Help, I'm new in this area

[carcrossguy]

Since when is mercury expensive in Venezuela. The internets says it is cheap and readily available there.

 

[eeTHr]

Oscarpastcer---

If you have an ounce of gold per kilo, you should be able to see the gold in there. If it's too small to see, use a magnefying glass. And you could just pan most of it, in an hour or less for a kilo. One ounce per hour is pretty darned good, unless you have tons of the stuff.

If the gold is very, very, tiny, you could probably just put water in there and float most of it.

If it's a little to big to float, you should use a Miller table.

After that, refine it if you want. That way, you'll know your purity, and can't be fooled.

 

[Oscarpastcer]

Hello again, well I'm posting the pictures =)





After that pictures, I want to show you some pictures about the process, first the leaching process. with HCl and NaOCl at 50°C and about 4 hours
¬


After the leaching process, I separate liquid/solid and the liquid was this, I't supouse to be gold in solution there



After that, I added meta bisulfite to precipitate, but there wasnt precipitate, and the colour turn in green



The metabisulfite, is old, I dont know if theres a posibility to blame the chemical, or the process, or the sample, but the sample has gold, because the sample has worked with mercury amalgam and extract gold.

 

[Barren Realms 007]

Have you tested with stannous?

 

[Oscarpastcer]

Have you tested with stannous?

Yes, and the test, was positive

 

[Barren Realms 007]

Do you get any smell when you add the SMB? does it have clumps in it idictaing that it might have come in contact with moisture? You can mix some up in water and wave your hand across the top of the container towards you and see if you get an odor but be careful doing it, and don't take a deep breath when doing it.

 

[HAuCl4]

Oscar: Have you performed a fire assay of your sample to verify that there really is gold in that particular sample?.

Is the material from your mine or someone else gave it to you?.

Put a piece of copper in the liquid and if there is gold, it should drop as a brownish powder. Silver will drop too.

If you are going to do this in a big scale, cyanide is a better way to go.

I'm in Caracas, by the way. 8)

edit to add: If those concentrations of 1 Oz per Kg are true, those are very high grade concentrates. Standard procedure is to smelt them and produce a clean dore bar, before further refining.

 

[carcrossguy]

I can bearly see any yellow in the liquid 60 ml. Should be darker if there was substantial gold.

 

[Lost_Adams]

Oscar,
If there is 2.2 oz of AU in a Kilo of "soil".
This can be verified by taking an oz of the material and mixing with equal
amounts of either Baking Soda (CHNaO3) or Borax (Na2B4O7·10H2O).

http://www.geus.dk/program-areas/common/int_ssm_fact_sheet_07.pdf

These are fluxs and work fine on any charcoal source. ie Barby Briquettes

You should get a small bead of Au from 30gm of material that weighs>>
1 kilo = 15 432.3584 grains
15 432.3584 grains / 1000gm = 1.5432 grains per gram ed(15.5432 gr)
30gm sample of soil x 15.432gr per gm = 462.96 grains
462.96gr/ 15.432gr/gm = 30gms
462.96gr / 24gr/dwt = 19.29 dwt
In inch's this would be a Sphere about .566 in dia.
this large a sphere would SQUAT and take on a flattened shape,
To visualize the size of a grain of gold in spherical form
it would be 0.073" inches. This corresponds to the Size of a #9 lead pellet in a shotgun shell for shooting Birds.

Hope this helps!
Sincerely
Bill Adams

Just noticed my calcs were off by a decimal point Sorry About that it was late when I posted that response. (3-29-11)

 

[dtectr]

Did you have to pay anyone for this information and/or sample?

make sure you're using "sodium metabisulFITE as a precipitant, not -bisulFATE . just a thought ...

EDIT: has anyone checked out "Mintek"? http://www.mintek.co.za/index.php

 

[Oscarpastcer]

Did you have to pay anyone for this information and/or sample?

make sure you're using "sodium metabisulFITE as a precipitant, not -bisulFATE . just a thought ...

EDIT: has anyone checked out "Mintek"? http://www.mintek.co.za/index.php

Yes was sodium metabisulfite, N2S2O5

 

[Oscarpastcer]

Thanks adams for your information. I'll put in practice

 

[Lost_Adams]

Oscar, I lost my post and don't want to retype it. here is a link to something you may want to check out.

http://www.butlerlab.com/

If you want the Excel Spreadsheet, I made, on the size of gold beads and theirs weights from 0.001" to 0.50" in 0.001" increments just give me a PM and I'll send it to you.
Sincerely
Bill Adams

 

[butcher]

the green solution looks more like base metals than gold solution, although a stannous test may show positive it will show positive for very low concentrations of gold.

I feel you may have leached base metals.

assay your solids.

base metals will leach before gold will, and if you still have base metals in the "DIRT" you still have any gold in those solids.

what pretreatment did you do to this ore? what base metals and what state are they in in this dirt?

for that green solution I would try using copper to precipitate any values, instead of using sulfite, if any precipitate formed then I would retreat it.

 

[wildbill_hickup]

eeTHr,
I'm with you. I would try panning first. Water sure is cheaper that all those acids, etc. At the concentration he is talking about even a handfull should leave dust in the bottom of the pan. I'm certainly no expert but I have done some panning up here in Vermont and New Hampshire and I have spotted some pretty small flecks of gold in the pan (don't make anymoney but it's fun) As you said you should probably see some gold just by looking at the sample. 1/2 ounce per pound. I'd concider myself lucky to find 1 grain in a pound here. Even if there were alot of heavies in the mix I would guess that panning would at least reduce the volume of materal some. To me there sounds like something is wrong here. :roll: IMHO

 

[Oscarpastcer]

Hello, well I was focus in the lab, trying to recover some Au, but with no success, uhm I dont know which is the problem, I use HCl at 30% and add NaOCl at 10-15% about 5 min.

The sample of the crushed rock, this crush is about under the 150 micrometers.

The leach is 150 cc HCl and adding 5 cc every 5 minutes ten times, in other words 50 cc of NaOCl total.

A minerologist told us that in the rock was Gold, she doesnt know how exactly it is, this week I'm going to do an SEM (scanning electron microscope), to knowe the quantity exact of Au.

If, the AuCl3 after put some SMB, turns in a solution clear, almost transparent, its that ok, I dont know if the solution of SMB is correct, also I use the stannous cloride test, but I have my doubts. The stannous cloride solution is need to be all diluated, I mean clear transparent, or it is okay if is milky (white) like Hoke in his book says.

Does anyone one can help me whit this doubts please.

 

[butcher]

Gold in ore can be a complex of metal salts, (acid + base or metal = salt), most all leaching will need pretreatment of ore, usually concentration, and roasting, sometimes additive are added to the roast to change the metals chemistry, base metals are usually removed before values, sometimes the chemistry of base metals can make leaching almost impossible till you convert their chemistry.

Ammens book is very good read for Ore, got mine from action mining up north of here in Oregon.
Also some of the old mining books are a wealth of information.
I would look into assay, and determining the chemistry of your ore, then look into way's of dealing with these.

 

[Lost_Adams]

Oscar, Have you done the fire test with the assay and the borax???
If so what was the result???
This is a Difinative test for AU in any form. If it's in your sample you will get a Gold metalic bead that will be an alloy.
If you DO NOT get a bead then your sample HAS No AU or so little that you lost it in the crushing and panning part of the processes.
You will then need to question the people who are telling you that the SAND has GOLD in it.
No matter how much we want to wish or hope we have RICH concentrates or head ore it is just not always true.

I have a man who says he is going to pay me to come and dig up his gold he has on this property. He has said that I can have a share, but I told him I didn't want a share, but I just wanted my wages for doing the sampling work. He said that he would give me a bonus WHEN we found the AU.
When I looked on the Geologic Maps of the area I was able to ID a potentional Ancient River Channel very near there with a possible feeder on his property. But then I saw that the Lake behind the dam was at 280' elevation. The Highest point on his property was 350' and the lowest 320'. So even IFFFFF every thing else is a go then we will hit WATER at 40' and will have to start pumping. NOW this wouldn't be a problem normally, BUT there isn't enough land to make Setteling Ponds to clarifiy the water befor it goes into the Lake. And this is all AFTER THE PROPER PERMITS AND ENVIRONMENTAL IMPACT STATEMENTS are gotten.

But I'll still do the sampling and give him my report and receive my wages and expenses for my work.

Sincerely
Bill Adams

 

[Oscarpastcer]

Thanks Adams for your answer, and about your question, no I havent, I havent do the fire test yet, I read Ammen and I found it how to do it, and I will do, when I got the result I'll let you know thanks

 

[Oscarpastcer]

God day, I have some concerns, I think my gold isnt precipitanting beacuse there is Cl in the solution, ok what I have to do is boil the solution, but how much boil? the frist bubbles? or Ill have to wait a lilttle more? after the boiling i diluated the solution 3 times with water? and after that ill put the SMB?