Ball Mill Girth Gear repairs    Cast steel Girth gear initially had a relatively small fracture which was welded.  Weld failed almost immediately and fracture grew from there. Metalock of Australia P/L was called in to make long term repairs. Repairs carried out internally and externally. Weld caused localized hard spots requiring drilling with carbide drills in different pockets / areas.  Production demands were high – repairs carried out in good time and unit is still in use.