Penmaenmawr town center was being built around this time along with the railway station, here a link of prominent shop and building being built and dates
http://www.penmaenmawr.com/historyPantyAfon.htmlhttp://www.penmaenmawr.com/historyrailway.htmlhere a snippet from the quarry section of penmaenmawr website
Early in the 1850s S.D. Darbishire, a wealthy Manchester solicitor came to reside at Pendyffryn, and soon after his coming he engaged a qualified metal prospector to make a search of his then extensive lands. Some of the trials mentioned here could well have been made on his advice. A level tunneled into the rock just outside the boundary wall behind Pendyffryn could be such a one. The name of the small cottage, Brickfield, the only dwelling on the sea-side of the railway, tells that brickmaking had once been carried on there. It was probably initiated by S.D.D. who wished to make use of the red brick clay on his land exposed by the construction of the railway in 1847/8.
Hope this may help
Emma