Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering 2017-04-04T06:57:51+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Mineral Processing or Laboratory Work.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

comparison between thiosulphate and direct cyanidation (4 replies and 3 comments)

10 months ago
kahonde 10 months ago

hie i am a student metallurgist at Mrasta mining pvt ltd in Zimbabwe.recently we have been facing challenges in trying to vat leach sulphide-gold ore.i proposed to change the lixiviant,better yet do a comparison between cyanide and ammonical-thiosulphate.i want to hear your views on thiosulphate leaching,thank you.

stephen barrington
10 months ago
stephen barrington 10 months ago
1 like by kahonde

Good day i am also in Zimbabwe and looking to get involved in cyanide gold leaching. Please contact me as I would like to learn want to do and how to do it.

I am really new to all this many thanks.

10 months ago
max skinner
10 months ago
max skinner 10 months ago

One good way is a process I have been working with, nano grinding in an attritor, or something like an Isa mill. You do this in a solution of sodium or ammonium thiosulfate, I have been getting recoveries in the high 90's, you can google this process. Likely cyanide would also work as in my case this is more of a liberation grind thing. I have gone to the thiosulfate because I am in California and cyanide is very difficult to permit here. 

10 months ago

Max, are your ores high in sulfide?

10 months ago

yes they are

10 months ago
David 10 months ago
10 months ago
Bhaduri 10 months ago
2 likes by Charlie and kahonde

Kahonde, Ammoniacal thiosulfate w/Cu+2 as a catalyst is good for leaching Au from carbonaceous ores; unlike cyanide where the dissolved AuCN complex will be "preg-robbed" by the organic carbon (humates); if the Au is encapsulated in refractory sulfides such as pyrite, orpiment, realgar & the like, a pre-treatment step such as roasting is necessary for liberation; if Au is present in the grain boundaries of a sulfide mineral such as marcasite (same composition as pyrite but structurally different), it may be possible to liberate the metal for cyanidation or thiosulfate leaching by a soda ash/caustic leach @60C...there are reams of publications in your local library, SME (Society of Mining Engrs, & galore freebie publications on the web...all you need is the inclination to spend time doing some research.

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.


We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.