Koroit opal field, Boulder opal mining area in Queensland, Australia
The Koroit opal field extends across sedimentary rocks of the Winton Formation, producing opals embedded within ironstone concretions of varying sizes.
Lawrence Rostron discovered the opal field in 1897, but substantial mining operations only resumed in 1972 when the stones gained commercial recognition.
The mining site attracts professional miners and recreational fossickers who seek valuable gemstones through open-cut mining and underground shaft methods.
Visitors to the mining area need to prepare for remote conditions without electricity or running water, located 80 kilometers northwest of Cunnamulla.
The field produces distinct 'Koroit Nuts', which are ironstone boulders containing solid opal veins within their core structure.
Location: Queensland
GPS coordinates: -27.58940,145.35900
Latest update: March 10, 2025 04:57
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