But over 90% of the world's opal comes from Australia. And a lot of the black opal is found here, at Lightning Ridge. It's located on the edge of the Outback, with a population of just over 2,000 ...
Over 90% of black opals come from Australia, but they aren't easy to find. Miners start by drilling a vertical shaft in an area they think contains opal. Then they must clear out an underground ...
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