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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.
The primary sources of opal are Australia and Ethiopia, but because of inconsistent and widely varying accountings of their respective levels of extraction, it is difficult to accurately state what proportion of the global supply of opal comes from either country. Australian opal has been cited as accounting for 95–97% of the world's supply ...
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.
The Olympic Australis opal is the largest and most valuable opal yet found (as of 1961) [1] and was valued at A$2,500,000 in 1997. [2] It was found in 1956 at the 'Eight Mile' opal field near the town of Coober Pedy in South Australia. [3] The opal was found at a depth of 9.1 metres (30 ft).
Boulder opal, oil and gas mining are major secondary industries for the local economy. The majority of the employees of these industries are local residents, with low rates of both unemployment and itinerant work. Quilpie has one opal mining field; Toompine Field is located between Quilpie and Yowah.
The value of these mines was soon ... which has replaced a number of underground mines at Boulder, Western Australia. ... Opal – Australia is the world's largest ...
The mines of the West Coast of Tasmania have a rich historical heritage as well as an important mineralogical value in containing or having had found, specimens of rare and unusual minerals. Also, the various mining fields have important roles in the understanding of the mineralization of the Mount Read Volcanics , and the occurrence of ...
As an opal dealer I deal with both Australian and Ethiopian Opals. It is my understanding that Australian Opal is sedimentary and Ethiopian Opal is volcanic. A discussion of the formation of different types of opals should be included. — Preceding unsigned comment added by Rinda Edgmarbou (talk • contribs) 02:00, 25 October 2019 (UTC)
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