This place is quite interesting, if anyone can give me some more ino I'd be very greatful.
The material extracted is actually a riveable form of sandstone, though to quarrymen this is known as slate - as it can split just as thin, and well. 😉
There appear to be five different levels - only one of which has much length, although I think that another one in the North workings could be cleared in a few trips.
Kein geneis kanaf - Cain gnais canaf
Byt vndyd mwyhaf - byth onddyth moyav
Lliaws a bwyllaf - Líows o boylav
Ac a bryderaf - ac o boryddarav
Kyfarchaf y veird byt - covarcav yr vairth
Pryt nam dyweid - poryth na'm dowaith
Py gynheil y byt - Pa gonail y byth
Na syrch yn eissywyt - na soroc yn eishoyth
Neur byt bei syrchei - nour byth bai sorochai