Crushing in Mineral Processing. Dec 26, 2015Since there are not that many small SAG mill operations of under 2000 TPD, and most sub2000 TPD mills are built with rod mills and/or ball mills only; the upstream crusher plant needs to have sufficient crushing power to provide a P80 to grinding of typically ″ (40 mm) and often as finely crushed as 3/8″ (9 mm).