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Gold Prospecting
Alluvial Gold Prospecting
Confused about sudden change in deposition layers in creek
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<blockquote data-quote="Sushi" data-source="post: 481169" data-attributes="member: 12342"><p>In terms of depositing of material, this is generally the case, however if there's large scale mining going on in the area obviously this is going to change. I'm not knowledgeable on the area.</p><p></p><p>Rocks and minerals that have stayed within a river system for a long period of time get worn into rough circular shapes, its the same principle as tumbling rocks. Because one of those quartz crystals still has a nice termination (where the 6 crystal faces meet into a point), you can assume it hasn't traveled very far from the source or hasn't been moved rigorously enough to round the mineral.</p><p></p><p>You would need to research the area more on sapphires, which in Australia, are usually deposited in rivers. I think the website Mindat and the DIGS geological surveys would be good places to start. They usually have drillings from areas stating what they've found. If you could find the alluvial gravel sitting above or inside pockets of bedrock, you'd have a really good chance of sapphires, zircons, spinel and gold.</p></blockquote><p></p>
[QUOTE="Sushi, post: 481169, member: 12342"] In terms of depositing of material, this is generally the case, however if there's large scale mining going on in the area obviously this is going to change. I'm not knowledgeable on the area. Rocks and minerals that have stayed within a river system for a long period of time get worn into rough circular shapes, its the same principle as tumbling rocks. Because one of those quartz crystals still has a nice termination (where the 6 crystal faces meet into a point), you can assume it hasn't traveled very far from the source or hasn't been moved rigorously enough to round the mineral. You would need to research the area more on sapphires, which in Australia, are usually deposited in rivers. I think the website Mindat and the DIGS geological surveys would be good places to start. They usually have drillings from areas stating what they've found. If you could find the alluvial gravel sitting above or inside pockets of bedrock, you'd have a really good chance of sapphires, zircons, spinel and gold. [/QUOTE]
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Gold Prospecting
Alluvial Gold Prospecting
Confused about sudden change in deposition layers in creek
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