Assaying, Microscopy, Mineralogy & XRF/XRD

Assaying, Microscopy, Mineralogy & XRF/XRD 2017-04-04T06:57:57+00:00
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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...
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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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...
Last replied to by Dario L
A cordial greeting, as in the other comments has the basis of how the XFR pistol works but we must take into account that these pistols make a "superficial" analysis of the sample as they say the manu...
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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...
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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Started by Ace Levy
I’m provided two tests on refractory gold ore (sulfide & carbon). The result was surprising. I don't understand why in minerals processing I cannot find any papers or websites about it. I'm interested in the "invisible gold" as the size of the gold...
Last commented on by giom
do you know how to refine invisible gold . i do have some problemes with refining a gold ore i found 3 years ago its grinded like powder its yellowish irefin it with aqua regia and get result as a ora...
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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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Started by ASHUTOSH SHANDILYA
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 .    
Last commented on by ASHUTOSH SHANDILYA
Yes Wielen specially limestone , china clay , barite type of minerals . Thanks a bunch.
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Started by Carmen Ibanz
Field measurements performed on soil, rock, ore, waste etc using instruments such as portable XRF may not always be as accurate as laboratory analyses, but they can be performed in large numbers with little cost. They may therefore help to select the...
Last replied to by Moneer_Noor
is it work for Magnesite Ore?  
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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.  
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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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. ...
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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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...
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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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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Started by Tobi
How best can one determine the total elemental composition of a substance/sample after been roasted?
Last replied to by inOr
My understanding is that XRF is a semi-quantitative  technique.  Measurements of concentrations of elements are not very precise, so low concentrations give meaningless results.  You don't say whic...
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Started by Standartenfurer
In mining and exploration, geologists and sample preparation technicians take a lot of care to correctly collect, sub sample and prepare a powder (pulp) of the original sample (usually starting a original lot of 1s to 10s of kilograms). Often the las...
Last replied to by Auggie
Some very interesting comments.  I've been in the assaying business for over 30 years and it always starts with the bulk sample, does it representative of the body of ore.  We would get bulk samples...
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Started by xvayia
Hello,  I am early researcher in XRF analysis and am wondering if it is finally so necessary the binder in pressed pellets or not. Someone advised me not  to use it, due to  the effect in matrix. Is is possible? Most of my analyzed samples are ge...
Last commented on by xvayia
Thank you very much for you response!
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Started by Bill Fraser
Can somebody tell me the effective area/volume that is analyses by a hand held XRF? I'm experimenting with a Niton hand held GOLDD+ device reading some fine grained samples and want to get an idea of what proportion of the lot is being analysed with ...
Last replied to by Bill Fraser
Well the final outcome of this experiment is that I came to conclusion is that PXRF is not going to work on mineral sands due to the significant matrix effects. I may revisit this another time when I ...
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Started by Zander Barcalow
I'm interested if anybody has tried out the Niton direct rock sampler (especially on drill core).See http://is.gd/BR0Cf2Would be particularity interested to see how this validated against half core samples
Last replied to by Oberstorm
I have not yet bought this clever tool (a battery grinder fitted with a dust collector) but this obviously something that may allow more representative rock analysis on field than direct shooting.Comp...
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Started by John Koenig
I'm interested to hear from fellow members on the type/manufacturer of XRF instrumentation that are in use for the determination of the following bauxite parameters: Total Al2O3, Available Al2O3, Total SiO2, Reactive SiO2 and Fe2O3. We have a PIMA MA...
Last replied to by Ace Levy
The comments on the importance of sample preparation for accurate XRF analysis are well placed. The entire process chain can be considered, finding the right balance between material type, sample size...
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Started by OberstGruppen
I'm looking for some published information relating to differences between press-powder and glass fusion preparation for nickel laterite deposits. If you point me in the right direction particularly the likely shortcomings of pressed-powder in terms ...
Last replied to by Unterstarm
The grain size is critical. On a project we worked on (not Ni laterite) variable grain size produced by LM5 pulverizing produced an unpredictable low bias between 0-20percent. It was impossible to con...
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Started by Zander Barcalow
Is an adjustment factor required to convert specific gravity to bulk density? And if so is it based upon mineralogy?
Last replied to by Tony Verdeschi
Couple of other pieces of information necessary: Are the place, timing and time where you want Bulk Density to be measured!Bulk density will depend heavily on the condition of the material - pre-blast...
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Started by Sandeep Bisht
I have been calling suppliers of XRF analyzers trying to look for a handheld XRF machine that maintains good accuracy without having to prepare the sample i.e. no crushing and pulverizing. Essentially I would like to shoot a beam at a freshly blasted...
Last replied to by Maya Rothman
LIBS are less represented here because it is still by far more experimental than pXRF. Its promising points are a better aptitude to deal with light elements and the possibility to use it at distance...
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Started by Sugar Watkins
Process mineralogy is a term that is used in a lot of contexts from process optimization to geometallurgy but its usefulness and application is often clouded by misconceptions that it is too hard or “our ore body is homogeneous and simple”. I fee...
Last replied to by Bill Fraser
Totally agree. I found most people in the minerals processing world do not value the fundamental research much. They would rather spend $ on inefficient and ineffective testing regimes instead of look...
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Started by Victor Bergman
Can an XRF analysis well high sulfide samples. High grade ore chips or flotation concentrate?
Last replied to by Carmen Ibanz
The portable XRF can very well handle mineral concentrate analysis very accurately such as columbite, tantalite, cassiterite, monazite, etc.
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Started by Marshal Dienes
I am working on a V-Ti deposit that is hosted in a magnetite bearing gabbro and are planning open pit mining of the recently defined reserve. As mineralisation was visual I have abundant assays of the ore (several thousand) but very few (a few hundre...
Last replied to by Marshal Dienes
Yes seeing DL for S in the 100-200 ppm range on SOIL Mode with 100 second read time, and most rock material 200-1000+ppm. Readings are quite low compared to S standards and calibration (post-) require...
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Started by Bill Fraser
Nice video, but as ever the diffraction get to do all the exciting stuff and us XRFers are left with analyzing cement and oil etc. Although, we do on occasions get to do some unusual tasks (see one of my recent posts) X-ray crystallography ...
Last replied to by Bob Mathias
Let’s distinguish two processes: data exportation and data importation. Of course I don’t have experience with all XRF software but I worked and tried some of them and they offer at least few data...
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Started by David Kano
I´m new in this interesting in Data Interpretation in qualitative analysis and hope you can help me with this:I have a powder Ag sample (containing little quantity of Ag2O) and have performed a WDXRF qualitative analysis (Rhodium target) with the ...
Last replied to by David Kano
Thank you all for these valuable contributions! In fact, I also analysed this sample with the LiF200 crystal and these peaks don´t appear.
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Started by Maya Rothman
What kind of samples do you XRF measure with semi-quantitative (or Standardless) package instead of a conventional calibration? And why? It seems that more and more analysis are made with semi-quantitative (or Standardless) package. Most of the tim...
Last replied to by Bill Fraser
The fundamental parameters (FP) approach to calibration in XRF is based upon the theoretical relationship between measured x-rays and the concentrations of elements in the sample. It takes into accoun...
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Started by John Koenig
What's the most difficult application you have worked on with your Handheld XRF Analyzer? In the spirit of the group theme I am interested in having people share their experiences with their most difficult XRF application. It would be great to have...
Last replied to by Tony Verdeschi
Excellent point! If you you are not going to do some sample prep to homogenize the sample then you probably should take an average of a bunch of single spot analyses to come closer to a better overall...
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Started by Alan Carter
Does anyone know how deep generally a hand-held XRF HHXRF analysis can go in the sample? I believe it depends on the sample's density, but I'm looking for a general idea. In my case I work with rock samples.
Last replied to by Victor Bergman
Great discussion. I am particularly impressed with Pol's unique Taste and Analyze recommendation. If your analyzing powders, presumably in a sample cell and using a tripod mount, then I would use a f...
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Started by Helena Russell
I am analysing some refractory material in which Carbon content determination is essential, I am using Woechast Wax as binder to prepare a pressed pellet.But i fear that Carbon present in wax will alter the results. Have anybody idea?
Last replied to by Helena Russell
Thanks a lot, all of you. It was very interesting and knowledgeable for me. I have tried Boric acid fine powder it gives better results.. Thank you so much again..
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Started by David Kano
I am curious on your options about XRF Fusion Machines/Instruments for XRF sample prep. Over the years I have seen many interesting arguments about gas vs. electric furnace fusion instruments and I am curious about the groups experiences with either...
Last replied to by Bob Mathias
A lot of interesting comments! As for selecting between Gas and Electric machines, one comment XRF Scientific are increasingly hearing from customers is the concern about the costs associated with spa...
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Started by Maya Rothman
I want to set-up a XRF analyser based Laboratory. Which XRF X-Ray is best suited for top quality laboratory analysis of Alloys. XRF is a new area for me, I have spent many years on ICPOES and ICPMS
Last replied to by Bob Mathias
For analysis of alloys (mostly high atomic no. elements) XRF of any configuration will be suitable unless you require to measure trace contaminants. If only particular category of alloys are to be tes...
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Started by Bill Fraser
Has anyone got access to a Horiba or Bruker micro-XRF spectrometer? Would it fit to measure geology samples with major contents of Nb, P, Fe, Ti, Mn, Si, Ta, Ba, Al, U and Ca?Also, How do they obtain chemical composition images and the requirements f...
Last replied to by David Kano
As stated above, there are many points to consider when measuring bulk minerals: I.E. Particle size, Mineralogical Matrix Effects, Analysis Volume, Sample Prep Methods, XRF software modeling and syste...
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Started by Alan Carter
We have to submit samples of bulk materials for rapid analysis and by convention here we use either semi-quantitative XRF or quantitative XRF, followed by ICP. We use PANalytical's Omnian for bulk analysis, major and trace-element. I'm told by one pe...
Last replied to by David
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