A mine technician from another college visiting the Haileybury School of Mines was asked to solve the following question A mine produces three separate ore concentrates The ore concentrates assay 35 Zn, 38 Cu and 26 Pb respectively The cost of shipping each of the concentrates to the nearest smelter is $28 ton The treatment cost for each of the concentrates is $85 ton and the smelter recovery for each metal in the ore concentrates is 92 5 The penalty for impurities in each of the concentrates is $33 ton Assuming the price for Zn is $1 23 lb, Cu is $2 56 lb and Pb is $1 01 lb calculate The Total Gross Value of the three concentrates The Total Net Smelter Return of the three concentrates The visiting mine technician write the following solution for this question and shows it to a Haileybury Mine Technician student a) Zn Price 1 23 x 2,000 lbs $2,460 ton Shipping $28 ton Treatment $85 ton Gross Value $2,460 $28 $85 $2,347 ton 2,000 $1 17 lb Cu Price 2 56 x 2,000 lbs $5,120 ton Shipping $28 ton Treatment $85 ton Gross Value $5120 $28 $85 $5,007 ton 2,000 $2 50 lb Pb Price 1 01 x 2,000 lbs $2,020 ton Shipping $28 ton Treatment $85 ton Gross Value $2,020 $28 $85 $1,907 ton 2,000 $0 95 lb b) Zn Gross Value $2,347 ton Penalty $33 x 92 5 $30 53 ton Recovery loss (100 92 5 ) x $2,347 $176 03 ton Smelter return $2,347 30 53 176 03 $2,140 44 ton 2000 $1 07 lb Cu Gross Value $5,007 ton Penalty $33 x 92 5 $30 53 ton Recovery loss (100 92 5 ) x $5,007 $375 53 ton Smelter return 5,007 30 53 375 53 $4600 94 ton 2000 $2 30 lb Pb Gross Value $1,907 ton Penalty $33 x 92 5 $30 53 ton Recovery loss (100 92 5 ) x $1,907 $143 03 ton Smelter return 1,907 30 53 143 03 $1733 44 ton 2000 $0 87 lb The Haileybury student reviews the solution and tells the visiting Mine Technician it is wrong Explain in detail why the Mine Technician solution is incorrect and write the correct solution for this question (6 points) please type your answer, please do not write on the paper and post it

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A mine technician from another college visiting the Haileybury School of Mines was asked to solve the following question. A mine produces three separate ore

A mine technician from another college visiting the Haileybury School of Mines was asked to solve the following question.

A mine produces three separate ore concentrates. The ore concentrates assay 35 % Zn, 38% Cu and 26% Pb respectively. The cost of shipping each of the concentrates to the nearest smelter is $28/ton. The treatment cost for each of the concentrates is $85 /ton and the smelter recovery for each metal in the ore concentrates is 92.5%. The penalty for impurities in each of the concentrates is $33/ton. Assuming the price for Zn is $1.23/lb, Cu is $2.56 /lb and Pb is $1.01/lb calculate: