I think we have a mine like Carajas at Nkout
https://www.mining-technology.com/projects/carajas/ May be less rich but a better final product going 800 m deep
Zone 110, 120, 130, 140, 150 make about 1500 m on 10 km and 100 m deep
It can be looked at the 43101 around page 100
Possibility of 1,5 m3 combined material
https://www.online-calculators.co.uk/volumetric/roomvolume.php or 3 bt at density 2
And look at p. 129/144 the grey zone not incorporated due to economic
But at DMTU of 2.40 instead of i,50, should be incorporated IMO
https://www.afferro-mining.com/i/pdf/technical_filings/2012/August/U4749_Nkout%20MRE%20June%202012_Final.pdf And you have 125 km of this stuff
Nkout 50km
Ako 50km
Ntem 50 km
Ngoa
fig 13.27 and 13,28
Conclusion IMO
Just by changing the economic to actual(Nkout), you multiply you resource by 4 or 10 bt
More after you eliminate the mountain , deposit continue probably down the 800 m