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Meter showed 5 percent methane at Montcoal
A federal official says a handheld meter found deep inside the Upper Big Branch mine detected explosive levels of methane before a blast killed 29 miners -- the first concrete evidence of dangerous concentrations of gas ahead of the April 5 disaster.
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Meter showed 5 percent methane at Montcoal
A federal official says a handheld meter found deep inside the Upper Big Branch mine detected explosive levels of methane before a blast killed 29 miners -- the first concrete evidence of dangerous concentrations of gas ahead of the April 5 disaster.
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