Oh, you meant improving the quality :) You need to be more precise! :) My best result right now is two premium slots. 2 iron, 2*25 tin and 625 copper. I don't have enough stock for 125 tin yet. Very much not enough :)
Anyway, with bronze bar crafting taking 1h - I'm thinking about freezing Mine until it would be fixed.
First I need to stop progression and wait to accumulate granite for ~6 hours, but now after it I need to wait ~12 hours to craft bars just to return to the place where I was before prestige.
