The latest results were also hit by an engineering disaster at the Daw Mill colliery in Warwickshire, where efforts to construct new tunnels were hamstrung by ground instability. UK Coal said this contributed to a production shortfall of 600,000 tonnes at Daw Mill. Output was also restricted at the Rossington colliery in South Yorkshire due to industrial action, while geological troubles at Thoresby colliery in Nottinghamshire led to lost production there of 330,000 tonnes.