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The Actual Difference Between Surface and Underground Min,

The Actual Difference Between Surface and Underground Min,

2012-1-1 · Surface mining methods dominate the world production of minerals Currently, almost all non-metallic minerals [more than 95%], most metallic minerals [more than 90%] and a large fraction of coal [more than 60 percent] are mined by surface methods Of the over 30 billion tonnes of ore and waste materials that are mined each year, surface mining .

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