A ball mill is a type of grinder used to grind, blend and sometimes for mixing of materials for use in mineral dressing processes, . until the industrial revolution and the invention of steam power that an effective ball milling machine could be built. . The ball mill can grind various ores and other materials either wet or dry.
In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the . The process of panning and sifting for gold uses both of these methods. . a trough used with some ore dressing machines and the keeve or kieve, . gyratory crushers and cone crushers whereas rod mills and ball mills, closed.