In 1850 the Troedyrhiw Colliery (later to become the Aber-Rhondda Colliery), which was sunk on the northern borders of Porth and the neighbouring village of Ynyshir by Leonard Hadley of Caerleon five years earlier, came into the ownership of a new consortium known as the Troedyrhiw Coal Company. This company was formed by James Thomas, a former miner, Matthew Cop, a Cardiff docksman and John Lewis, a grocer from Aberdare. In 1852 the same company opened the Tynewydd Colliery at the junction of the Rhondda Fawr and Fach rivers, Porth's fourth mine. The mine quickly struck the Rhondda No. 3 seam, and coking ovens were built at the surface, providing further employment.