potash potential npv (10%) of $3.3-$7 bn

Using the following info from the RMResearch report:

Mine Life: 25 years
Production rate: 2MTpa
Projected Potash price: $500-700/tonne KCL FOB
Capital Cost: $2.4 Bn
Op and sustaining cost: $183/tonne KCL

I get:

NPV @ 10% discount rate and $500/tonne KCL FOB of $3.355 Bn and an IRR of 23%.

NPV @ 10% discount rate and $700/tonne KCL FOB of $6.986 Bn and an IRR of 42%.

Could be a monster IMO! What would that make it a 300-700 bagger? LOL. Might have to get a small parcel!