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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