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1 <br />' Sector fll and IV have no adverse structures within the 8lotite Gneiss. An inter-ramp design of 55 <br />Is recommended. <br />c) South Wall <br />Sector W4 Is comprised of Santa Fe material which is rated as having a design SRMR of 5 - 15%. <br />' This is based upon information derived from D88~(i3. The slope is designed at 38° for a vertical <br />height of 150 feet of Santa Fe. It is critical that this slope be dry during excavation This will be <br />' achieved through a well dewatering program as outlined by Halepaska (1988). Piezometers along <br />the south wall must be installed in order to determine the effectiveness of the dewatering program. <br />~ Horizontal drains along the south wall will be required 'rf water levels can not be maintained below <br />'' the excavation. <br />' Sector V is controlled by jointing within the Bioti[e Gneiss. The wall angle is designed to not <br />undercut the potential failure surtace, Table 6. <br />' d) East Wall <br />' Sector WS is comprised of Santa Fe material which is rated as having a design SRMR of 5 - 15%. <br />The design is based upon information derived from D88~4. The wall slope is designed for 35° for <br />a vertical height of 210 feet. <br />~' Figure 20a is an outcrop of Santa Fe/altwium as observed in the vicinity of the south wall. <br />' Sectors VI to X are controlled by jointing within the Biotite Gneiss. The wall angle is designed so <br />as to not undercut the potential failure surtace, Table 6. <br />' West Pit Ore Zone <br />' a) North Wall <br />Sector I is characterized by a strong foliation/joint set which trends east -west and dips to the <br />' south at 36°. This may result in large planar failures to occur if allowed to dayilght within the pit <br />wall. This slope is designed so as to not undercut this potential failure surtace. If the joint <br />continuity is lower than what was observed in the outcrop mapping as the ultimate wa1V is exposed <br />then a slope steepening to 45° is possible. However, present cell mapping indicates that this wall <br />be designed at 35°, Figure 20b. <br />.' b) West Wail <br />' Sector II is comprised of Biotite Gneiss material. Adverse joint combinations are not present. The <br />Inter-ramp angle is designed at 55°. <br />1 <br /> <br />