Stone Crushers, Rock Crushers, Screening and Crushing Machines

MGB series Hopper Discharge Feeder

Vibrating feeder is also called vibrating feeder. In the production process,...

MZA/K Series Circular Vibrating Screen

MZA / K series vibrating screen is a new round vibrating screen product base...

MF Series Fixed Shaft Circular Vibrating Screen

MF Series vibrating screen is a new round vibrating screen product based on ...

MC Series Single-Cylinder Hydraulic Cone Crusher

MC series single cylinder hydraulic cone crusher is developed from European ...

MJ Series Jaw Crusher

MJ series jaw crusher is mainly used as coarse crusher. It is made of advanc...

ML Series Vertical Shaft Impact Crusher

Ml series impact sand making machine is a brand new structure of ML impact s...

MS Series Triaxial Horizontal Screen

MS series three-axis elliptical vibrating screen is an international level v...

MGD Series Vibrating Feeder

Vibrating feeder is also called vibrating feeder. In the production process,...

Why open cast mining is the cheapest method yahoo answers

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    Mar 25, 2020· Open cast mining is a type of surface mining in which mineral resources are removed from the earth through large holes or pits dug into the surface. The term "open cast mining" is used most commonly in Great Britain. In the United States, open cast mining is usually called open-pit or open-cut mining. According to the Berkeley Laboratory for

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  • open-cast mining, shaft mining -

    Aug 18, 2008· Open cast mining is used where the resource is near the surface and widespread - examples are iron ore, bauxite and any other deposit that is near the earth's surface. A deposit which has a limited areal extent and/or is very deep will be mined by undergroung mining. This is more expensive, so is only justified where the grades are good.

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    To me as a mining engineer with many years experience in both types of mining, open cast mining means that the deposit is mined in a series of strips with the overburden from each successive strip moved or cast into the preceding strip. The meth

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    Mar 20, 2010· "Detrimental" effects of open pit mining? How about some positive benefits: 1. jobs. 2. taxes. 3. skills, education, and training. 4. technology. 5. standard of living. Mining has taken place for thousands of years and is a temporary use of the land. With proper mining and reclamation practices, there should be no detrimental effects at all.

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  • which are the ways through which land get - Yahoo Answers

    Apr 21, 2009· To a large extent, this has been stopped or is more controlled, and attempts have been made to use the quarries profitably e.g. sand pits have been turned into boating lochs and some have been used as landfills. Central Scotland bears the scars of years of coal mining, with pit binges and slag heaps visible from the motorways.

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  • What are the main methods of mining? American

    There are four main mining methods: underground, open surface (pit), placer, and in-situ 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.

  • Opencast Mining (Quarrying): Methods, Advantages

    Opencast mining or quarrying of minerals is easier than mining by underground methods. During quarrying the alluvium and rocks below which the minerals lie, are removed and dumped, in the initial stages, in a place which is not required in future for quarrying, residential or other purposes. The mineral exposed is completely extracted.

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