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Gemstones, Minerals & Fossils
Fluorescent Minerals
Opal mining: If It Glows Do I Want It
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<blockquote data-quote="user 4386" data-source="post: 661114" data-attributes="member: 4386"><p>About 60% will fluoresce, but perhaps only a third of black opal.</p><p></p><p>I have rarely seen timber supports underground in operating opal mines. Cannot compare with things like South African gold mines! However even opal mines do become unstable with time and I do not recommend entering old workings without an experienced miner with you to bar loose stuff down.</p></blockquote><p></p>
[QUOTE="user 4386, post: 661114, member: 4386"] About 60% will fluoresce, but perhaps only a third of black opal. I have rarely seen timber supports underground in operating opal mines. Cannot compare with things like South African gold mines! However even opal mines do become unstable with time and I do not recommend entering old workings without an experienced miner with you to bar loose stuff down. [/QUOTE]
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Gemstones, Minerals & Fossils
Fluorescent Minerals
Opal mining: If It Glows Do I Want It
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