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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 .
The pressure oxidation process at the modern Macraes mine yields an acidified product consisting mainly of hematite, As-poor 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-
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.
Geochemical changes in mine tailings during a transition to pressure–oxidation process discharge, Macraes Mine, New Zealand, J Geochem Expl, 80: 81-94 Petrie, B S, Craw, D, Ryan, C G, 2005. Geological controls on refractory ore in an orogenic gold deposit, Macraes mine, New Zealand, Mineralium Deposita, (in press).
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.
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 ...
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 operation.This completely updated edition features coverage of established, newly implemented ...
even at these comminution levels the recovery became increasingly uneconomic at lower gold prices. Pressure Oxidation (POX) was added to the process in 1998. Pressure oxidation oxidises the sulphide minerals breaking the crystal structures of the pyrite and arsenopyrite enabling cyanide to access the fine gold.
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.
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 .
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).
Macraes and Reefton were prepared by, or under the supervision of, K Madambi. ... (pressure oxidation and CIL) 95%, with overall at 81% 80 staff: 4 operating crews with in house maint. ... Refractory gold associated with sulphides Pressure oxidation autoclave (30 bar and 220ºC) was commissioned in 1999
At the same time, continuing process evaluations had identified that Newmont Gold Company's pressure-oxidation 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.
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 .
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.
MORE DETAILS: Macraes MiningLink The largest most visited mining. 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 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
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.
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
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 study consisted of a 3.0 Mtpy gold plant consisting of relocating the existing Pressure Oxidation circuit and all new additional equipment as well as a PFS level study into a 1.0 Mt/y tungsten concentrate plant to process high Scheelite ore. The feasibility study was developed utilising operating costs developed from the mature Macraes gold ...
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 .
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
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