Sound like it's worth a look:
Gilmandyke. - One of the creeks on the Campbell River just alluded to. The land on this creek differs from that of most other gold localities, though the usual metamorphic and sedimentary rocks abound in the vicinity. Rich alluvial flats bound the creek on both sides, the ridges only rising to a slight elevation. Gold was found here in plenty on the surface, but on account of the liability of the spot to floods, and its generally marshy character, the miners abandoned it without searching for dry diggings on the banks and high land. The diggers here appear to have been a rude and enterprising set of men; it having since become apparent that a renewed effort, with means to keep down the water, would be well rewarded. Gilmandyke is twenty-five miles from Bathurst, and close to the Summerhill copper mine. The country abounds with minerals.