Hi Yinan
First you need to realize that the heavier the elements the less
abundant they are due to the stellar processes that form them. Once
you get to the heavies, everything is in ppm and there are no selective
element gold smelting operations that anyone has come up with in the
generally violent yet docile forming solar system.
There are variations of course, but within those variations there are
practicval limits and generally Earth is the King of differential
geological processes as the largest terrestrial planet, so we are
unique. Now, we are talking of a factor of 1000 times; you will need
an awsome concentrating mechanism for that ... which obviosuly doesn't
exist except in fantasy as far as we chemists can tell. Raising gold
concentrations while keeping all the other trace metals withing the
normal parametersis completely illogical and therein lies the key to
answering you. I mean, when you can find me a mountain range made of
solid gold on earth, I'll take the idea more seriously ;-) Then we can
explain how a mountain range of solid gold spontaneously formed and
that would open the doors to even more golden age science fiction.
Tahks Sterling for the links to my Dad's old favorite story, I still
have his original pulp magazine here of The Girl from the Golden Atom,
and a surprise in the yellowed pages in the letters to the editor - my
Dad's having something to say about the stories he was being fed.
Genetics trump environment!
I posted something else here which was intended to clinch the gold
situation, but it hasn't gone through. I will try reposting, so sorry
if you get it twice.
Kindest wishes
SDoug
-----Original Message-----
From: Yinan Wang <veom...@gmail.com>
To: MexicoDoug <mexicod...@aim.com>
Cc: meteoritemike <meteoritem...@gmail.com>; Meteorite-list
<Meteorite-list@meteoritecentral.com>
Sent: Tue, Oct 4, 2011 1:25 am
Subject: Re: [meteorite-list] Gold and Iridium content of
meteorites(especiallyirons)
But Doug,
Who says the solar system is uniform and that this iron can't have a
higher than average gold content?
On Earth you certainly have ore bodies that have significantly high
gold content (although much less than this meteorite) and then you
have areas with no gold at all. Why can't this iron be from a source
that just happened to have a higher than usual gold content?
Btw, anyone got a sample of this stuff around?
-Yinan
On Tue, Oct 4, 2011 at 12:31 AM, MexicoDoug <mexicod...@aim.com> wrote:
Hi Mike, Stuart and fellow astrochemisticists,
The Bulletin is not a peer reviewed place, it is just the world being
held
on a few Atlas' shoulders who are nice enough to slave over it and an
occasional inaccuracy could happen. Perhaps it was an issue of
optical
character recognition since mu, the prefix for micro (as in
micrograms)
looks a lot like an m, if you put your astronomer's cap on you'd
suspect
that the simple explanation it is just a run of the mill typo that
will now
be corrected.
But ... since we haven't analyzed this meteorite, we can't be sure.
For my argument that it is hogwash that this meteorite would have all
that
gold (so, the bigger picture is, that don't spread the idea that
there are
up to 48 grams of gold in a 32 Kg chunk of iron meteorite or folks
will
forget where it came from and the next thing we know the newspapers
will be
proclaiming that meteorites are loaded with gold).
OK my argument, referencing Anders & Ebihara, 1982, yes the same
Anders that
(karmaca) Martin kindly contacted not too long ago who invented the
term
"poor man's space probe" for meteorites, showed that in the Solar
system
there is nearly one hundred-million times more iron than gold in the
elemental abundances in the Solar System. Well, if an iron meteorite
has in
round numbers, 900 mg/g of iron (90%), then moving the decimal over 7
zeros,
we get 0.000009 mg Au/g, which is 0.009 mg/g which is 9 ug/g.
Granted, 9 is
off by a factor of 6x more than is reported for the meteorite but at
least
we are not a factor of nearly 200 off (1500 ug/g = 1.5 mg/g).
That's all I can say, based on a nice guy's work from 1982... but I'm
less
peer reviewed than the Bulletin so we need someone who is closer to
the
analysis. Or, perhaps go through a bunch of irons with published
analyses
and just see if anything is over say, 10 ug/g, in which case that
would make
a far more interesting story than a footnote to an analysis on what
star
made all that gold and why. Was it the home star of Girl from the
Golden
Atom? Did their society get obliterated? Did the incredible
shrinking ray
malfunction when reforming their marriage ring? And what of our
adventurous
and debonair young and gifted chemist? Stay tuned till next time ;-)
Kindest wishes
Doug
-----Original Message-----
From: Michael Gilmer <meteoritem...@gmail.com>
To: MexicoDoug <mexicod...@aim.com>
Cc: Meteorite-list <Meteorite-list@meteoritecentral.com>
Sent: Mon, Oct 3, 2011 11:00 pm
Subject: Re: [meteorite-list] Gold and Iridium content of
meteorites(especiallyirons)
Hi Doug and List,
It sounded awfully high to me also, but what do I know? LOL
Quoted below is the text from the write-up. Notice, the gold content
is the only element listed in milligrams.
Here is the text from the Met Bull write-up :
Northwest Africa 6932 (NWA 6932)
(Northwest Africa)
Found: 2008
Classification: Iron meteorite (ungrouped)
History: Reportedly found in the Algerian Desert
Petrography: Plessitic octahedrite with isolated (<5% of area) sparks
and spindles of kamacite; longest bands are ~8 mm long and 0.2 mm
wide. The material may be reheated; the fine plessite has a granular
appearance and there are small dark ellipses that may reflect
resorption of phosphide. No heat altered rim was recognized. Stucture
Opl.
Geochemistry: Composition: 4.51 mg/g Co, 69.8 mg/g Ni, 82.4 μg/g Ga,
380 μg/g Ge, 12.0 μg/g As, 4.12 μg/g Ir, and 1.49 mg/g Au. The
meteorite has no close compositional relatives. For example, in the Co
range from 6.2 to 7.5 mg/g, no ungrouped iron has a Au content within
20% and only Guin and Laurens County have Ir contents within 20% of
that in this iron, but these irons differ in several other
compositional respects.
Specimens: Several additional masses are known.
Best regards,
MikeG
PS - I am having internet connectivity issues and my connection is
running about as well as a 500-pound man right now. So I think I will
sign off until tomorrow morning and hopefully it improves then. LOL
--
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On 10/3/11, MexicoDoug <mexicod...@aim.com> wrote:
No way Mike, that there are 48 grams of gold in that 32 Kg hunk of
tkw.
... Unless this is such an anomoly that comes from the Star of the
Woman of the Golden Atom, I think none of this makes any sense and
that
the units are micrograms per gram ( μg/g ), and if that is the case
there is not 48 grams of gold in them thar TKW, haha, more like a
total
of 0.03 grams in the whole 32 Kg mass to go refining. And if you
read
it somewhere, there is the possibility that the reference is wrong.
Was the article peer reviewed? (my comment isn't ;-))
Kindest wishes
Doug
-----Original Message-----
From: Michael Gilmer <meteoritem...@gmail.com>
To: Sterling K. Webb <sterling_k_w...@sbcglobal.net>
Cc: meteorite-list <meteorite-list@meteoritecentral.com>
Sent: Mon, Oct 3, 2011 9:45 pm
Subject: Re: [meteorite-list] Gold and Iridium content of
meteorites(especiallyirons)
Hi Gang,
I was just curious about exactly how much gold is bound up inside a
meteorite with a higher than average content, like the one in this
example.
Personally, I share the same sentiment as most of you - it would be
heresy to destroy a meteorite to extract something that is available
here on Earth, even if it wasn't cost-prohibitive.
At 41 years old, I have made it this far in life with terrible math
skills, so this old dog isn't going to take any refresher courses. I
was hoping one of the more skilled (and intelligent) members would
act
as a human calculator and cipher this question for me. :)
So in this particular case, the 32kg iron meteorite contains ~1.5
troy
ounces of gold, with a current market value of ~$2550.
What sparked my curiosity was the apparently high gold content that
was measured in milligrams and not the usual micrograms one expects
to
see.
One last question, perhaps rhetorical in a sense, has anyone ever
seen
gold in a meteorite? I mean, has there ever been a visible "bleb" or
gold inclusion in a meteorite? Or is all of the gold bound up on a
molecular level and invisible to the naked eye and 10x loupe?
I guess there won't be a gold rush to the asteroid belt....
Best regards,
MikeG
--
-------------------------------------------------------------------------
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Galactic Stone & Ironworks - Meteorites & Amber (Michael Gilmer)
Website - http://www.galactic-stone.com
Facebook - http://tinyurl.com/42h79my
News Feed - http://www.galactic-stone.com/rss/126516
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On 10/3/11, Sterling K. Webb <sterling_k_w...@sbcglobal.net> wrote:
1.49 mg per gram is one part in 671.
1/671 of 32 kg is 47.7 grams of gold.
There are 31 grams per troy ounce; gold
is priced in troy ounces; there are 1.537
troy ounces oif gold in that 32 kg, or
$2551.94 at today's (10/03/11) price.
Cost you more than that to extract it...
Sterling K. Webb
-------------------------------------------------------------------------
-
----- Original Message -----
From: "Stuart McDaniel" <actionshoot...@carolina.rr.com>
To: "Michael Gilmer" <meteoritem...@gmail.com>;
<meteorite-list@meteoritecentral.com>
Sent: Monday, October 03, 2011 7:57 PM
Subject: Re: [meteorite-list] Gold and Iridium content of
meteorites(especiallyirons)
Oops, I was wrong.....It would be
32,000gr / 1.49mg = 21475 mg
21,475/1000 = 21.475 gr
Right, anyone??
Stuart McDaniel
Lawndale, NC
Secr.,
Cleve. Co. Astronomical Society
IMCA #9052
Member - KCA, KBCA, CDUSA
-----Original Message-----
From: Michael Gilmer
Sent: Monday, October 03, 2011 8:33 PM
To: meteorite-list@meteoritecentral.com
Subject: [meteorite-list] Gold and Iridium content of meteorites
(especiallyirons)
Hi List,
In perusing through the latest additions to the Met Bulletin today,
I
was reading the compositional data for NWA 6932 (iron, ungrouped).
I
noticed that the gold (Au) content was listed at 1.49mg/g. Is this
sort of data as straight-forward as it appears, or is there more to
it
that this layman is missing? In other words, how much gold is in
this
meteorite? The TKW of this meteorite is 32kg. So, with 1000g in a
kilo, and 1000mg in a gram, how much gold is in this celestial hunk
of
iron? (my math is horrible)
Second question, what is highest known gold content in a meteorite
and
what meteorite is it?
Third question, some meteorites also have high iridium content.
What
is the highest known iridium content in a meteorite?
I am not suggesting in any way that meteorites should be refined or
melted down to extract their precious metals content, but given the
high value of metals such as gold and iridium, has any profiteer
tried
such an endeavour? Or would the process be too complex and
expensive?
Best regards,
MikeG
-------------------------------------------------------------------------
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Galactic Stone & Ironworks - Meteorites & Amber (Michael Gilmer)
Website - http://www.galactic-stone.com
Facebook - http://tinyurl.com/42h79my
News Feed - http://www.galactic-stone.com/rss/126516
Twitter - http://twitter.com/galacticstone
EOM -
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