The room is driven in this way from one haulage road to another or to the boundary of the ore body.
When rock filling is available, as when the ore contains much barren material to be left behind in mining, the ore body is divided into blocks of convenient height as above, and these blocks are divided into floors, the bottom floor of each block however being attacked.
Grade Relative quantity or the percentage of ore mineral content in an ore mineral content in an ore body.
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