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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 ...
Legal mining, albeit more environmentally-controlled than illegal mining, contributes to some substantial percentage to the deforestation of tropical countries. [86] [87] Open-pit nickel mining has led to environmental degradation and pollution in developing countries such as the Philippines and Indonesia.
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 ...
Copper is largely extracted from open-pit mines, which, like the gold mine in the social media post, can be enormous. In addition to devastating area ecosystems , pit mines expose local ...
Open-pit mining uses cyanide, which is poured over the broken-down ore and dissolves the gold. After this process, gold is extracted from the bottom and processed. [10] Environmental problems followed after the beginning of open-pit mining, as acidic and metal-rich water drained into the Alamosa River. Drainage from open-pit mining often has a ...
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.
Once a mine closes, mining facilities that occupy a small area of the disturbed land can either be salvaged or town down. [13] The main visual and aesthetic impacts of mining are the open pits and waste rock disposal areas. Open-pit mining disturbs larger areas than underground mining making the visual impacts much greater. [13]
[3] [4] The impact of sub-surface mining on the surroundings will be less than for open pit mines. However, sub-surface mining may also cause subsidence of the surface due to the collapse of mined-out area and abandoned stone drifts. [3] Disposal of mining wastes, spent oil shale (including semi-coke) and combustion ashes needs additional land ...
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