Small adit in a rock outcrop beside the Llan Ffestiniog to Ysbyty Ifan road. Very wet ground. Fenced with a small ‘danger’ sign.

Comment from user Blober (2026):

This “mine” is hilarious, someone has gone to the effort of putting up a fence with a “danger, old mine” sign when the adit doesn’t even go in further than maybe 2-3 feet. We genuinely couldn’t fathom this one out.