From Blaenau (Bethania), drive up Manod Road to the very top. Then take the footpath to the North East which takes you to Diffws.Chris.
From Blaenau (Bethania), drive up Manod Road to the very top. Then take the footpath to the North East which takes you to Diffws.Chris.A much shorter route would be via the road from Bethania.
As I understand it, they are going to work downwards from the pit untopping as they go to recover the slate from the pillars.