Question

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.

Answer 1

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

Step-by-step 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%

`Gross value = grade* recovery* price* conversion factor`

`= 0.0080* 0.82* 1.73* 1000`

= 11.3 $/ton

unit profit = (gross value - unit costs)

= (11.3 - 6.5)

=4.84 $/ton

cut off grade of copper deposit

`= ((mining cost))/((recovery* selling\ price))`

`= (6.5)/((0.82* 1.73))`

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