Slate Museum, Llechwedd Slate Caverns, Talywaenydd, Blaenau Ffestiniog, Gwynedd, LL41 3NB
Diwygiad ansylweddol i gais C23/0329/03LL i gynnwys ychwanegu grisiau tân allanol, ail leoli storfeydd allanol, lleihau ardal gwydr yn yr estyniad sy'n cysylltu'r hen a'r newydd, ychwanegu ffenestri, ffenestri to a drysau, addasu dyluniad y porth mynediad a dyluniad to yr adeilad newydd Non-material amendment to application C23/0329/03/LL to include the installation of external fire escape, relocate external stores, reduce glazing in the link extension connecting the old and new, additional windows, roof light and doors, alterations to porch design and roof design of the new building