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• <br />Table of contents <br />List of tables <br />List of figures <br />1. ]NTRODUCTICN <br />2. FAS1'SI1~ QIAL MII~ <br />2.1 <br />2.2 <br />• 2.2.1 <br />2.2.2 <br />2.2.3 <br />2.2.4 <br />2.2.5 <br />Roan arx3 pillar mining method <br />Natural oarlitions of the E seam <br />Results on the me~anical properties of opal <br />and rocks <br />Pillar stress <br />Pillar strength <br />Factor of safety <br />Roof control <br />3. SURFACE SUffiIDESICE PRIDICTION <br />3.1 Determinatirn of the angle of draw <br />3.2 Calculation of the subsidence trough <br />4 <br />5 <br />7 <br />9 <br />11 <br />17 <br />11 <br />12 <br />13 <br />14 <br />74 <br />15 <br />16 <br />17 <br />2 <br />• <br />