The greater Lightning Ridge Opal Fields encompass the older town fields, the Coocoran to the west, Mehi to the north and the Grawin, Sheepyard & Glengarry fields to the south-west near the township of Cumborah. — with Kiki Krista Takacs.
“Discovered in 1989, this is one of the largest (2765 carats) and finest quality boulder opals ever mined. This opal is unique not only for its size but also for its quality -- every color of the spectrum is visible which is extremely rare, even in the finest of opals.” “Opal, Opalville Mine, Queensland, Australia” by Wikipedia Loves Art participant “Assignment_Houston_One” is licensed under CC By-SA 2.5
Fossicking in Queensland | Recreation, sport and arts | Queensland Government
The National Opal Collection | The Australian Opal Fields
In Australia there are several active opal mining fields, and potentially many more lying undiscovered.
Australian Opal Fields
Unique to Queensland’s Tropic of Capricorn, boulder opal occurs within a belt of deeply weathered Cretaceous sedimentary rocks, known as the Winton Formation. Dig for your own opals at Opalton, 124 kilometres from Winton (unsealed road).