Don't think Oallen Ford is too far & plenty of members frequently go there.
Might be worth doing some research on Nerriga & Yalwal as well.
Have read that there were nuggets up to 240 ounces found around Nerriga but I think the whole area is probably better known for fine gold.
Edit: also at kangaroo valley reports of jasper, petrified wood, agate etc. with one access point that may be a possibility near Hampden Bridge on the Kangaroo River.