I ran into a couple big anchors that my Uncle's gave me.
But James gave me a big cast iron pot as well.
So, I stoked a big campfire and put the pot down in the fire and had at it.
Used a big ladle I made from a 2" pipe cap and a 3' rod and a custom ingot mold made from 1-1/2" angle iron and poured out a bunch of ingots.
Your chunk may have fit in the pot.
How much did you net on that brick?