I smelt, mix alloys, and cast ingots with an 8" dutch oven. It'll safely hold in excess of 90 lbs... if I thought my turkey fryer burner frame could handle the weight, that is.
I can use a 2 lb Rowell to scoop out all but the last 1.5 lbs of alloy. At that point, I dump it by hand.
The same goes for my Lyman Big Dipper. I can use all but about the last 1.5 lbs of alloy. Again, I pick it up and dump it, if I need to empty it. (I really wish I could afford to pick up a few more furnaces to for dedicated alloys.)
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."