Being able to grind and pan your ore is invaluable. An assay will only tell you what's in a very small amount of rock.  It doesn't tell if that gold is recoverable. When you can crush and pan rock. You get the information you need. If you can pan your ore and see gold in your pan. You know that the gold is recoverable with gravity collection equipment.  Do several test and you will know if its worth your time and back breaking work.

Cobra crusher along with a metal detector is a great tool for exploring old mine dumps. If you have black sands you think might be hiding more gold cobra crusher can quickly grind them down. Do other prospecting enthusiast show you rock they think might have gold in it. Your Cobra crusher can give the answer.

All steel construction with replaceable parts. Put in new chains and change out an old bearing. The Cobra Crusher works by attaching to a standard Angle Grinders (NOT included). Cobra portable rock crusher will quickly grind your samples down to powder! Recommended minimum power is 7 amps at 11000 rpm.