This Unit will handle rock up to 1" and Pulverize it down to a minus **0 mesh on first pass and ***0 mesh in a few passes the size of talcum powder depending on material. There are 2 outlet for ore removal the top allows you to use the vacuum system (provided with unit) to remove the ultra fine material, and the bottom allows you to run your material wet which would pass thru the screen ready to concentrate. Great for PC and computer parts.