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Opal mining 'ballrooms' carved out beneath Lightning Ridge threaten to collapse roads in state's gemstone capital
Bill Kotru has seen many mines give way during the 43 years he has been digging for opal in Lightning Ridge, but he now fears ... two roads in the north-western NSW town after dips began appearing ...
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Why black opal is one of the most expensive gemstones in the world
Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones ... opal is found here, at Lightning Ridge. It's located on the edge ...