"The potential investment and returns for that investment are huge in this particular mine" says Wayne Thomas, from the National Union of Mineworkers.
"The access is already there, and the working methods could be adapted slightly.
"But the investment returns are there for the longer term, and I think there's stability there... for these individuals in South Wales who want to work in coal mining."
More top news
In this clip from 1959 Father Christmas gets some very practical requests for Christmas Day.
Political Editor Adrian Masters looks back at an extraordinary year of change for Welsh politics
Research by Hybu Cig Cymru has found the tradition of families sitting down to a roast dinner is dying out, declining by 8.4% a year.