Shortwall continuous mining as first introduced at Burwood colliery, and currently being used at John Darling, Lambton, and Corrimal collieries, is a method of coal winning which was pioneered in the Newcastle district. The system uses individual hydraulic self-advancing chocks for roof support and the coal winning operation is by continuous miners and shuttle cars. Where physical conditions are suitable the system provides a safe, efficient and economically viable basis for pillar extraction. Shortwall operations have been conducted successfully in the Victoria and Dudley seam, near the coastal fringe of the Newcastle district and are now being tried out in the more difficult conditions of the Bulli seam in the Illawarra district.