The deepest mines on Earth are engineering marvels that push the limits of human endurance, rock mechanics, and ventilation technology. These mines — predominantly gold and platinum operations in South Africa — descend more than three kilometres below the surface, creating unique challenges as temperatures rise and rock bursts become a constant hazard.
This list ranks the ten deepest mines in the world by their maximum working depth. South Africa's Witwatersrand Basin dominates, hosting several of the world's deepest mines, but Canada, the United States, and Russia also feature among the deepest operations.
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Depth (m)
Depth (m)
Mponeng Gold Mine
4000 m
TauTona Gold Mine
3900 m
Driefontein Gold Mine
3400 m
Kloof Gold Mine
3350 m
Kidd Mine
3050 m
South Deep Gold Mine
2995 m
Kopanang Gold Mine
2900 m
Creighton Mine
2680 m
Sanford Underground Research Facility (Homestake Mine)
2438 m
Lucky Friday Mine
2300 m
The ranking
1
Mponeng Gold Mine
Mponeng Gold Mine in South Africa is the deepest mine in the world, reaching a depth of approximately 4,000 metres below the surface. Operated by Harmony Gold, the mine is located near Johannesburg in the Witwatersrand Basin. At these depths, rock temperatures reach 60°C, requiring a massive refrigeration plant that pumps chilled water and ice slurry through the mine to keep working conditions survivable. The mine produces roughly 250,000 ounces of gold per year.
Country: South AfricaCommodity: GoldOperator: Harmony GoldRock temperature: ~60°C
2
TauTona Gold Mine
TauTona (meaning "great lion" in Setswana) reaches a depth of 3,900 metres, ranking second among the world's deepest mines. Also located in the Witwatersrand Basin of South Africa, the mine was operated by AngloGold Ashanti and extends over 800 km of underground tunnels. The mine famously employed a sophisticated seismic monitoring system to predict and mitigate rock bursts at extreme depths.
Country: South AfricaCommodity: GoldOperator: AngloGold AshantiRock temperature: ~60°C
3
Driefontein Gold Mine
Driefontein Gold Mine in South Africa reaches a depth of 3,400 metres, making it the third-deepest mine in the world. Located in the West Wits Line of the Witwatersrand Basin, the mine has been in operation since 1952 and has produced over 100 million ounces of gold, making it one of the richest gold mines in history. It is now operated by Sibanye-Stillwater.
Country: South AfricaCommodity: GoldOperator: Sibanye-StillwaterRock temperature: ~55°C
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4
Kloof Gold Mine
Kloof Gold Mine in South Africa reaches a depth of 3,350 metres, ranking fourth globally. Also operated by Sibanye-Stillwater, the mine is located near Carletonville in the Witwatersrand Basin. Kloof is known for its high-grade ore and has implemented advanced mechanized mining methods to improve safety and productivity at extreme depths.
Country: South AfricaCommodity: GoldOperator: Sibanye-StillwaterRock temperature: ~55°C
5
Kidd Mine
Kidd Mine in Timmins, Ontario, Canada is the deepest mine in the Western Hemisphere and the fifth-deepest in the world at 3,050 metres. It is the world's deepest base-metal mine, producing copper, zinc, and silver. Operated by Glencore, the mine has been in operation since 1966 and is one of the few non-gold mines to appear on the list of deepest mines.
South Deep Gold Mine near Westonaria, South Africa reaches a depth of 2,995 metres. It is the largest gold mine in the world by mineral reserves, holding over 30 million ounces. Operated by Gold Fields, South Deep uses a mechanized mining method that is unique among deep-level South African gold mines, employing trackless mining equipment in a low-profile mining layout.
Country: South AfricaCommodity: GoldOperator: Gold FieldsRock temperature: ~50°C
7
Kopanang Gold Mine
Kopanang Gold Mine in South Africa reaches a depth of 2,900 metres. Located in the Vaal River region of the Witwatersrand Basin, the mine is operated by Harmony Gold. Kopanang was the first mine in South Africa to implement a fully automated tramming system, using remote-controlled locomotives to haul ore through the mine's extensive underground network.
Country: South AfricaCommodity: GoldOperator: Harmony GoldRock temperature: ~50°C
8
Creighton Mine
Creighton Mine in Sudbury, Ontario, Canada reaches a depth of 2,680 metres. Operated by Vale, it is one of the deepest nickel mines in the world. The mine has been in operation since 1901 and has produced over 100 million tonnes of ore. Creighton is also the site of the Sudbury Neutrino Observatory (SNOLAB), a world-class physics research facility located 2 km underground.
Sanford Underground Research Facility (Homestake Mine)
The former Homestake Gold Mine in Lead, South Dakota, reaches a depth of 2,438 metres. While mining operations ceased in 2002, the facility now houses the Sanford Underground Research Facility (SURF), a world-leading physics laboratory operated by the South Dakota Science and Technology Authority. The facility hosts experiments including dark matter detection and neutrino physics, taking advantage of the 1.5 km rock overburden to shield sensitive detectors.
Country: United StatesCommodity: Gold (former) / Physics researchOperator: South Dakota Science and Tech AuthorityRock temperature: ~30°C
10
Lucky Friday Mine
The Lucky Friday Mine in Mullan, Idaho, reaches a depth of 2,300 metres, making it the deepest lead-zinc-silver mine in the United States. Operated by Hecla Mining Company, the mine has been in continuous operation since 1942 and is one of the highest-grade silver producers in the world. In 2023, Hecla completed a deep shaft extension to access additional ore reserves below the existing workings.
Sanford Underground Research Facility (Homestake Mine)
United States
Gold (former) / Physics research
South Dakota Science and Tech Authority
~30°C
10
Lucky Friday Mine
United States
Silver, lead, zinc
Hecla Mining Company
~30°C
How we ranked this
Mines are ranked by their maximum working depth in metres below the surface, using data from mining company annual reports, official mine technical specifications, and published mining industry databases. The depth figure represents the deepest accessible working level, whether reached by shaft or decline. All mines listed are active operations as of mid-2026; depths are approximate and may vary slightly as operations advance. The ranking excludes mines that are permanently closed or flooded.
FAQ
What is the deepest mine in the world?
Mponeng Gold Mine in South Africa is the deepest active mine in the world, reaching approximately 4,000 metres (4 km) below the surface. The Witwatersrand Basin in South Africa dominates the list, hosting seven of the ten deepest mines on Earth.
Why are the deepest mines all in South Africa?
The Witwatersrand Basin in South Africa contains the world's deepest gold deposits, formed by ancient sedimentary processes over 2.7 billion years ago. The gold-bearing reefs dip steeply underground, forcing mines to follow them to extreme depths. South Africa's deep-level gold mining industry has developed specialized technologies and safety protocols for ultra-deep mining over more than a century of operation.
How do miners survive at 4 km underground?
At 4 km depth, natural rock temperatures exceed 60°C. Mines use massive refrigeration plants to pump chilled water and ice slurry through underground cooling systems, reducing ambient temperatures to around 30°C. Miners work in shifts of limited duration, wear specialized cooling garments, and have access to refuge bays with emergency supplies. Air circulation is carefully managed to maintain breathable conditions.