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Why open cast mining is the cheapest method yahoo answers

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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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    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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