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Mining People Magazine

The mine life of Oz Minerals’ Prominent Hill copper-gold

operation in South Australia has been extended until 2030

following a 50 percent increase to underground Proved


The two percent increase in underground ore reserves after

mining depletion has extended the Prominent Hill mine life by

a year, enabling the expected underground production rate of

3.5-4.0Mtpa from 2019 to continue into 2030.

Underground ore reserve tonnes and contained metal at

Prominent Hill remain in line with the previous year, with open pit

and underground mining depletion partially offset by increases

in underground ore reserves. Improved geological confidence

from diamond drilling activity through the year resulted in proved

underground ore reserves increasing by 50 percent to 28Mt.

Oz Minerals Managing Director and CEO

Andrew Cole (l) said the increase in

underground proved reserves materially

increased confidence in the Prominent Hill

ore body and further de-risked Life of Mine






demonstrated the ability to extend

mine life through conversion of its

extensive resource base, whilst reliably delivering

production and costs to guidance,” he said.

“With an estimated 80Mt of underground mineral

resource outside of the ore reserve, we will continue

our drilling program to convert more material in

reserves with the aim of extending mine life year to


Prominent Hill first came on stream in 2009 and now

produces over 100,000 tonnes of copper every year.

The open pit aspect of the operation concluded in the

first quarter of 2018.

Prominent Hill sunset in Outback South Australia.

Oz Minerals Extends

Prominent Hill Mine Life

Estimate to 2030

The Fremantle Doctor prospect is also in South Australia,

adjacent to Oz Minerals Carrapateena copper-gold project

160km north of Port Augusta.

An initial estimated Inferred Resource of 104Mt @ 0.7 per

cent copper and 0.5g/t gold has been released for Fremantle

Doctor. The resource lies just over 2km from the Carrapateena

ore body and will be considered in the broader Carrapateena

life of province planning and expansion studies as an adjunct

development to the Carrapateena project.

“This provides another valuable input into our life of province

planning and will help inform our expansion studies that are

currently in progress,” Cole said.

“In addition to releasing an updated Carrapateena Mineral

Resource estimate in Q1 2019, we are working on updated

resource statements for West Musgrave, Antas, Pedra Branca

and CentroGold, and an initial resource statement for Pantera.

“These will be progressively released through 2019 and build

on the consolidated OZ Minerals position.”

Underground at Prominent Hill.

by Andrew Spence