1.9 Mt
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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 25 Mt Copper 1.3 % 320 kt
Proven 25 Mt Gold 0.6 g/t 490 koz
Proven 25 Mt Silver 3.2 g/t 2.6 M oz
Proven 25 Mt Copper Equivalent 1.7 %
Probable 24 Mt Copper 1 % 240 kt
Probable 24 Mt Gold 0.7 g/t 570 koz
Probable 24 Mt Silver 2.8 g/t 2.1 M oz
Probable 24 Mt Copper Equivalent 1.5 %
Proven & Probable 48 Mt Copper 1.2 % 560 kt
Proven & Probable 48 Mt Gold 0.7 g/t 1,100 koz
Proven & Probable 48 Mt Silver 3 g/t 4.7 M oz
Proven & Probable 48 Mt Copper Equivalent 1.6 %
Measured 42 Mt Copper 1.3 % 520 kt
Measured 42 Mt Gold 0.6 g/t 830 koz
Measured 42 Mt Silver 3.2 g/t 4.3 M oz
Measured 42 Mt Copper Equivalent 1.6 %
Indicated 44 Mt Copper 0.9 % 420 kt
Indicated 44 Mt Gold 0.9 g/t 1,200 koz
Indicated 44 Mt Silver 2.7 g/t 3.9 M oz
Indicated 44 Mt Copper Equivalent 1.5 %
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 140 Mt Copper 1 % 1,400 kt
Total Resource 140 Mt Gold 0.8 g/t 3,600 koz
Total Resource 140 Mt Silver 2.7 g/t 12 M oz
Total Resource 140 Mt Copper Equivalent 1.5 %

Operating Costs:

Units2016
UG mining costs ($/t mined) AUD 53


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelQuantityLeased or
Contractor
Cable bolter ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Explosives Charger ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Truck (underground) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

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 10, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Year-end Mineral Reserves 2018
Environmental Impact Statement 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Year-end Mineral Reserves 2015
Corporate Presentation 2014
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News:

NewsDate
BHP and OZL enter into scheme implementation deed December 22, 2022

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