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2 . 05 .6 Page 25 <br /> Based on experience in extracting pillars in the King Coal <br /> Mine , condition of old workings , drill hole data, geologic <br /> conditions , rock strength, overburden depth and monitoring, <br /> surface subsidence is only just beginning - and only in those <br /> areas where the Cliff House Sandstone has been partially removed <br /> by erosion. If ground subsidence reaches the surface in areas of <br /> thicker overburden, it is expected to be in the form of troughs <br /> resulting from gentle settling. In either case, impact will be <br /> minimal - tension fractures in soil will heal through weathering <br /> and settling and maximum depth of settling and subsidence will be <br /> determined by survey monitoring . <br />