Hi Tommy,
I know what you mean about residue.
My grandparents and great grandparents were miners in the welsh valleys.
My dad managed to break the chain by finding a job in London.
I have 2 small suggestions which you can keep or sweep:

1."Came home at night and worked many more" may be harder hitting as,
"Came home one night and worked no more", although maybe not historically accurate if personal to you.
2. Where you go into the F chord in the chorus on "shines" there seems to be a mismatched note somewhere there to my ears.
Then again it may be my ears.

Good song, sung and mixed with the right amount of feeling.

Vic