Ball Mills. Ball mills have been the primary piece of machinery in traditional hard rock grinding circuits for 100+ years. ... For example, it takes approximately 3 times as long to achieve 200 mesh grind as it does to achieve 65 mesh grind. ... Price Videos Drawings 3' x 6' $49,940 Ball Mill Videos: 4' x 8' $91,680 5' x 10' $152,940 We bought ...