In the Tory Brainstem It doesn't matter that all those miners were made redundant and were forced to drop their newborn children into the nearest river and sell their wives into prostitution, It only matters that she was able to claim victory and further piss allover the UK unemployed.
There was no national strike vote so the strikes were illegal. Many miners did not strike so the planned energy crisis didn't happen. Thatcher just applied the laws, most people to not support union mobs.
The coal mines had been nationalized, so the government had to keep subsidies down. They planned to close 20 mines with 10% lost jobs. The strike made them worse off.
The mines were privatized because they were a money sink. North Sea gas made coal useless. Climate treaties did the rest, there are only a handful of mines left.