18. estimate the unit profit in mining and processing a 0.80% copper ore deposit if the selling price of copper in concentrate is $1.73/kg and overall unit costs are $6.5/ton. overall recovery is 82%. calculate the cut-off grade of the copper deposit.

cut-off grade of the copper deposit. = 4.6 kg/ton 0r .46 % cu by weight

Explanation:

Given data:

percentage of deposite copper is 0.80%

selling price of cu is $1.73/kg

overall unit cost = $6.5/ton

overall recovery 82%

                   = 11.3 $/ton

unit profit = (gross value - unit costs)

                = (11.3 - 6.5)

                =4.84 $/ton

cut off grade of copper deposit

       = 4.6 kg/ton 0r .46 % cu by weight

(bro she is ancient)

j < 14

j is jakes age

since jake is younger it makes his age less than his sisters

(if you meant she is 14)