SAG Mill Grinding Circuit Design - 911 MetallurgistJun 6, 2016 . Such mills are common in South African operations; mills are sometimes referred to as tube mills or ROM ball mills and are also operated both autogenously and semi-autogenously. Many of these mills operate at higher mill speeds (nominally 90% of critical speed) and often use “grid” liners to form an.how does the sag mill works,SAG MILLMay 21, 2010 . 40 foot SAG-mill walk-around. . SAG MILL. Info. Shopping. Tap to unmute. If playback doesn't begin shortly, try restarting your device. Your browser does not currently recognize any of the video formats available. Click here to visit our frequently asked questions about HTML5 video. Share. Include playlist.