There are a few mining songs collected in Glace Bay. I don't know if they are too modern. They were recorded by George Korson in 1940. However, while they were sung in Cape Breton, they don't specifically mention Cape Breton.

Jolly Wee Miner Men (Canadian version of a well known song in England, Scotland, and the U.S.)
Arise, Ye Nova Scotia Slaves (specifically mentions Glace Bay, but was probably written around 1910)
Wild Rover (a different version of the very well known song)
In New Glasgow I Was Born (not from Cape Breton, but fairly close)
The Bumps (this might possibly be from Springhill, but sung in Cape Breton)
The Yahie Miners (also mentioned above, this is said to be 60 years old in 1943)