Mae'r cwcis hyn yn gwbl angenrheidiol ar gyfer weithrediad y wefan.
Rydym yn defnyddio Google Analytics i fesur sut ydych yn defnyddio'r wefan er mwyn i ni ei wella yn seiliedig ar angen defnyddwyr.
Gall y cwcis hyn gael eu gosod gan wefannau trydydd parti a gwneud pethau fel mesur sut rydych yn gwylio fideos YouTube.
Amgueddfa Cymru
This video was originally produced in 1982, just after Big Pit closed as a working mine and just before it opened as a museum. Intended as a short introduction to the mine complex before visitors took the underground tour, it contains views of the lamproom, the pit top and winding enginehouse, various coal faces and pit pony stables, the pithead baths and surface workshops. Video narrated by Windsor Davies. Running time 13 minutes.