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• <br /> <br />• <br />APPENDIX D <br />March 2000 -1- 993-2099.150 <br />1.0 INTRODUCTION <br />This report presents the results of an assessment conducted by Golder Associates Inc. <br />(Golder) regarding the historic underground workings within the proposed Phase IV Valley <br />Leach Facility (VLF) at the Cripple Creek & Victor Gold Mining Company's (CC&V's) <br />operation near Victor, Colorado. This report addresses the current stability of the historic <br />mine workings, the potential impact of the workings on the stability of the VLF <br />foundation, and the typical remediation measures that may be needed to ensure that the <br />integrity of the VLF foundation above the workings. <br />A similar assessment to the one presented herein was undertaken by Golder for the <br />Phase III VLF. The conclusions and recommendations of the assessment of the Phase III <br />VLF are presented in Golder's report titled Assessment of Underground Workings Within <br />Limits of Phase III Valley Leach Facility (CC&V 1998). <br />2.0 UNDERGROUND MINING <br />2.1 Historical Setting <br />A summary of the geology, mineralization, and mining within the Cripple Creek Mining <br />District is presented by Lindgren et al. (1906). The areas within and around the Phase IV <br />area were mined for many years by underground means starting in the 1890's. The gold <br />ore that was mined in the Cripple Creek Mining District was contained in a series of <br />steeply dipping veins. The various veins were generally sub-parallel to one another and <br />aligned in a northeast-southwest orientation, which is reflected in the underground <br />workings alignment shown on Drawing Nos. 1 and 2. Production mining of the veins <br />proceeded upwards from these working level excavations. <br />1:\9912 OMPIAL REPOR11 MAPPD.DM Golder Associates