When a rock has values in it, its then called ore. In order to liberate the minerals, it needs to be crushed down. In days of yore, a stamp mill was the primary form of crushing rock, but in the modern world, there are jaw crushers, impact mills and gyrator crushers, as well as ball mills. They all have their own pros and cons -- and price tags. Mineral Rocks Ore Crushing Machines. Stedman impact crushers, mills, and grinders are used in nearly every mineral, ore, and mining application.Whether you are processing iron ore, coal, rock, salt, wood chips, or clay to name a few we have your solution to size reduction. Grinding Gold Cryogenic One Ton Nano Partikel Rock Crusher Machine Cast Iron Balls Diesel Ball Mill , Find Complete Details about Grinding Gold Cryogenic One Ton Nano Partikel Rock Crusher Machine Cast Iron Balls Diesel Ball Mill,For 900x3000 Grinder Electronic Waste Gold Machine Stone Grinding Limestone Mining Balls Rolling Media 10tph Roller Ball Mill,Alpha