On August 5, 2010, the roof of the San José copper-gold mine collapsed, leaving 33 miners trapped underground.
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The San José Mine is about 45 kilometers (28 mi) north of Copiapó, Chile. The miners were trapped at approximately 700 metres (2,300 ft) deep and about 5 kilometers (3.1 mi) from the mine entrance. The mine had a history of instability that had led to previous accidents, including one death. A government report from July 2010 warned that the mine owners had failed "to reinforce the roof ...". The lack of reinforcement "had led to [an earlier] collapse of the roof." There has been controversy over why the mine was not closed down earlier.