Strike length $=2500$m

$50$m Dip of deposit

Width of deposit Density $=8$m

Loose density $=1\mathrm{.}78$t$/$m$^2$

Density $($Bank$)=2\mathrm{.}78$t$/$m

Grade $=6\mathrm{.}5$g$/$t

a$.$ Determine the gross in$-$situ tonnes of the deposit

b$.$ Determine the tonnage and stripping ratio of the project if you open pit the deposit to $20$m below surface