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Ore coming into the Macraes gold processing plant is subjected to being crushed, a grinding flotation process, fine grinding, pressure oxidation CIL (carboninleach) elution and electro winning before it is smelted. Refactory ore has to be subjected to multistage processing in .
The Macraes Process Plant recovers gold by concentrating the metal into a relatively small fraction of flotation concentrate, oxidising the reground concentrate in a pressure oxidation autoclave, washing the oxidised residue and then utilising a carboninleach process to recover gold from the residue.
The Macraes Gold Project, operated by GRD Macraes Limited, engaged GRD Minproc Limited to assist with the evaluation of a pressure oxidation circuit, this being the key component of a recovery enhancement project. The initial study gave sufficient confidence in the process to enter into project execution. GRD Macraes Limited was the first company to...
Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies. The POX process utilizes elevated temperatures (roughly 230 degrees Celsius), elevated pressures (roughly 35 bar or 510 psi), and oxygen to .
Macraes ore Processed at Nearby Gold Processing Plant Ore from the Macraes operation is processed at the adjacent gold processing plant that incorporates a pressure oxidation plant to processes sulphide ore. This plant is one of only three other such plants in the southern hemisphere.
Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing completely updated edition features coverage of established, newly implemented ...
May 18, 2006· Gold extraction at the Macraes gold mine in New Zealand involves concentration of pyrite and arsenopyrite, oxidation of those sulphides, then cyanidation. The ore concentrate is predominantly Otago Schist host rock (andesitic composition) with up to 15% sulphides. The oxidation step is conducted on ore concentrate slurry in an autoclave at 225°C and 3,800 kPa oxygen gas pressure .
Pressure Oxidation is a process for extracting gold from refractory ore.. The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within ores require pretreatment before the gold can be adequately extracted. The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation.
The pressure oxidation process at the modern Macraes mine yields an acidified product consisting mainly of hematite, Aspoor jarosite and iron arsenate, with a range of minor compounds (Craw 2006; Kerr et al. 2015). Historic mine tailings The tailings from the pressure oxidation system at Macraes mine are recombined and severe
Does Macraes Mine Use A Wash Plant The macraes process plant recovers gold by concentrating the metal into a relatively small fraction of flotation concentrate oxidising the reground concentrate in a pressure oxidation autoclave washing the oxidised residue and then utilising a carboninlea Does macraes mine use a wash plant . Get More
Gold extraction at the Macraes gold mine in New Zealand involves concentration of pyrite and arsenopyrite, oxidation of those sulphides, then cyanidation. The ore concentrate is predominantly Otago Schist host rock (andesitic composition) with up to 15% sulphides. The oxidation step is conducted on ore concentrate slurry in an autoclave at 225°C and 3,800 kPa oxygen gas pressure with ...
Mar 16, 2015· Macraes and Reefton were prepared by, or under the supervision of, K Madambi. ... pressure oxidation, OK 300m3 float cells, fine grinding with Isa mill and preg ... Refractory gold associated with sulphides Pressure oxidation autoclave (30 bar and 220ºC) was commissioned in 1999
Jarosite is one of the principal precipitates from process waters of the pressureoxidation autoclave system at the Macraes gold mine, and this jarosite is discharged with the process waters to a ...
Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.
At the same time, continuing process evaluations had identified that Newmont Gold Company''s pressureoxidation technology held some promise for treatment of Macraes flotation concentrates. A study team, combining Macraes Mining Company and GRD Minproc personnel, was assembled to define future mining and processing options.
macraes gold processing plant . Macraes Processing Plant pdf – Grinding Mill China. CIM May 2009 IsaMill Article on, Mtpa plant, the gold concentrate is sent. 800 kilometres by rail to the Macraes pressure oxidation plant for final processing. This proved to be more of a .
The Macraes processing plant is located close to the open pits and has the capacity to treat approximately 6Mt of ore annually. The processing plant includes crushing, grinding, flotation, fine grinding, pressure oxidation, and carbon in leach (CIL).
Gold''s ongoing Business Improvement program, a concerted effort has been made to focus on operational efficiency. One aspect of this has been the efficient use of energy in the gold recovery process. A benchmarking process has been developed for the Macraes operation that includes comparison with other operating mines and theoretical design.
Macraes Gold Mine is located approximately 100km from Dunedin in the Otago region of New ... to concentrate the ore, which is then reground and oxidised in a pressure oxidation autoclave. Gold is extracted from the oxidised residue with a CarbonInLeach process. Overall gold
While benchmarking is, in theory, a simple process, this paper looks at putting benchmarking into practice by catering for variability in ore and associate processing methods. The unit processes discussed include the comminution circuit, flotation plant, pressure oxidation plant and gold recovery circuits. > Download from the AusIMM
The macraes process plant recovers gold by concentrating the metal into a relatively small fraction of flotation concentrate, oxidising the reground concentrate in a pressure oxidation autoclave, washing the oxidised residue and then utilising a carboninleach process to recover gold .
This chapter presents three examples of refractory gold projects—Sansu (bioleaching), Kanowna Belle (concentrate roasting), and Macraes (pressure oxidation)—that were completed by GRD Minproc in the late 1990s to illustrate this principle. These projects were selected for discussion on the basis that they incorporated different technologies.
Oct 12, 2013· OceanaGold Reefton Gold Mine. ... kilometres south to Palmerston from where it is trucked to the Macraes operation for final processing through the autoclave pressure oxidation .
Pressure oxidation of gold ores is therefore a pretreatment leaching step to enhance gold recovery. Although pressure oxidation of gold ores and concentrates does not directly recover gold in a strict sense of the above definition, it is an essential step to enable the gold to be recovered.
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