Here is the site that connected the song to Alberta, Canada.

http://www.whitepinepictures.com/seeds/i/13/sidebar.html
A Land As Green As The Sea - Celtic Music

quote
"...To this day, Radford keeps running into versions of Celtic music in
             the strangest places. In the ranching community of southern Alberta, for example, Radford was
             introduced to the Celtic roots of cowboy music. Several years ago, a friend of his gave him a
             copy o f a song called "Farewell to Coigach," which is believed to be the only surviving cowboy
             song written in North America in Gaelic. "


Alice