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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: 663598" data-attributes="member: 4386"><p>So that is how everything is made to be within a km - exclude things further than 1 km? <img class="smilie smilie--emoji" loading="lazy" alt="🤣" title="Rolling on the floor laughing :rofl:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f923.png" data-shortname=":rofl:" /></p><p></p><p>Seriously though, it is all one big gold belt extending NW for 200 km - to pick one tiny part of it seems to ignore the pattern (that gold is not closely related to granites in the belt, or more accurately, that the granites were already there for 65-75 million years before the gold deposits formed). Often, as probably in this case, if a lot of the rocks in a region are granites, a number of gold deposits will occur near granites. Opal jewellery stores and donut shops cluster around Melbourne town hall, but postdate the town hall by many decades - they just occur in the central Melbourne CBD (as with gold deposits occurring in the Pine Creek gold belt).</p><p> </p><p>"geological evidence, used in conjunction with U-Pb age data obtained from SHRIMP in- situ analyses of hydrothermal gold-stage phosphates, demonstrates that the gold mineralisation is typically younger (c.1720-1710Ma) than the youngest phase of granitoid intrusion (c.1775Ma), and certainly post-dates the effects of peak contact-metamorphism". </p><p></p><p></p><p>[ATTACH=full]7987[/ATTACH]</p></blockquote><p></p>
[QUOTE="user 4386, post: 663598, member: 4386"] So that is how everything is made to be within a km - exclude things further than 1 km? 🤣 Seriously though, it is all one big gold belt extending NW for 200 km - to pick one tiny part of it seems to ignore the pattern (that gold is not closely related to granites in the belt, or more accurately, that the granites were already there for 65-75 million years before the gold deposits formed). Often, as probably in this case, if a lot of the rocks in a region are granites, a number of gold deposits will occur near granites. Opal jewellery stores and donut shops cluster around Melbourne town hall, but postdate the town hall by many decades - they just occur in the central Melbourne CBD (as with gold deposits occurring in the Pine Creek gold belt). "geological evidence, used in conjunction with U-Pb age data obtained from SHRIMP in- situ analyses of hydrothermal gold-stage phosphates, demonstrates that the gold mineralisation is typically younger (c.1720-1710Ma) than the youngest phase of granitoid intrusion (c.1775Ma), and certainly post-dates the effects of peak contact-metamorphism". [ATTACH type="full" alt="1676539436811.png"]7987[/ATTACH] [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Detecting bigger gold in NSW...."Alluvial" vs "Eluvial"
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