[1] Colliery development began in 1884 by Plymouth Estates,[2] later to become the Ocean Coal Company,[3] with many of the early workers from Davies home village of Llandinam, Montgomeryshire.
[3] This spurred Davies purchase of the rival Harris-owned Deep Navigation Colliery in 1893, which from 1914 for a period provided electricity supply to Lady Windsor.
[3] Post World War II, nationalisation took place on 1 January 1947, but the returning miners wanted better conditions, and many choose to commute to work at the newly developed Treforest Trading Estate.
[2] In March 1975 it was linked underground via two parallel tunnels with Abercynon Colliery,[1] which was situated on the other side of the mountain, to form a single production unit at a cost of £450,000.
[3] The Lady Windsor Lodge assumed a leading role in the 1984/85 UK Miner's Strike, but on return to work the unit managed an impressive recovery obtaining 98% of expected output within a month.