I have the same problem, I can only advance by manually selling which cuts a bit of the profit unfortunately.
Has anyone tried to mine over long periods as a way to make money? I just spent about 3 days mining to find a pink diamond and made well over 100k from it, gigantic space rocks you find from rabbit hole tunnels are worth 30k+ a piece. Maybe I just got lucky, but that sim is a sculpter and I was impressed by how a couple holes got me more money than I would get in a week of sculpting.