posted on Mar, 5 2008 @ 06:03 AM
I lived in that exact area during the early 80's and know the hill you are taking about, the hill in question is a volcanic basalt upthrust, totally
natural and very big, there are no mines in that area just small open quarries and slate pits,
I did a lot of geological work in that area if my mind serves me right it is the bigest hill around there until you reach a small village called
cwillog which is to the east, then you come into the main range of Snowdonia, In fact i would say the pwhelli area right up to the north on the irish
sea is the run off for the snowdonia mountain range very beautiful countryside.