No decision has been reached on the future of the Unity Mine at Cwmgwrach in the Neath Valley - despite a second day of talks.
There are fears that as many as 150 jobs are under threat - that's three quarters of the total workforce.
Wayne Thomas, from the National Union of Mineworkers, told ITV News talks will remain 'ongoing' with senior management figures over the next few days.
More top news
All primary and secondary schools in Wales have been categorised in a new colour-coded system. Is your school green or red?
A yellow warning for snow and ice on Thursday night and Friday has been issued.
Some wintry showers and staying windy with a significant wind chill and widespread frost developing