Inspectors will look at electrical installations as well as methane and coal dust controls, including ventilation and the spraying of powdered rock to dilute explosive coal dust.
The coal association says many companies already had stand-down days on April 6, the day after the deadly blast, or on Monday, when the state paused for a moment of silence.
"Safety is of absolute importance," Raney said, "so they intend to honor that and bring proper attention to their support for the families and the victims."
Each mine will have its own plan for today, he said. Some will work on training and maintenance, while others will focus on safety refresher classes.
Janine Orf, spokeswoman for St. Louis-based Patriot Coal Corp., said her company will have multiple underground-safety activities.
International Coal Group employees will participate in safety talks, then work "on a variety of duties that focus on safety and mine maintenance improvements," spokesman Ira Gamm said.
All ICG operations in West Virginia, Kentucky, Illinois, and Maryland conducted a safety stand-down April 6 to undergo several hours of additional training that focused on methane risks, coal combustion dangers and other mining hazards, he said.
Consol Energy also will spend today reflecting on safety, said spokesman Joseph Cerenzia.
In 2009, Pennsylvania-based Consol produced nearly 32 million tons of coal from seven mining complexes and had about 3,500 employees in West Virginia.
Cerenzia said employees will attend safety refresher classes and be briefed on Consol's "Absolute ZERO" safety initiative, started two years ago in an effort to eliminate all injuries.
The company would not comment on any possible financial impact.
"As we've stated previously," he said, "at Consol Energy, safety trumps everything -- production, profits, revenues."