Definitely the late Rita MacNeil's "Working Man".

http://www.youtube.com/watch?v=E-EiwiiAh68

Chorus

It's a working man l am
And I've been down under ground
And I swear to God if ever see the sun
Or for any length of time
I can hold it in my mind
I never again will go down under ground

At the age of sixteen years
Oh he quarrels with his peers
Who vowed they'd never see another one
In the dark recess of the mines
Where you age before your time
And the coal dust lies heavy on your lungs

Chorus

At the age of sixty-four
Oh he'll greet you at the door
And he'll gently lead you by the arm
Through the dark recess of the mines
Oh he'll take you back in time
And he'll tell you of the hardships that were had

Chorus

(Repeat Chorus)

(Repeat Chorus)

God I never again will go down under ground