Overview

Mine Type	Underground
Status	Active
Commodities	Copper Gold Silver
Mining Method	Sub-level open stoping (SLOS)
Backfill type	...
Production Start	...
Mine Life	...
Snapshot	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.
Related Asset	Prominent Hill Operation

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

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Comminution

Crushers and Mills

Processing

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Production

Commodity	Units	2020	2019	2018	2017
Gold	koz	....	48	55	34
Silver	M oz	....	0.3	0.3	0.3

Operational metrics

Metrics	2022	2020	2019	2018	2017	2016	2015
Ore tonnes mined	....					2.1 Mt	1.9 Mt
Tonnes processed	....	....	2.7 Mt	2.8 Mt	2.1 Mt	2 Mt	1.6 Mt

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Oct 26, 2023
.......................	.......................		Oct 26, 2023
.......................	.......................		Oct 26, 2023
.......................	.......................		Oct 26, 2023