Naoma, West Virginia (News Terupdate) - Federal authorities were determined late Thursday to resume the search in a West Virginia coal mine where four miners may be trapped after a deadly explosion earlier in the week.
Kevin Stricklin of the U.S. Mine Safety and Health Administration said rising barometric pressure in the area has helped reduce levels of dangerous gases in the Upper Big Branch mine. Stricklin said air sampling would continue every 15 minutes.
He said if the trend reverses and gas levels go back up, crews were ready to pump nitrogen in to neutralize the air and reduce the chances of an explosion.
"If the trend is continuing downward, everyone is in agreement to send rescue teams back into the mine," Stricklin said.
Rescuers had been using high-pressure fans to pull the toxic air through 1,100-foot holes to the surface Thursday.
At least 25 miners died in Monday afternoon's explosion at the Upper Big Branch Mine in southern West Virginia, while four others remain missing and two were injured.
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Rescue crews had been pulled from the mine Thursday morning because deteriorating air quality posed the threat of a new blast, officials said.
Source : CNN
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