There could be another twist here, claims are in the ground but the size spawns with the roulet you start when you drop a bomb. Example I will give is in a
EU scripting language:
Bomb dropped = yes
claim below = yes
ore type (area x) = narc, zinc, iron - random 1, 2, 3
claim size = personal luck * (3x deposited lately? + (-got anything big lately?)) + loot pool %
and the it goes DING