Casdon
Blast furnaces in steelworks used Coke, which was from domestic coal Monica, they were all around in South Wales. Steel making in the UK effectively died at the same time as mining.
The coal measures in South Wales are relatively low sulphur but the coal field suffered from significant faulting and narrow coal seams, which made it difficult to introduce mechanisation, so the coal was expensive to produce.
The steel industry has always tended to stay close to its necessary raw materials; iron ore and coal, staying close to the coast for importing ore and also to the coal measures.
Unfortunately it gradually became increasingly uneconomic to produce steel in many dveloped countries. Other countries had purer and larger deposits of iron ore, and coal that was also more easily mined, but even if the steel manufacturing is South Wales had continued, the coal industry would still have died because of the difficult geology of the coal measures.
Wyllow3 I knew nothing about it until I went on the Liaison Committee.