Massey has been using public forums to express its differences with the MSHA, its chief regulator.

FORBES: Massey Margins Pinched By Mine Safety, Stock Slippage Ahead

According to MSHA, 18 managers at Performance Coal and Massey Energy refused to testify in the investigation.

FORBES: Massey Energy Employee Guilty of Obstruction, But Where Was Management?

Hecla has received approval from MSHA to remove the loose material from the shaft, said Phillips S. Baker Jr.

FORBES: Hecla Officials Anticipate Clean-Up Of Mine Shaft Can Begin In Few Weeks

Most of the citations issued by MSHA to UBB in the last year were resolved on the same day they were issued.

FORBES: Massey Cited For Not Reporting Accidents

Having a fragile relationship with the MSHA can lead to increased costs because of increased MSHA inspections and delays which could slow down production.

FORBES: Massey Margins Pinched By Mine Safety, Stock Slippage Ahead