Silica
The most significant silica mines are the Glenshera sand pit near Mount Compass, 50 km south of Adelaide, and the 23Mile lump silica deposit near Whyalla. 2013 production of glass and foundry sand was 476,000 tonne, dominantly from the Glenshera mine area. Production of crushed quartz from the 23Mile quarry was estimated at 26,000 tonne.