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Gold Prospecting
Metal Detecting for Gold
Hunting for "REEF" Gold....an approach for beginners.
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<blockquote data-quote="user 4386" data-source="post: 653312" data-attributes="member: 4386"><p>Just to explain more clearly - the photo I showed was a working face averaging around 11 g/t gold across it (from a mine that was the source of many alluvial nuggets in the gully that drains it). However , most gold in the quartz is concentrated with sulphides in the more sulphide-rich margins with slate inclusions. The margins weather more readily and the sulphides oxidise in outcrop, so often the big bucky quartz blow is all that is obvious at surface, not the laminated material in contact with the wall-rock, which has disintegrated into the soil.</p><p></p><p>My point was - certainly don't waste time detecting within the massive white quartz (we agree on that) but try in soil along its margins - assuming that you are within an old goldfield to start with. Another detailed photo of the margin of the face (not mine) may better clarify what I mean. I'll avoid the theory but there is a good chemical reason why the gold and sulphides concentrate with the slate on the margins.</p><p></p><p>[ATTACH=full]4662[/ATTACH]</p><p></p><p>Not from Ballarat or any of the other scores of goldfields that I have worked on (finding one mine that is still working)- I gave Ballarat as an example because of its numerous large nuggets and accurate known locations for them and because it is typical of many central Victorian fields with quartz blows. I agree not warranting further discussion.</p></blockquote><p></p>
[QUOTE="user 4386, post: 653312, member: 4386"] Just to explain more clearly - the photo I showed was a working face averaging around 11 g/t gold across it (from a mine that was the source of many alluvial nuggets in the gully that drains it). However , most gold in the quartz is concentrated with sulphides in the more sulphide-rich margins with slate inclusions. The margins weather more readily and the sulphides oxidise in outcrop, so often the big bucky quartz blow is all that is obvious at surface, not the laminated material in contact with the wall-rock, which has disintegrated into the soil. My point was - certainly don't waste time detecting within the massive white quartz (we agree on that) but try in soil along its margins - assuming that you are within an old goldfield to start with. Another detailed photo of the margin of the face (not mine) may better clarify what I mean. I'll avoid the theory but there is a good chemical reason why the gold and sulphides concentrate with the slate on the margins. [ATTACH type="full" alt="1663462730328.jpeg"]4662[/ATTACH] Not from Ballarat or any of the other scores of goldfields that I have worked on (finding one mine that is still working)- I gave Ballarat as an example because of its numerous large nuggets and accurate known locations for them and because it is typical of many central Victorian fields with quartz blows. I agree not warranting further discussion. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Hunting for "REEF" Gold....an approach for beginners.
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