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PILLAR EXTRACTION USING CONTINUOUS MINERS. Overview. Now that longwall equipment has been developed to a stage where it is able to cope with most conditions satisfactorily, longwall mining is the most widely used method of secondary extraction. ...

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Continuous miners | Introduction | underground COAL

Continuous miners Though there are many variations in design, continuous miners mostly consist of five main elements: A central body to carry all other components mounted on some type of drive mechanism to provide mobility (most commonly caterpillar tracks). A "cutting head" ...

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History [] Early Miners The continuous miner has been available in some form since the late 1800s. The first machine to resemble a continuous miner was known as the English Channel Machine. The pneumatically driven machine could travel 1.5 miles (2.4 km ...

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Continuous miners account for about 45 percent of underground coal production. Conveyors transport the removed coal from the seam. ... Japan has a long history of coal mining dating back into the Japanese Middle Ages. It is said that coal was first discovered ...

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Pillar Extraction using Continuous Miners | Introduction | underground COAL

Some methods of pillar extraction using continuous miners are: Pillar splitting where roadways are driven through the pillars formed on first workings; the remnant pillars left would not normally be stable over extended areas.

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