Hard. As. Fuck.
Almost fearless. Grateful for a quiet life now they're out of it.
I know one guy who bought a very small mine in the High Peak which he and a mate thought there was 3-4 years work left in for them. Just them. On their own. Tiny, tiny seam. Off they went. Utterly bonkers.
I grew up in a mill town myself, and all the local towns have stories about kids being put to work and the odd one being killed. My school trips were to Litton Mill, where the working conditions were once so bad there was a Parliamentary enquiry into the child deaths there.
What I'm getting to is, I am unbelievably lucky to live in the age I do where I get to work with my brain, I was able to get a decent education despite relatively modest beginnings and I would never, ever, ever look down on a manual labourer like a coal miner: they were tough bastards.
And it is of course now mostly past tense - not many mines left in the UK, despite there still being plenty of coal down there.