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
Grupo México to the possibility of huge gas concentrations, there are certain theories that indicate the mine has an important lack of safety rules, very similar to the problem presented in the Sago Mine disaster in West Virginia with the accident that caused death of 12 miners on January 2, 2006. Union critics of the company openly refer to the incident as a "homicide." After the successful rescue of 33 trapped miners in October 2010 in Copiapó, Chile, the case gained popularity again, and many people including bishop Raúl Vera demanded that the case be reopened. Grupo México has not responded. According