Guest Posted January 12, 2019 Share Posted January 12, 2019 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? Quote Link to comment Share on other sites More sharing options...
chrisski Posted January 12, 2019 Share Posted January 12, 2019 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. =================================== 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. Quote Link to comment Share on other sites More sharing options...
adam Posted January 12, 2019 Share Posted January 12, 2019 19 hours ago, fishing8046 said: is there 583.274067963 grams of gold in this specimen? Yes, If that rock is the size of a Buick 3 Quote Link to comment Share on other sites More sharing options...
Guest Posted January 13, 2019 Share Posted January 13, 2019 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 Quote Link to comment Share on other sites More sharing options...
adam Posted January 13, 2019 Share Posted January 13, 2019 Dissolve that rock , let's see that gold! Quote Link to comment Share on other sites More sharing options...
chrisski Posted January 13, 2019 Share Posted January 13, 2019 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. Quote Link to comment Share on other sites More sharing options...
Morlock Posted January 13, 2019 Share Posted January 13, 2019 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. Quote Link to comment Share on other sites More sharing options...
Alwaysdirty Posted January 13, 2019 Share Posted January 13, 2019 11 hours ago, adam said: Dissolve that rock , let's see that gold! Agreed, crush that thing and lets see 2 ounces of gold in a pan! Quote Link to comment Share on other sites More sharing options...
Chet Posted January 13, 2019 Share Posted January 13, 2019 This video shows two ways of calulating it. The most important part is obtaining the wet weight. Have a good day, Chet 1 Quote Link to comment Share on other sites More sharing options...
H-2 Charlie Posted January 13, 2019 Share Posted January 13, 2019 Crush it and pan it out . Quote Link to comment Share on other sites More sharing options...
Guest Posted January 14, 2019 Share Posted January 14, 2019 (edited) 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 Edited January 14, 2019 by Guest Quote Link to comment Share on other sites More sharing options...
chrisski Posted January 14, 2019 Share Posted January 14, 2019 The HTML links don't work. Brings me to a blank page. Quote Link to comment Share on other sites More sharing options...
Uncle Ron Posted January 14, 2019 Share Posted January 14, 2019 darn!!!! This scientific stuff hurts my brain! Ouch! 2 1 Quote Link to comment Share on other sites More sharing options...
Bugler Posted January 14, 2019 Share Posted January 14, 2019 Excellent demonstration, Chet. How about submitting the article to the ICMJ as well. Bugler Quote Link to comment Share on other sites More sharing options...
Boorx4 Posted January 14, 2019 Share Posted January 14, 2019 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 1 Quote Link to comment Share on other sites More sharing options...
Morlock Posted January 14, 2019 Share Posted January 14, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
GeoJack Posted January 15, 2019 Share Posted January 15, 2019 Xray. Done at local vet. Quote Link to comment Share on other sites More sharing options...
Guest Posted January 15, 2019 Share Posted January 15, 2019 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? Quote Link to comment Share on other sites More sharing options...
Relichunter2016 Posted January 15, 2019 Share Posted January 15, 2019 5 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? Slab it..... Quote Link to comment Share on other sites More sharing options...
chrisski Posted January 15, 2019 Share Posted January 15, 2019 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? Looks like gold. I did not see any in the original photos. I'm excited to see what you do with this!! Quote Link to comment Share on other sites More sharing options...
Desertpilot Posted January 15, 2019 Share Posted January 15, 2019 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. 2 Quote Link to comment Share on other sites More sharing options...
nugget108 Posted January 15, 2019 Share Posted January 15, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
Swampstomper Al Posted January 15, 2019 Share Posted January 15, 2019 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 1 Quote Link to comment Share on other sites More sharing options...
Sonoran Dave Posted January 15, 2019 Share Posted January 15, 2019 PM Eldorado if you want to slab it and don't have the equipment. He has slabbed many many specimens. He makes great jewelry from them as well. 4 Quote Link to comment Share on other sites More sharing options...
Boorx4 Posted January 16, 2019 Share Posted January 16, 2019 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. Quote Link to comment Share on other sites More sharing options...
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