[meteorite-list] Gold and Iridium content of meteorites (especially irons)

From: MexicoDoug <mexicodoug_at_meteoritecentral.com>
Date: Thu, 6 Oct 2011 01:43:25 -0400 (EDT)
Message-ID: <8CE5202000F48D0-1C14-21BEE_at_webmail-m064.sysops.aol.com>

Shawn wrote:

"What its suppose to say is 1.49 ?g/g Au and ug/g is a unit of mass
equal to one millionth (1/1000000) of a gram (1 ? 10?6), or 1/1000 of a
milligram. So if I did my math right, the new answer would
be............ .000048g per 32kg?"

Hi Mike and List,

I gave the answer of 0.03 g that might be left after refining with an
efficiency a bit over 50%. So, no, 0.000048 g per 32 kg is wrong also,
you went an extra 1000 the other way now. The correct answer,
extrapolated from the limited measurement zone is 0.048 g in the 32 Kg
mass, which at least is measureable on some scales we use regularly!

Good that was cleaned up, and I no longer feel like the black sheep
here (except for Rob who had the confidence to agree) It turns out this
wasn't in the Bulletin anyway, just the pending stage for editing since
MB 100 hasn't come out yet, these are the dangers of a taking data
still requiring proofing. When something is put in writing sometimnes
others won't question it, a human trait acquired during the ancient
Roman times from repeated floggings, and then passed to Galileo...

Kindest wishes
Doug






-----Original Message-----
From: Shawn Alan <photophlow at yahoo.com>
To: meteorite-list <meteorite-list at meteoritecentral.com>
Sent: Thu, Oct 6, 2011 1:18 am
Subject: [meteorite-list] Gold and Iridium content of meteorites
(especially irons)


Mike G and Listers,

I would say we struck gold in those meteorites :)..... My understanding
is I
thought Melrose (a) had the highest gold content, but again there are
always
discoveries being made everyday.

I am not sure who asked this but I was looking at a Melrose (a) slice
and on the
edge of the slice looking through a?60x loupe I saw a spec that looked
gold to
me. I rechecked it and kept looking and I have to say with other lights
I used
it looked like a gold spec to me, real gold.

Now back to the NWA 6932.... I think a few people said that there is
about 48g
in the total know weight of NWA 6932 because Mike said the gold content
was
listed at 1.49mg/g? Now Mike that would be true if it was 1.49mg/g but
thats not
the case. What its suppose to say is 1.49 ?g/g Au and ug/g is a unit of
mass
equal to one millionth (1/1000000) of a gram (1 ? 10?6), or 1/1000 of a
milligram.

So if I did my math right, the new answer would be............ .000048g
per
32kg?

On the other hand, Melrose (a) is .30oz per ton not sure who is higher,
but here
is an article on Melrose (a) about the gold content and its weight in
gold.

http://www.minsocam.org/ammin/AM19/AM19_370.pdf
?
Lastly, not sure if someone already?caught the weight typo but I
checked it on
the Meteoritical Bulletin Database for NWA 6932 and the gold weight is
1.49 ?g/g
Au not 1.49mg/g. Why I say this is I havent read all the comments about
this
post so I bet someone cought it already and I am just repeating what
has been
said or not. Any whos, take a look at the Melrose (a) write up and keep
on
rokkin.
?
Shawn Alan
IMCA 1633
eBaystore
http://shop.ebay.com/photophlow/m.html



[meteorite-list] Gold and Iridium content of meteorites (especially
irons)Michael Gilmer meteoritemike at gmail.com
Mon Oct 3 20:33:34 EDT 2011


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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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Received on Thu 06 Oct 2011 01:43:25 AM PDT