Charleston, W. Va. ? Gov. Joe Manchin called for all coal companies in West Virginia to shut down for safety checks after two more mine workers were killed Wednesday in separate accidents.

While Manchin’s call was voluntary, he also ordered the state’s mine inspection schedule speeded up so that all 229 surface and 315 underground mines are examined by regulators as soon as possible.

“We’re going to check for unsafe conditions, and we’re going to correct any unsafe conditions before we mine another lump of coal,” Manchin said.

He was later joined by David Dye, acting U.S. assistant secretary of labor for mine safety and health, who urged coal mines nationwide to discuss hazards and safety precautions with workers on Monday.

“I am asking miners and management at every mine operation to do the right thing: take one hour out for safety’s sake this Monday,” he said in a statement.

Both deaths Wednesday occurred at mines in southwestern West Virginia. One miner was killed in an underground mine when a support popped loose. And a bulldozer operator died at a surface mine when the vehicle struck a gas line and sparked a fire.

The deaths brought to 16 the number of mining-related fatalities in West Virginia since Jan. 2.

It was not immediately clear how much a shutdown might cost the industry, said Bill Raney, president of the West Virginia Coal Assn.