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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.
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 ]
As such they tend to be tabular, flat and really large, covering many square kilometres of the Earth's surface. However, at any one time the area of a deposit being worked for the nickel ore is much smaller, usually only a few hectares. The typical nickel laterite mine often operates as either an open cut mine or a strip mine. [citation needed]
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]
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 Middlemount Coal Mine is an open-cut mine located approximately 90 kilometres north-east of Emerald and some 7 kilometres west of the township of Middlemount in Queensland's Bowen Basin. The mine produces medium-volatile pulverized coal injection (PCI) coal and semi-hard coking coal for the export market. Full scale operations at the open ...
COPENHAGEN (Reuters) -Greenland Prime Minister Mute Egede said on Monday the country is looking to strengthen its defence and mining ties with the United States, albeit on its own terms, following ...
Goonyella Riverside Mine is a large open cut coking coal mine in the Bowen Basin. [1] It is one of many coal mines in Central Queensland, Australia and is located at Moranbah about 30 km north of the township. [2] The mine produced 12.4 million tonnes of metallurgical coal from July 2012 to June 2013. [3] In 2019 this figure was 17.1 million ...