Concern is growing over the future of jobs at Unity Mine - one of Wales' largest drift mines.
It follows a day of talks between the NUM and management of the mine in the Neath Valley, where around 200 people work.
The General Secretary for the NUM in South Wales, Wayne Thomas - who attended a meeting with Unity Mine managers this afternoon - said afterwards that there was uncertainty, but there had been no talk of the mine closing.
He added that there is likely to be a statement tomorrow on consultations over possible job losses and the mine's long-term future.
More top news
A mother-of-three has escaped jail after claiming benefits as a single mother - when she was living with her husband.
As one road safety charity calls for tougher punishments for those who break the law, we're asking you for your opinion on the issue.
Wales international Eli Walker has signed a new deal with the Ospreys, keeping him at the Liberty Stadium until the summer of 2017.