You need to find out the maximum NPV of a hypothetical iron ore open pit as shown below. The iron ore grade is 72% and recovery is 90%. The market price of iron ore is S100/ton. The ore and waste block size are 30 by 30 by 30 m3 and annul production of six blocks (mining + stripping) is there. The mining cost is $35/ton and the stripping cost is $25/ton. The density for the ore and waste is 4.5 ton/m and 2.5 ton/m respectively. Assuming initial investment $50 million the interest rate is 5% per year. W = waste;O = ore. W W WW W W W W WWW W W W WOW WOW W W W w WO ooW O W WW WOO0 WOO