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Get PriceUnderground Mining Deep Mining is necessary when the coal is several hundred feet below the surface Some underground mines are thousands of feet deep
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Get PriceOften the extraction of coal from the seam during mine development is called first mining the extraction of the remaining seam is called second mining Mining methods Modern underground coal mining methods can be classified into four distinct categories room and pillar longwall shortwall and thick seam Room and pillar mining
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Get PriceTrends in key mining activities The analysis considered key mining activities jumbo underground mining development long hole drilling load haul dumping and trucking The top line trends show Jumbo advance rates have increased by around 40 percent over the last 20 years Long hole drilling productivity has increased by around 20 percent
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Get PriceCurrently one of Australia s largest underground mines is Newcrest s Gold Silver and Copper Cadia Valley Operations near Orange in NSW It is estimated that the mine has proven contained metal reserves of approximately 37 million ounces of gold and million tonnes of copper Cadia s mine alone has employed over 1900 direct and
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