Grinding Balls - Moly-CopExperience Counts. Moly-Cop has been manufacturing grinding balls since the 1920's. With ten manufacturing sites strategically located in key mining regions, we have flexibility and product quality to meet the needs of modern milling operations. Our grinding balls have low industry wear rates, providing our customers with.grinding ball mill fabriors for mining,Grinding Mills | Westpro MachineryGrinding Mills. Westpro's heavy duty grinding mills are designed for durability and excellent grinding performance in mining applications. 6ft Diameter x10ft Ball and Rod Mills at the Westpro Shop.