What do we need for a viable mine/deposit? so far it looks like...

What do we need for a viable mine/deposit?

so far it looks like 1-2% for 1km long, 20-40m wide and 150-200m deep.

but it’s covered by 100m or dirt or so.

is that viable? What needs to improve to make it viable if it’s not?

what would that be worth?

how big would the other conductors need to be if we already had a plant for this one?