(b) Calculate the cut-off grade (Gcut-off) in g/t of gold (Au) for an open pit with three pushback options and the highlighted block shown in Figure Q2- b. The values of the block parameters are as follows: Tonnage T = 883 t, Ore grade G = 0.42 g/t, Gold price P = 37 $/g, Mining cost cm = 4.9 $/t, Processing cost Cp = 9.6 $/t, Recovery R = 98 %. Having defined the ultimate pit limit after these three pushbacks, should this mining operation send the highlighted block to the waste dump or to the process plant? (15 marks) Block ore properties Block tonnage (t): Block grade (g/t Au): Gold Price ($/g): Cost to mine block ($/t): Cost to process block ($/t): Metallurgical recovery (Co): T G P Cm R Figure Q2-b. Block valuation in a three pushback open pit mining excavation (b) Calculate the cut-off grade (Gcut-off) in g/t of gold (Au) for an open pit with three pushback options and the highlighted block shown in Figure Q2- b. The values of the block parameters are as follows: Tonnage T = 883 t, Ore grade G = 0.42 g/t, Gold price P = 37 $/g, Mining cost cm = 4.9 $/t, Processing cost Cp = 9.6 $/t, Recovery R = 98 %. Having defined the ultimate pit limit after these three pushbacks, should this mining operation send the highlighted block to the waste dump or to the process plant? (15 marks) Block ore properties Block tonnage (t): Block grade (g/t Au): Gold Price ($/g): Cost to mine block ($/t): Cost to process block ($/t): Metallurgical recovery (Co): T G P Cm R Figure Q2-b. Block valuation in a three pushback open pit mining excavation