WASHINGTON, D.C. -- When GOP presidential candidate Mitt Romney visited an Ohio coal mine this month to promote jobs in the coal industry, workers who appeared with him at the rally lost pay because their mine was shut down.

The Pepper Pike company that owns the Century Mine told workers that attending the Aug. 14 Romney event would be both mandatory and unpaid, a top company official said Monday morning in a West Virginia

.

A group of employees who feared they'd be fired if they didn't attend the campaign rally in Beallsville, Ohio, complained about it to WWVA radio station talk show host David Blomquist. Blomquist discussed their beefs on the air Monday with Murray Energy Chief Financial Officer Rob Moore.

Moore told Blomquist that managers "communicated to our workforce that the attendance at the Romney event was mandatory, but no one was forced to attend." He said the company did not penalize no-shows.

Because the company's mine had to be shut down for "safety and security" reasons during Romney's visit, Moore confirmed workers were not paid that day. He said miners also lose pay when weather or power outages shut down the mine, and noted that federal election law doesn't let companies pay workers to attend political events.

Moore said he didn't see anything negative in attending Romney's campaign appearance with U.S. Sen. Rob Portman and Ohio Treasurer Josh Mandel.

"We are talking about an event that was in the best interest of anyone that's related to the coal industry in this area or the entire country," Moore said in the radio interview.

When contacted about the interview on Monday afternoon, Murray Energy spokesman Gary Broadbent emailed this statement: "Rob Moore made it abundantly clear that no employees were forced to attend the Romney event. All participation was, and always has been, completely voluntary."

Blomquist said that he got multiple emails and phone calls from Murray Energy workers who felt that they were intimidated into attending Romney's appearance. He said employees were told they'd have to forfeit the day's pay unless they could make up their missed hours on overtime or weekends.

"My whole point is that nobody should be pressured into attending anyone's political event," Blomquist told The Plain Dealer. "If they shut the mine down, why should they lose a day's pay? There are some guys that just want to go to work, feed their family and go home."

Romney used his appearance at the coal mine to blast what he called a "war on coal" by the Obama administration that he said was costing jobs in the coal industry.

"We have 250 years of coal," Romney said. "Why in the heck wouldn't we use it? And so, I want to take advantage of those energy resources."

A Romney campaign spokesman did not respond to a request for comment from The Plain Dealer Monday afternoon.

Records compiled by the

show that Murray Energy has contributed more than $900,000 to Republican candidates in the last two years.