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<br />April 1989 <br />TABLE 3.4.A,7 <br />RESOURCE RECOVERY, GROUND CONDITIONS AND SURFACE <br />IMPACT FOR ASCENDING AND DESCENDING MINING <br />SEQUENCES FOR AREA III <br /> <br />• <br /> TYPE SEAM RESOURCE GROUND SURFACE <br />MINING OF SEQUENCE RECOVERY CONTROL IMPACT <br />SEQUENCE CAVING (%) <br />Asceiidinq Full/ B 83 Exce.ller~t Minimal <br /> Lo <br />all - -- <br /> ugw <br /> E 76 Marginal Moderate <br /> F 74 Difficult Excessive <br /> Aver age 78 <br /> Fart?.al/ B 55 Excellent Minimal <br /> Room and <br /> Pillar <br /> E 27 Acceptable Minimal <br />' F 10 Marginal Minimal <br /> Average 50.3 <br />Descending Fu11/ F 86 Marginal Minimal <br /> Longwall <br /> E 83 Marginal Excessive <br /> B 76 Er.cel.l.ent Severe <br /> Average 81.1 <br /> Partial/ F 74 Marginal Moderate <br /> Room and <br /> Pillar -- - <br /> ' E 61 .Marginal Moderate <br /> B 24 Cood Moderate <br />- - - Average 51.1 <br />