also mining now takes way longer before you get satisfied (which is around 2 stacks of gold)

This could be a new slimefun machine, no idea how hard itd be to implement but it could be decently expensive but smelt your gold x2 instead of just readding it to carbonados. Maybe it could also take energy so it's more of a trade off.

Personally, I just give up on mining and make all my money off of ah. People are constantly adding more money to the game with /vote so it all balances out. Till someone hoards it. Even then, there is enough money for everyone.