YouTube - The Big Rock Candy Mountains Lyrics 
The song apparently dates to around the 1920s, this song was written by Harry McClintock.
The song was first recorded in 1928 by Harry McClintock, also known as Haywire Mac. The Haywire Mac version peaked at #1 in 1939 country music charts printed by Billboard magazine. It is probably best remembered for its recording by Burl Ives in 1949, but it has been recorded by many artists throughout the world.