/industries/otherindustries/metals-mining/b/weblog/posts/move-toward-zero-unplanned-downtime-on-a-primary-crusher-555557397Douglas Morris Author: Douglas Morris Primary crushers are the start of the comminution process at mine sites. Before ore is delivered to the mineral processing plant, it is typically processed through a cone crusher where it is reduced in size toen-USTelligent Community 13