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jjedwab
09:33:46 Fri
Dec 20 2013

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Cheap micropanning

The recipe of: "Cheap micropanning with a Petri dish" is again available through GOOGLE archive:

Go first to: https://groups.google.com/forum

Then ask for the group: "alt.mining.recreational" and finally for "cheap micropanning with petri dish".

The problems of an easy or commercial access to an electron microprobe are still there, but there are cheap solutions too..

JJ

  
geowizard
14:24:23 Fri
Dec 20 2013

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Re: Cheap micropanning

JJ,

I still have the JSM-T300 Electron Microscope. It was removed in working order from the University of Texas at Austin. Members of the forum probably think this type of equipment is far from reach, but it comes up on the auction block on occasion.

It has been in storage while I have been busy looking at gold from a macro view. On the lower end of the electromagnetic spectrum, geophysical surveys are revealing a view of the earth never seen before.

From the petri dish to the airborne geophysical survey, it's a broad realm. Scan a petri dish or scan Moore Creek; the discoveries are waiting to be made.

I use a binocular optical microscope at Ophir to view rock samples at x1 to x32 magnification. Through those lenses, I have viewed gold as few have viewed it before.

"Where does gold come from? It comes from the rocks. I cannot see what my eyes cannot see." - Geowizard

The microscope and in your case an electron microscope with electron micro-probe is the ultimate tool to view the world at the nanometer level. Hard for many to conceive the notion of x200,000 magnification.

Carlin, Nevada in the US, is a good example of the discovery of nano-gold. If no-one had looked and if no-body could "see" it might have never been discovered!

The micro-probe adds the dimension of micro-probe assay. Although, the assay is on a particle by particle basis, a root elemental analysis is practical. Certainly must be nice to walk into a room of welcoming academians that can't wait to peer at the viewing screen, discover what is "under the lens" and begin probing.

Thanks for the interesting link.

- Geowizard

  
jjedwab
15:15:13 Fri
Dec 20 2013

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Re: Cheap micropanning

Actually, it is not the gold (only) that I have in mind, but the "critical materials" that are still waiting in AK (and elsewhere). If the micropanning is well adapted to glittering minerals, it is also good for most heavies, like REE-minerals. Aimed at filling a gap between a find of something unknown (or unconspicuous) to the guy in the field and his fore runners, and the large array of rare materials now wanted by modern industry.

I am of course hoping for the development of a hand-held EMP (electron microprobe) able to detect and analyse a micron-size particle, but this seems still far away.

JJ

  
geowizard
15:27:00 Fri
Dec 20 2013

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Re: Cheap micropanning

JJ,

Yes, and that is the true value of electron micro-probe assay. There remain to be seen many elements that here-to-fore have remained unseen because of the failure to apply the appropriate tools.

The State of Alaska is an exception. The geologic studies conducted of the past 100 or more years have included shipping pan concentrates to the University of Alaska - Fairbanks, UAF, for a complete elemental evaluation. The results have been published in the many reports that are available - most of them online.

Rare-Earth Elements have only been recognized recently as having application in the technologies that have evolved. That demand has renewed the interest in looking further at the samples that have been collected from all over the state and are stored in boxes at UAF. The State of Alaska has had recent symposiums (symposia) on the subject. Exploration companies are aware - yet the tools and the access to the tools remains a challenge.

One of the problems that I see is that the levels of occurance of the needed REE's are very low and detection of them places an extraordinary demand on analytical methods.

- Geowizard

  

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