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Author Topic: Is Grabben Gullen dead?  (Read 522 times)

Sandbagger

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Is Grabben Gullen dead?
« on: January 16, 2019, 09:39:50 PM »
I read all about Grabben Gullen on this forum and others over a year ago now. Early last year I gave it a go, just upstream and around the bridge.

Nil, Zero, zilch, nada, nuffin.

Not even a spinel.

What's the go? All the other threads on GG seem quite old. Is there any up-to-date information on it?

Baz.

Jimnyjerry

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Re: Is Grabben Gullen dead?
« Reply #1 on: January 17, 2019, 09:54:09 AM »
Area has been dug very heavily over the last few years. Including with highbankers and walliebankers when they were still legal. So not much to find until the area gets a huge flood. Last good flood years ago through the area reached 10 metres further down stream.
I try to take one day at a time, but sometimes several days attack me at once.

Sandbagger

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Re: Is Grabben Gullen dead?
« Reply #2 on: January 19, 2019, 07:03:27 PM »
Thanks mate.

I have a question about the source of the sapphire.

If the specimens found are tiny, broken up and off larger crystals, one would assume there is a source further upstream, (Logically). Would this source be a single lode of larger stuff at a given area, or is it in the ground, broken up all the way along the rivers?

Does the erosion bring the stuff down from higher elevations, flats and surrounding catchments, or does it just wash the top off what is already there, all along the river?

Some specimens I have found in other places have a hexagonal cross section, like they are a slice from a large crystal. Where are these crystals?

I hear, "No-one really knows" all the time and think, I'm being fed a line - surely someone knows? How long have humans been mining this stuff?

Then I think, if someone does know, then surely it would all be gone?

Baz.


Jimnyjerry

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Re: Is Grabben Gullen dead?
« Reply #3 on: January 20, 2019, 10:23:54 AM »
Original deposits in most cases have been weathered away and sapphire alluvials formed in ancient rivers.  These have since been covered in sediment in seas and other lava flows. Land has risen up and new river systems have cut through the ancient alluvial deposits. Some times removing them altogether. At other times still buried under parts of old basalt flows that now are on hill sides or tops.

For eg read through http://www.geomaps.com.au/scripts/tumbarumbagem.php
I try to take one day at a time, but sometimes several days attack me at once.

Sandbagger

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Re: Is Grabben Gullen dead?
« Reply #4 on: January 20, 2019, 11:12:14 PM »
Original deposits in most cases have been weathered away and sapphire alluvials formed in ancient rivers.  These have since been covered in sediment in seas and other lava flows. Land has risen up and new river systems have cut through the ancient alluvial deposits. Some times removing them altogether. At other times still buried under parts of old basalt flows that now are on hill sides or tops.

For eg read through http://www.geomaps.com.au/scripts/tumbarumbagem.php

Thanks mate, that's a great read! I will make plans to visit the creeks there.

Baz.

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