World's Deepest Gold Mines: Kolar vs. Arizona vs. The Record Holders

The question "Is the deepest gold mine in Karnataka Kolar or Arizona?" contains a false premise: neither is the deepest. The deepest gold mine in the world is in South Africa, and the deepest in the United States is in South Dakota, not Arizona.

The Global Record Holder

Mponeng Gold Mine (South Africa) – Operated by Harmony Gold. Current operating depth: ~4,000 meters (13,123 ft). It is the world's deepest mine (any mineral).

TauTona Mine (South Africa) – Formerly the deepest, reached 3,900 m (12,800 ft). Now closed/deepening halted.

Kolar Gold Fields (Karnataka, India)

Champion Reef Mine reached a maximum depth of 3,048 meters (9,997 ft) in 1962. At that time, it was the second deepest mine in the world (after the then-deepest in South Africa). The mines were nationalized (Bharat Gold Mines Ltd.) and closed in 2001 due to diminishing returns and high costs. There are ongoing discussions about reopening.

Arizona's Deepest Mines

Arizona is a major copper producer. Its deepest mines are copper mines with gold as a byproduct:

• Morenci Mine: Open pit, not deep underground.
• Baghdad Mine: ~1,200 m deep.
• Sierrita Mine: ~1,000 m.
• No gold mine in Arizona approaches Kolar's depth.

USA's Deepest Gold Mine

Homestake Mine (Lead, South Dakota) – Reached 2,438 m (8,000 ft). Closed in 2002. Now the Sanford Underground Research Facility (SURF) for physics (dark matter, neutrinos). It was the deepest in the Western Hemisphere.

Summary Table

So, Kolar (Champion Reef) was far deeper than any Arizona gold mine, but it is not the world's deepest—that title belongs to South Africa's Mponeng.