I'm with Chis on this one. If you are already @ 1/4 " , the chain crusher that he is talking about will make short work of taking your material to minus 100 mesh and smaller. Mine is the one that takes 4" and smaller. Only problem that I've had is with really hard ores but with you starting at 1/4" , it will chew up and spit out practically anything you throw in it.----K Rose