CRUSHING & GRINDING CIRCUIT

The crushing circuit begins with a large Primary jaw Crusher. The crusher is 28.5" x 16" and can accommodate material that is up to 8" in diameter. The Primary Crusher will reduce the material to 2" diameter. The 2" material is then elevated to a holding bin located above a Secondary Crusher that is 18'' x 12" and can handle material up to 4" in diameter. The material is screened to a size of -40 mesh to remove any fines from the circuit. A conveyor belt then moves the course material over a magnetic head pulley to remove any tramp steel and deposits the balance of the material into the Secondary Crusher.

The material drops directly from the Secondary Crusher into a "Symonds" 2' Cone Crusher which further reduces the size of the material to about 1/4" in diameter. The material is again screened to -40 mesh to remove any additional fines from the circuit.

The entire crushing circuit is kept clear of dust particles by a dedicated collector system that removes all airborne dust through pickup hoods located at each section of the process. The dust or "fines" are periodically sent to the grinding circuit and are included in the total amount of material that is reported in the production lot.

The crushed material exiting the Symonds Cone Crusher is fed into a 3' x 5' Krupp Ball Mill. The ball mill is entirety encased in a dust collector system and has the capacity to grind one ton of material an hour from 1/4" in diameter down to -40 mesh. The mill is equipped with a series of internal screens that permits -40 mesh material to exit the mill. The oversized material is further screened and classified to remove any metallic scales and the balance of the material is ground to size.