What Happened to the Coal Industry in South Wales?

I ben, in a way, what happened? What happened in wales under thatcher with the well. And isn't it right that there are some former coal mining communities in south wales where unemployments incredibly high and people on sickness benefit is incredibly high? I mean, to the extent that anything was brought in to replace he coal minesd and other really major heavy industries, was a bit of light industry, warehousing and sort of service sector jobs That operate kind of on kind of a sort of gig economy model with low wages and, you know, flexible employment.