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Australia
Malu (OP) 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
Phone  ...  Subscription required
Fax(61-8)-8229-6601
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life2018
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 Prominent Hill processing plant can process approximately ten million tonnes per annum subject to the ore blend. The current life of mine schedule has the plant running at that capacity until the end of 2019 when open pit copper ore stocks are depleted. From then until early 2024, throughput will be approximately eight to nine million tonnes per annum with a high proportion of stockpiled open pit gold ore. On exhaustion of gold ore stocks the plant will be fed with underground ore alone.


Owners & OPERATOR

Source: p. 161
CompanyInterestOwnership
Thiess Pty Ltd. (operator)
OZ Minerals Ltd. 100 % Indirect
OZ Minerals Prominent Hill Operations Pty Ltd. 100 % Direct
OZ Minerals Prominent Hill Operations Pty Ltd is a wholly owned subsidiary Oz Minerals Ltd.

Deposit Type

  • Breccia pipe / Stockwork
  • IOCG


Summary:

The Prominent Hill iron-oxide copper gold (IOCG) deposit is located in the north-eastern portion of the Archaean to Mesoproterozoic Gawler Craton, South Australia. Most of these deposits are thought to be genetically related to the Gawler Range Volcanic (GRV) – Hiltaba magmatic event which affected the central and eastern portions of the Gawler Craton around 1600-1580 million years ago. Copper-gold-silver mineralisation at Prominent Hill is mostly hosted within hematite-matrix 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.

The current maximum extent of the reported Mineral Resource is 2,700m (east-west) by 1,300m (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 123m and 1,399m respectively below the pre-mining topographic surface.


Mining Methods

  • Truck & Shovel / Loader


Summary:

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.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The Prominent Hill processing plant has been operating since February 2009 and comprises a conventional crushing, grinding and flotation circuit to recover copper, gold and silver to produce a high-quality concentrate. The plant can process approximately ten million tonnes per annum subject to the ore blend. The current life of mine schedule has the plant running at that capacity until the end of 2019 when open pit copper ore stocks are depleted.

From then until early 2024, throughput will be approximately eight to nine million tonnes per annum with a high proportion of stockpiled open pit gold ore. On exhaustion of gold ore stocks the plant will be fed with underground ore alone.

Optimisation studies indicate that the plant can be configured to run at four to six million tonnes per annum dependent on the blend of copper and gold ores for minimal capital expenditure. If necessary, lower throughputs can be processed in batches providing the ability to process ore a ........

Recoveries & Grades:

CommodityParameter201920182017
Copper Head Grade, % 11.21.1
Gold Head Grade, g/t 0.60.50.5
Silver Head Grade, g/t 33.23.4

Production:

CommodityUnits201920182017
Copper kt  ......  Subscription required  ......  Subscription required83
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver M oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required8.8 Mt8.8 Mt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required15.1 Mt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required1 3.1
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 23 Mt Copper 0.3 % 65 kt
Proven 23 Mt Gold 0.6 g/t 470 koz
Proven 23 Mt Silver 2 g/t 2 M oz
Proven 23 Mt Copper Equivalent 0.6 %
Measured 23 Mt Copper 0.3 % 65 kt
Measured 23 Mt Gold 0.6 g/t 470 koz
Measured 23 Mt Silver 2 g/t 2 M oz
Measured 23 Mt Copper Equivalent 0.6 %

Operating Costs:

Units20162015
OP mining costs ($/t mined) AUD 6.25.7
OP mining costs ($/t milled) AUD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.


Heavy Mobile Equipment:

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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
Year-end Mineral Reserves 2017
Annual Report 2016
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Aerial view:

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