An employee was pouring molten lead into molds. When lead solidifies, the lead is removed from the mold using an eye bolt and chain attached to a bolt that is poured into the lead cylinder. The employee attempted to lift the lead cylinder from the mold, but the mold was stuck to the lead. The employee attempted to clean the surface of the floor underneath the mold using his hand while the mold and lead cylinder were suspended in the air. The mold released from the lead cylinder and struck him in the right thumb, amputating the thumb behind the thumb nail.