Roof Bolting

CIM Bulletin1950
Note. - Securing mine roof through consolidating thin or otherwise incompetent strata to increase overall thickness of the immediate roof beam is a new method of roof support and control which has aroused great interest amongst mining engineers and which is now being experimented with and thoroughly investigated by the United States Bureau of Mines.
Keywords: bolting, coal mine, figure 17, strata, United States Bureau of Mines
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