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25 <br />CJ <br />4, OJN(S USICN <br />Maximum subsidence, slope and strain have baen determined for <br />the E seam coal seam located in the Harvey Gap area. The calculated <br />values have been transferxed to the inclined seam following the <br />approach published in the Subsidence Engineer's Handbook. <br />The. line of maximum subsidence has been drafted on a topo- <br />graphic map with the ground surface extent outlined by the ~rodified <br />angle of draw. Twenty six surveying Points have been reocrrurended for <br />verifying the predicted values of maximum subsidence aru~ strain. <br />The surface extent of the subsidence area could be reduced if <br />• the right lower part of the panel is only partially developed. Fig- <br />ore 14 shows that the subsidence area mold then be projected inside <br />of the property area. If such approach is adopted then an undcs- <br />ground observation of pillars mupled with the surface subsid~,~re <br />surveying is reoorrnnended. Results fron these r~asurermnts slwuld <br />provide the mine operator with valuable data enabling better s,t,- <br />sidenoa control. <br /> <br />