Development
David Davies began test bores in the early 1880s at Graigddu (English - Black Rock), which proved positive. Colliery development began in 1884 by Plymouth Estates, later to become the Ocean Coal Company, with many of the early workers from Davies home village of Llandinam, Montgomeryshire. The shafts Nos.1 and 2 each 689 yards deep, with the first coal produced in 1886.
As with most coal mining areas in the South Wales Coalfield, a local community immediately sprang up around the colliery at Ynysybwl. 300 houses were built in typical South Wales Valleys terraced fashion by the mine owners in order to house workers and their families, with most built on the opposing (Western) side of the valley.
Read more about this topic: Lady Windsor Colliery
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