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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.
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.
Zinc – Australia was third to China and Peru in zinc production in 2019, producing 1.3 million tonnes, 10% of world production. [42] Coal – Australia is the world's largest exporter of coal and fourth largest producer of coal behind China, USA and India. [43] Oil shale – Australia has the sixth largest defined oil shale resources. [44]
Andamooka in South Australia is also a major producer of matrix opal, crystal opal, and black opal. Another Australian town, Lightning Ridge in New South Wales , is the main source of black opal, opal containing a predominantly dark background (dark gray to blue-black displaying the play of color), collected from the Griman Creek Formation . [ 31 ]
A strong and obvious links between Koroit and Ireland is the potato crops grown in the rich volcanic soil surrounding the town. The township of Koroit was surveyed and the first town allotments were sold in 1857. A post office opened on 23 April 1858. [4] Eight sites in Koroit are listed in the Register of the National Estate. [citation needed]
On 12 August 2006 Open-pool Australian lightwater reactor (OPAL), the 20 MW replacement reactor located on an adjacent site, went critical. [6] OPAL is served by the same complex of research, isotope production and remote handling laboratories. The two reactors ran in parallel for six months while OPAL was being tested.