South African gold mine has more tunnels than the entire New York subway system

• The Mponeng Gold Mine has 380 kilometres of underground tunnels, making its network as long as the New York subway and 140 kilometres longer than the city's underground railway tracks.
• The Witwatersrand gold rush began in 1886, and the gold rush quickly established that the region was the site of the largest gold mineralisation on earth.
• Harmony Gold has invested heavily in Mponeng to keep it operating and approved funding in 2024 to extend the life of the mine.