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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. In contrast, deeper mineral ...
In Australia, bauxite is mined using an open-cut method. [4] This is possible because most bauxite in Australia can be found at or relatively close to the surface and is easily accessible by this method. [2] Open cut mining involves first removing the area above the bauxite ore called the overburden.
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 ...
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 Melaneur-Shelmalier-Black Jack-Overlander reef complex, on the north side of the town, was mined as an open cut 1990–91, before being backfilled as a golf course. The Nolan's Gully open cut commenced in 1993. [1] [165] Although modern mining revived the economy of the town, it did not replicate the building boom of the early 20th century. [1]
The Mexican Mining Chamber (Camimex) opposes the ban on open-pit mining, saying such a prohibition would cause a 1% contraction in the country's GDP and threaten some 200,000 jobs.
Batu Hijau is an open-pit mine. Ore is removed from the mining face using P&H 4100 electric shovels and loaded into Caterpillar 793C haul trucks (pictured). Each haul truck can move a payload 220 t (240 short tons) of ore. The trucks haul ore from the shovel to primary crushers.
Coal mining has had many developments in recent years, from the early days of men tunneling, digging, and manually extracting the coal on carts to large open-cut and longwall mines. Mining at this scale requires the use of draglines , trucks, conveyors , hydraulic jacks , and shearers.