That mandate didn't extend to destroying the communities around the pits once she beat the unions. She was a public servant like all politicians, not some tyrant enacting revenge on those who dared to stand up for their livelihoods. Shutting down the pits wholesale and then leaving whole communities to rot was not in her job description.
Every government since thatcher had a chance to do something about it. Blair could have done that instead destabilising the middle east for another 15 years.
sorry but 30 years on even i can't honestly say 100% it's all thatchers fault.