A ball mill is a type of grinder used to grind, blend and sometimes for mixing of materials for use in mineral dressing processes, . Additionally, ball milling has been shown effective for production of amorphous materials. . it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer,.
A stamp mill is a type of mill machine that crushes material by pounding rather than grinding, . They usually are arranged linearly, but when a mill is enlarged, a new line of them may be . Such mechanically deformed anvils have been found at numerous Roman silver and gold mining sites in Western Europe, including at.