Assaying, Microscopy, Mineralogy & XRF/XRD

Assaying, Microscopy, Mineralogy & XRF/XRD

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170
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Started by koki
Why after fire assay of shavings/drillings of gold i don't get 99.99% Au, still witnessing Ag
k
Last replied to by koki
Am using Ag as collector
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17
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Started by Goldensing
Had some drilling completed and the samples  have been assessed using XRF although no AU was identified. I'd like to know if the gold could be locked up in sulphides which is common for the mine region. What elements are the best indicators to look ...
Last replied to by David
Additionally, what is the ANALYZER's LOW DETECTION LIMIT? Often, it will not see anything under 20 grams/ton An XRF will give a sample surface reading only.  ie: a 1/4" diameter nugget inside a 1"...
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191
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Started by bezelsunl
I work for a jewelry company and want to get a full analysis of the metals we use. Them being stainless steel alloy, 10k, 14, and 18k. Gold. I was recommended to use a fire assay but after asking around I notice companies require at least 30g of samp...
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Last replied to by DAlchemist
Conventional Fire Assay would not be the way to determine the metal content of your jewelry. The fusion of the sample ideally slags off non-precious metals, although some nickel and copper may report ...
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172
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Started by koki
why when I do XRF scan after Fire assay I don't get 99.99% still witnessing silver
J
Last replied to by Jorge
After fire assay, it is common the presence of silver and other minor elements. Pure gold is not possible to get. A gold refining process will not produce pure gold. See link below, https://www.911me...
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164
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Started by koki
is it possible to collect PGM's with litharge, not flux by thermal analysis, please elaborate
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Last replied to by Jorge
A cupel has the property of absorbing oxide of lead and other oxides, such as those of copper, bismuth, zinc, etc., which are soluble in oxide of lead; while metals which do not oxidize in the atmosph...
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161
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Started by koki
Am starting a test work on fire assay, what should be the ration of flux to the sample for both high and low grade samples, may i have a reason as well please. thanking you in advance
Last replied to by SmartDog
see: https://www.911metallurgist.com/blog/fire-assayand: https://www.911metallurgist.com/blog/fire-assay-flux-litharge-composition  
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216
VIEWS
Started by koki
are there any uses of soil from the slime dams for community purpose
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Last replied to by Jorge
That material is good for remediation when the mine has to close the operation. 
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258
VIEWS
Started by koki
i received a sample of activated carbon charcoal and used XRF to determine the loaded gold then i found that it was between 68-70% Au, my question is: how do i extract gold from the activated carbon charcoal
k
Last commented on by koki
thnx Jorge
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277
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Started by koki
my question is how do i convert back the final concentration i obtained from titration to represent the whole lot, cause am only taking 100mL from roughly 150L. My final concentration from titration i calculate in "g/L
k
Last replied to by koki
thank you Jorge
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245
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Started by koki
When i do fire assay on high grade gold sample they often come out from the muffle malleable and when hammering the prills they get broken what can i do second question fire assay come low compared to hand held XRF on high grade gold samples
k
Last replied to by koki
Thank you Jorge
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291
VIEWS
Started by BiancaM
I'm using a handheld XRF device for random field analysis in my magnetite plant. I take a wet magnetite sample from my feed to plant and get a Fe% of 58.72 % but when I let the same sample dry and I measure the Fe% with the same handheld XRF device,...
Last replied to by SmartDog
Let's take a quick look at this, R1 is reading 1, R2 is reading 2.  R1 is made up of S (sample) and W1 (water at reading 1), R2 is made up of S (sample) and W2 (water at reading 2).  If W1 > W2 t...
3
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880
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Started by Azblue
Hello, everyone. I am a researcher in a small laboratory for a start up community-owned au&cu mining company. As of now, we are planning for preliminary tests of the au contents of some ores. I would like to ask from your experiences for an effective...
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Last replied to by DAlchemist
Were you able to determine a suitable flux recipe?
0
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309
VIEWS
Started by Shaltout
We have S6 Jaguar WD XRF from bruker with rhodium tube, We use #SmartQuant stadardless calibration coming with the device. Our goal to measure Rhodium percentage in some paint, Ink and pigment samles. I attempted to add the Rh k1 line myself to th...
2
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1559
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Started by Marshal Meru
We are currently doing our fire assay fusions with a bismuth flux based recipe. I am curious about a stable bismuth recipe. We are using 60 parts sodium bicarbonate/20 parts bismuth recipe. I am curious if the sodium bicarbonate is too much, and I wo...
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Last replied to by mamabear8709
We are currently trying to switched from lead flux to Bismuth. We are also trialing how to find the best recipe. What can we do? 
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686
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Started by Han
  First of all,for the processing of gold and tellurium ores,how exactly does the pos-roasting(calsine ores contain % 60- 62 Fe ) process work,what is the way to obtain tellurium. Second,which do you prefer for chemical analysis,aquea regea or fi...
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Last replied to by Jorge
The presence of impurities in lead buttons usually influences adversely the accuracy of assaying. In general, the errors caused by impurities in cupellation may be either positive, due to retention of...
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1356
VIEWS
Started by Zandarkoad
Hello all! Was hoping you could help me identify a block of metal. It has the markings:BMCC2 4200PN XN 950160 88.https://drive.google.com/file/d/1Y1OVFW5WhvF5VZrl4EaTNBdT-hBf-cIs/view?usp=sharingI'd like to take a sample in for assaying or chemical a...
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Last replied to by EG Pepito
Hello Sir, Please help me identify this kind of metal with code 160 88 35 C208B PN XN 950 BMC  1330   Thank you.   Pits
1
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547
VIEWS
Started by LIMA
Hi, I’m working on a wavelength dispersive x-fluorescence analysis technique for the determination of chemical elements from unknown samples. We use Omnian from PANalytical for elemental analysis. I want to know how to ensure the validity of the ...
Last replied to by David
https://www.911metallurgist.com/assaying-mineralogy/panalytical-omnian-calibration-problem/
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599
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Started by MRBLUEEYES2010
Couple questions :    What are the proper temps and times for curing bone ash as a bedding material.     
Last replied to by David
In the mean time, read https://www.mdpi.com/2071-1050/12/7/2988/pdf and https://www.researchgate.net/publication/305822458_The_Ash_from_Fluidized_Bed_Combustion_as_a_Donor_of_Sulfates_to_the_Portland_...
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724
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Started by rlarue
Hi, I am a geologist exploring some old alluvial workings which have a reported average Au grade of under 1g/m3.  The gold is very fine at under 500 microns and is disseminated within very coarse grained to pebbly alluvial sandstone.  My aim is to ...
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Last replied to by Jonas
Hi rlarue, The low grade won't make XRF accurate but there is an optical analyzer that can do what you are looking for, check: https://www.911metallurgist.com/equipment/gold-detector/  
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1020
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Started by cstott
Hello, I'm new to this forum so thanks in advance for any help. We regularly send out gold solution for reclaim but I would like to find a better way of knowing what to expect from this solution and obviously AA isn't the best option for this. Everyo...
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Last replied to by
The gold CIP process is a non-filtering cyanide carbon slurry gold extraction process that uses activated carbon to directly adsorb and recover gold from cyanide pulp. It includes the preparation of l...
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761
VIEWS
Started by Devon2017
i have been mining now for a couple years in barkerville and recover a couple buckets of sulphides every season, my claim neighbor crushed some of the sulphides and got a bit of freegold when panning, he then sent the crushed tailings out for assay, ...
Last replied to by SmartDog
Maybe, possibly, it depends. Was the sample he sent out representative of your material?  Was his sample representative of his material?  Did the lab do a good job?  Has he sent out other samples ...
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1358
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Started by
Can anyone give me some information on how I can calculate the price per ton on gold concentrate i will attach the analysis report 
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Last replied to by sbccbalaji
Are you a trader of gold concentrates or a refiner?  
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1642
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Started by Nipher
On a gold Mine set up, can we entirely depend or use a 56 element handheld XRF Analyser for analysis of gold in solution, gold in carbon, gold in bullion, gold in solid samples from geology? We are used to the use of the Atomic Absorption Spectromete...
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Last replied to by SIMetallurgist
Gold in bullion, gold on carbon yes. In ore it is not as reliable I have found.
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1322
VIEWS
Started by Millza79
All,   Can anyone please let me know the pros or cons for the following methods on a polished thin section taken from a section of drill core:   SEM-MLA vs Optical microscopy   Thanks  
Last replied to by David
MLA - SEM Pro’s Identification of gangue minerals based on chemical content (XRF) and back scatter. Generally very accurate identification of sulphide minerals. Automated methods to identify s...
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1114
VIEWS
Started by Ahmed Zaky
i want guide to how to reach with my lab to be international certified lab in gold fire assay and what is the newest  astm method for gold fire assay in geological ores
Last replied to by David
Are you looking for an ISO certification? Labs like www.actlabs.com are ISO 17025 accredited and while I know a lot about the practical aspect of the operational side of it, we have a quality manager ...
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1218
VIEWS
Started by aufinder
I wanted to see if anyone knows this matrix and picture of the crystal specimen next to it ? Tellurides I believe but is crystal from Calaverite and is matrix of the orange red grains pebbles almost pure gold oxide111 of same ?...thanks for input on ...
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Last replied to by Todd H
What is the magnification we are looking at?  A simple XRD scan would tell you exactly what this is. Regards  
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1918
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Started by VINCENT4442003
Which of these two testing method is more accurate, advanced and appropriate? Also, I have a spent catalyst that contains 1% platinum, can the purity increase after pre-treatment and refining? 
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Last commented on by patel10679
Yes I will provide you, how to concentrate Platinum from catalyst waste.
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1385
VIEWS
Started by Javad
I'm looking for effective methods of analysing acid grade flourspar.  Any help, ideas or putting me in the right direction to find some information about this, would be greatly appreciated.
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Last replied to by Javad
Hi SmartDog.  Thanks for the link.  I actually had seen this before and I read it.   I'm wondering if there is anything more recent out there.  Any new technologies?  I've read about NMR and se...
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1330
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Started by mohammed_tawfik
anybody familiar with that specific test, is it  conclusive ?  does it give accurate results ? anyone have the full procedures with calculation  what is the lowest ppm does it work for? we have small scale mine and we don't have atomic adsor...
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Last replied to by Bhaduri
This is called a Chiddey assay & I have tested this against AAS in the 80's...we consistently got better results w/the Chiddey method...however it is labor intensive & time consuming...note that consi...
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1602
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Started by Imelda
Hello, I am Imelda from Indonesia In my company, i worked as a melting staff. I used fire assay. They gave me example 27,5% gold sample for analyzing. They want me to check if the concentration is right or not. The flow chart : take .... mg of samp...
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Last commented on by Bhaduri
A comprehensive guide & refresher to Fire Assaying is provided in a down loadable text by Bugbee; https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwj56oWV-IbeAh...
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1440
VIEWS
Started by CSwart
I am looking for market prices in (USD per metric tonne) for silica sands, marble, dolomite, natural gas, quartzite, kaolin, attapulgite, bentonite, and the list goes on.  I have searched on LEM, but it only specifies metals. Is there a specific we...
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Last replied to by Craig M
Here is the location of summaries, by year for all principal mineral commodities.   https://minerals.usgs.gov/minerals/pubs/mcs/      
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1343
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Started by sircrouch
Good day im currently doing my practicals in metallurgy at Germiston in a Sampling plant, im struggling to start a project as part of my curriculum i have no mentor whatsoever any ideas on how i can go about just enough for me to calculate compare an...
V
Last replied to by vpmaasdorp
Like Todd H said, you need to be more specific. Start off by deciding what your project is about. Then read up on similiar projects to understand what you expect to achieve with this project. Once...
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1463
VIEWS
Started by n3133
Hi guys,           I'm interested in learning more about XRF analysis in the potash industry, it would be great if some of the questions can be answered XD Is XRF analyzer the only type of analyzer used to measure potassium concentration in ...
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Last replied to by Siddiquf
Have you considered flame photometry? Bench top XRF should work in the open shed, but instrument will be damaged if exposed to water. For best results minimize temperature fluctuations around the XRF...
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1890
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Started by el_francis
Hi there, I'm completely new to 911 Metallurgist, but maybe someone here can help me out! I'm looking for studies that characterize the gold particle size distribution in different geological deposit types (I'm a geologist).  I would like to know h...
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Last commented on by el_francis
Thanks for the BGS link, the section on bedrock gold is definitely what I'm looking for, but for a big enough number of deposits to look at things statistically. I would be very interested in any oth...
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1306
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Started by Sohwohn
Hello all! I am 28 years old. I lived in Hong Kong and visited China two months ago. I have a Bachelor's in Information Technology and I have never worked in this field until recently. I have been arranged to 'learn' assaying ore samples here. My fat...
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Last commented on by Sohwohn
What I'm thinking right now is to add some chemicals into the furnace so that the Zn Pd Fe compounds can be more easily vaporized. I'm reading some materials and have an idea but haven't tried yet. T...

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