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APPENDIX D <br />March 2000 -8- 993-2099.150 <br />would identify if the area required different remediation treatment), and whether any <br />lateral shallow workings were evident extending from the shafts. <br />3.3 Exploratory Drilling <br />Based on a combined assessment of composite mining plan (Drawing Nos. 1 and 2), the <br />topographic survey which includes identified surface disturbances (Drawing Nos. 3 and 4), <br />and the results of the surface reconnaissance and exploratory excavation programs, an <br />exploratory drilling program was developed and implemented. The objectives of the <br />exploratory drilling program were as follows: <br />? Conduct a "first-pass" assessment to locate open voids underground that <br />might become unstable in the future <br />? Obtain an approximate estimate of the vertical height of the surface <br />crown pillar, in areas where such voids were identified <br />Various approaches and criteria were used to select the locations of the drill holes. These <br />included the following: <br />? General trends in the underground workings can be noted from surface <br />disturbance information developed from the surface reconnaissance and <br />topographic survey information, which provide an indication of possible <br />connection of workings between shafts. Holes were drilled across these <br />lineaments between the shafts to determine if the underground workings <br />between shafts had been mined up close to surface. <br />? Underground workings which appeared to connect between shafts or to <br />be located along lineaments, even in some cases where the workings <br />were relatively deep, may have been mined up close to surface. Holes <br />were drilled across the alignment of such underground workings. <br />Ll <br />IAM2099 MAL BEP0R7%ZWAPPD.DM Golder Assodates