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Could this be a 20K find?


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I finally did the specific gravity test on this specimen and come up with 18.7529842126

The dry weight is 504

The wet weight is 205

The specific gravity is 335

What do you think? is there 583.274067963 grams of gold in this specimen?

100_9744.JPG

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There's got to be an error.  18.75 is pretty close to pure gold, and doesn't look it in my picture. When I did the formula below I got about 500/300= a specific gravity of less than 2, and pure quarts is around 2.6 or so.

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The Specific Gravity Test is used to calculate the gold content of gold nuggets that contain a mixture of gold and other materials. In this example of the specific gravity test, we use gold mixed with quartz.

Nugget weighed in air weighs 96 grams

 

Nugget suspended in water weighs 74.5 grams

96 - 74.5 = 23.5
96 divided by 23.5 = 4.17 (the specific gravity of the specimen)
4.17 - 2.63 (the average specific gravity of quartz) = 1.54
1.54 x 23.5 = 36.19.
36.19 divided by the constant 25.97 = 1.39 ounces of contained gold
1.39 ounces x 31.103 = 43.23 Grams of contained gold.

 

The specific gravity for quartz is 2.60 - 2.65.

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Ok complex math problems are not my strong suit so I decided to start over. 

Dry Weight 540g and Wet Weight using distilled water 358g

540 - 358=182

540 divided by 182 = 2.967032967

2.967032967 - 2.63 = 0.337032967

0.337032967 x 182 = 61.339999994

61.339999994 divided by 25.97 =2.361956103

2.36 onunces of gold

73.4639206705 grames of gold 

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Since gold with a specific weight around 18 is heavier than quarts with a specific weight around 2.6, if there's any gold in the sample, the specific weight of the rock would need to be greater than 2.6, but its less, so there's no gold in the rock.  If the rock had 73 grams of gold in it and it weight 540 grams total, the rock would be around 14% gold by weight or about 2% gold by volume.  If 1 in 50 parts were gold, I think you'd see it with your eyes or definitely with a 60 power loupe.

Some gold can be so small you might not see it, but that much would show up in an assay, so could be worth sending it in.  I'm sure in Tucson there's a pawn shop that has XRF analysis and maybe you can talk them into measuring your rock, or pay them a few dollars to find out the composition.

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11 hours ago, fishing8046 said:

Ok complex math problems are not my strong suit so I decided to start over. 

Dry Weight 540g and Wet Weight using distilled water 358g

540 - 358=182

540 divided by 182 = 2.967032967

2.967032967 - 2.63 = 0.337032967

0.337032967 x 182 = 61.339999994

61.339999994 divided by 25.97 =2.361956103

2.36 onunces of gold

73.4639206705 grames of gold 

Do you see ANY gold? I can't tell by just looking at the photo.

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12 hours ago, chrisski said:

Since gold with a specific weight around 18 is heavier than quarts with a specific weight around 2.6, if there's any gold in the sample, the specific weight of the rock would need to be greater than 2.6, but its less, so there's no gold in the rock.  If the rock had 73 grams of gold in it and it weight 540 grams total, the rock would be around 14% gold by weight or about 2% gold by volume.  If 1 in 50 parts were gold, I think you'd see it with your eyes or definitely with a 60 power loupe.

Some gold can be so small you might not see it, but that much would show up in an assay, so could be worth sending it in.  I'm sure in Tucson there's a pawn shop that has XRF analysis and maybe you can talk them into measuring your rock, or pay them a few dollars to find out the composition.

 

gold 1-13-19.html

gold 2 1-13-19.html

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Hey fishing4086, what does your metal detector tell you?  I agree with the others who posted.  if you can't see any surface gold the rock is useless as a specimen.  Crush it.  Get the gold out so we all can enjoy your recovery.

Bob

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On 1/12/2019 at 11:17 PM, adam said:

Dissolve that rock , let's see that gold!

I agree. Whenever I see a specimen like that, I always think about the potential of crystalline gold. Of course that means dissolving the quartz off with acid and involves a lengthy waiting period. I can't say with certainty that it contains crystalline gold but I'd sure hate to start pounding on it with a hammer only to find it does but ruined by hammering on it.

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Much better pics

17 minutes ago, fishing8046 said:

Here is a partial of both sides. This specimen is riddled with gold. The next thing I should do is put current through it. 

Would you crush it?

1 Capture.PNG

Capture.PNG

Looks like gold.  I did not see any in the original photos.  I'm excited to see what you do with this!!

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I'd either sell it whole or cut it into slabs and polish the quartz. Might look cool inside? Probably worth more as a speci.

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Personally i wouldn't crush it knowing now how much visible gold there is. I would try some HF before i crushed it. Might turn out pretty sweet. Awesome speci though.

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Oooohhh, that's a 'completely different' rock than the original pix..
I'd definitely shoot the juice to it checking for continuity..
Would probably slab and cab regardless..
Outside chance of leaving as is..

Swamp

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Well now,  seeing surface gold is a different story.  I recant my original crush suggestion.  Try getting the best specific gravity evaluation first and put the electric to it for continuity before you make any decision.

A friend of mine has a 48 pound (no kidding) piece of quartz with gold exposed on the surface.  He can not decide what to do with it.   I guess he is in the wait and see mode.

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