Across the road from GZ there is a 6' diameter by 25' long boiler, 2 of brick steeping pits, the remains of the lid crane, the chimney, 2 dams, extensive pipework and lots of building foundations. Also there is the remails of a wooden cart or dray.
The boiler is cast with the manufacturers name of Hammon & Halliday Eng, Footscray.
You are looking for a small 200 ml plastic container hidden in a fashion recognisable to geocachers. It contains a log book, pencil and the usual tradeable items, and a special treat for the First To Find!
Although there is a For Sale sign on the paddock, I don't think the owner would mind you having a close look at the items at this site. And if they do just respect their wishes. Much can be seen from the road anyway.