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Gold Prospecting
Hard Rock Gold Prospecting
Hard rock gold from around the world...
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<blockquote data-quote="user 4386" data-source="post: 653090" data-attributes="member: 4386"><p>Perhaps it is worth mentioning that 75% being native gold at Kalgoorlie is because 20% does not occur as gold at all but as gold telluride minerals that don't even resemble gold. Such as calaverite (AuTe2) which contains around 40% gold. The other 5% is very fine gold locked in sulphide minerals. So the term "native gold" in this case is referring to visible native gold.</p><p></p><p>Calaverite - 40% gold!</p><p></p><p>[ATTACH=full]4568[/ATTACH]</p><p>In many Nevada deposits like the shale that I showed photos of, gold is rarely seen - it is so fine that it is truly invisible, too small to be resolved by the naked eye. In fact too fine to be seen under a normal microscope. The gold is actually present as individual gold atoms or ions that substitute into the crystal structure of sulphide minerals, mostly pyrite, and can only be resolved under an electron microscope. You could crush the rock and pan it and still not see a spec of gold, even if it were going half an ounce or more per tonne. It occurs in different concentrations in growth zones in individual pyrite crystals.</p><p></p><p>[ATTACH=full]4567[/ATTACH]</p></blockquote><p></p>
[QUOTE="user 4386, post: 653090, member: 4386"] Perhaps it is worth mentioning that 75% being native gold at Kalgoorlie is because 20% does not occur as gold at all but as gold telluride minerals that don't even resemble gold. Such as calaverite (AuTe2) which contains around 40% gold. The other 5% is very fine gold locked in sulphide minerals. So the term "native gold" in this case is referring to visible native gold. Calaverite - 40% gold! [ATTACH type="full"]4568[/ATTACH] In many Nevada deposits like the shale that I showed photos of, gold is rarely seen - it is so fine that it is truly invisible, too small to be resolved by the naked eye. In fact too fine to be seen under a normal microscope. The gold is actually present as individual gold atoms or ions that substitute into the crystal structure of sulphide minerals, mostly pyrite, and can only be resolved under an electron microscope. You could crush the rock and pan it and still not see a spec of gold, even if it were going half an ounce or more per tonne. It occurs in different concentrations in growth zones in individual pyrite crystals. [ATTACH type="full" width="487px"]4567[/ATTACH] [/QUOTE]
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Gold Prospecting
Hard Rock Gold Prospecting
Hard rock gold from around the world...
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