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• <br /> <br />SUBSIDENCE IMPACTS 1988 <br />Page 2 <br />Visual monitoring is concentrated over areas of retreat mining (past or <br />present), in particular areas mined under low overburden. <br />The results of visual monitoring indicate <br />subsidence in 1988. Visual impacts were <br />8 North-12 North, 8 North-11 North, nor <br />retreat mined in 1985 and/or 1986. <br />that there was no additional surficial <br />not apparent above 9th East-1st North, <br />5 North-1st West, all of which were <br /> <br />