My grandfather, all my uncles, my father and most of the adults in my hometown all worked in the coal mines. That's about the only work available if you lived in that part of Southern Illinois during that time. When I was in high school, Standard Oil bought out Old Ben Coal Corporation and the children of employees of Standard Oil were invited to take a test and compete for a college scholarship. The only catches if you won were you had to go to one of a handful of schools that they found acceptable and you had to major in either Mining Engineering, Geology, or Electrical Engineering.
The scholarship was $1000 per semester which didn't come close to paying everything. But it paid tuition and fees and bought my books and gave me a start on my first month's rent back then. By working 10 hours a week in a bookstore and 10 hours washing dishes, plus working in the mines during Summer breaks, the $1000 scholarship made going to school look better than working full-time in the mines.
The coal mine gig in the Summer was a good deal. I made far more money doing that than most other things I could do. Coal mining isn't back breaking work today like it was in my grandfather's day. You do have to work 500 feet underground. That drives some people crazy. I saw two different people loose all sanity just from their first ride down in the cage. It took several people to hold them down long enough to get them back out to the top. Their coal mining career ended before it ever started. The underground aspect didn't bother me, but it was a filthy job. You came out of the mine after every shift completely covered in coal dust -- head to toe and in your ears and nostrils. Everyone looked like they had been spray painted black.
If you live in a low cost-of-living area like Southern Illinois, the coal miner's pay is pretty good. And the UMWofA has a very generous medical benefit and pension plan. Renegotiation of contracts and strikes were always scarry, but a sensible person with a frugal approach to life could do okay and take care of his/her family as a coal miner.
Loretta Lynn? I was mostly a rebel growing up -- more into head banger heavy metal and I definately turned my nose up to country music. I rediscovered country music long after I left the mines. Loretta Lynn is alright. She accomplished a lot when you consider where she came from.