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Author Topic: Shale or Basalt and is gold found near this  (Read 940 times)

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Offline gold man

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Shale or Basalt and is gold found near this
« on: August 16, 2016, 11:40:49 AM »
any opinions as to whether tis is shale or basalt. it crumbles and would gold be in the vacinity

Offline kcm

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Re: Shale or Basalt and is gold found near this
« Reply #1 on: August 16, 2016, 08:06:57 PM »
Of the 2 choices, I'd have to say shale. Shale is a sedimentary rock, whereas basalt is igneous.

kcm
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Online brotherjames

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Re: Shale or Basalt and is gold found near this
« Reply #2 on: August 17, 2016, 09:48:54 AM »
Good question I've wanted to ask for a while.
I've found this location on a creek that is not know for gold. I have panned every bend of this creek from sea 10 km up stream to sizable lake.  At one bend the bed rock changes from diorite to fractured sandstone for a 10 m stretch.  Between the fractures I have found flour gold and flakes  - but no where else. not even in the creek bed when side channels dry up in late August.  Is it possible that gold got trapped in the sand stone eons ago?
Cheers - BJ.
Doing my part to rid the rivers of BC of their black sand.

Offline NS Gold Seeker

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Re: Shale or Basalt and is gold found near this
« Reply #3 on: August 17, 2016, 11:47:46 AM »
I agree, looks sedimentary, if the choice is between shale and basalt, I pick shale.

It is possible that the sandstone is derived from eroded gold bearing rock and contains some gold.
The other line of thinking is that the diorite made the gold flow into the sandstone. If it is fractured the gold may have been part of a hydrothermal system.  Stick to that area and look at the contacts where the diorite meets the sandstone.  Is there any baking along that edge, contact metamorphism, then you may be able to put together a geologic history, sandstone laid down, uplift, erosion, faulting, then intrusion by diorite causing mobility of gold particles. 
Gold is good.

Online brotherjames

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Re: Shale or Basalt and is gold found near this
« Reply #4 on: August 17, 2016, 02:57:59 PM »
Thank you Gold Seeker,
Yes now that you mention it I have found pyrite at the lower contact edge. and there is some folding in the sandstone.
 <-good_>
Cheers - BJ.
Doing my part to rid the rivers of BC of their black sand.