⛏ Balmain Colliery

Balmain Colliery was a coal mine located in Birchgrove in the inner-west of Sydney, in the state of New South Wales, Australia. It produced coal from 1897 until 1931 and natural gas from 1937 to 1950. At approximately 800 metres (2,600 ft) in depth, it remains the deepest coal mine ever to have been sunk in Australia.