Answer:
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%
[tex]Gross value = grade\times recovery\times price\times conversion factor[/tex]
[tex]= 0.0080\times 0.82\times 1.73\times 1000[/tex]
= 11.3 $/ton
unit profit = (gross value - unit costs)
= (11.3 - 6.5)
=4.84 $/ton
cut off grade of copper deposit
[tex]= \frac{(mining cost)}{(recovery\times selling\ price)}[/tex]
[tex]= \frac{6.5}{(0.82\times 1.73)}[/tex]
= 4.6 kg/ton 0r .46 % cu by weight
