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Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, [1] is a surface mining technique that extracts rock or minerals from the earth. Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface where the overburden is relatively thin.
Bauxite is mined in Australia using open-cut mining, which suits the relatively shallow bauxite deposits located mostly in Western Australia and Queensland. [2] [4] Mined bauxite is either exported or refined domestically into alumina. The large majority of domestic bauxite and alumina is exported to China. [5]
A box cut (box pit) is a small open cut built to supply a secure and safe entrance as access to a slope to an underground mine. Generally the box cut is sunk until sufficiently unweathered rock is found to permit the development of the decline. [ 1 ]
The mine works as an open cut operation and Mount Fubilan has been reduced to a deep pit in the ground in the course of the excavation of the Ok Tedi Mine. By 31 December 2004, 8,896,577 tonnes of copper concentrate (containing 2,853,265 tonnes of copper metal and 7,035,477 troy ounces or 218.8278 tonnes of gold metal) had been mined.
The Rolleston Coal Mine is an open-cut coal mine located in Central Queensland, Australia, with reserves amounting to 600 million tonnes of thermal coal. The mine has an annual production capacity of 14 million tonnes. [1] It is one of numerous coal mines in the Bowen Basin. The mine is wholly owned by Glencore. [2]
Peak Downs Mine is a large open cut coking coal mine in Queensland located 31 km SSE of Moranbah. [1] Peak Downs is one of seven mines in Bowen Basin owned by BHP Mitsubishi Alliance, Australia's largest coal miner and exporter. Production at Peak Downs started in 1972. By 2022 it was producing 37 million tonnes of coal per year. [2]
Cadia Mine is a series of large underground and open-cut gold and copper mines located in the Cadia Valley, about 20 kilometres south of the regional city of Orange, New South Wales, Australia. The mine has been developed throughout the 1990s and is a major employer in the region with an expected lifespan of several decades.
The open-cut mine supplies coal to Tarong Power Station and Tarong North Power Station. It is owned by Stanwell Corporation and operated by Downer Mining. Work first started on the mine in 1978. [1] The mine has five active working pits. It can supply a maximum of seven million tonnes of coal per year. [1]