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Open pit excavation is carried out with power shovels draglines front end loaders and gyratory crushers jaw crushers roll crushers and impact mills are used for primary and secondary crushing after crushing the size of the material is further reduced to 50 micrometers m or smaller by grinding using smooth rolls media mills
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Get Price12 open pit vs underground mining methods while most mineral deposits can be mined by either surface or underground methods some minerals can only be recovered in a hybrid manner usually by initial extracted by open pit mining followed by underground methods here a brief comparison is made
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Get PriceJun 23 2017 an openpit mine is exactly what the name implies a big hole or pit in the ground the pit in an openpit mine is created by blasting with explosives and drilling this type of mining is typically used to mine gravel and sand and even rock when openpit mining is used to extract rock from the earth the pit is often called a quarry
Get PriceJan 09 2016 basic concept 12 open pit mining method 13 bench 14 open pit bench terminology 15 bench height 16 cutoff grade 17 open pit stability i pit slope ii pit wall stability iii rock strength iv pit depth v pit diameter vi water damage vii strip ratio sr 18 openpit mining sequence 19 various openpit and orebody
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Get PriceThe three types of crushers most commonly used for crushing cdw materials are the jaw crusher the impact crusher and the gyratory crusher figure 44 a jaw crusher consists of two plates with one oscillating back and forth against the other at a fixed angle figure 44a and it is the most widely used in primary crushing stages behera
Get PriceScreen oversize serves as feed to the secondary crusher while screen undersize is the finished product see figure 1 for throughputs of 500 to 1000 metric tons per operating day usually 2 shifts a closed circuit tertiary cone crusher is usually added to the crushing circuit outlined above
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