I found good topaz by sieving in the creek that drains into Tanner Bay (I think it’s called Mines Creek). The locals will have better instructions, but I seem to recall the entrance to the old mining area being a couple of power poles past the Tanner Bay turn-off. Once there, I found a bit of topaz by just sieving the banks of a couple of the ponds left after mining, but did much better by walking over to the nearby creek, and walking downstream about 10 minutes. I got quite a lot of crystal-clear but not very big, angular topaz from shallow wash directly on bedrock.
Killiecrankie Bay is not far off, and it should have much bigger topaz, but I’ve never dug there. I think these days you have to wait for a very low tide and get wet, a bit like at Doctors Rocks.
As far as I recall there was no spinel like in the NE, just quartz and topaz. The topaz really stands out as it glows compared to the quartz.