collapse

Author Topic: Is Grabben Gullen dead?  (Read 249 times)

Sandbagger

  • ALF'er Bronze Member
  • *
  • Posts: 10
    • View Profile
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

  • Global Moderator
  • ALF'er VIP
  • *****
  • Posts: 2493
  • balts pingvins
    • View Profile
    • Email
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

  • ALF'er Bronze Member
  • *
  • Posts: 10
    • View Profile
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

  • Global Moderator
  • ALF'er VIP
  • *****
  • Posts: 2493
  • balts pingvins
    • View Profile
    • Email
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

  • ALF'er Bronze Member
  • *
  • Posts: 10
    • View Profile
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.

Tags:
 

* Sponsor

HTML Online Editor Sample

ALF is hosted by Aussie Sapphire as a free service to the Lapidary community.

Visit our website here
Phone 1800 50 21 40
Or find us on Facebook

Recent Activities

Fossicking locations around Perth (less than 400km) by paullym
[Today at 02:11:40 PM]


choosing the right electromotor, please help. by MakkyBrown
[February 20, 2019, 10:04:02 PM]


Swipers gully by slippery eel
[February 20, 2019, 05:34:31 PM]


Opal suppliers? by harryopal
[February 20, 2019, 02:44:47 PM]


Dangerous minerals by starsapphire78
[February 20, 2019, 01:24:26 PM]


Lambert Industries Thailand by MrSydney
[February 20, 2019, 12:00:20 PM]


GEMORAMA by Lord_Thunda
[February 19, 2019, 06:44:19 PM]


403 errors by Lord_Thunda
[February 18, 2019, 04:19:40 PM]


to dig or not to dig by MrSydney
[February 18, 2019, 10:06:17 AM]


Copeton Dam by MrSydney
[February 18, 2019, 09:55:00 AM]


Emerald Cuts, any tips? by journeyman
[February 16, 2019, 05:55:01 PM]


Diamond Pacific Genie by olaf
[February 14, 2019, 01:12:32 AM]

* Calendar

February 2019
Sun Mon Tue Wed Thu Fri Sat
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 [21] 22 23
24 25 26 27 28

No calendar events were found.
Sorry! There are no calendar events available at the moment.

* Who's Online

  • Dot Guests: 68
  • Dot Hidden: 0
  • Dot Users: 0

There aren't any users online.

* Find us on Facebook

* Forum Stats

  • stats Total Members: 3891
  • stats Total Posts: 54238
  • stats Total Topics: 5772
  • stats Total Categories: 6
  • stats Total Boards: 27
  • stats Most Online: 160