Opal mining is done by 2-3 person operations rather than big companies because opals don't run in seams like gold, they are quite random so you just have to strike it lucky. The miners peg their claim and start digging through the sandstone, albeit using more sophisticated equipment today. Beware wandering about there is deep uncovered hole beside nearly every one of those dirt piles.
We were having a coffee at the bakery and I noticed a sign on a hotel saying it was a Cobb and Co coach stop. That got me wondering if there was a hidden Royal Hotel in the town. A quick google revealed not that hotel but this derelict one as the former Royal.