ocr: LIGHTNING RIDGE PAL at Lightning Ridge, New Surface opal is mined from open South Wales, Australia, occurs pits. Better-quality opal is usually either in veins in sedimentary rock, or found below the surface, and is as lumps called "nobbies" (fossils that mined underground. have gradually been replaced by opal). OPAL MINE Mining con ditions sare hot and dry in Australia. a
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