Pen-y-llan No.5 shaft Llwynymaen Colliery in the Morda Coalfield. Mining in this area started well before the 1800. In 1798 there were at least 140 colliers at the Llwynymaen Colliery. In 1830 the concern was in the hands of Thomas Ireland & Co. and they operated the colliery until about 1840 when it flooded.