"GoldBug University". Ore photo's, tips, hints, etc.

[stoneware]

A question for Rick, the quartz came from an area known for Arsenopyrite, after milling I roasted it.

With the gas's escaping from the milled quarts the heavies settled out in layers, top tan then brick red, next we have a light colored black before running in the dark black.

I've passed neither of the blacks are magnetic, curious what it might be.

This morning brought a small sample up to red heat, no change on the black material

 

[kjavanb123]

Hi

Some updates on concentrate from coarse and fine parts of that yellow soil limonite.

Smelting and cupeling it didn't produce any beads.


So hopefully tommorow I will smelt and cupel a sample from the yellow soil without concentrating it to see if gold is bounded with limonite.

Hi

This smelting the gravel from that yellow soil also didn't produce any beads from cupeling so that yellow soil is limonite without any PMs.

Here is a shot of cupel after it was done


More gravel sample from dried rivers smelting and cupeling coming up.

 

[stoneware]

A question for Rick, the quartz came from an area known for Arsenopyrite, after milling I roasted it.

With the gas's escaping from the milled quarts the heavies settled out in layers, top tan then brick red, next we have a light colored black before running in the dark black.

I've passed neither of the blacks are magnetic, curious what it might be.

This morning brought a small sample up to red heat, no change on the black material

View attachment 50769
View attachment 50772
View attachment 50771

View attachment 50774

Incinerated the black material, its a sulfide.

 

[kjavanb123]

Hi

I collected 2kg of soil from drainage right below the main quartz vein that were mined before.

Smelting and cupeling the coarse part produced a bead which confirmed the existence of gold and silver in that soil.

Here is a shot of that silver bead.


Since soil sample collected from the drainage on the far right side of the quartz vein didn't produce any beads therefore one can tell about placer gold in the down stream by looking at the quartz vein on the upper levels.

Thanks
KJ

 

[goldshark]

After looking at a few of your pictures, I pose a couple of questions;
1. Did you periodically stir your roast, to a complete dead roast?
2. Did you add any collector metal to your "assay", including proper fluxes?
3. Did you try to assay and cupel at the same time?
Please give a description of your assay technique and steps taken.

 

[Junior2021]

Metallic Ores produce various Colors as they oxidize, and therefore stain the Host Rock(s) that contain them.
These stains are called Gossans.

The following is a list of the various Gossan Colors.

Yellows, Browns, Maroons, and Reds = ... Various Iron Oxides.
Black = ........................................ Manganese Oxides.
Green = ....................................... Nickel
Greens and Blues = ........................... Copper Sulfides, Oxides, Carbonates, Etc.
Bright Yellow = ................................ Molybdenum
Waxy Green = ................................. Native Silver, or Silver Chloride.
Oranges and Yellows = ....................... Arsenic
Pinks and Purples = ........................... Cobalt

Here are a couple of Outcrop Photo's.
One showing Gossan Colors, and One without.

View attachment 3687View attachment 3688

The following is a list of Rock Types, and Metal Associations.

Granite = ........................... Gold and Silver.
Olivine Gabbro = ................... Platinum, Chromium, Nickel, Cobalt and Iron.
Dunite = ............................. Platinum and Chromium.
Peridotite/Peridotite Dunite = ... Nickel, Chromite, and Platinum.
Serpentinite = ...................... Platinum

The Following is a list of Gemstone, and Rock Type Associations.

Almandine = ......... Diorite, Hornfels, and Schist.
Andradite = .......... Granite Pegmatites, Carbonates, Hornfels, and Skarn.
Grossular = .......... Skarn, Marble, and Hornfels
Pyrope = .............. Peridote Dunite, and Gabbro.
Spessartine = ........ Granite Pegmatites, and Blue Schist.
Uvarovite = .......... Serpentinite, and Peridote Dunite.
Corundum = .......... Syenite, Nepheline Syenite Pegmatite, Hornfels, and Gneiss.
Beryl = ................ Granite Pegmatites, and Schist.
Tourmaline = ......... Granite Pegmatites, and Schist.
Spinel = ............... Hornfels, Marble, and Gabbro.
Topaz = ............... Granite pegmatites.
Zircon = ............... Granite Pegmatites, Diorite, Nepheline Syenite, and Carbonatite.

Muito obrigado, sensacional um ótimo aprendizado.

 

[kjavanb123]

After looking at a few of your pictures, I pose a couple of questions;
1. Did you periodically stir your roast, to a complete dead roast?
2. Did you add any collector metal to your "assay", including proper fluxes?
3. Did you try to assay and cupel at the same time?
Please give a description of your assay technique and steps taken.

Hi goldshark

Please see my response as following;

" After looking at a few of your pictures, I pose a couple of questions;"


"1. Did you periodically stir your roast, to a complete dead roast?"

No roasting was conducted.


"2. Did you add any collector metal to your "assay", including proper fluxes?"

Yes, I always add lead oxide produced from previous smelting along with equal volume parts of flour.

For Flux I use 2 parts soda ash, 1 part borax and 0.5 part silica sand.

Flux and lead oxide flour are mixed prior to smelting.



" 3. Did you try to assay and cupel at the same time?"

No, they are done separately. I clean up the lead button from any slags before cupel.


" Please give a description of your assay technique and steps taken."

As I described in my previous post, I start the furnace with an empty crucible in it till it is yellow hot, then I add the concentrates, then flux/lead oxide/flour mix is added.


I wait for the bubbles in the melt to seize then pour the melt into a conical mold.

Thanks and best regards
KJ

 

[goldshark]

Please accept my apologies, I was looking at Stoneware's roast, and then combining with the pics of your assay, my fault. I have never seen a cupel finish like in your pics though. Is that a pre made cupel, or some other home made type?

 

[kjavanb123]

Please accept my apologies, I was looking at Stoneware's roast, and then combining with the pics of your assay, my fault. I have never seen a cupel finish like in your pics though. Is that a pre made cupel, or some other home made type?

No problem. I make my cupels with cement in a steel bowl. Here is another cupeling from smelting one more sample.

 

[bfloyd4445]

all greek to me

 

[stoneware]

Incinerated the black material, its a sulfide.

After roasting.

 

[dkbinco]

wow dude, I dont know if you are still around, but I live in the mineing districts in CO. I collect samples form different gold bearing areas here. I went through a big time mine tour recently and the veins they were chaseing are purple in colour, some went 3 ft. some a mile long., some 1 in wide and some a foot or wider, but all they collected was that dark purple looking rock. I was 1000 ft. down and there is 36 sq. miles of tunnels. 10 levels put out 2 mill in 70 yr. stopped in 1961 when gold went to $35 an oz. HA! so anyone have a comment anyhow.

 

[Richard36]

We

wow dude, I dont know if you are still around, but I live in the mineing districts in CO. I collect samples form different gold bearing areas here. I went through a big time mine tour recently and the veins they were chaseing are purple in colour, some went 3 ft. some a mile long., some 1 in wide and some a foot or wider, but all they collected was that dark purple looking rock. I was 1000 ft. down and there is 36 sq. miles of tunnels. 10 levels put out 2 mill in 70 yr. stopped in 1961 when gold went to $35 an oz. HA! so anyone have a comment anyhow.

Would enjoy seeing some photos of such.