Gravity Separation & Concentration Methods

Gravity Separation & Concentration Methods 2017-04-04T06:57:23+00:00
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Started by Alex
We are currently setting up an Alluvial Gold Wash Plant - (Hopper bin - Vibrating Feeder - Trommel Scrubber - Sluice Box - Vibrating Screen (2mm) - Falcon Concentrator) We want to process the 75 tons per hour. The clay content is high. And the mat...
Last replied to by Tz Miner
Hello Alex - Did you get your clay problems solved? Hello Deano - Interested in your observations about a prewash for heavy clays? Do you provide tech services? Rob rslavik@tanzaniangoldfields.com...
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508
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Started by terrence
i am using spirals to recover chrome fines size (-1mm) to (+100microns) from ore. l have noticed a high grade and reasonable amount of values in the tailings and after size analysis a majority of these fines are in the range of (-75microns). How can ...
Last commented on by artem89
Hello Can you send me this information to my mail kurnev.ar@yandex.ru
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Started by GhanaBob
Dear Colleagues, We have just fire assayed our gold room concentrator tailings and it showed great losses, most likely due to a worn cone, low water back pressure and dirty water.  We have almost two years of tail dumps that now require reprocessi...
Last replied to by GhanaBob
https://www.dropbox.com/s/qirpogtn0dbmezn/2017-07-25%2009.01.50.jpg?dl=0 PICS OF OUR GOLD ROOM CONCENTRATOR TAILINGS.
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Started by GhanaBob
Hi All, I just received our sample tests back by SGS and I need some help in understanding the fire assay weights measured in Grams/Ton and backing that into  what we are measuring in our placer op of Grams/Cubic Meter. Can I just divide the Ton n...
Last commented on by GhanaBob
got it!
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81
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Started by GhanaBob
Is 1/8" thickness aluminum acceptable and sturdy enough  for my 1" x 5/8" riffles? Or should I use the  heavier steel gauge?  Thanks to all who can offer insights?
Last replied to by David
Hi Bod, i think an aluminium riffle @ 1/8" thick is enough to not blend or break. 
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55
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Started by Blackbird
We're looking for a small feeder system to move ore onto our shaker table. Have seen a small (maybe 2' long) auger before at the Candelaria mine that was used to add lime to a slurry. Can't seem to find a source for them. Any ideas?
Last replied to by David
Capacity? Tonnage? Shaker table size?
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323
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Started by Anupam
Can you explain recovery and recovery rates?  Say I am jigging mineral, I get a 60% recovery rate. feed specific gravity is 3.8, final product gravity is 4.2.  If I lower my recovery rate to 50%, what will happen? maintain final specific gravity, b...
Last replied to by Firon Woo
I agreed with Paul. And Anupam, why not increasing some more equipment to keep a larger quantity and the same quality?
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Started by Treve Mildren
What is the realistic feed capacity of a large shaking table ? I know the stated tonnages on the sales data sheets are rather exaggerated so does anyone have any real world numbers? What is the factor which decides that scale up? Logic would sugges...
Last replied to by Firon Woo
I know Chinese Shaking capacity ranges from 0.1-1.8mt/h of pulp. They never gave a solid capacity though.
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Started by fotros
hello to everyone.I'm reasearching for the best tool for generation of manganese. which methods of gravity separation is better for the mine that have 12-18 grade manganese ore & it' Pyrolosite(MnO2).And after this method we reach to what grade?Than...
Last replied to by Treve Mildren
Hi Fotros. I am far from an expert in this field but I am conducting Enhanced Gravity testwork on another mineral at the moment. The Mets are using the Mn as an indication of the upgrade . The Mn is...
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457
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Started by vekian
We have 2 discharge pipes from the cyclone underflow. 1 is a smaller diameter pipe going to gravity/scalping screens which then classify the product. Oversize from these screens report to mill discharge hopper. Undersize reports to gravity concentrat...
Last replied to by KRISHNADAS
We had a setup in one of our gold plants, where complete cyclone underflow goes to a 1 mm screen, the screen underflow goes to the concentrator, while screen overflow is pumped back to the ball mill. ...
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186
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Started by Ausmet71
I am looking into a project that has substantial waste stockpiles expected to have moderate concentrations of Nickel, Copper, Ag and Cobalt. They are mostly interested in the Nickel/Cobalt and more than likely not looking to make final metal/cathode...
Last replied to by KRISHNADAS
HI We had treated copper sulphide ores in DMS and was successfull. Could you send a particle size distribution of the ore , with metal concentrations in each size. This would enable us to predict th...
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Started by huntonia
The gangue is dolomite and ore is malachite, chrysocolla and heterogenite.  
Last replied to by KRISHNADAS
Hi I am working in a HMS plant recovering malachite. Chrysocolla is difficult to recover, but not impossible. Heterogenite cannot be recovered as it is fragile. We have operated a 350 tph plant and...
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Started by GhanaBob
Hello Colleagues, I want to thank each of you who added great clarity to my previous question of mass vs density measurements. In a similar vein, how can ppm be a meaningful metric compared to g/m3? What does ppm in placer sampling really tell us th...
Last commented on by max skinner
Except in the USA, but that is changing.
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Started by Rob.Earth.20
Hello, I want to ask about the design of ore washing plant. Did anyone have a reference about manganese or ore washing plant. Thank you.
Last commented on by Rob.Earth.20
Halo Bang, saya di NTT bang. We have manganese oxide. The minerals formed in ofiolite complex. The other mineral are limonite, some scaly clay and flint. Yes we did some gravity separation, but the ta...
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Started by Tererai
What do i have to consider when i want to optimize my scrubber? I'm have issues on tyres bursting and constantly changing gearboxes.  I know it has to do with the weight of the loaded scrubber but what else should i take into consideration in tryin...
Last commented on by Tererai
Thank you AJNeale so so much for the info. Will get back to you with pics
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208
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Started by Sam
This is an old school method I am trying to learn more about. Froth floatation on a shaker table. I don't mean done separately. Does anyone know anything about it? It was mentioned in a set of operating instructions for an RP-4 Shaker Table but not e...
Last replied to by Sam
https://www.google.com/patents/US2536286 Aggolmeration tabling.
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Started by NAVEEN VARMA B
Myself mineral processing engineer and am working on flow sheet development.... Am getting problem with maintaining circulating load in spiral concentrator circuit (rougher, scavenger & cleaner) followed by hydro cyclone? As we are giving hydro cyclo...
Last commented on by Tererai
hi Connayil how can i calculate the circulating load analytically
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248
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Started by ramoah
I have recently come across a small deposit of COLTAN in Africa. I am looking to start a small scale processing plant to produce a concentrate and then separate the tantalite from the Niobium. Can anybody  point me in the right direction. Where can ...
Last replied to by Treve Mildren
In Africa you will only be allowed to upgrade Coltan to a saleable grade using whatever method you choose but most common would be Gravity Concentration.   You would not be allowed to refine Tantal...
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Started by Michael Z. Papadopoulos
What is the minimum size of Chrome ore which is currently concentrated with Fine DMS?  
Last replied to by Michael Z. Papadopoulos
Size as in particle size please.
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239
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Started by biteyaboy
I have knelson concentrate that capture free gold and same concentrate is upgrade into shacking table sometimes ready for Acacia process (Leaching and Electrowinning). Recently i got little bit high copper value of copper. Resuts are 1000 ppm of Au a...
Last replied to by Tesaygo
Hello,  Base from my experience, after you've concentrate the gold even copper ore, try to leach it with water + sulfuric acid. For 8 hours. Sulfuric will dissolve copper. Best regards, tesaygo
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Started by GhanaBob
I frequently see Au grade of alluvial soil sample as both g/m3 and g/ton. I thought best practice is using g/m3 for alluvial. My questions: 1) why use g/ton? 2) how convert, say, .30g/m3 to g/ton? What is math? Thanks.
Last commented on by GhanaBob
Bingo! Exactly. Thx
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186
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Started by hadi
Dear All, Greetings from Iran and glad to be here among professionals. How to determine metal liberation size prior to jigging of Lead slag with 10% Pb content. Kindly advise if you have any idea.
Last replied to by Alex
I guess your method todetect the metallic particles is fine. Since you already detected a wide range of particle sizes (1 mm and powder) it is maybe not the best to talk about the liberation size, bec...
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Started by Tariq
I ran 6.11% copper oxide on a shaking table optimised to process chromite ore, and got 10.60% in heading, and 4.28 in middling. Copper was milled at 100 plus mesh. There was no control and hence no optimisation. How much say 1% copper ore can be upg...
Last commented on by Treve Mildren
Yes 50g is sufficient but send a little more (100g) in case I need to retest.
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Started by Sachin Prakash
Why were copper plates used historically for mercury amalgamation = rather than other metals?  it's always copper.  Thank you
Last replied to by Hauptsturm
Mercury is attracted to copper. The mercury is dispensed down a long copper table, which formed a thin coating of mercury on the whole table. This creates a mercury-wetted copper plate. The gold ore w...
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Started by Alex
We are looking for an efficient Nugget Trap design. Alluvial Gold Wash Plant - 75 tons per hour. Anyone has a proofed efficient design? We found some on internet, but not sure if they are really effective.
Last replied to by Deano
Looking vertically down at a piece of expanded metal sheet the diamond shapes are 3" long by 1.5" wide. The depth of the holes is controlled by the thickness of the metal sheet before treatment, depe...
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Started by explorer64
We sent a substantial amount of quartz gold ore to a mill for processing. After a couple hundred tests on the material an average grade was calculated. After milling for several days the mill says there is way less gold in the ore than what had bee...
Last replied to by David
Funny how Treve here posted photos of a Mozley Multi Gravity Separator to recover gold ... do you see the ball mill parallel?  
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Started by Mr. Nanda kishore
if jigging can process galena ore, which information is necessary e.g mineralogy, feed size, feed, jigging machine type etc. ?
Last replied to by David
Hello Mr. Nanda, unless this is a research project or you are under some serious environmental restrictions, you would not jig galena. Mr. Skinner is correct in saying flotation is the best galena re...
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Started by Latricia Patton
We always come across some customers who want to  concentrate the alluvial gold . And their alluvial gold is with some magnetic mineral,so some magnetic would stay with after gold centrifugal or jig separator . below is the flow offer by some suppl...
Last replied to by Khosana
Hi there, I would suggest that you perform mineralogy studies first before you could rule-out the use of magnet separation.  
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Started by Gabriel
I will buy a centrifugal gravity concentration. What is better: the Falcon or Knelson Concentrator?
Last replied to by Jorge Quintanilla
Many years ago I was involved in a technical comparission between Falcon and Knelson. In that particular case, the winner was Falcon , I don´t know, may be in other mines is different. I have a pers...
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Started by spaceexplorer
We are considering acquiring an iCON-i350 Centrifugal Concentrator ( http://www.iconcentrator.com ); a Falcon SB350 equivalent. However, we got an attractive offer of two units of “Oro Low-G 16” Horizontal Centrifuge Primary Concentrators” (use...
Last replied to by David
Yes, if you have no gold finer than 200 mesh (74um) you might be OK with that low-G machine. Otherwise.... you need high-G for better recovery of fine gold. Can you perform that type for test? Belo...
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Started by Olga
Hello colleagues! Does anybody has an experience with tube densifiers in a dense medium circuit? The picture of densifier is attached.  What are the advantages? Is it possible to set up usual thickening hydrocyclones? What are the differences? Wh...
Last commented on by Olga
Richardh, thank you very much for the reply!
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Started by Wattle01
Hi I'm currently working Placer gold a Quarts Conglomerate, I'm washing in a Trommel, 100 x 15 liter buckets ( soaked over night) in a day 5 days a month.... I have a limited amount of water. I'm wondering if I made a bigger Trommel to wash the 500...
Last replied to by dk
You may use the same existing  system  if required with lower rpm and necessary lifter bars for scrubbing and increase the retention time. The processed water may be taken to 2/3 compartment tanks f...
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Started by anjanisail
Dear All While preparing Flow Sheet for designing of a flow sheet for beneficiation of Hematite Iron Ore, I came across a Problem. I have considered Jig, Spiral Concentrator and WHIMS in my envisaged flow sheet. Based on the available test test resu...
Last replied to by Marshal Dienes
AS YOU MUST KNOW, One of the biggest mistakes in designing a process flowsheet is designing for an "average" ore that will never actually be seen. If Pilot Plant work is done, a range of ores should b...
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Started by Tarun Karakoti
We run a Gekko ILR to leach gravity gold. The problem we have is to estimate the Au recovered using Solution assays & tons from volume measurements. The variation is always approx. -30%. Where are we missing?
Last replied to by Tarun Karakoti
What are the best automatic sample cutters for the solution streams?I think the problem with solution accountability has been identified. It was due to interference with Fe ions with the use of AAS di...
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Started by Jean Rasczak
Could Gravity + Intensive Leach process the Gold in more cost effective manner? Some study in stopping the illegal miners using mercury claimed this opportunity too. Some junior miners samples of Indonesia, showing > 100 ppm Au in the GRG concent...
Last replied to by Hauptsturm
It is good to see you describe the research he has conducted concerning the use of glycine for leaching copper (1 paper) and for leaching gold and silver (2 papers). We look forward to their demonstra...

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