This exploitation method consists in leaving in the room, for the duration of the mining, an important part (approximately 60%) of the broken ore. After each blast, the ore surplus corresponding to the swelling (approximately 40%) is extracted in a way to leave free space in between the ore in place and the broken ore allowing circulation of the workers. The broken ore, kept in the room serves as a floor and contributes to support the walls. The room is emptied when the bloc in entirely blasted.


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