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• refuse pile. This would occur if it becomes economically feasible to <br />mine through the area containing the rock splits. For purposes of the <br />permit, it is assumed that his will occur and additional waste rrck will <br />be generated. Based upon an average thickness of 1 foot of rock over <br />the area, an additional 80,000 yd3 of waste rock would be added to the <br />refuse pile. This represents 8% of the total volume of the pile, with a <br />corresponding decrease in the life span. <br />In view of the fact that the pile is not expected to be completed <br />for a period of twenty years, ample opportunity will be afforded to <br />increase the size of the pile, if necessary. If it is necessary to <br />• <br />• <br />(REV. 12/13/83) <br />IV-71a <br />