Key facts
- Uranium recovery began in the early 1950s as a by-product of Witwatersrand gold, and output peaked near 6,000 t/yr in 1960 according to the World Nuclear Association.
- South African production has fallen to about 200 tU a year in 2022, 2023 and 2024, mostly from Harmony's Moab Khotsong.
- Around 400 gold-mining tailings dams and dumps in the Witwatersrand area hold much of the remaining uranium.
- The National Nuclear Regulator, created by the National Nuclear Regulator Act of 1999, covers the fuel cycle from mining to waste disposal.
- Acid mine drainage in the Witwatersrand basin has carried uranium and heavy metals into streams and sediments.
Why uranium and gold share the same rock
The Witwatersrand Basin is best known for gold, but the same quartz-pebble conglomerate reefs carry detrital uraninite and other uranium minerals. Because the ore was already being mined, treated and sent to tailings for gold, recovering uranium from the slurry was an add-on rather than a separate mining operation. That is why South African uranium is described as a by-product: its output depends on gold production decisions as much as on the uranium market.
The World Nuclear Association (WNA) reports that a company was formed in 1951 to extract uranium from gold-mining slurries, and that the Nuclear Fuels Corporation of South Africa (Nufcor) took over this work in 1967. Nufcor passed to AngloGold in 1998 and to Harmony Gold Mining in 2018. Over nearly 30 years to 1980 the operation produced about 100,000 tonnes of uranium oxide, with output peaking at almost 6,000 t/yr in 1960.
The by-product model matters for the world picture. It is a reminder that some uranium supply is tied to other commodities; compare Australia's Olympic Dam copper-uranium mine, and see uranium by country for how supply types differ.
A shrinking production record
WNA figures show how far output has fallen from its mid-twentieth-century level.
| Year | Production (tU) |
|---|---|
| 2011 | 582 |
| 2014 | 573 |
| 2017 | 308 |
| 2020 | 250 |
| 2022, 2023, 2024 | 200 each year |
The WNA notes that the Ezulwini-Cooke operation produced nothing after 2016 and that Moab Khotsong, run by Harmony since 2018, is now South Africa's only significant uranium producer. Because the gold sector has been contracting, uranium output has followed. Much of the former deep-level uranium capacity is idle, and expansion would require both gold-price and uranium-price signals.
Tailings: both a resource and a legacy
About 400 tailings dams and dumps from gold mining sit in the Witwatersrand area, and much of the remaining uranium in the system lies in them. Many are being reprocessed, usually for gold and sometimes uranium. The WNA reports that Mine Waste Solutions held about 21,000 tU in proven and probable reserves in old tailings, and that the West Rand Tailings Retreatment Project had a resource of 38,190 tU at a very low grade of 0.0054% U at the end of 2015. In 2018 the West Rand project was sold to DRDGOLD, which processes its tailings for gold only.
The scale of this waste is also an environmental issue. Reprocessing can remove tailings from populated areas and reduce dust and seepage, but it does not remove every hazard, and each project needs its own authorisation. For how tailings behave in general, see uranium mill tailings. A 2015 paper by Frank Winde (North-West University) states that the Witwatersrand goldfields contain more uraniferous mine waste than all other uranium-producing countries combined; this is one researcher's assessment rather than an official inventory.
Karoo and other undeveloped deposits
South Africa's best-known stand-alone uranium prospects lie in the Karoo Basin. The WNA reports that Peninsula Energy had a JORC-compliant resource of 21,930 tU at the Karoo project, including 8,440 tU of indicated resource at 0.089% U. The Ryst Kuil deposit was discovered by Esso in the 1970s, held later by Areva, suspended by Areva in late 2011 and acquired by Peninsula in April 2014. Peninsula withdrew in April 2018 to concentrate on its Lance project in the United States.
Other resource figures cited by the WNA include AngloGold's by-product resources of 130,560 t U3O8 at the end of 2015, of which 53,700 t were reserves, and Beisa (Beatrix) with 9,900 tU at 0.079% U as of December 2013. These are company-reported historic estimates and do not by themselves indicate production plans. No new stand-alone Karoo mine is confirmed as under construction in the sources consulted.
What would be needed for new South African supply
Three conditions would have to be met for South African uranium output to grow materially. First, tailings projects need an economic gold or other metal credit, because the uranium grade in retreatment resources such as the West Rand project (0.0054% U) is far too low to support processing alone. Second, deep-level by-product recovery depends on the operating future of the gold mines that host it, which is uncertain. Third, a stand-alone Karoo mine would require a full environmental and nuclear authorisation, with water use in a dry region a likely focus.
Readers comparing countries may find it useful to look at uranium by country alongside this page; estimates of resources are not equivalent to reserves, as explained in resources and reserves.
Who regulates uranium work in South Africa
The National Nuclear Regulator Act of 1999 established the National Nuclear Regulator (NNR), whose remit the WNA describes as covering the full fuel cycle from mining to waste disposal. The NNR oversees the siting, design, construction, operation and decommissioning of nuclear installations and the radiological protection of people and the environment. Mining and water-related matters involve other departments, including those for mineral resources and for water and sanitation, so responsibility for a single gold-uranium site is often shared.
This overlap is one reason legacy sites are difficult to manage. For comparison with other regimes, see regulation of uranium mining and tailings.
Acid mine drainage and uranium in water
When deep gold mines stop pumping, groundwater rises through the old workings, reacts with pyrite and decants as acidic, sulfate-rich water. In the Witwatersrand, the Western Basin was the first area where this decant reached the surface, in August 2002, and a 2011 ministerial directive led to emergency works including water-treatment plants. Treated water has been discharged to local streams.
Studies of the Wonderfonteinspruit catchment found sediment contaminated with uranium and other heavy metals from mine wastewater, and research suggests that downstream wetlands can concentrate uranium-series radionuclides. Dolomite in the area helps to neutralise acidity, but neutralisation alone does not remove sulfate. The chemistry of uranium transport is described in uranium chemistry and mobility.
Current plant performance and radionuclide levels change over time and were not verified for this page; the government and parliamentary records cited below date from 2010 to 2012.
Frequently asked questions
Is South Africa a major uranium producer?
Not any more. The World Nuclear Association reports about 200 tU a year in 2022, 2023 and 2024, compared with almost 6,000 t/yr of uranium oxide at the 1960 peak.
Why is South African uranium called a by-product?
It has mostly been recovered from Witwatersrand gold ore and slurries rather than from mines developed for uranium alone.
Which mine produces most South African uranium today?
Harmony's Moab Khotsong, which the World Nuclear Association describes as the only significant uranium producer.
Who regulates uranium activities?
The National Nuclear Regulator, established by the National Nuclear Regulator Act of 1999, covers the fuel cycle from mining to waste disposal, alongside other departments responsible for minerals and water.
What are the Karoo uranium projects?
They are undeveloped deposits such as Ryst Kuil, where Peninsula Energy reported a 21,930 tU resource before withdrawing in 2018. None is confirmed under construction.
Sources and further reading
- World Nuclear Association — Uranium and Nuclear Power in South Africa (uranium section) (2026)
- Inter-Ministerial Committee on Acid Mine Drainage (Council for Geoscience-coordinated expert team), South Africa — Mine Water Management in the Witwatersrand Gold Fields with Special Emphasis on Acid Mine Drainage (2010)
- Parliamentary Monitoring Group, South Africa — Acid Mine Drainage: hearings (day 1) (2012)
- Parliamentary Monitoring Group, South Africa — Acid Mine Drainage, Witwatersrand: Department of Water Affairs update (2012)
- North-West University (F. Winde) — Uranium pollution in South Africa: past research and future needs (2015)
- World Nuclear Association — World Uranium Mining Production (2025)
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