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9
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Started by
What is the most appropriate sampling technique for mine tailings (Pb-Zn) for the characterization and recovery?
What is the most appropriate sampling technique for mine tailings (Pb-Zn) for the characterization and recovery?
2
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15681
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Started by Collin Amonde
I am currently using Borax, Silica flour, Soda ash and Potassium nitrate, the sludge contains also copper, I need a guideline on flux calculation to use in order to move the copper or any other Base metal to the slag. I would like to know more a...
I am currently using Borax, Silica flour, Soda ash and Potassium nitrate, the sludge contains also copper, I need a guideline on flux calculation to use in order to move the copper or any other Base metal to the slag. I would like to know more a...
Last commented on by Dave Tahija
Thank you so much for posting this. It is most informative.We send a gravity concentrate offsite for high-intensity CN leaching and the offsite refiners sometimes have issues with high-iron pours as y...
Thank you so much for posting this. It is most informative.We send a gravity concentrate offsite for high-intensity CN leaching and the offsite refiners sometimes have issues with high-iron pours as y...
8
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1416
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Started by
I've read some comments in other debates on stockpile sampling, modelling and reconciling but here is my question:How do you manage very large, old, buried stockpiles (up to millions of tons, dumped years to decades ago, buried a couple meters down) ...
I've read some comments in other debates on stockpile sampling, modelling and reconciling but here is my question:How do you manage very large, old, buried stockpiles (up to millions of tons, dumped years to decades ago, buried a couple meters down) ...
Last replied to by Moneer_Noor
in Bauxite ore, we used excavator to made holes in systematic interval and collect samples in 0.5m depth interval. The stockpile has divide 2 bodies from top to down each 8 meters because the excavat...
in Bauxite ore, we used excavator to made holes in systematic interval and collect samples in 0.5m depth interval. The stockpile has divide 2 bodies from top to down each 8 meters because the excavat...
6
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1529
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Started by Standartenfurer
Hi. I'm interested in learning how to process the pyrite sulfide rich gold ores that are characteristic of the general area around Idaho Springs, Colorado. I'm a complete novice (currently I only run a sluicebox) and I understand that these are compl...
Hi. I'm interested in learning how to process the pyrite sulfide rich gold ores that are characteristic of the general area around Idaho Springs, Colorado. I'm a complete novice (currently I only run a sluicebox) and I understand that these are compl...
8
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1483
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Started by Trinadha rao
Hi & dear all, We have one million ton of iron ore tailing material contains 48-49%Fe and having size of around 80% of 10 microns material. we have carried out number of experiments on flotation and HGMS , as its having very fineness we failed to ...
Hi & dear all, We have one million ton of iron ore tailing material contains 48-49%Fe and having size of around 80% of 10 microns material. we have carried out number of experiments on flotation and HGMS , as its having very fineness we failed to ...
1
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1039
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Started by FullerBack
Hello Everyone. I would like help in ways of reducing contained slag in ferrochrome fines produced by spiral washing of smelter slag. The method of calculation of of contained slag seems to negate any of the effects of washing as it tests Al in the m...
Hello Everyone. I would like help in ways of reducing contained slag in ferrochrome fines produced by spiral washing of smelter slag. The method of calculation of of contained slag seems to negate any of the effects of washing as it tests Al in the m...
Last replied to by Bob Mathias
Beneficiation of raw materials and utilisation of fines and slags maybe...
Beneficiation of raw materials and utilisation of fines and slags maybe...
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1246
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Started by Basel A-Shaban
Greetings: I would appreciate your help in identifying a processing and a purifying replacement substance to Mercury in gold mining. I am interested in presenting a less pollutant substance to Mercury that can be obtained in commercial quantities fo...
Greetings: I would appreciate your help in identifying a processing and a purifying replacement substance to Mercury in gold mining. I am interested in presenting a less pollutant substance to Mercury that can be obtained in commercial quantities fo...
Last replied to by MinEx Associates
There is no substitute as such - if borax was a real option, everyone would be using it. If for final recovery and cleaning, mercury is fine. It can be controlled. The issues with mercury are wi...
There is no substitute as such - if borax was a real option, everyone would be using it. If for final recovery and cleaning, mercury is fine. It can be controlled. The issues with mercury are wi...
2
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3180
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Started by anjanisail
I want to know how Metallurgical Process Plant audit of an Iron Ore crushing and beneficiation Plant will be carried out. What are the process variables we need to study during audit of the plant. How many no. of samples I need to take at a samp...
I want to know how Metallurgical Process Plant audit of an Iron Ore crushing and beneficiation Plant will be carried out. What are the process variables we need to study during audit of the plant. How many no. of samples I need to take at a samp...
Last replied to by David
Watch https://www.911metallurgist.com/blog/how-to-evaluate-mineral-processing-plant-performance
Watch https://www.911metallurgist.com/blog/how-to-evaluate-mineral-processing-plant-performance
1
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1543
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Started by gallala
What the adopted method used for lithium extraction from brine deposit?
What the adopted method used for lithium extraction from brine deposit?
Last replied to by David
Hello Mr. Gallala, and welcome back. A method for precipitating lithium from the brines was provided by one of the contract studies. The method employed addition of-aqueous AlCl3 and pH adjustmen...
Hello Mr. Gallala, and welcome back. A method for precipitating lithium from the brines was provided by one of the contract studies. The method employed addition of-aqueous AlCl3 and pH adjustmen...
1
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1468
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Started by janakiram
Which Mathematical Modeling Module will be helpful in Metallurgy and materials science. please Suggest any online courses available. I am interested in leaning it.
Which Mathematical Modeling Module will be helpful in Metallurgy and materials science. please Suggest any online courses available. I am interested in leaning it.
Last replied to by Paul Morrow
Hi and welcome. See: http://www.amazon.com/Expert-Systems-Mineral-Metal-Processing/dp/0080417043http://www.amazon.com/Modern-Control-Design-MATLAB-SIMULINK/dp/0471496790http://www.amazon.com/Masterin...
Hi and welcome. See: http://www.amazon.com/Expert-Systems-Mineral-Metal-Processing/dp/0080417043http://www.amazon.com/Modern-Control-Design-MATLAB-SIMULINK/dp/0471496790http://www.amazon.com/Masterin...
2
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1368
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Started by Bhaduri
What is the optimal pH & temp to precipitate molybdic acid (MoO3.H2O) from an ammoniacal molybdate solution (assume 100's ppm elemental contaminants's such as soluble V & Ni & significant ammonium sulfate...100-gpL+) using conc H2SO4 or HNO3? The pre...
What is the optimal pH & temp to precipitate molybdic acid (MoO3.H2O) from an ammoniacal molybdate solution (assume 100's ppm elemental contaminants's such as soluble V & Ni & significant ammonium sulfate...100-gpL+) using conc H2SO4 or HNO3? The pre...
5
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3212
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Started by Bobson
Hi All, Does anyone have experience with representatively sampling dry/moist concentrate? After filtering, the concentrate is transported via conveyor belt (As usual). There are several places to install a cross belt sampler, however, I have...
Hi All, Does anyone have experience with representatively sampling dry/moist concentrate? After filtering, the concentrate is transported via conveyor belt (As usual). There are several places to install a cross belt sampler, however, I have...
Last replied to by David
In comparison, this is a general arrangement drawing for a $300,000 head pulley sample cutter construction. Also refer to https://www.911metallurgist.com/blog/types-models-sample-cutters
In comparison, this is a general arrangement drawing for a $300,000 head pulley sample cutter construction. Also refer to https://www.911metallurgist.com/blog/types-models-sample-cutters
2
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1639
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Started by Tererai
What are the metallurgical process control test works that can be done in a gold processing plant, in trying to improve efficiency and reduce production cost? Starting from when ROM enters the plant till its at slimes dam
What are the metallurgical process control test works that can be done in a gold processing plant, in trying to improve efficiency and reduce production cost? Starting from when ROM enters the plant till its at slimes dam
Last replied to by Craig Lockhart
Hello Tery, I agree with Dizzy in that much more information is required to deliver a meaningful answer. Besides the process itself, the level of instrumentation in the plant (levels, temperature...
Hello Tery, I agree with Dizzy in that much more information is required to deliver a meaningful answer. Besides the process itself, the level of instrumentation in the plant (levels, temperature...
1
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1568
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Started by emanus
in pH maintenance/controlling, why lime is most preferable in VAT leaching than caustic soda?
in pH maintenance/controlling, why lime is most preferable in VAT leaching than caustic soda?
Last replied to by David
Hi, Lime is cheaper more readily available than Caustic Soda. As a pH Regulator Agent: In the lab, the addition of lime makes easier to control the pH. Sodium Hydroxide is a powerful caustic age...
Hi, Lime is cheaper more readily available than Caustic Soda. As a pH Regulator Agent: In the lab, the addition of lime makes easier to control the pH. Sodium Hydroxide is a powerful caustic age...
5
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1630
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Started by Raje Singh
What are some of the routine and regular technical/Metallurgical checks as a metallurgist you have to look at on the plant so as to optimise the recovery and throughput of the plant? And to help avoid unnecessary downtimes! Also latest technologies a...
What are some of the routine and regular technical/Metallurgical checks as a metallurgist you have to look at on the plant so as to optimise the recovery and throughput of the plant? And to help avoid unnecessary downtimes! Also latest technologies a...
8
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1948
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Started by Amar
I would like to know more about tin processing. Which processes are used for upgrading the cassiterite ore? Is flotation the most common method used for treating cassiterite?
I would like to know more about tin processing. Which processes are used for upgrading the cassiterite ore? Is flotation the most common method used for treating cassiterite?
Last replied to by
Part 1 : All mineral separations, flowsheet developments and equipment selection are based on a good understanding of the mineralogy of the ore types you propose to treat. Gravity is a good selection ...
Part 1 : All mineral separations, flowsheet developments and equipment selection are based on a good understanding of the mineralogy of the ore types you propose to treat. Gravity is a good selection ...
2
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957
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Started by Tarun Karakoti
I am faced with a challenge of finding an appropriate sampling system that would work in a launder. There is limited space between the equipments that are connected by the launder. It has to be across.
I am faced with a challenge of finding an appropriate sampling system that would work in a launder. There is limited space between the equipments that are connected by the launder. It has to be across.
Last replied to by Obersturmbann
If the sample is for metal accounting, consider dropping the flow into a sump and pumping back to the second vessel and using a proper cross-stream sampler. If it is a process control sample, you can ...
If the sample is for metal accounting, consider dropping the flow into a sump and pumping back to the second vessel and using a proper cross-stream sampler. If it is a process control sample, you can ...
12
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4879
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Started by Bob Mathias
I've seen a few cases in the last few years where AAS samples and assays are understating the gold content in sulphide related mineralisation. Clearly some of the problem is related to the incomplete extraction of the gold by digestion but I'm wonder...
I've seen a few cases in the last few years where AAS samples and assays are understating the gold content in sulphide related mineralisation. Clearly some of the problem is related to the incomplete extraction of the gold by digestion but I'm wonder...
Last replied to by
Normally the gold in sulphides is associated to the number of gold particles in the selected portion for analysis, the probability to have a representative number of particles on a portion of sample l...
Normally the gold in sulphides is associated to the number of gold particles in the selected portion for analysis, the probability to have a representative number of particles on a portion of sample l...
10
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2376
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Started by
I'm looking for some opinions and experiences as to the most reliable methods of determining sulphide-sulphur (in pyrite, arsenopyrite and so as opposed to sulphate sulphur) and carbon in carbonate versus organic carbon in rock materials. What sampli...
I'm looking for some opinions and experiences as to the most reliable methods of determining sulphide-sulphur (in pyrite, arsenopyrite and so as opposed to sulphate sulphur) and carbon in carbonate versus organic carbon in rock materials. What sampli...
Last replied to by Marshal Meru
By reading the various comments I didn't read a mention to the theory and practice of sampling by Pierre GY.Least of you certainly have heard or read some sampling documents.Nets about what Pierre GY ...
By reading the various comments I didn't read a mention to the theory and practice of sampling by Pierre GY.Least of you certainly have heard or read some sampling documents.Nets about what Pierre GY ...
11
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2121
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Started by Victor Bergman
I am trying to determine the cause of errors in analysis of iron ore standards where the analytical technique involves lithium borate fusion followed by ICP-AES. Manufacturers of the standards specified they must be oven dried prior to fusion to avoi...
I am trying to determine the cause of errors in analysis of iron ore standards where the analytical technique involves lithium borate fusion followed by ICP-AES. Manufacturers of the standards specified they must be oven dried prior to fusion to avoi...
Last replied to by
The ASTM moisture method that specifies appropriate drying temperature is ASTM D2216-10. Perhaps ASTM has details supporting their specified temperature within their development history. I am not awar...
The ASTM moisture method that specifies appropriate drying temperature is ASTM D2216-10. Perhaps ASTM has details supporting their specified temperature within their development history. I am not awar...
19
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3384
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Started by Raje Singh
Would you recommend sending samples from the same prospect to two different laboratories for the same analysis because of time constrain? Any QC implication!
Would you recommend sending samples from the same prospect to two different laboratories for the same analysis because of time constrain? Any QC implication!
Last replied to by Sudhirkumar
Before sending samples to two separate labs, you will want to have done QA/QC checks on them. Both will have slightly different results due to their own errors. In the past, we have done round robin c...
Before sending samples to two separate labs, you will want to have done QA/QC checks on them. Both will have slightly different results due to their own errors. In the past, we have done round robin c...
6
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2141
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Started by
Anyone have experience at removing flake mica from small scale (10-20tph ROM), after scrubber, before jig. I once saw a (South African) machine to do this, called a 'reverse spiral classifier'. A drum, 1.5 or 2m in diameter, 3-4m in length, with a fl...
Anyone have experience at removing flake mica from small scale (10-20tph ROM), after scrubber, before jig. I once saw a (South African) machine to do this, called a 'reverse spiral classifier'. A drum, 1.5 or 2m in diameter, 3-4m in length, with a fl...
Last replied to by Helena Russell
I agree with you, up-current classification is likely to produce the most consistent results. Get in contact with Nagrom in Western Australia as they have done a lot of work removing mica from spodume...
I agree with you, up-current classification is likely to produce the most consistent results. Get in contact with Nagrom in Western Australia as they have done a lot of work removing mica from spodume...
7
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3317
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Started by
Does anyone have specific experience with a successful method of sampling a pile of material for contained metal which may cover from a few hundred to several hundred square meters in plan range and depth from 3 to 30 m? I have been through this exer...
Does anyone have specific experience with a successful method of sampling a pile of material for contained metal which may cover from a few hundred to several hundred square meters in plan range and depth from 3 to 30 m? I have been through this exer...
Last replied to by Paul Morrow
Whatever you do short of reprocessing and using correct belt or slurry samplers will have inaccuracies. Take the company accountant with you when you try to sample the pile and convince them of the ne...
Whatever you do short of reprocessing and using correct belt or slurry samplers will have inaccuracies. Take the company accountant with you when you try to sample the pile and convince them of the ne...
8
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1417
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Started by Unterstarm
Given that the sampling variability is likely to be up to 2 orders of magnitude greater than any analytical error then do we need spend 2 orders of magnitude more on sampling devices in the plant than on the analytical tools (e.g. ICP-MS) that we’r...
Given that the sampling variability is likely to be up to 2 orders of magnitude greater than any analytical error then do we need spend 2 orders of magnitude more on sampling devices in the plant than on the analytical tools (e.g. ICP-MS) that we’r...
Last replied to by Helena Russell
One issue in this context is to make a cost study, where you compare the costs for a sampling system versus the cost for the "human sampling" when taking in account the possible production losses and ...
One issue in this context is to make a cost study, where you compare the costs for a sampling system versus the cost for the "human sampling" when taking in account the possible production losses and ...
8
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1573
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Started by Tarun Karakoti
Stream sediment samples of 0.5g analysed for gold using ME-MS41L ICPMS seem dismal w.r.t. previous results for the same area. Thinking of reanalysing! Any advice on sample size or analytical technique
Stream sediment samples of 0.5g analysed for gold using ME-MS41L ICPMS seem dismal w.r.t. previous results for the same area. Thinking of reanalysing! Any advice on sample size or analytical technique
Last replied to by
Apologies for my large contribution, but was thinking about some old sediment data recently.In exploration, IMO, too much is often read into absolute values returned from stream sediment samples. Ther...
Apologies for my large contribution, but was thinking about some old sediment data recently.In exploration, IMO, too much is often read into absolute values returned from stream sediment samples. Ther...
10
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1373
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Started by Subhash-Kumar-Roy
Is there a standard practice or procedure for collection of sample of Nickel ore for ore grading purpose?
Is there a standard practice or procedure for collection of sample of Nickel ore for ore grading purpose?
Last replied to by Subhash-Kumar-Roy
Thanks for the clearance & assurance.
Thanks for the clearance & assurance.
10
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2071
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Started by
Does anyone know of a commercially available source of certified reference materials (standards) for REE in the range of 100 - 50,000 ppm total REE?Ideally including elevated Cu, Au, Mo& U. The REE occur as carbonates and phosphates in an IOCG matrix...
Does anyone know of a commercially available source of certified reference materials (standards) for REE in the range of 100 - 50,000 ppm total REE?Ideally including elevated Cu, Au, Mo& U. The REE occur as carbonates and phosphates in an IOCG matrix...
Last replied to by
Thanks for all the replies, there is no need to comment further as I have found what I need.
Thanks for all the replies, there is no need to comment further as I have found what I need.
24
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4038
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Started by Unterstarm
What is best practice when splitting a -80mesh fraction of stream sediment collected for gold analysis? Small riffle splitter, rotary splitting device (RSD) or other?The -80mesh fractions weigh up to several hundred grams and need splitting for a 50g...
What is best practice when splitting a -80mesh fraction of stream sediment collected for gold analysis? Small riffle splitter, rotary splitting device (RSD) or other?The -80mesh fractions weigh up to several hundred grams and need splitting for a 50g...
Last replied to by
Thank you for your kind comments. To answer your question in relation to figures, I suspect the reason for his 'better' rsd's was simply that he was working with a model two-component system (that als...
Thank you for your kind comments. To answer your question in relation to figures, I suspect the reason for his 'better' rsd's was simply that he was working with a model two-component system (that als...
7
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1137
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Started by Tarun Karakoti
Please I want to know the methods that were being used manually to determine the quantity of gold in solution before the invention of the AAS machine.
Please I want to know the methods that were being used manually to determine the quantity of gold in solution before the invention of the AAS machine.
Last replied to by Bob Mathias
You can make a dish out of assay lead foil evaporate a weighed amount of solution in it then cupel the foil. The resulting gold bead can then be weighed. All these methods require good lab technique t...
You can make a dish out of assay lead foil evaporate a weighed amount of solution in it then cupel the foil. The resulting gold bead can then be weighed. All these methods require good lab technique t...
6
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2415
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Started by Bob Mathias
The process uses a lot of lime to control pH because of POX and sulfide bearing gold minerals. We have problems that the pH measurement isn´t accurate and sensors are replaced often. I think the lime is sticking on the sensor, thus, the measurement ...
The process uses a lot of lime to control pH because of POX and sulfide bearing gold minerals. We have problems that the pH measurement isn´t accurate and sensors are replaced often. I think the lime is sticking on the sensor, thus, the measurement ...
Last replied to by
You can find this system in Mettler Toledo. It has an automatic wash probe system with acid solution. If you do not clean your pH probe every shift, it can be scale and not measured.
You can find this system in Mettler Toledo. It has an automatic wash probe system with acid solution. If you do not clean your pH probe every shift, it can be scale and not measured.
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3239
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Started by Unterstarm
Anyone knows another way to do the fire assay for the determination of Au and Ag, replacement on the use of lead oxide. Another element that can be used to prevent lead contamination!
Anyone knows another way to do the fire assay for the determination of Au and Ag, replacement on the use of lead oxide. Another element that can be used to prevent lead contamination!
Last replied to by Kumar Choudhry
Agree with all the above. One more thing is to ensure that you do not use the weighing materials on any other tests to avoid contaminating the flux. And thus translating into GLP and housekeeping.
Agree with all the above. One more thing is to ensure that you do not use the weighing materials on any other tests to avoid contaminating the flux. And thus translating into GLP and housekeeping.
4
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975
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Started by Marshal Meru
Would it be beneficial to be able to analyze the elemental grades of material in real time on the conveyor belt of an operational process?
Would it be beneficial to be able to analyze the elemental grades of material in real time on the conveyor belt of an operational process?
Last replied to by Marshal Meru
We do have analysers in coal applications that are used for contracted payments (tariff terms). The issue when comparing analyser performance to lab performance in any commodity is that the sample mas...
We do have analysers in coal applications that are used for contracted payments (tariff terms). The issue when comparing analyser performance to lab performance in any commodity is that the sample mas...
4
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3889
VIEWS
Started by Paul Morrow
I've been looking into several different deposits where sequential copper analysis are carried out to estimate the amount of the total copper in phases such oxides, secondary sulphides, silicates and even one case minerals soluble by water. However, ...
I've been looking into several different deposits where sequential copper analysis are carried out to estimate the amount of the total copper in phases such oxides, secondary sulphides, silicates and even one case minerals soluble by water. However, ...
Last replied to by
The analyses are used like prediction with the goal measure the potential of copper recovered in the process directly without adjustment or scaling, and then in general it assumes that CuS/CuT ratio w...
The analyses are used like prediction with the goal measure the potential of copper recovered in the process directly without adjustment or scaling, and then in general it assumes that CuS/CuT ratio w...
4
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3092
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Started by
I have recently been looking at screen fire assays of core samples containing coarse gold. This seems to be a very difficult process for a project to quality control in terms of duplicates due to the in-homogeneity of the coarse fraction - finer frac...
I have recently been looking at screen fire assays of core samples containing coarse gold. This seems to be a very difficult process for a project to quality control in terms of duplicates due to the in-homogeneity of the coarse fraction - finer frac...
Last replied to by Bob Mathias
The best way is to do a combination of screen metallic’s, size-by-size assays, and triplicate analyses of properly sampled coarse fractions. This is a more practical approach and can be augmented by...
The best way is to do a combination of screen metallic’s, size-by-size assays, and triplicate analyses of properly sampled coarse fractions. This is a more practical approach and can be augmented by...
4
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1078
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Started by Amar
Does someone help me regarding what are the QA/QC practices being followed for analysis of Coal?
Does someone help me regarding what are the QA/QC practices being followed for analysis of Coal?
Last replied to by
Unfortunately you can only access them if you purchase them or have a subscription. You can purchase individual standards or larger access. They have a good search engine that allows you to preview so...
Unfortunately you can only access them if you purchase them or have a subscription. You can purchase individual standards or larger access. They have a good search engine that allows you to preview so...
Sonic drill is the most suitable one. But if it’s moisture is less than 15 you need water addition for cooling after 5meter. Be careful about this water addition effects. it can be 1m3 for 10mete...