A copper flotation circuit $($shown below$)$ operates with two stages $($Rougher$-$Scavenger$)$ of

flotation cleaning. The $Cu$ assays of all streams are listed below.

$f=0\mathrm{.}8\%,c1=8\mathrm{.}5\%,c2=2\mathrm{.}5\%,t1=0\mathrm{.}1\%,t2=0\mathrm{.}019\%$

Assume a flotation feed rate of $1000tph$ and determine the following:

a$.$ Overall grade of flotation concentrate

b$.$ Copper recovery and enrichment ratio obtained from the overall circuit.