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How Opal is Mined?
Opal:
Opal has been a mystery for centuries. No two opals look alike. Nearly 95% of the opal is found in Australia. There are three major opal mining regions in Australia that produce different types of opal.
White opal also known as "milk" opal is found in and around the towns of Coober Pedy, Mintabie and Andamooka in South Australia. The most famous opal is the black opal which is found in Lightning Ridge in the state of New South Wales. Boulder Opal is found in Central Queensland, Quilpie, Winton and Opalton. Other opals include Light Opal, Doublet, Triplet, Common, Synthetic and Imitation.
Lightning Ridge, NSW, is famous for glorious black opal. White Cliffs is Australia's oldest commercial opal field. Opal was first mined at White Cliffs about 1889. For nearly 30 years, White Cliff opal fields produced opal for the world market.
The real development of Queensland's vast opal deposits began in 1873 with the discovery of fine quality opal north of Thargomindah. Opal mines are concentrated in certain regions like Yowah, Quilpie, Eromanga and Jundah.
Coober Pedy is famous for White or milky opals. At present, opal fields encompass an area of approximately 45 kilometres. Andamooka is one of Australia's most famous opal fields, having produced some of the most beautiful pieces of opal. The opal fields in and around Andamooka produce top gem, crystal, light opal and some dark opal.
Opal usually occurs in both sedimentary and volcanic rocks. There are various methods of opal mining.
Methods of opal mining
Sink a shaft:
A shaft is sunk straight down until some promising "opal dirt" is discovered.
Open cut mining
Noodling:
Some have taken to large scale machine noodling by allowing large amounts of opal dirt travel on a conveyer belt under ultra-violet light, which detects the precious opal.