Olympic Dam Mine, South Australia: Copper and Uranium

Reference article · Updated 2026-11-06

Key facts

Olympic Dam is a single polymetallic orebody mined underground; uranium is recovered as a co-product, not the primary target.
The World Nuclear Association reports 2,693 tU from Olympic Dam in 2024, about 5% of world production.
BHP reported 3.2 kt of uranium (as U3O8) for its 2025 financial year, down from 3.6 kt in 2024, citing a weather-related power outage.
A large open-pit expansion approved in 2011 was dropped in 2016 in favour of underground development.

A copper mine that is also a major uranium source

Olympic Dam lies in the arid Roxby Downs region of South Australia, roughly 560 km north of Adelaide. The deposit lies deep under cover rocks and is mined underground. Operations began in 1988 as a joint venture of Western Mining Corporation and BP Minerals; BHP took over in 2005 after acquiring WMC Resources. The mine produces copper cathode, gold and silver bullion and uranium oxide concentrate, according to BHP's annual filings.

Because uranium is a by-product of a copper operation, its output follows copper-mine plans, ore grades and plant performance more than the uranium price. This is why Olympic Dam is treated separately from conventional uranium mines in production statistics, and why its uranium supply is relatively inelastic.

The deposit: an iron oxide copper-gold system

Olympic Dam is the type example of the iron oxide copper-gold (IOCG) class, with copper, uranium, gold and silver in a large breccia complex. The World Nuclear Association describes it as the largest known uranium orebody in the world by contained metal, though the grade of the ore is low. Resource tonnages are large relative to production, which is why the mine's life is determined by copper economics and infrastructure, not by lack of ore. For how resource categories are defined and why large low-grade resources differ from reserves, see uranium resources and reserves.

Processing: how uranium is recovered alongside copper

Ore is crushed and ground, and copper minerals are recovered by flotation. According to the World Nuclear Association, about 80% of the uranium is recovered by acid leaching of the flotation tailings, and most of the remainder comes from acid leaching of the copper concentrate, which still carries a small amount of uranium. Because the concentrate carries uranium, copper is smelted and refined on site, which allows the uranium to be removed before copper metal is produced.

The leach solution is purified and the uranium precipitated as uranium oxide concentrate for export. The general milling chemistry is explained on the fuel production chain page. Uranium exports from Australia are subject to safeguards agreements with the buying countries.

Production history

Uranium output began at about 1,300 tonnes a year in 1988. After a major expansion, output exceeded 4,000 tonnes a year by mid-2001, and annual capacity was later expanded to 4,600 t U₃O₈. World Nuclear Association data list recent annual output of 3,728 t (2015), 3,967 t (2019), 3,611 t (2020), 1,922 t (2021) and 3,317 t (2022), all expressed as U₃O₈. The 2021 dip is a reminder that a smelter or maintenance shutdown at a copper mine can reduce uranium output sharply.

BHP's operational reviews give uranium output of 3.6 kt in its 2024 financial year and 3.2 kt in 2025; BHP attributed the 2025 decline to a significant weather-related power outage in the second quarter. BHP's reporting year runs to 30 June, so its figures do not match calendar-year statistics such as the WNA's 2,693 tU for 2024 (which is equal to roughly 3,200 t U₃O₈).

Why Olympic Dam matters for uranium supply and for analysis

In 2024 Olympic Dam was the seventh-largest uranium source in the world, at about 5% of output, according to the World Nuclear Association's ranking of mines. Its by-product status has three consequences for analysts. First, supply is driven by copper-plant availability, so planned smelter or refinery work reduces uranium in the same period. Second, because the uranium is produced regardless of the uranium price, it is a source of supply that does not respond quickly to market signals; the market context is discussed on uranium production and demand. Third, cost allocation is a matter of accounting choices: because uranium shares costs with copper, gold and silver, a stand-alone uranium production cost is not meaningful.

For the same reason the World Nuclear Association reports Olympic Dam separately when it splits production by method, treating conventional mines apart from it. Readers comparing national statistics should check whether a figure includes by-product output and whether it is stated in tU or in U₃O₈.

Expansion proposals and what happened to them

In 2009 BHP released an environmental impact statement for a very large open-pit expansion. State and federal governments approved the project in October 2011, with a plan to reach about 19,000 t U₃O₈ a year. In August 2012 BHP said it would investigate a cheaper design, and the state later granted a four-year extension for a work programme. In 2016 BHP confirmed it would focus only on underground development and drop the open-pit plan. A further planned expansion was cancelled in October 2022, according to the World Nuclear Association. BHP has since discussed investments in the existing smelter and supporting infrastructure; timing and scope have changed several times and should be checked against current BHP statements.

Regulation, water and tailings

Olympic Dam operates under a special state law, the Roxby Downs (Indenture) Ratification Act 1982, as amended. Commentary on the act, including parliamentary debate, notes that it provides exemptions from parts of other South Australian legislation; the extent and effect of these exemptions have been debated, and readers should consult the legislation and current government guidance. Projects of this scale have also required assessment under Australian federal environmental law, as the 2011 expansion did.

Two issues recur in public discussion. The first is water: the mine draws groundwater from the Great Artesian Basin under a special licence, and the effect on mound springs has been a long-running concern. The second is tailings management: the acid-leached tailings contain radionuclides and metals and are kept in engineered storage facilities on the lease. General principles are described in uranium mill tailings, and the wider framework in regulation of uranium mining. This page does not quote water volumes or tailings quantities because the available figures were not from current primary reports.

Olympic Dam among Australian uranium operations

Australia's other uranium mines use in-situ leach. The Beverley mine began in 2000 and stopped mining at the end of 2013; the nearby Four Mile mine, owned by Quasar Resources, began ISL mining in 2014 and uses the Beverley processing plant; and the Honeymoon mine was approved for restart by Boss Energy in June 2022. Australian production in 2024 was about 4,600 tU in total, according to WNA data, so Olympic Dam supplied a little over half. See ISL explained for the method.

Frequently asked questions

Is Olympic Dam a uranium mine or a copper mine?

Primarily a copper mine. Uranium, gold and silver are co-products from the same orebody, and uranium output depends on the copper operation.

How much uranium does Olympic Dam produce?

The World Nuclear Association reports 2,693 tU in 2024, about 5% of world production. BHP reported 3.2 kt of uranium oxide for its 2025 financial year.

Who owns and operates Olympic Dam?

BHP, which acquired it through the 2005 takeover of WMC Resources. It was originally developed by a joint venture of WMC and BP Minerals, starting production in 1988.

Was the open-pit expansion built?

No. It was approved in 2011, but in 2016 BHP confirmed it would drop the open-pit plan and focus on underground development.

How does Olympic Dam get its uranium out of the rock?

Copper minerals are removed by flotation, then acid leaching extracts uranium from the flotation tailings and from the copper concentrate, and the dissolved uranium is processed to an oxide concentrate.