This is Clogau mine not Foel Ispri. It is a gated and currently looks like it is in use...
Sorry Arthur, I am sure you are mistaken. In the opening shot you can see the Afon Mawddach with Penmaenpool bridge. The shot of the mill also shows the Afon Mawddach.
You are correct in saying Clogau is gated, it has been thus for many years.