A crusher is a machine often used by prospectors to test for gold and other valuable minerals and metals in rocks where gold is not easily visible on the surface. This gold once liberated from the host rock can be removed with something as simple as a gold pan or one of our other fine gold recovery tools. Rock and Ore Crushers listed below are.Keene Gas Powered Rock Crusher. $9,344.50. Keene Gas Powered Rock Crusher delivers extra force for the hardest rocks, using its 11 HP Honda Engine. This 3 stage crusher is every miner’s dream. SKU RC46. Call now to order (855) 721-7699.