I don't see any reason to delete it. I lived in a coal mining area and that's the way things were. I believe safety improved after nationalisation but that work always was, and still is, dangerous. The Chinese seem to have regular incidents.
My father was in mining during WW2, shot-firing amongst other things, and had some horrendous tales when you could drag them out of him. The 'Bevin Boys' thought the Services were a safer bet re: survival.
I actually got a job as an Apprentice Electrician with the NCB but, as I was not 18, he had to sign the papers. He tore them up and put them on the fire in front of me. He said what you do when you're 18 is up to you, but no way will I sign them. There ended my career with #5 Area NCB.
Subsequent events proved him right. Thanks Pop ...

Best Wishes to you, Norman. Keep up the good work.
Dave