I see from the marriage register that James Gibb lived in Poozoondoung which was the location of a number of rice mills.
There's a mention of a mill being built by James Gibb, a Scot, in 1882 https://goo.gl/Q2mGpL
Also on the marriage register I noticed that James & Jane Gibb were witnesses to the marriage of John Patterson (28, engineer of Poozoondoung) and Ellen Cooley (23. late of Battersea) in December 1880.
Is there a link for the wedding witness thing - that sounds a promising lead and is new information.
Best regards
Andy