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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 them.Refractory ores require pre-treatment 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.
gold flotation macraes Macraes Operation - OceanaGold. Macraes Operation Overview Open Pit and underground operations, with a flotation/POX/CIL processing plant ~ 500 permanent personnel 427 OceanaGold employees; and 73 site based contractors Residential operation: typically within 30 to 70 minutes Company provides
Ore coming into the Macraes gold processing plant is subjected to being crushed, a grinding flotation process, fine grinding, pressure oxidation CIL (carbon-in-leach) elution and electro winning before it is smelted. Refactory ore has to be subjected to multistage processing in .
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.
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).
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.
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.
The reasons for gold-bearing materials refractory nature and behaviour features of carbonaceous matter during pressure oxidation of concentrates were discussed. The .
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
Recovery enhancement at Macraes Gold Project: the choice of pressure oxidation Author La Brooy, S.R., & Cadzow, M.D. Australian Symposium on Recovery of refractory Gold.
Aug 11, 2016· Craw D (2003) Geochemical changes in mine tailings during a transition to pressure–oxidation process discharge, Macraes Mine, New Zealand. J Geochem Explor 80: 81-94 Google Scholar Craw D (2006) Pressure-oxidation autoclave as an analogue for acid-sulphate alteration in epithermal systems.
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.
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 carbon-in-leach process to recover gold from the residue.
of pressure oxidation facilities including application in gold, silver, ... A major revolution in gold processing was the pressure oxidation of refractory, pyritic ores. In these ores, gold is chemically ... (1996), and Macraes in New Zealand (1999) followed. The largest autoclaves in the world were started up by Barrick at the Pueblo Viejo ...
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.
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.
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 .
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
Jarosite is one of the principal precipitates from process waters of the pressure-oxidation autoclave system at the Macraes gold mine, and this jarosite is discharged with the process waters to a ...
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 ...
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 carbon-in-leach process to recover gold from the residue. In detail the plant comprises:
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 .
macraes gold processing plant . Macraes Processing Plant pdf – Grinding Mill China. CIM - May 2009 - IsaMill Article on Macraes.pdf,1.0 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 .
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 .
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