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
Assembly members will begin the final stages of making an emergency law to overturn the UK Government's post-Brexit devolution plans
There were 218 against children last year in Wales but there are growing concerns many more are suffering in silence.
On Monday afternoon, numerous Facebook posts claimed a silver Mini had been stolen from the town with a girl in it.