| 摘要 |
PROBLEM TO BE SOLVED: To conduct retraction for each blast and readily move a belt conveyor to a mucking position. SOLUTION: A movable conveyor apparatus 4 is provided slidably between a crusher 9 and a backup deck 11, and the movable conveyor apparatus 4 is moved back and forth by following the move of the crusher 9 accompanied by the mucking operation, and the blast operation of a face [K].
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