The point is often made that “Labour closed more mines than the Tories”, which is true. However, what’s not considered here is that the closure of 10 small pits has somewhat of a different impact than say the closure of 1 super-pit

Between 1962 and 1978 300,000 jobs were lost leaving about 240,000. who were producing about 55% of that produced in 62.

In 1986 that same 55% was being produced by less than 100,000

In the early 80s companies were subsidised to use british coal and the CEGB was banned from importing it, however it couldn't last costing as it did 1.3 billion pounds annually.

Incidentally Harold Macmillan in the early 60s spoke about the dangers involved in having whole communities dependent on a single large industry, almost prophesising  future events.

One could have thought successive governments would have recognised what might happen and started to put measures in place but they are not noted for thinking that far ahead.