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2 people online in the last 1 minutes - 0 members, 0 anon and 2 guests. (Most ever was 44 at 17:01:08 Tue Nov 20 2012) |
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DanBrunner Offline 115 posts Reply |
Hey guys, I'm trying to figure something out. Do you guys know of any resources that list the typical qualities of gold by deposition / region? I'm trying to identify the origin of some gold I've come across. Any help would be greatly appreciated. Here's a sample of what I'm trying to place. In reality, the gold is actually a little more yellow than it appears in these photos.. My white balance was a little off on my camera.
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DanBrunner Offline 115 posts Reply |
Heres a better example of the color. Its the same gold as above, just not as close up..
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kurt_Blumberg Offline 477 posts Reply |
can't help you with the identification, but it certainly is purdy.
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jjedwab Offline 244 posts Reply |
It's surely a many-sided problem, since different minor elements, like Ag, Hg, Bi, may influence colour, hardness, wear, flattening and aspect.
The associated heavies should give some more clues, but most of all, the inclusions which are only visible in polished sections, observed under the reflecting microscope and analyzable under the EMP. The British Geological Survey has made extensive work in various regions of GB on gold provenance , resulting in several papers (google scholar--->"BGS gold provenance") There are several USGS publicationson on AK gold accessible via the web: http://pubs.er.usgs.gov/usgspubs/index.jsp |
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mldave Offline 62 posts Reply |
Think your way off base when saying California gold is this or that.In any one county alone the texture and colors will vary,whether placer/hardrock.Hell,even out of the same vein the gold can be very different.Should be papers on the fineness of the yellow and in Australia,spectography is used to prevent high grading as the gold from various locations must have it's own unique fingerprint..
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gpg Offline 20 posts Reply |
Yeah, I agree. If you had a fairly small area you might find someone who could tell you which mine or vein just by looking at it. Or if it was very distinctive, pink or green tint etc., but even that is repeatable in various locations.
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Manicminer Offline 164 posts  Reply |
There's a lot of quartz in them, you're not too far away from the source.
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Zooka Offline 2131 posts Reply |
Looks like several different sources there to me, based on color and wear and quartz content.
The down and dirty way to get a rough idea would be to get the fineness and the associated other metals by % from a selected sample. If you have all of the gold coming in at say 750 fine with 20%silver and 5% copper, look for an upstream mine with that historical fineness ratio. Doesnt always work; the gold we were getting in Manhattan Creek, NV came from 2 major sources, one close by (720 fine, very coarse/ featheryt/ wirey) and one 15 miles upstream (smooth smaller particles, over 850 fine). Or so we concluded. We might have been way off, too; there was an old volcano across the valley called Black Mammoth, and the gold they beeped off of its flanks was very high in fineness... There are old sources that list the fineness of the gold from all the mines in a region, I know that Ak has such a chart. -Z |
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