Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction2017-04-04T06:57:36-04:00
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Started by Jackson
Hello!! hope everyone is OK!!! well, going straight to my question;i was doing bottle rolling so as to establish some of the factors that will be optimum to the newly planned to process low grade sulfide gold ore gold processing plant. While doing t...
Last commented on by Joeram
Hello, maybe you can advise me. I am grinding fine using sod. cyan. Since I don't have a vat, I am using 5 gallon buckets, mixed and forced air. I started with 200 gram cyan. for 20 lbs ground fine or...
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Started by Guelb22
We have high grade deposit and traditional mining. W e have leached gold into cyanide solution but due to cost of electrowinning cell and power unavailibility in the desert we get stuck, any idea how to recover that gold from the solution without ele...
Last replied to by Joeram
Guelb22, Did you ever get it figured out. I am in a the similar situation. I a going with cyanide but dont understand how. I have arsenic and sulfide with fine gold. The arsenic and sulfur has really ...
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Started by oro
I am learning / testing a torch assay method for ores and leaches developed a couple decades ago by Charles Butler.  He developed the system for small - medium scale hard rock miners so they can perform initial tests on ores in the field and leaches...
Last commented on by Joeram
Hello Todd, I am getting ready to use cyanide and it keeps coming up de-aerate solution. I have never done this or any mining. Assay yes gold arsenic and sulfur. If I boil solution first then add SMB ...
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348
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Started by Alex Loutou
Dear Collega, How to manage Mercury in pregnant solution (0.02 ppm) which is became 400-500ppm in the filtered cake.It is problem with environtent. any suggestion will highly apreciated regards, Alex L
Last replied to by oro
We have a similar issue with high levels of Hg - but in the head feed (tailings) and need an effective method to remove the Hg as part of a cyanide process.  Head feed process is 10-15 tons x day.  
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Started by Hamid72
Hello everybody Is there a good book to leaching & electrowining design for copper, zinc, gold? Thankyou
Last replied to by David
a nice place to share with everyone https://mega.nz/
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Started by John Urban
I made a mistake, and started off using nitric acid that was too concentrated. When I refine scrap jewellery from a customer, I calculate how much gold there is, and then melt in enough copper to bring it down to 4 kt. I pour the melt into a bucket o...
Last commented on by John Urban
Thanks, Dave. I think your answer is the most likely.
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Started by sirjohnnyhuman
We are a small company operating in Brazil mining quartz hosted gold from a Greenstone Belt.  I have recently started with the company, although I have been a long term follower and investor and I'm looking at all areas to try to understand the dif...
Last replied to by romagold
I don't have a huge amount to add to this discussion but ALSGlobal has labs in Brazil. They did my ore sample testing and I would highly recommend them.  They can be contacted at alsglobal.com 
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Started by Teggry
Hi, I have touched on the subject before and am still looking for a cheap, inexpensive way to extract gold from old and undersized loaded carbon. Question- is it possible to heap leach carbon? I.E. Stack carbon on a pad and leach the gold out of it...
Last replied to by TonyE
Robs idea is the better option. However, I believe an intense cyanide leach with about 5% NaCN and 2% NaOH with vigorous agitation followed by filtration and a few rinses with soft water will achieve ...
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Started by pamela
Hi, I am having difficulties figuring out how to separate fine loaded carbon from sands. What best mechanism can i employ?
Last replied to by mpelera
use shaking table since sg of sand is higher than that of carbon
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Started by jovanifirebird
hello guys. we have gravity gold fed to the plant for the past 9 months. do we expect for some of the gold to go down the bottom of the leach tanks before cyanidation occurs. because we did a weekly GIC, but we still got gold losses. but from the lab...
Last commented on by James Wise
Check all processing launders/pipes or any access where a fine ribbed cloth or mat etc can be laid to highly concentrate fine gold in no time flat.
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Started by Ethan
Hello friends, can someone help me with how to precipitate gold thio-cyanate ?as well as from which materials are resins made of?
Last replied to by SmartDog
Thiocyanate leaching has not turned out very promising, perhaps you are thinking of thioures leaching. For some general discussion of thiocyanate see:https://www.911metallurgist.com/hydrometallurgy/t...
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Started by Japan Man
Hello Everyone, We are a small mining operation working out of Japan tying to maximize gold recovery with copper rich ore using cyanidation. In a previous cycle of cyanidation we ran with 800tons of dust (gold tailings) we recovered 1.3kilos of gol...
Last replied to by Jorge Quintanilla
Hello everyone:I had that problem years ago and I solved it in several ways at the same time.I had the CIP CIP CIC system, with modified ZADRA. The real problem was the copper build up in tailings dam...
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Started by Charlie
Hello everyone, in any gold or silver leach plants: Did you add lead nitrate, and if so, where was it added (in ball mill, separate tank etc), how much (g/t), and what was the conditioning residence time? Did you ever add peroxide, where was it a...
Last commented on by MINURO
what quantities of hydrogen peroxide are recommended per tonne
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Started by Teggry
Hi, Due to costs and transport, stripping of undersized carbon is not feasible where I am. It gets buried. Would it be possible to place the carbon into an Acacia Reactor and strip the gold from it that way? (would that be similar to leaching gold f...
Last replied to by TonyE
What is your gold loading on your fines? What mass do you produce per month? An answer to these questions will determine the kind of effort required, if any.
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Started by Alex Spynu
Hello! Does anybody know how distribute a loss of carbon in CIP(CIL) process?What part of carbon of total break does degradate in the leaching, transportation, screening, elution, thermal regeneration?
Last replied to by dassahd
20-39g/t. You may optimise your system to reduce from the 39g/t.
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Started by amressam
Hello I'm work in a mining company and use cyanide in the extraction process, I want an easy way to get rid of the cyanide resulting in tailing. Thank you
Last replied to by David
Hi https://www.911metallurgist.com/profile/ECD40/ sent this to me to give you. INCO Treatment of Tailings Pulps or SlurriesThe precious metals mining industry’s use of cyanide to extract precious ...
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Started by Jeffreybch
Hi, My name is Jeffrey, I manage a little benefitiation plant in Costa Rica.  We concentrate artisanal tailings (gravity-flotation,which works well) and later we remove the gold (problem).  We produce gravity concentrates in the order of 150-500 g...
Last replied to by CA
Jeffrey, I am in Central America and have been working on artisinal tails for a few years now.  You need to determine if the gold is going into solution via atomic absorption.  If you don't have th...
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Started by epiphane
GOOD EVENING TO YOU; I WOULD LIKE TO KNOW IF THERE IS A FORMULA THAT ALLOWS CALCULATING THE CARBON TRANSFER TIME. HERE ARE DIFFERENT PARAMETERS:SETPOINT 21G / LTRANSFER PUMP FLOW: 60L / SVOLUME OF THE TANK: 4000M3.  
Last commented on by epiphane
Thank you, I have no idea about the flow of carbon, how to determine that? I would like to know the procedure to have the 1260gram per liter, can I have the formula please
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Started by oro
In a heap leach application of milled tailings collected from various small mining sites there is always a certain amount of debris (plant material, wood and leaves and plastic, sometimes a bit of grease / oil).  I understand the carbonaceous mater...
Last replied to by oro
Thank you Dave, the tailings are produced by small scale artisanal miners using rustic stone mills who discharge daily into pits.  Over a period of months the wind and rain cause debris to collect in...
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Started by epiphane
Hello sir; I need your help. I would like to know what are the different factors that can cause a bad transfer of carbon in the CIL circuit. thank you!!!!!
Last replied to by David
Until somebody smart comes along, please read: https://www.911metallurgist.com/blog/gold-circuit-carbon-sampling-inventory-movement https://www.911metallurgist.com/hydrometallurgy/carbon-movement-st...
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Started by Mpiga
I am currently operating a vat leaching with ore containing higher content of sulfur about 4%. Every time pH is dropping. I need help to solve this so as to get good recovery  
Last replied to by David
Hi, You can keep your pH up with lime or Sodium hydroxide (NaOH)
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377
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Started by Kimmayong
How many days is the maximum that cyanide is effective in gold leaching?
Last replied to by Cyanide
Again, it depends... The half-life of hydrogen cyanide in the atmosphere is about 1-5 years. https://www.atsdr.cdc.gov/toxguides/toxguide-8.pdf
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Started by Collin Amonde
Good day  All Could anyone help me to understand why leach tanks agitators break/snap off at the flanges where the agitator is bolt on. In some cases the bolts broke off or the agitator snap at the part of the flange of the agitator.
Last commented on by Collin Amonde
Jorge, thank you very much. We will definitely look into the above points
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386
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Started by nagokumbirai@yahoo.co.uk
Am running a CIP plant regrinding a dump from stamp mills. Ores that make up the dump are from various areas, challenge is continuous settling of my leach tanks. How can I solve the problem of tank situation?  
Last replied to by Todd H
Your top size that is the most likely issue. 70% passing 75um should be fine enough but it does not tell the story about the top fraction.  Do you have a screen analysis? It is possible that you tan...
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Started by Munyabrwn
Hie Engineers,My name is Munga, I have a question based on what i am experiencing on the ground. I have gold ore with high copper content.My question is how can i suppress the copper during leaching so as to reduce my cyanide consumption? I hope to...
Last replied to by tseal
It is best to determine the Cu minerals. Cu minerals that are CN soluble.
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388
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Started by Makopa29
How are you colleagues.I have just commisioned and set up a new gold plant combining CIP and CIL for gold recovery.i want to implement a system/s that must be implemented and followed to achieve best practices and results.What suggestions or advice c...
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Started by Mpiga
hello friends,can some one help me a formula to calculate the capacity( in tons) of the round VAT leaching tank,also what are the indicators to show that the carbon is full,that need to be replaced? Thanks in advance.
Last replied to by Alex Spynu
For CIP and CIL tanks you can take operating volume about 90-95% of overall volume.  Nobody determine is it full carbon or not by any indicators. There are precise time and volume when you should tr...
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Started by epiphane
Hello to you; I'm working on optimizing the carbon concentration in CIL tanks, my question is: HOW CAN SAMPLING IN CIL TANKS, AND DETERMINE CONCENTRATION?
Last replied to by Alex Spynu
There is "dip test" for determining how much carbon you have in tank. Method is how describe above by Todd H.
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325
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Started by antz001
I would like to determine and/or calculate accurate the outflows for a gold heap leach?
Last replied to by Todd H
Question: are you trying to determine how much liquid is flowing out of a heap leach in an actual ditch or are you trying to model the flows of a heap leach with a solution balance? For a solution ba...
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315
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Started by Filip_D
Hello, I am doing research on hydrometallurgical metal recovery (as well as more conventional metal recycling) within the industry and I hit a wall. I am able to identify technologies employed, as well as the amount of processed materials in both ar...
Last commented on by Filip_D
Thank you, however this is a bit too specific. What I am looking for are information on an industry-scale level. How much waste is generated and what type, during a plant's annual operations for examp...
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Started by tgraham@minsep.com.au
Hi I am looking for advice on creating a good flowsheet for a gold tailings recovery plant. I am particularly interested in the best technology for splitting particle size fractions i.e. using fine wet screens vs cyclones, attrition cells. Thanks f...
Last commented on by Gold Fox
The topic looks interesting, please keep me posted on this, thanks
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Started by Stephan47
Hi everyone!I need any information on dealing with a problem of high oxygen comsumption in heap leaching operation due to the presens of oxygen-consuming minerals. Could you please provide me some practical examples or references where I can find cl...
Last replied to by Todd H
A couple of questions - how do you know the oxygen is low? What irrigation system are you using? You can measure the dissolved oxygen of the barren solution applied to the heap and the pregnant solu...
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Started by Hans_512
Hello folks, I work in a ADR plant (heap leaching) over the years we have stock fine particles of activated carbon, actually in disuse. We will like to know what technologies can be applied in order to recover the residual gold in carbon, the gold ...
Last replied to by saguero
Hi Hans...have you tried to gasify the carbon and then do a smelting to ashes?...we are doing something similar in Indonesia for artisanal miners. How much fine carbon do you have?....if interested y...
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Started by hasliclimber
Hello everybody. I’m working in the probably smallest zinc facility of the world… We do Zn recycling from fly ash of an incineration plant, means 100% secondary input. The process is like this: leaching of fly ash with HCL > Cementation with Z...
Last commented on by hasliclimber
Hi Justin. Thanks for your quick answer! 1) No. The NaOH is added in the mixer directly. I will have a look on this idea! 2) Yes. Iron content is around 2 mg/L by entering the SX. 3) Yes we do. Moreo...
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Started by jovanifirebird
hi guys.  i work in a gold processing plant. we are facing with some issues. carbon started to go down while density was high( 46%). at the top, carbon is very less, while at the bottom, its high. in my point of view carbon can only go down when den...
Last commented on by jovanifirebird
Hi Rahil. Thanks for the reply. Definitely agree with you. The tanks are homoginized well. Density at the top and down the tanks are same. 46-47%. Yet most of the carbon is still down. Carbon is not ...

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