A report from the Chilean Government from July 2010, said that the owners of the mine did not "reinforce the roof." The lack of reinforcement "led to an earlier collapse of the roof". - I did not find any reference, the EnWP articles has the almost same statement, also unreferenced. If this is a government report, it should be accessible, so it could be referenced here? --Eptalon (talk) 13:05, 11 October 2010 (UTC)[reply]