If you go to Hicks Ck, far west NT, there is an amethyst vein in the bed of the creek. I took out about 150 kg over 3 seasons. Upstream from the concrete crossing is a basalt bar, some 120m upstream It is all hard rock digging. The vein was about 3.5 m long.
Co-ords -16.1981986, 129.0557226
Good campsite immediately before the grid, and left 250 m
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Plenty of locations for garnet fossicking in the Harts Ranges, central NT.
Cheers, Bobj.