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What problems are caused by opencast mining and by deep mining?
The effects can result in erosion, sinkholes, loss of biodiversity, or the contamination of soil, groundwater, and surface water by the chemicals emitted from mining processes.
What is the difference between the two types of mining?
Underground mines are more expensive and are often used to reach deeper deposits. Surface mines are typically used for more shallow and less valuable deposits. Placer mining is used to sift out valuable metals from sediments in river channels, beach sands, or other environments.
What is the difference between open cast mining and shaft mining Class 8?
Answers. Open cast mining is open on earth mining for minerals and shaft mining is underground mining for coal and oil.
What is opencast working?
Opencast mining operations involve the removal of huge quantities of overburden, dumping, and backfilling of the excavated area. These overburden deposits of waste material containing low-grade ores are represented as mine spoil dumps.
What is open cast mining?
Opencast mining is also known as open-put mining, open-cut mining, surface mining and also as strip mining, the later term being commonly used in the U.S.A. for opencast mining of coal. The overburden and the mineral, coal, are excavated in long strips of a few metres thickness and hence the operations are termed strip mining.
What is the difference between open pit mining and underground mining?
The Witwatersrand gold mine in South Africa is an excellent example of underground mining that exploits gold from ancient rocks at depths of up to 4 km underground. On the other hand, open-pit mining is the most common mining and ranges from very low-priced minerals to finely disseminated gold deposits.
What is the best example of underground mining?
The Aguilar mine (Jujuy), which in 2013 completed 84 years of uninterrupted work, is a deposit of zinc silver that is mined underground. The Witwatersrand gold mine in South Africa is an excellent example of underground mining that exploits gold from ancient rocks at depths of up to 4 km underground.
What is manual opencast working in coal?
Manual Opencast Working in Coal: The quarriable area is divided into sections along the strike so that overburden extraction takes place in some sections and coal extraction in others which have the coal already exposed after overburden removal. Small pillars of the rocks excavated are left for measurement.