"Let's do it together "The specific gravity of the ore would...

"Let's do it together "
The specific gravity of the ore would range from 2.5 to 2.8.
If I assume 2.5 it makes very little difference in the overall assessment of the value of deposit.
As a higher value would increase the weight and grade /cubic meter but more expensive to extract because the material hardness would be much higher.

By introducing specific gravity to the equation, then we can start working with volumes to calculate the in-ground value of the orebody.

If I do not get confirmation from you readers that my calculations are correct, I will not continue.