Bobbie Pauley, the only woman who worked underground at Upper Big Branch, said she was not surprised by MSHA's revelation.
"You put in an inspection report what you wanted the inspectors to see," said Pauley, who lost fiance Howard "Boone" Payne in the blast.
"Zero, zero, zero deters MSHA from coming back. If they see a potential problem recorded in a book, then they're going to come back and investigate it time after time after time," she said. "Well, no coal operator wants to be pounded by MSHA every day.
Pauley returned to Upper Big Branch only briefly after the explosion and now works aboveground at another former Massey operation bought out by Alpha. She was among some 200 people attending Wednesday's briefing.
MSHA has drafted its final report but told victims' families it likely won't be delivered until October.
The explosion also remains the subject of a criminal investigation by the U.S. Department of Justice, and MSHA has said it won't release some information to avoid hindering that probe. It largely reiterated its past public statements, offering more detail but no new theories.
So far, only one Massey employee has been indicted. Security chief Hughie Stover is charged with three federal crimes for allegedly lying to the FBI and MSHA and obstructing justice by ordering a subordinate to throw away thousands of pages of security documents from the mine.
MSHA contends the explosion started with a small, naturally occurring release of methane or natural gas that was then fueled by coal dust into a devastating inferno that tore through the mine in a series of explosions over a few minutes. The agency has blamed a poorly maintained cutting head on a piece of mining equipment for sparking the blast and a malfunctioning water sprayer for failing to douse it.
An independent investigation commissioned by former Gov. Joe Manchin reached the same conclusion last month.
That study accused Massey of ignoring the most basic safety practices in the industry, allowing highly explosive coal dust and methane gas to accumulate, and failing to provide either enough fresh air flow or enough pulverized limestone on the mine's walls to render coal dust inert.