Assaying, Microscopy, Mineralogy & XRF/XRD

Assaying, Microscopy, Mineralogy & XRF/XRD

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261
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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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894
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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
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215
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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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265
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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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319
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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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534
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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 Azblue
Thanks. 
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729
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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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440
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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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1061
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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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1322
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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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1020
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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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830
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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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914
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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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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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1087
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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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1057
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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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1291
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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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1157
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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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1057
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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...
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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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1186
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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 Todd H
Asarco did a lot of work on this back in the 1990's.  Bismuth has been looked at for a long time and has not been generally employed mainly do to cost.  They actually had a patent on the method. I ...
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1160
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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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1573
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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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1001
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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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Started by RGross
We recently found an anomaly in a mine that we have been exploring so we took a number of samples and checked them with two different handheld xrf guns. As you can see in the photos, the rock sample reads very high in Ti, Fe, Ni, Zn, Pt, and Au.  T...
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Last replied to by baserzey
And here have metalic ore on coal.. we will check it Again fire assay or I will try to melt   and check it again XRF..   What would you recommend  to me ?
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Started by Umar Alsheikh
Hello! my name is Uba Umar Alsheikh, an undergraduate student of Metallurgical and Materials Engineering, Ahmadu Bello University Zaria, Kaduna, Nigeria. Am working on the topic "Beneficiation of Manganese ore using Gravity and Magnetic separation te...
Last replied to by David
I hope you have taken a look at: https://www.911metallurgist.com/blog/manganese-ore-processing and https://www.911metallurgist.com/blog/flowsheet-manganese-ore-beneficiation-process-plant + https...
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Started by JRC
We are trying to process gold from arsenopyrite and chalcopyrite ore. Our XRF indicated that there was a high concentration of gold along with a variety of minerals. We have tried various methods of refining without much luck, due to all of the other...
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Last replied to by hck
Thanks for this information, Mine is a similar situation, we supply NaCN to most small scale miners in Tanzania. The Ore is about 70% copper and silver and mercury, leaving about 30% gold. The chal...
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891
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Started by PARIMAL BHATTACHARJEE
We are trying to recover gold, silver and magnetite from copper ore tail. 1) Is it in practice over the world either in lab scale or commercial scale and if so information regarding this? 2) Procedure of fire assay for determination of gold and sil...
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Last replied to by BAUD
Please, if possible, can you share the following elements pertaining to your copper ore tail? - the chemical composition - the mineralogical composition   - the size distribution of the solids - ...
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933
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Started by larissos
Good Evening, as a new assayer, Ι have some questions about the role in Fire Assay Method of "Fe nails" in fluxes We have two types of fluxes the "A" flux and the "B"flux Our choice between "A" Flux and "B" Flus depends on the sample' su...
Last replied to by .999
From the looks of the formula it seems to be a 1:1 ration of iron to sulfur content. 30 gram sample x .35 % sulfur content = 10.5 grams of sulfur. To this is added 10 grams of nails to convert the su...
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1296
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Started by MineralFrothFlotation
Which portable type of instrument can be use for checking the optical and chemical parameters of minerals at Mines site. Optical parameter specially Brightness . Chemical parameters like Al2O3 , Fe2O3, CaO , MgO , SiO2 etc .    
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Last commented on by MineralFrothFlotation
Yes Wielen specially limestone , china clay , barite type of minerals . Thanks a bunch.
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Started by blessed
Which is the appropriate method of determining composition of minerals from WEEE, pulverized or using them intact. Also which is the best method of recovery pulverized or intact.  
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Last replied to by Deano
Commercially you have two options for treatment of e-waste for gold and silver. First is a cyanide leach, second is smelting. Cyanide will leave behind pgms and any coated or encapsulated gold and s...
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1063
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Started by Rene
I would like to know what you would suggest. We have samples that normally requires that metallic portions be removed by screening on a 600um screen and this is assayed to obtain the gold value. The undersized portion is milled to 80% passing 75um. ...
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Last commented on by Rene
Hi Robert thank you for your reply. Yes, the metallic bits are screened out and assayed for gold - normally a very small portion of the original sample. This is done using a 600um screen. Some labs mi...
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1523
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Started by DORA DORA
Can XRF and XRD determine tellurium? If not, why? What analytical technique must be use in order to determine tellurides?  
Last replied to by David
I just know the Olympus.On https://www.911metallurgist.com/equipment/assaying/xrf-analysis/ Tellurium over 20 ppm See your old post https://www.911metallurgist.com/laboratory/tellurides-tellurium-...
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Started by alex
Trying to buy the right XRF X-ray gun to check SS sheets. 304 vs 316 vs 201 vs 430. Any recommendations? Used guns? Thanks.
Last replied to by David
Thanks Dominique, Alex: the Element will do what you want. The DELTA Classic Plus does what the Element does + more. The DELTA Professional does what the DELTA Classic Plus does + more. Th...
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Started by quwannar
Hi all, I live in Black Sea Region of Turkey. I found huge amount melting slags that I thought it belonged to an ancient mystery mine. in order to find out which metal was processed, I sent the slag samples to XRF analysis. Results are below. Fe; 1...
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Last replied to by max skinner
Rheomet, is correct. XRF on material this low grade is not good. I my lab, I would run control type fire assay, at least in triplicate. If it is very important I run 6 assays, throw out the high and l...
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2037
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Started by Charlie
Can you tell me what is a good/optimum/typical flow rate of slurry feeding an OSA "on stream analyzer" adequately? I need to size and purchase my sample pump to feed the multiplexer. Thanks!
Last replied to by David
Some say a primary sampler should extract 100–200 l/min of sample stream from the process. Others say it should be between 60-300 l/min, with the optimum flow to the OSA is 150 liters/min or 40 US ...

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