The Heritage Act 1995 protects all historical archaeological sites in the state, and all known sites are included in the Heritage Inventory, found on the Heritage Database.
Black Cameron's mine is protected and cannot be detected and items cannot be removed from it...
I reported these as fake on eBay, however it's unlikely anything will happen to the listings.
Unfortunately eBay is riddled with fake and rip off detector sales.
I've found several listings for fake detectors tonight in a few searches. One listing for fake Fisher Gold Bugs has had 24 sales...
A mullock heap can be anything from a small pile of dirt next to an old diggings hole to something huge like you'll find near the old North British mine on Parkins Reef Road.
With the SDC you should look around areas that were shallow diggings. Also look around the mullock heaps on deep leads...
The Gold Bug Pro is a good machine and is easy to use.
Be very careful sourcing one on eBay - there are several sellers of fake machines and you'll blow your dough.
Also consider the Gold Bug DP. If your budget extends to a Gold Bug 2 then you cannot go wrong - again though be careful where...
Very close to town some areas are restricted from prospecting. See the map below.
https://parkweb.vic.gov.au/__data/assets/pdf_file/0003/636663/Maldon-prospecting-map.pdf
Aside from the areas where you can't prospect, there are plenty of places you can that are within a stones throw of town...