>>1551745Tasmaniafag here. Some good gold panning to be had on the west coast of the island, but often requires a boat to access.
In the north east of the island there's a pretty sweet gem field where you can fossick in rivers. The gravels contain opaque black spinels, clear topaz and blue to green sapphires. In a good spot you can pick up to ten sapphires out of each sieve.
Pic related presents some sapphires and a big topaz I got cut.