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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.
When coal seams are near the surface, it may be economical to extract the coal using open-cut, also referred to as open-cast, open-pit, mountaintop removal or strip, mining methods. Opencast coal mining recovers a greater proportion of the coal deposit than underground methods, as more of the coal seams in the strata may be exploited. This ...
The Siilinjärvi carbonatite complex, [1] an open-pit mine owned by Yara International, in Siilinjärvi, Finland Coal strip mine in Wyoming. Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed, in contrast to underground mining, in which the ...
The Olive Downs Complex is an open-cut mine for metallurgical coal in the Bowen Basin of Queensland, Australia. It is located 40 kilometres south-east of Moranbah, about 140 km south-west of Mackay. The mine is accessed via the Sheldon Bridge over the Isaac River. [1]
Surface mining, mining conducted down into the ground, but with the sky open above Open-pit mining , where the overburden is removed and put in a different location, leaving a large pit at the end. Strip mining , where the overburden is stripped off and placed onto the area where the mineral (usually coal) has already been mined out, allowing ...
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 ]
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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 ...