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This investigation was oriented toward quantifying the intact rock pro- <br />- perties, the nature and extent of planar defects, and the occurrence of <br />ground water, in order that the effect of these conditions on the designed <br />pit slopes could be evaluated. <br />\' <br />r C. PURPOSE AND SCOPE <br />r <br />The purpose of the present investigation is to determine the maximum <br />feasible mine wall slopes for an open pit mine to the depths of the "F" <br />coal seam (approximately 400 feet) and the "J" coal seam (approximately <br />f 800 feet). The determined slope angles would be incorporated into mine <br />` feasibility studies by the Colowyo Coal Company. <br />The scope of the investigation program included the following work items: <br /> <br /> <br />1. Field Work - Two W. A. Wahler and Associates engineers were <br />on site on December 19, 1974, and from January 6 to January 17, <br />1975. During these periods, Pir. William 81ank of Colowyo, was <br />assigned to the investigation to become familiar with the tech- <br />nology and to assist with the work. Information obtained <br />during the field program includes the following: <br />a. Ground water <br />1) surface water location <br />2) drill hole water levels <br />3) personal descriptions of underground mine water <br />.conditions <br />b. Rock quality <br />L <br />L <br />WAWRNLEN <br />& ASSNCI~i6 <br />1) rock quality logging of stored core from 17 drill <br />holes, a total of 7,120 feet of core <br />2) sampling of selected core sections for laboratory <br />testing <br />3) RQD indexing of photographs of boxed core Erom 28 <br />holes, a total of 13,181 feet of core <br />Project 0807 <br />I I-~2 <br /> <br /> <br />• <br />