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
The Conservative's annual conference is getting underway in Manchester, and talk has turned to next year's Welsh election.
A band of showery rain will push through overnight, but it will feel mild.
Gwenllian Davies was born in 1905 and has been described as 'wise, well-read and witty'.