Hi Phil
from your description it is Coles Bridge. Coming from Sofala, cross the bridge and head up the hill. When you come to the left hand bend, take the track that leads off to the right. Follow this down to the river and along till it crosses the river. If you have a suitable vehicle and the river is low enough, cross the river and drive about 250m and you will see a large rocky bar. Digging down amoung the rocks here will produce colour in your pan. It may take a couple of spots to produce colour but it will.
Dont be afraid to dig away from the current water coarse looking for gold as when it floods this whole area gets replenished.
You need to get your dirt for paning from dirt that is sitting on a solid base not just from the dirt and sand sittng on the top. Gold will sink until it hits a solid layer be it rock or even clay.
Hope this helps
cheers
Bob