My biggest bit yet with the sdc2300

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Post  big fella on Sun Dec 30, 2018 8:15 pm

Gday Jen well done and looks good.
Regards big fella
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Post  adrian ss on Sun Dec 30, 2018 11:09 pm

Hi Jen
Congrats on the gold speci.
There seems to be a bit of confusion on the forum re calculating the amount of gold in qtz.
Do This:
Weigh speci dry in air accurate to at least two decimal places.
Then place your container of water on the scale and tare the scale then suspend the specie by cotton in the water without the specie touching the container.

The figure obtained is the "Loss Of Weight " of the speci. Divide this figure into the weight in air and multiply this by the sg of clean distilled water at 20 degC and the result is the SG of the speci. For our rough purposes assume the sg of water to be 1.
If your speci is mostly qtz matrix then use this table to calculate the % gold in the qtz then multiply the dry weight by this percent and the result is the gold weight in the qtz. Result is approximate only. ....(It is a percentage so remember to divide the result by 100).

EG SG = 3.88 x dry weight 180.54g = 66185/100 =66.18g gold weight.....For me that is a lot of gold in that rock so be sure your weights are correct.

https://www.gold-prospecting-wa.com/gold-in-quartz-table.html

Cheers
Adrian


Last edited by adrian ss on Tue Jan 01, 2019 8:11 am; edited 4 times in total
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Post  big fella on Sun Dec 30, 2018 11:16 pm

Gday. Kon61 was very close and I believe Adrian that your on the money too. Now for my question do we calculate for different types of rock being attached to gold. Does it make much difference in outcome ?.
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Post  adrian ss on Mon Dec 31, 2018 7:36 am

It can make a significant difference if the surrounding matrix is sandstone,Latterite, ironstone etc that has different sgs to qtz.
Using the sg of qtz will very often get you into the ball park.
See this list of various mineral specific gravity.
The accuracy of the determined sg of the rock surrounding the gold is very important when determining the weight of very small amounts of gold in the rock.
https://www.911metallurgist.com/blog/list-table-of-specific-gravity-of-minerals


Last edited by adrian ss on Tue Jan 01, 2019 11:49 am; edited 1 time in total
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Post  Jen on Mon Dec 31, 2018 11:54 pm

Thankyou all for your replys

I was all for just smashing it in a dolly pot. Glad i was talked out of it Laughing
One never knows whats hiding within
So amazed what that ugly quartz was hiding.


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Post  Redfin on Tue Jan 01, 2019 8:48 am

That cleaned up very nicely, a fantastic piece.
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Post  adrian ss on Tue Jan 01, 2019 11:02 am

Jen wrote:Well here it is.
Wow! Now it’s beautiful... prickly. But oh so nice now it’s out of its host rock  Twisted Evil

There was some really fine gold as well. That I didn’t place on these scales
All up it weighed 63.3 grams.

My biggest bit yet with the sdc2300 - Page 3 93763110



Wowzers Jen that is fantastic. No wonder the 23 got it at 15 inches.
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Post  Wombat on Tue Jan 01, 2019 7:45 pm

It cleaned up great Jen Well done.
wombat Wink

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Post  Jen on Wed Jan 02, 2019 1:08 pm

It sure did come up nice. The photo doesn’t do it justice

Thanks again everyone
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Post  Kon61gold on Wed Jan 02, 2019 6:45 pm

My apologies for the late response to your question there Big Fella.
Adrian pretty much summed it up nicely. To accurately separate & determine the specific gravity of all/any individual foreign matter, mixed in with, or attached to the quartz, would require some serious scientific laboratory work, which for us detector/prospectors would be a little to far fetched. Leave that one for the egg heads to figure out.  Laughing
What you want to know is how does one get close enough to working out the amount of gold in quartz.
When calculating for the amount of gold quantity in quartz, most tend to go by the average specific gravity of quartz, 2.63 (an average in between figure). Quartz's specific gravity (SG) falls mostly between 2.60 to 2.7. I'v played around in the past with many a different specific gravity of quartz figures, when trying to calculate what best SG of quartz figure to use, in order to be dead on the amount of gold content, contained within any mixture of quartz type/gold specimen, only to fall short on my findings.
I eventually settled on what I believe, would be a close enough safe bet, without going overboard in gold content, by using a specific quartz gravity figure of 2.67 instead of 2.63, (allowing for the extra weight of other foreign minerals).
This formula by no means is the do all end all, but one can safely bet that in a speci of many ounces, one would be close enough to the actual real gold content held within that specimen, than being 20/30% off.  Shocked
The formula used is this

Dry weight of Jens specimen = 180.54
Wet Weight    "    "    "    "    =  134.0
180.54 - 134 = 46.54
180.54 divided x 46.54 = 3.87
3.87 - 2.67 (SG of quartz) = 1.2
1.2 x 46.54 = 55.84
55.84 divided by the constant (25.97) = 2.15 ounces of gold content or
2.15oz x 31.10gm = 66.87 grams of gold.

Cheers Kon. T25
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Post  big fella on Wed Jan 02, 2019 9:49 pm

Gday Thanks for replies. I still think I'll look at my species and say nice and try to find nuggets lol! Thanks again as it is a question that comes up around many a camp fire.
Regards big fella
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Post  Hoffs Gold on Sat Feb 09, 2019 10:08 pm

Amazing 2oz Kinder surprise, looks beautiful Jen Congrats. T06
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Post  nanjim on Sun Feb 10, 2019 12:21 am

Jen
That cleaned up nicely looks good

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Post  Jen on Sun Feb 10, 2019 2:02 pm

Thanks Hoffs Gold & NanJim

It sure surprised me to see it go from an ugly “rock” to what it is now.
I am sooooo glad a few talked me out of placing it into a dolly pot  Laughing
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Post  AnnieL on Tue Feb 12, 2019 7:27 pm

Wow, great find there Jen Very Happy
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Post  G.B. on Wed Feb 13, 2019 11:14 pm

Well done Sis.
Yep I'm
Still alive and kicking.
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Post  Jen on Thu Feb 14, 2019 1:00 pm

AnnieL wrote:Wow, great find there Jen Very Happy

Thankyou AnnieL


……………………………………………………

G.B. wrote:Well done Sis.
Yep I'm
Still alive and kicking.

Thanks baby Bro Very Happy

Glad to hear your still alive and kicking.  Q27
Real life always comes first.
Say hi to the family Q39
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Post  nuggetseeker on Sat Feb 16, 2019 9:57 am

well done Jen looks great
Cheers John

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Post  slimpickens on Wed Mar 13, 2019 4:52 am

Go on Jen, smash it! You never know there might be a beautiful crystal piece of quartz inside it. Rolling Eyes
Seriously though, that is one impressive nugget Jen, and I am so happy for you, (it's brightened up all our days), Harry
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Post  Detectist on Wed Mar 13, 2019 7:53 am

A very belated congrats Jen. I'm not sure how I hadn't seen this post previously but gees what a great find and what a great looking bit of gold after cleaning. More???
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Post  the hill folk on Thu Mar 21, 2019 9:12 pm

Hey Jen..... when you say that "hard caprock" agre you meaning that tough layer over the top of deep rocky, stony, gravely old river delta's? There is some of this around Elaine and I often wonder whether it could contain gold although commonsense tells an the gold would be on the lowest layer and not in the capstone conglomerates.

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Post  Jen on Fri Mar 22, 2019 11:45 am

the hill folk wrote:Hey Jen..... when you say that "hard caprock" agre you meaning that tough layer over the top of deep rocky, stony, gravely old river delta's?  There is some of this around Elaine and I often wonder whether it could contain gold although commonsense tells an the gold would be on the lowest layer and not in the capstone conglomerates.

Hi

Well i am no geologist
All i know is its different in W.A

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Post  Nightjar on Fri Mar 22, 2019 1:53 pm

If you read "Bloody Gold - David John" ... https://www.amazon.com/Bloody-Gold-David-John/dp/0958809909 (Not easy to get a copy these days so they maybe pricey.)

He found the renowned Goanna Patch, WA on the theory that gold lay below the cap rock. The locals told him he had rocks in his head. Reluctantly the bank loaned him $1000.00 to hire an excavator from Leinster to dig a costean which exposed a glory hole. (David passed away only a few years ago on his Goanna Patch)





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Post  the hill folk on Fri Mar 22, 2019 2:43 pm

There's always things that just don't make sense but there's the gold!!

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Post  Willo on Wed Apr 03, 2019 5:21 pm

I am so glad you dd not crush it Jen - two ounces wow that is amazing hope you keep it safely away. Well done Ian
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Post  Jen on Thu Apr 25, 2019 5:01 pm

Willo wrote:I am so glad you dd not crush it Jen - two ounces wow that is amazing hope you keep it safely away. Well done Ian

Thanks Ian

Yep, its packed away.   Somewhere scratch  
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Post  Jen on Sun Apr 28, 2019 5:21 pm

T01  everyone

Sorry if i didnt answer some of you.  Appreciate all your great reply’s

Now we shall what this years W.A season may give us.

T15
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