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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="user 4386" data-source="post: 481110" data-attributes="member: 4386"><p>While that is one possibility I suspect another. These are not pristine drainages, they have been worked already multiple times in the past, and each time a large amount of clay is stirred up and travelled downstream. Mines discharged their tailings into the streams. So you could be looking at deposits 150 years old or less. For the coarse stuff, go to bedrock. The modern deposits are so deep in some areas (e.g. Bendigo) that we map them as a separate geological unit. You can have tens of millions of cubic metres of sludge wash down a single stream.</p></blockquote><p></p>
[QUOTE="user 4386, post: 481110, member: 4386"] While that is one possibility I suspect another. These are not pristine drainages, they have been worked already multiple times in the past, and each time a large amount of clay is stirred up and travelled downstream. Mines discharged their tailings into the streams. So you could be looking at deposits 150 years old or less. For the coarse stuff, go to bedrock. The modern deposits are so deep in some areas (e.g. Bendigo) that we map them as a separate geological unit. You can have tens of millions of cubic metres of sludge wash down a single stream. [/QUOTE]
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Gold Prospecting
Alluvial Gold Prospecting
Confused about sudden change in deposition layers in creek
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