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2015410ensp enspbreaks the coal and the screw carries it back into the open and dumps it on an elevating conveyor this in turn carries the coal to an overhead bin or loads it directly into a truck auger mining is relatively inexpensive and it is reported to recover 6065 of the coal in the part of the bed usbm 1990

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20191120ensp enspcoal exports fall into two categories metallurgical coal which is used in the production of steel and steam coal which is commonly used to fuel boilers that generate steam used to produce electricity with relatively minor coal imports the united states has been a net exporter of coal since 1949 the earliest year of data collection

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