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Mario Torres Lopez, 42, was working at a depth of about 100m (328ft) when the mine collapsed.
BBC: Chile slow search for miner trapped 100m underground
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Valarmadhy inches forward, using small tools to clear a strip 1m (40in) wide, digging down to 6in - the accepted safety depth - to ensure there are no mines between herself and the nearest visible mine.
BBC: The women clearing Sri Lanka's mines
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The San Jose mine collapsed on 5 August 2010, cutting off the miners at a depth of more than 700m (2, 300ft).
BBC: Chile marks year since mine collapse
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According to Golborne, the first stage of drilling on Plan B has reached a depth of 1, 640 feet (500 meters) and will pierce the ceiling of the mine shaft where the men are trapped this weekend.
CNN: STORY HIGHLIGHTS
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Baker said that the rehabilitation process has reached a depth of 1, 500 feet, which is about 25% of the total workload required to bring the mine back up to safety standards.
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