About 7 miles north of M4 J28 on the A467.
Turn towards 'Cwmcarn Forest Drive' at the roundabout with the mountain bike art work.
First left takes you into Cwmcarn. At the Cwmcarn pub/post office, turn R into Park St. Then take the third L to a parking spot (not outside houses).
A footpath on the corner leads to a lane between garages, enter the woods and follow the left fork uphill (100m) into the quarry.