Hi Jack. Welcome to Mudcat.
If you type [sixteen tons] - using the square brackets - in the blue DigiTrad Lyrics Search box at the top right you will find the lyrics by Merle Travis. We have also had at least one discussion about this song on the Forum so try a forum search as well. (I don't know if you need to use the  brackets in the forum search, but just try the word sixteen if you have problems.
We used to have this on a 78rpm record when I was a kid. I have always loved this song.