Inspectors will enter the Upper Big Branch Mine on Wednesday to monitor air quality, the results of which will determine whether an investigation can begin into the cause of the deadliest mine disaster in the United States in 40 years.
The explosion at the West Virginia mine, on April 5, killed 29 workers.
A 16-member group will enter the mine Wednesday, said Massey Energy, the company that runs the coal mine.
“We are eager to begin a thorough investigation into the root cause of the accident,” said Don Blankenship, company chairman and chief executive officer.
Massey shares have fallen about 40 percent since the explosion and the company also faces the prospect of a criminal investigation.