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KenKlondike

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Author Topic: A Great Vid - The Geology Of- MOTHER LODE VEINS- the secret of earth gold  (Read 1045 times)

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Offline mentalcoincoin

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Offline u3o8

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Re: A Great Vid - The Geology Of- MOTHER LODE VEINS- the secret of earth gold
« Reply #1 on: December 20, 2016, 03:15:00 PM »
That was a great vid.
Thanks for sharing

Online KenKlondike

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Re: A Great Vid - The Geology Of- MOTHER LODE VEINS- the secret of earth gold
« Reply #2 on: December 20, 2016, 03:57:10 PM »
sorry but I don't believe that theory.

kk

Offline mentalcoincoin

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Re: A Great Vid - The Geology Of- MOTHER LODE VEINS- the secret of earth gold
« Reply #3 on: December 21, 2016, 12:51:42 PM »
http://www.nr.gov.nl.ca/nr/mines/prospector/matty_mitchell/Virtual/Carlin-Type_Low-Sulphidation-Epithermal-Gold-Deposits.pdf 
Of course  KenKlondike,you are entitled to your own opinion. :)
My own is one that this gold deposit has been studied for a very long time,by some very bright Geo's. They all see to point out,that the moral of this $pecial find is : Always sample country rock)Microscopic gold is just that,not visible to the human eye. I have a property with some various skarns within  and along side a long Quatsino limestone belt. Some of the skarns show small but decent gold counts,especially the pyrrhotite skarn. And again,gold not being visible only showed by assay.

Offline hawkeye

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Re: A Great Vid - The Geology Of- MOTHER LODE VEINS- the secret of earth gold
« Reply #4 on: December 25, 2016, 10:44:18 AM »
Enlighten us Ken, what is your theory?

Offline NickD

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I think the video is more or less correct but didn't do the best job at explaining the similarities and differences between these deposits.

Similarities:
Magma and hydrothermal fluids (water at high pressure and temperature, with other stuff mixed in) play a role.
The hydrothermal fluids transport the gold, going up through fractures/cracks/faults. It's often unclear of the source of the gold, but either the gold starts out in the magma itself, with the magma also bringing up the fluids, and at some point the fluids and gold separate out from the magma and rise up from the magma chamber... Or the magma is just a heat source, that forces the water out of nearby rocks, perhaps up to a couple miles away (dehydration reactions), and as the water comes out of the rocks and moves towards the fractures, it picks up gold.

Differences:
What's different are the details of what happens to the gold carrying fluids as they move up through the rock. That depends on depth, temperature, pressure, and what kind of rocks it's passing through, including the shape and orientation of fractures and rock layers. Depending on those details, the gold might "drop out" of the fluids at the surface like at hot-springs, or at shallow depth or even at rather high depth. The gold at Timmins, Yellowknife, Red Lake, Kirkland Lake and Val D'or mostly came out of the fluids at 4-12km depths, too deep to bother mining, but thankfully erosion (ex from glaciers) has removed a lot of the rocks that was covering them so now they're within 2km of the surface. These details are quite important for prospectors and miners because it affects what kind of rock you're looking for gold in, and whether the gold will be visible or not, high grade or low grade bulk tonnage, etc.