Static ore pools are, IMO, a threat to the longevity of DU. They ensure that the barrier to entry will constantly increase, and there's no meaningful way to take a territory from someone without their consent.   I would propose the following: As you mine a territory, it begins to deplete the available ore pool (fewer L/h will be available). As the amount you mine increases, the depletion increases quadratically. Mining units will be configurable to mine less than their base rate if you