* The open pit method of coal mining is an infrequently used method in which spoil is hauled from the pit by trucks and placed in a permanent storage area outside the pit. Although the maximum pit depth in area mining is currently about 45 meters (150 feet), an .
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Open pit mines can be used in coal mining, and they are used extensively in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum, and many minerals. In a open pit coal mine, the pit bottom would be the bottom mined coal seam elevation, since it is usually feasible to extract multiple seams when surface mining coal.
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