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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 ...
Open-pit mining accounts for 60% of the country's mining production value and is critical for extracting key resources like gold, silver, copper and strategic minerals like lithium.
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]
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 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.
The deepest open-pit mine in the world is Bingham Canyon Mine in Bingham Canyon, Utah, United States, at over 1,200 metres (3,900 ft). The largest and second deepest open-pit copper mine in the world is Chuquicamata in northern Chile at 900 metres (3,000 ft), which annually produces 443,000 tons of copper and 20,000 tons of molybdenum. [119 ...
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 Grassy Mountain Coal Project was a proposed open-pit mine to produce metallurgical coal, initially submitted to the Alberta Energy Regulator by the Australian-based Benga Mining in 2015. The proposed mine was located on a previously abandoned mine site near Crowsnest Pass, Alberta , Canada in the eastern slopes of the Rocky Mountains.