ITV News understands that the owners of the Unity Mine in Neath are filing for administration.
Around 200 people currently work at the site.
Local AM, Gwenda Thomas, told us: "It is extremely regrettable that Unity mine has gone into administration."
I sincerely hope that the administrators can find new owners for the mine, and preserve the miners’ jobs and the future of the apprentices. Welsh Government officials continue to be in discussion with the mine.
More top news
Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.
A paddle steamer has sunk off the north Wales coast while it was being towed towards Northern Ireland.
The heavy rain will ease overnight, with mist and mild temperatures!