I can't give you lyrics, but here are a few leads:

I read that in 1956 John Latouche wrote the liberetto for an opera - " The Ballad of Baby Doe" It has been performed many times at the Central City Opera House.

This may not be what you are looking for, though. If you really want to find it, I would check with the Denver Public Library or the Colorado Historical Society.

To me, it really sounds a lot like Johnny Horton - he did a lot of historical ballads in the late 50s - but I don't know where to find listings of his song titiles.