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Gold Prospecting
Metal Detecting for Gold
Detecting bigger gold in NSW...."Alluvial" vs "Eluvial"
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<blockquote data-quote="user 4386" data-source="post: 663611" data-attributes="member: 4386"><p>Yes - once you recognize the patterns it makes the search easier.</p><p></p><p>It is similar in the NT region (Pine Creek belt) once you add the minor occurrences not shown on my NT map above. The map only shows a small percentage of the gold occurrences (the big ones mined in the past). Many early woekers thought the Victorian gold was related to granite contacts but once you see the extent of linear zones it becomes obvious that in the main the pattern is unrelated to individual granites.</p><p></p><p>I would emphasize that that does not mean that gold is not related to granite elsewhere (eg North Queensland,, or central west NSW where both types occur). For example, Cadia and Browns Creek are granite-related, Hill End and Gundagai probably not. Young is in a fault-zone that cuts through granite (so it is spatially related to a granite older than it, but unrelated genetically to the granite - the granite was probably simply already there when the gold came in.</p><p></p><p>Here is a map around Cadia, Cowal etc - "Ordovician Magmatic Centre" means granite. Note how closely the gold is related spatially to the granites (mostly within them or within a few hundred metres of them).</p><p></p><p>[ATTACH=full]7990[/ATTACH]</p><p>Note that they are mostly on the contacts of the granite areas and just within the granites (give or take a couple of hundred metres at most). This is the big clue - they can still appear to form short, linear trends where the granites are elongated north-south (as some of these are).</p><p>I am over-simplifying slightly - "Ordovician volcanic centre" also includes lavas, but mostly with a composition similar to granite (essentially granite that has flowed out at surface).</p></blockquote><p></p>
[QUOTE="user 4386, post: 663611, member: 4386"] Yes - once you recognize the patterns it makes the search easier. It is similar in the NT region (Pine Creek belt) once you add the minor occurrences not shown on my NT map above. The map only shows a small percentage of the gold occurrences (the big ones mined in the past). Many early woekers thought the Victorian gold was related to granite contacts but once you see the extent of linear zones it becomes obvious that in the main the pattern is unrelated to individual granites. I would emphasize that that does not mean that gold is not related to granite elsewhere (eg North Queensland,, or central west NSW where both types occur). For example, Cadia and Browns Creek are granite-related, Hill End and Gundagai probably not. Young is in a fault-zone that cuts through granite (so it is spatially related to a granite older than it, but unrelated genetically to the granite - the granite was probably simply already there when the gold came in. Here is a map around Cadia, Cowal etc - "Ordovician Magmatic Centre" means granite. Note how closely the gold is related spatially to the granites (mostly within them or within a few hundred metres of them). [ATTACH type="full" alt="1676586533829.png"]7990[/ATTACH] Note that they are mostly on the contacts of the granite areas and just within the granites (give or take a couple of hundred metres at most). This is the big clue - they can still appear to form short, linear trends where the granites are elongated north-south (as some of these are). I am over-simplifying slightly - "Ordovician volcanic centre" also includes lavas, but mostly with a composition similar to granite (essentially granite that has flowed out at surface). [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Detecting bigger gold in NSW...."Alluvial" vs "Eluvial"
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