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<br />2.2.4 Factor of safety, FS: <br />FS = (Pillar strength /Pillar stress) <br />FS = (6,395/2,160) = 2.96 <br />FS=2.96 <br />2.2.5 Roof wntrol <br />13 <br />The mine roof is oanposed from sandstones, siltstones end <br />shales. It is regular and smooth and the opal parts quite easy from <br />• it. Cn31 roofs .in the entries and in crosscuts are bolted. <br />• <br />