Table $1.$

Parameter

Quantity

Ore demand

$10,000$ tonnes$/$shift

Stripping requirement

$40,000$ m$3/$ shift

Shovel loading time

$4$ minutes

Backhoe loading time

$3$ minutes

Average velocity of loaded truck

$10$ m$/$s

Average velocity of empty truck

$15$ m$/$s

Distance to and from waste disposal site

$2500$ m and $2800$ m respectively

Haulage distance to stockpile

$6\mathrm{.}5$km

Truck Capacity

$50$ m$3$

Truck discharge time

$18$ seconds

Truck waiting time

$20$ seconds.

Equipment utilisation

$80\%$

Density of ore

$2\mathrm{.}200$ tonnes $/$ m$3$

Truck delay time

$30$ secs

Work Schedule

Two $8$ hours shifts$/$day$,$ six$(6)$ days per week

what is the stripping ratio and recovery $\%?$