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Gold Prospecting
Metal Detecting for Gold
How to read or interpret Geo maps
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<blockquote data-quote="user 4386" data-source="post: 643221" data-attributes="member: 4386"><p>That is the point I am making - the problem being that it varies with where you are, although mostly in a broad sense. For example in the Archean rocks of Western Australia you would be looking at either primary gold in greenstone or alluvial gold in Cenozoic and younger gravels etc. Around Pine Creek in Neoproterozoic to Palaeozoic sedimentary rocks (from memory) and Cenozoic gravels. Around Tennant Creek in Palaeoproterozoic sedimentary rocks especially near ironstone. At White Range in Devonian and younger rocks of variopus types, not older. Best thing is ask about a specific area where you are focussed (not necessarily on-line here).</p><p></p><p>Gold is introduced into rocks in various specific events, often of fairly limited length (what is a 100 million years between frikends?) You won't find primary gold in the Cenozoic anywhere in Australia except in alluvial gravels or old laterites (the latter being supergene and related to weathering, but not alluvial). But there are few other generalizations - you can see it being deposited from hot springs in the North Island of NZ. So you need local geological knowledge. You obviously have some general idea.</p></blockquote><p></p>
[QUOTE="user 4386, post: 643221, member: 4386"] That is the point I am making - the problem being that it varies with where you are, although mostly in a broad sense. For example in the Archean rocks of Western Australia you would be looking at either primary gold in greenstone or alluvial gold in Cenozoic and younger gravels etc. Around Pine Creek in Neoproterozoic to Palaeozoic sedimentary rocks (from memory) and Cenozoic gravels. Around Tennant Creek in Palaeoproterozoic sedimentary rocks especially near ironstone. At White Range in Devonian and younger rocks of variopus types, not older. Best thing is ask about a specific area where you are focussed (not necessarily on-line here). Gold is introduced into rocks in various specific events, often of fairly limited length (what is a 100 million years between frikends?) You won't find primary gold in the Cenozoic anywhere in Australia except in alluvial gravels or old laterites (the latter being supergene and related to weathering, but not alluvial). But there are few other generalizations - you can see it being deposited from hot springs in the North Island of NZ. So you need local geological knowledge. You obviously have some general idea. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
How to read or interpret Geo maps
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