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The Koroit opal field is known for the very distinctive type of boulder opal that is found in its mines. In Queensland boulder opal is found within a 300 km wide belt of sedimentary rocks in the Winton Formation. Here opal is found as a kernel in small concretions. [1] The Koroit Opal field was discovered in 1897 by Lawrence Rostron.
Opalton is a outback rural locality in the Shire of Winton, Queensland, Australia. [2] It is known for the Opalton Opal Field, one of the largest and most extensively worked opal deposits in Queensland. [3] In the 2021 census, Opalton had a population of 59 people. [1]
Yowah is an outback town and locality in the Shire of Paroo, Queensland, Australia. [2] [3] In the 2021 census, the locality of Yowah had a population of 126 people.[1]The town is known for its opal mining and numerous opal fields that lie around the town as well as the "Yowah nut", a local type of opal distinctive to the region.
The Yowah opal field in the Shire of Paroo. The Yowah nut is a type of precious opal, found within the Yowah opal fields situated in Yowah, Shire of Paroo, South West Queensland, Australia since the latter part of the 19th century. [1] These opals are known for their distinctive nut-like shape, opalescent patterns, and vibrant colours.
Adavale was the location of Australia's first opal discovery. [9] The town of Yowah is built on an opal field which began producing opals in the 1870s. [24] Opals are also found at Koroit opal field, Quilpie, Eulo and in northern New South Wales. The geological formation containing opals in South West Queensland is called the Winton Formation. [25]
Lightning Ridge is a small outback town in north-western New South Wales, Australia.Part of Walgett Shire, Lightning Ridge is situated near the southern border of Queensland, about 6 km (4 mi) east of the Castlereagh Highway.
Yaraka Opal Field encompasses the mines within and west of the Macedon Range including Harlequin and Mount Tighe. It is known for top patterns and various types of opal in as many as eight levels. Mines include Spur, Polykettle, Cockatoo and Pretty Gully. [38] There are two national parks near Yaraka.
Other minerals mined in the state include copper, lead, silver, zinc, gold, phosphate rock, magnesite and silica sand. Gemstones such as sapphire, opal and chrysoprase are also mined in commercial quantities. Opal fields extend from the Koroit opal field in South West Queensland into New South Wales.