Hard Rock Pocket Gold

[Twobrothers]

Can anyone here say they've ever seen it or run across it ? Any stories pictures or knowledge you're willing to share? For clarification I am not talking about Eluvial h2o+gravity concentrated pockets but pockets of gold found exploring a lode deposit.

 

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[Twobrothers]

Been exploring a quartz vein in granite country rock. A friend told me he got gold out of it in the eighties with a shaker table. Trenches with a couple short adits, coyote holes and inclined shafts. Not easy to get to and whoever opened it back in the day somehow got an air compressor up there to run a drill. Mineralization is pretty standard for the area (geothite limonite iron layered quartz, iron pyrites). In areas in addition to the quartz and granite there are layers of very soft altered material that for lack of a better word I refer to as chlorite. Very very soft in comparison to the vein or country rock. Coloration is from white to blue to iron iron iron brown (with inclusions of sandwiched iron (oxides, and geothite) to sometimes interestingly enough 'gold' colored. If it's gold gold then it's not like anything I've ever seen or recognized as gold.
Thanks for knowledge pictures enclosed.

 

[Assembler]

Some pictures off the internet. Some are hydro formed.

 

[Twobrothers]

View attachment 1535972 View attachment 1535968 View attachment 1535969 View attachment 1535970 View attachment 1535971 View attachment 1535973 View attachment 1535967

Some pictures off the internet. Some are hydro formed.

Thanks Assembler. You're a real internet librarian to the hard rock forum.

 

[Assembler]

More pictures.

Some more pictures.

 

[Twobrothers]

View attachment 1535972 View attachment 1535968 View attachment 1535969 View attachment 1535970 View attachment 1535971 View attachment 1535973 View attachment 1535967

Some pictures off the internet. Some are hydro formed.

Can you offer any further context on pictures 1,4, and 6?

 

[Twobrothers]

Some more pictures. View attachment 1536097 View attachment 1536098 View attachment 1536096

Any context you can provide on these?

 

[Assembler]

All the rock pictures respond to a metal detector and have visible gold as told by the owners.

 

[Goldwasher]

Most of those don't really look like "pocket gold" The spongy stuff kinda does.

get this book

 

[Goldwasher]

Research Seam gold seam diggings and gold in shear zones.

Get a copy of Fists full of gold it goes over different deposits including what I mentioned.

 

[Twobrothers]

Research Seam gold seam diggings and gold in shear zones.

Get a copy of Fists full of gold it goes over different deposits including what I mentioned.

Thanks for the resource recommendations

 

[Twobrothers]

Very interesting. Thanks Assembler. Unfortunately I don't have metal detector to test with. Up to this point I've done all prospecting visually. An MD-20 is high on my wish list.

 

[Assembler]

Very interesting. Thanks Assembler. Unfortunately I don't have metal detector to test with. Up to this point I've done all prospecting visually. An MD-20 is high on my wish list.

The MD 20 will see gold that you may miss with your eyes. Be prepared to replace the cable on the unit when it acts up. The MD 20 can be a lot faster then one's eyes. Usually if you find visible gold there is some more near it. A 4" - 5" coil on a Gold type metal detector can find wonders.

This one thinks the Pocket Gold book is a good start and have talked with Tom Bohmker.

 

[StreamlineGold]

You can also have ore running many oz per ton with no reaction to the md20 at all.

Id say most lodes have pockets..it could be a geologic feature along the vein that causes more gold to drop out of solution than other areas.

But I do think the ore looks good. Probably not high grade but still has potential.

 

[smokeythecat]

All good advice. An assay will give you the real dirt on it.

 

[Twobrothers]

All good advice. An assay will give you the real dirt on it.

Haven't had it professionally assayed yet. Home fire assay gets a hit which is encouraging.


this is the resulting prills from two assays of the same sample. Don't have a scale that weights to the milligram.

Used
15 Grams Sodium Carbonate
25 Grams Borax
10 Grams Litharge
5 Grams KNO3
5 Grams flour
40 gram sample

Melted to liquid until it didn't bubble anymore, collected and cupeled the lead.

Got one prill measuring 0.384mm the other 0.336mm

Sample was from a little scoop off the top of the sack of millings I have for the material from that site. So a pretty homogeneous mixture of the last 15 pounds that I ran through the rod mill.

 

[StreamlineGold]

How big is the bead?

 

[Twobrothers]

How big is the bead?

Don't have a milligram scale. Used digital calipers took five measurements of each averaged than and got one prill measuring 0.384mm the other 0.336mm

 

[Jim in Idaho]

If my math is correct, the bigger prill is about .000569 grams, roughly 2.4 cents worth at $1,330/oz...Nice!
Jim

 

[Twobrothers]

If my math is correct, the bigger prill is about .000569 grams, roughly 2.4 cents worth at $1,330/oz...Nice!
Jim

If it was all gold anyway. Need to rustle up some nitric acid.

So at 0.000569 Grams out of a 40 gram sample that's:

0.000569g/40g = x/1,000,000g (1 metric ton)

X=14.225 Grams of silver-gold doré per tonne (1,000kg) or

0.000569g/40g = x/907184.7grams (USA short ton)

X= 12.904 Grams per USA short ton aka
0.415 ozT silver-gold doré per short ton

Thanks. Where did you get the mm to prill weight estimation info?
I tried to do it once based on the area of a sphere and the density of different blends of silver gold alloys and came up with around 1/3 oz of silver-gold fore per ton assuming a 60:40 silver gold ratio (prill is basically silver colored).