(Solved): 2. A section of a copper porphyry ore body is as shown. Determine the most profitable final pit out ...

2. A section of a copper porphyry ore body is as shown. Determine the most profitable final pit outline using Lerchs-Grossman 2D given that the cut-off grade of 0.45% Cu. 1 block has dimensions of 16m x 16m x 16m (HxLxW). The cost of mining a block waste is $50 and that a value of a block of ore is approximated to be $100 x (grade expressed in %). Keep the pit angle at 45 degrees. (12pts) 0.5 0.5 1 0.9 0.3 0.3 0.2 0.1 0.1 0.2 0.1 0.1 0.4 0.3 0.6 0.7 0.6 0.3 0.2 0.2 0.3 0.7 1.8 0.8 0.4 0.3 0.1 0.3 0.2 0.1 0.3 0.3 0.2 0.8 0.9 1 0.3 0.3 0.2 0.1 0.3 0.4 0.9 0.2 0.2 0.1 0.4 1.3 1.2 0.3 0.2 0.2 1.3 2.3 3.3 0.4 0.3 0.1 0.1 0.1 0.6 0.5 0.2 0.1 0.3 0.7 1.8 1.3 0.9 0.3 0.2 0.3 0.4 4.4 4.3 0.4 0.2 0.1 0.1 0.1 0.2 0.2 0.2 0.1 0.3 2 3.5 0.9 0.3 0.2 3.4 4.2 0.4 0.4 0.3 0.3 0.1 0.1 0.1 0.2 0.1 0.1 0.3 0.4 0.8 0.8 1.3 0.3 0.2 0.3 2.8 3 0.3 0.3 0.2 0.1 0.1 0.1 0.1 0.2 0.2 0.3 0.4 0.4 0.5 0.7 0.4 0.3 0.1 0.8 2 1.7 0.1 0.1 0.1 0.2 0.1 0.1 0.1 0.2 0.3 0.5 0.3 0.4 0.4 0.5 0.5 0.3 0.2 0.7 0.4 0.5 0.1 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.2 0.5 0.4 0.5 0.3 0.2 0.2 0.2 0.8 0.4 0.4 0.5 0.2 0.2 0.7 0.1 0.2 0.2 0.1 0.1 0.6 0.4 0.5 0.2 0.2 0.1 0.2 0.4 0.5 1 0.1 0.1 0.1 1.8 4 0.6 0.2 0.2 0.2 0.2