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• Drill hole information and profiles (see Dorchester tl <br />• Permit Submission). <br />• Generalized columnar sections (see Dorchester #1 Permit <br />Submission). <br />• Mapped workings near the Dorchester No. 1 Mine (see maps <br />in Appendix B). <br />• Current mine plan for the Dorchester No. 1 Mine (see maps <br />in Appendix A). <br />with regard to potential impacts of geologic conditions on <br />mine subsidence on this particular site, there are three <br />characteristics that have a significant effect: <br />• Type of overburden material. <br />• Depth of beds. <br />• • Presence of structural discontinuities (faults). <br />As discussed earlier, the majority of the mine lies on the <br />northeast limb of the Chandler Syncline, where the bedrock has a <br />tendency to dip in a westerly direction at angles on the order of <br />6 degrees. A 6-degree dip is small enough that it will exert <br />minimal influence on the subsidence profile and the area of <br />influence. The Chandler Syncline is 'asymmetric', meaning that <br />the dip of the bedrock is significantly different on one side of <br />the axis than the other. In the extreme western and <br />southwestern portions of the mine, to the southwest of the axis <br />of the syncline, the beds dip fairly steeply to the north and <br />northeast. Specific information on actual degrees of dip in this <br />. area is not presently available at this time. However, the <br />effect of the increased dip in this area would be to actually <br />23 <br />