1. Complete the Table below, assuming a profit allowance of $3.00 per tonne. Then, assuming a stripping cost of $2.00 per tonne of waste and a copper price of $3.63 /lb, calculate the economic stripping ratio (SR_e) for each of the copper head grades. Also, calculate the cutoff grade for copper prices of $3.40/ lb and $2.10/ lb. Show your calculations. -- Note: Head grade is a general term referring to the grade of ore delivered to the processing plant. Since the broken ore comes from various sections of a mine, the ore accepted at the Mill/Processing plant consists of a blend of various ore grades. Therefore, the term head grade or simply head is commonly used in the plural form, i.e. head grades or heads. (20 points)

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0.92 91 0.87 89 0.75 85_ 0.68 82 0.55 78_ 0.43 66 T T T T T Heads % Cu % Rec'd Rec'd Cu (Kg/tonne) Value of Ore ($/tonne) T Costs ($/tonne) Mining - Milling Others (Depr, etc.) Total Prod. Costs ($/tonne) Profit Allowance ($/tonne) Total Cost ($/tonne) 6.00 6.00 6.50 5.00 6.00 6.50 | 5.00 6.00 6.75 5.00 6.00 6.00 6.75 17.00 5.00 5.00 750 500l 5.00 Net Value ($/tonne) Stripping Costs ($/tonne) Economic Strip ratio 0.92 91 0.87 89 0.75 85_ 0.68 82 0.55 78_ 0.43 66 T T T T T Heads % Cu % Rec'd Rec'd Cu (Kg/tonne) Value of Ore ($/tonne) T Costs ($/tonne) Mining - Milling Others (Depr, etc.) Total Prod. Costs ($/tonne) Profit Allowance ($/tonne) Total Cost ($/tonne) 6.00 6.00 6.50 5.00 6.00 6.50 | 5.00 6.00 6.75 5.00 6.00 6.00 6.75 17.00 5.00 5.00 750 500l 5.00 Net Value ($/tonne) Stripping Costs ($/tonne) Economic Strip ratio