A stamp mill is a type of mill machine that crushes material by pounding rather than grinding, . so some stamp mills are located near natural or artificial bodies of water. . They were common in gold, silver and copper mining regions of the US in . Ball mill a horizontal cylinder containing metal balls to crush the material.
A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing . The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates.