Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,415 pages of information and 233,868 images on early companies, their products and the people who designed and built them.
1864 David Davies took a lease of mineral property between Tonpentre and Treorci in the upper Rhondda valley, not hitherto a coal-producing area.
After two years of anxiety for Davies, one of the finest seams of steam coal in the world was struck in the Maendy pit, Cwmparc.
1867 The Ocean Collieries Company was set up to exploit the discovery
1870 New pit sunk at Dare
1877 New pit at Bwllfa.
1887 The Ocean Coal Company was registered on 1 April  as a limited liability company.
By 1900 the Ocean company had four collieries producing more than 1.5 million tons of coal annually, and many other pits had also been profitably established.
The Rhondda valleys were now a booming industrial area, Davies was a millionaire, and Ocean stood second only to Powell Duffryn as a mass producer of quality Welsh steam coal.