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A new crusher station is to be located 450 metres below surface. Logistically (shorter load and haul cycle times), the best location (Location A) for the crushing station is in the Volcanic Tuff with mapping indicating an RMR of 45, and Q of 3.5 (with Stress Reduction Factor, SRF=1, Excavation Support Ratio, ESR=3). The alternative location (Location B) is in stronger Granodiorite, and is thought to be affected by a weak shear zone that isn't taken into account by the borehole logging RMR rating of 65, or the Q rating of 25 (SRF=1). See Appendices for the rock mass classifications. a) What Excavation Support Ratio (ESR) should be used for permanent underground infrastructure such as a crusher station? [2 Marks] b) Estimate indicative support requirements for Location A using the RMR and Q-System support charts provided. Assume that if no weakness zones are present, SRF=1 [10 Marks] A new crusher station is to be located 450 metres below surface. Logistically (shorter load and haul cycle times), the best location (Location A) for the crushing station is in the Volcanic Tuff with mapping indicating an RMR of 45, and Q of 3.5 (with Stress Reduction Factor, SRF=1, Excavation Support Ratio, ESR=3). The alternative location (Location B) is in stronger Granodiorite, and is thought to be affected by a weak shear zone that isn't taken into account by the borehole logging RMR rating of 65, or the Q rating of 25 (SRF=1). See Appendices for the rock mass classifications. a) What Excavation Support Ratio (ESR) should be used for permanent underground infrastructure such as a crusher station? [2 Marks] b) Estimate indicative support requirements for Location A using the RMR and Q-System support charts provided. Assume that if no weakness zones are present, SRF=1 [10 Marks]