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April 1989 <br />• TABLE 3.4.A.16 <br />PIL[,AR SIZE AND FACTOR OF SAFETY-AREA I, B SEAM <br />-ROOM-AND-PILLAR MINING <br /> Factor Recommended <br />Pillar .Analyzed Pillar of Pillar <br /> Width x Length Safety Width x Lenth <br /> (ft x ft) (ft x ft) <br />Mains 60 x 120 1.5 60 x 120 <br />Barrier <br />beggiiininq 175 ft offset <br />of panel from F worki~igs >1.9 425 x 600+ <br />Iii-panel <br />chain 60 x 80 1.3 60 x 80 <br />Iii-panel <br />barrier 120 x Lx 2.0 175* x L <br />+ = Based on existing mine plan <br />• x = Panel Tenth <br />* = Assume small barriers left in the F seam <br /> <br />