Tutorial $5$ Mineral Processing

QUESTION $1$

What is the power required to crush $100$ tons $\frac{?}{hr}$ of limestone if $80\%$ of the feed passes

$50800m$ screen and $80\%$ of the product passes $3175m$ screen? The work Index for

limestone may be taken to be $13\mathrm{.}03kW\frac{h}{t}.$

QUESTION $2$

A plant treats $210$ tonnes of material in a shift of metal grade $40\%$ and tailings has metal

grade $0\mathrm{.}2\%.$ Given that the feed to concentrate ratio calculate the mass of concentrate and

tailings.