Up at the library in Ballarat in the Australiana special reference section, there is a typed document that is a brief history of Gordon and it is the only one that I have seen.
The Ballan Shire Historical Society published "A Pictorial History of the Shire of Ballan" in 1989, and I was given a copy in 1996. Whether it is still available I am unsure. ISBN 0 7316 5415 3. Being a pictorial history, most of the references are more recent.
The book doesn't quote the origins of the name of Gordon, though it shows the licenced runs as of 1838, and the run of Boorambeta had the licencee George Gordon. It was to the west of the Ballan run, with its eastern boundary looking to be parts of the East Moorabool River.
There are some excerpts from "Ballarat Star" about gold discoveries in the area, dated 29th May and 21st Jun 1858.