Rock Crushers - Gold Rush Trading PostElectric or gas powered rock crushers for larger amounts of gold bearing rock. Portable Rock Crusher Lightweight, portable rock crusher. Perfect for testing rocks.portable rock crusher,Cobra Crusher, portable rock pulverizer demoSep 2, 2014 . Crush rocks and find Gold! We tested out the Cobra Crusher portable rock crusher that bolts onto any angle grinder. You can take this unit into.