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2.3 Method of Investigation and Design <br />A detailed description of the field investigation procedures is found in Appendix I. the following <br />' data was available for review as provided by BMG: <br />- geological plan showing outcrops in the pit vicinity <br />' - geological cross-sections <br />- air photos <br />- geological logs <br />hydrological reports <br />The geotechnical program consisted of: <br />a) Cell mapping survey of jointing in ail exposed rock outcrops in the vicinity of the pit area. <br />' For each structure, the joint characteristics most critical to design were recorded. This <br />included an assessment of the type of discontinuity, location, orientation, continuity, <br />roughness, infiil, rock strength, water condition and lithology. Outcrop mapping was <br />' generally restricted to the East Pit since the West Ore Zone had very little rock exposure <br />due to surficial cover, Figure 4. <br /> b) Review of previous drill logs. Exploratory drilling at San Luis includes reverse circulation <br /> and core drilling. Existing core logs and photographs were reviewed as shown in Figure 3. <br />' Existing core in the Santa Fe conglomerates and altered Pink Gneiss material were re- <br /> logged geo[echnically and sampled for purposes of strength assessment. These holes <br /> were located on the west wall of the West Pit (D88-39,D88~1,D88-35). <br /> <br /> c) Oriented diamond drilling was done in order to better identify the rock mass :strengths and <br /> jointing in the materials that will form the ultimate pit walls. This drilling consisted of five <br /> holes (D88~1,D88~2,D88~i3,D88~4,O88.85) varying in lengths from 191 feet for D88-83 <br /> which is located in the South wall to 440 feet for D88.60 which is located in the West wall <br /> of the ultimate west pit. This drilling was restricted to the West One Zone since the East Pit <br />t is a much smaller excavation and has more rock exposure. <br />d) laboratory testing of weak rack units. Samples for laboratory testing were ootained from <br />drill cores. Direct shear testing was conducted on the Santa Fe conglomerate, altered <br />Pink Gneiss, and the Green Clay material. Testing was conducted under jry and wet <br />conditions. <br />e) Establishing the depth of the water table below surface. This was determined by <br />Halepaska and Associates in their report on the `Preliminary Dewatering Plan for the San <br />Luis Gold Project/Aug,88'. <br /> <br />1 <br />