2010 Copiapó mining accident San Jose Mine were around 20% higher than at other Chilean mines due to its poor safety record. The collapse occurred at 14:00 CLT on 5 August 2010. Access to the depths of the mine was by a long helical roadway. A group nearer the entrance escaped, but a second group of 33 men were trapped deep inside. A thick dust cloud caused by the rock fall blinded the miners for as much as six hours. Initially, the trapped miners tried to escape through ventilation shafts, but the ladders required by safety codes were missing. Luis Urzúa, the duty shift
Vorkuta mine disaster million tons of coal and making up 27% of the company's output. On 25 February 2016, two explosions occurred within the mine, setting off a partial collapse of the mine and killing four miners while trapping twenty-six; eighty-one other miners were evacuated safely with minor injuries. The explosions, occurring about below ground and occurring about an hour apart during the afternoon, were believed to have been started by the ignition of a methane gas leak. Rescue efforts for the trapped miners began promptly, with at least 500 people involved. Efforts were hampered by Vorkuta's remote location within the Arctic Circle,