Other things besides gold make a red solution. Like rhodium.
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Bullion.Forum
PGM Help
- Thread starter MindyBeatty
- Start date
Help Support Gold Refining Forum:
Specific Gravity
Why would you think you have Rhodium in your ore or even other PGMs for that matter.
Rhodium and Iridium besides being exceptionally rarer than even Platinum are hardly soluble in concentrated boiling AR.
Hence the reason for the question about the Assay.
If there indeed are Rh or Ir in your ore you need a different angle of attack than AR.
I'm not a newbie. Thank you though.
Sorry but that is not an answer.
I suggest you get a proper assay before you put something nasty like Arsenic or worse into acid.
And take your stuff to somewhere and have it tested.
There will be Universities, pawn shops or similar that can test your sample relatively cheap.
For testing try, Coin corner in Trent avenue, for instance
Martijn
Well-known member
This was your question, right?
Gold and silver are not pgm's but pm's. Precious metals.
Silver would have formed white fluffy silver chloride in your AR.
Gold would have shown a purple to black stannous test result and will cement out in copper leaving all other base metals in solution.
Cementing on zinc cements out any lesser reactive metal that was in solution like iron, copper, tin, etc
We are trying to help but without a lot more information we are stumped , simply dissolving some rocks and their contents in acids proves very little , is there a reason for you to believe it’s possible you have platinum group metals in your rocks , is there a history of such materials in your area.
That is not correct information.
Actually, a dark brown stannous chloride test isn’t a false positive—it’s just a more concentrated version of the classic Purple of Cassius reaction. Gold chloride (Au³⁺) reduces to colloidal gold, which ranges from light purple to dark brown depending on concentration. If you’re getting brown, it just means there’s a strong gold presence. Chemistry doesn’t lie.
Not correct.
It will go from the well known light violet to increasingly dark until it can't be distinguished from black depending on concentration.
That is the reason we ask people to dilute their solution until they get a color that can be said to not be black.
I have never seen brown on my Gold bearing solutions only slight violet to black.
The sensitivity of Stannous Chloride is high enough that it will easily overpower our visual cues.
The dark brown is called false positive since many misinterpret them.
There may be many reasons to it, Copper salts and SMB is the most common reasons.
T
There were no base metals. Please see my reply about stannous chloride results to further educate yourself. Thank you though!
Educate yourself
How high did you push the pH before you filtered out the Hydroxides?
Did you do it in steps?
MindyBeatty, I counted 18 tactical errors in your first post. In an effort to be polite, I will stick with the first serious error.
Failure to assay your ore. Whether you perform an assay yourself (fire assays are fairly straightforward. See Bugbees book on assays that can be found in the library) or have one performed by a professional, the results of an assay provide the data needed to properly treat your ore for recovery of any values.
Most mines I was familiar with when I wandered about the American West had assay shops performing 20-200 ICP assays daily.
Failure to have assays performed demonstrates that you neither know what your ore contains, nor how to recover any precious metals.
My advice: Learn. Failure to do so will only result in more failures.
Now put your toys away safely, and hit the books. Let’s start with something easy. Read Hoke. Refining Precious Metal Wastes, even 80 years since first publication, is still the best primer one can obtain. It is available in the library.
Read Hoke again. When you are finished the second time through, you will better understand the language and terminology.
Read it a third time. Write any comments and questions and post them here.
Perform EACH of the acquaintance experiments Hoke presents. Most need to perform some of the experiments several times before they understand the processes.
The same learning technique will apply should you decide to learn assaying. Start with Bugbee. Read several times. Write notes, comments and questions.
Until you make the decision to learn what you should be doing, failure will continue.
Yes, I am rude. Thank you for noticing.
Time for more coffee.
Failure to assay your ore. Whether you perform an assay yourself (fire assays are fairly straightforward. See Bugbees book on assays that can be found in the library) or have one performed by a professional, the results of an assay provide the data needed to properly treat your ore for recovery of any values.
Most mines I was familiar with when I wandered about the American West had assay shops performing 20-200 ICP assays daily.
Failure to have assays performed demonstrates that you neither know what your ore contains, nor how to recover any precious metals.
My advice: Learn. Failure to do so will only result in more failures.
Now put your toys away safely, and hit the books. Let’s start with something easy. Read Hoke. Refining Precious Metal Wastes, even 80 years since first publication, is still the best primer one can obtain. It is available in the library.
Read Hoke again. When you are finished the second time through, you will better understand the language and terminology.
Read it a third time. Write any comments and questions and post them here.
Perform EACH of the acquaintance experiments Hoke presents. Most need to perform some of the experiments several times before they understand the processes.
The same learning technique will apply should you decide to learn assaying. Start with Bugbee. Read several times. Write notes, comments and questions.
Until you make the decision to learn what you should be doing, failure will continue.
Yes, I am rude. Thank you for noticing.
Time for more coffee.
