


Stamp Mills for Processing Gold Silver Copper Ore - LOOK WHAT WE FOUND !!! Working Stamp Mill with Tons of Gold …
A karat marking followed by 'P' indicates that the piece is plumb, meaning the purity is exact. For example, '10KP' is exactly 41.7% gold. Federal law allows the stamp to deviate .5 karats from the exact purity, so a '10K' stamp could be as low as 9.5 karats, but the plumb stamp guarantees the exact 41.7%.The Interior. "Clean Up" day at the Deadwood Terra Gold Stamp Mill, one of the Homestake Mills, Terraville, Dakota.
