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GeneralUnknown mine in Warner Mountains

18th Nov 2019 01:33 UTCAndrew C

07818340016015672195269.jpg
There is an old copper mine in the Warner Mountains that doesn't show up on mindat as far as I can tell. It's located here: 


Lovely dendrites and layered copper minerals there.

18th Nov 2019 19:54 UTCMatt Ciranni

Are you talking about the Warner Mountains in southern Oregon?  
That looks like a lot of the banded rhyolite that is common in the inland northwestern United States- it's not valuable (unless it's jasper, or at least, hard enough to take a polish) but it is really pretty rock.  

13th Sep 2020 06:30 UTCAndrew C

Sorry for the delay! I was in NE Cali, so they might be the same mountains. I'm pretty sure these are copper minerals.

13th Sep 2020 15:18 UTCKevin Conroy Manager

The black patterns are likely manganese dendrites.   Please see: http://minerals.gps.caltech.edu/FILES/DENDRITE/Index.html 

29th Sep 2020 18:57 UTCAndrew C

Any way to check if they're manganese vs some other trace mineral?

29th Sep 2020 21:41 UTCKyle Beucke 🌟

If it is the black patches/dendrite, EDS would tell you.  If you think there is a significant amount of copper scattered through the rocks, an acid digest followed by ICP or AA would show how much copper (and a list of other elements) is present.  If you only see a small amount (tens of ppm or less?) of copper, it is unlikely that anything visibly abundant is a copper mineral.  

At the current time, there is a lab in the SF bay area providing EDS.  The wet chemistry bulk analysis is provided by various assay labs including a couple in Reno I can vouch for.

Kyle
 
Mineral and/or Locality  
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