Glossary of Mining Terms

 

    
   

Sag Mill


The SAG mill is a large revolving cylinder containing steel balls.  Rock is ground by the turning action of the mill, and impact from the hardened steel balls and the rock itself.

In order to ensure that the rock is ground finely enough the SAG mill has a trommel screen which acts like a large sieve.  The oversize rock is caught by the trommel, along with the worn hardened steel balls.

This material is fed past a magnet to separate out the steel balls. The oversize rock passes through the crusher prior to passing once again into the SAG mill for further grinding.

  
   
   

About Precious Metals.com 2005