Sorry, I agree. Gold Mines were designed primarily for newer players. Our awesome accomplished players like yourself find themselves with a lot of “catch up” to do that they would’ve normally done while leveling up over several months. Unfortunately, this impedes completing recruiting expeditions at high levels, and I’m sorry for that. We wanted to make this transition smoother, but for various reasons we couldn’t. We’re planning to replace recruiting expeditions with different sources of coins in the next big release (so this issue will become redundant), and in the meantime Allied Raids provide a new source of coins (it doesn’t fully cover recruiting expeditions for top players who were doing lots of quests, but it helps a little).
Mines will be worth unlocking, but it’s okay to spread out the grind and not rush too hard to level it up (which I know from first-hand experience is pretty rough).
Sorry we weren’t able to orchestrate a smoother launch for our best and most dedicated players. We’ll try to make future transitions better.
EDIT: Please continue the discussion here: New Quest: Get 70000 gold from Mines