Assessing the environmental impact of gold production from …
A simplified system boundary is also observed in Fig. 2, showing various stages from comminution to electrowinning for producing 1 kg gold from double refractory ores in a roasting process plant. A roasting facility in Nevada was developed to process 12,000 t of double refractory ore daily (Thomas et al., 1997; Thomas and Cole, 2016).
Recovery Refractory Resources
refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption processes. More specifically, it is an ore that has a gold recovery rate of …
Processing technologies for gold-telluride ores
tract gold. In a modern gold processing plant, the recovery can be up to 98% with the aid of the latest concentration and smelting techniques. A successful gold recovery strategy re-lies on a fundamental understanding of the ore mineralogy and its chemical/physical behaviors under various leach, flotation, and oxidation conditions. An overview ...
Gold Extraction from a Refractory Sulfide …
Many gold deposits contain finely disseminated gold particles in iron sulfide minerals such as pyrite. These minerals are called refractory gold ores because of the presence of gold, which occurs either as disseminated fine …
Exploring Non-ammoniacal Thiosulfate Gold Leaching and
The application of pressure oxidation (POX) followed by thiosulfate gold leaching is an efficient method used to extract gold from double refractory gold ores containing both sulfide and carbonaceous matter. This process is expected to result in high gold recovery rates, as it liberates gold from sulfides and eliminates the preg-robbing behavior of carbonaceous matter. …
Getting a Handle on Refractory Ore May …
These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. A refractory ore generally contains sulphide minerals, organic carbon, or both, generally leading to a more …
Processing of refractory gold ores
The best choice of a processing route to treat a refractory ore will in most cases be site specific, due mainly to the metallurgical and mineralogical characteristics of the ore. The …
Performance Evaluation of Fe-Al Bimetallic …
Acid mine drainage (AMD) is a serious environmental issue associated with mining due to its acidic pH and potentially toxic elements (PTE) content. This study investigated the performance of the Fe-Al bimetallic …
ALTA Gold 2012 E-Doc
ore reserves. Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring 'preg robbing' carbonaceous materials or gold physically
Recovery of gold from sulfide refractory gold ore: Oxidation …
Processing refractory gold ore with conventional methods results in low recovery of gold with high environmental impact (Qin, Guo, Tian, Yu, et al., 2021). Leaching gold from refractory ore faces ...
Gold mineral processing
Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory. Refractory pre-treatment processes include pressure oxidation, biological oxidation and various forms of ...
The reasons of gold refractory, Gold ore classification, and
The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.
Complete process and equipment solutions for refractory …
Selecting the preferred process for the treatment of a refractory gold ore or concentrate involves a number of aspects including the metallurgical and mineralogical characteristics of the ore, any impurities, the size and location of the project, local conditions and regulations, and utility requirements.
EVALUATING PROCESS OPTIONS FOR …
A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted.
Treatment of carbonaceous refractory gold ores
Underlying the difficulty of processing refractory gold ores is their mineralogy. This type of ore may have, (1) gold in intimate association with and locked in sulphide minerals, (2) gold associated with carbonaceous matter capable of adsorbing aurocyanide and (3) gold in solid solution with other minerals. ... Refractory ore treatment by this ...
Integrated Technology for Processing Gold-Bearing Ore …
the category of refractory mineral raw materials [1, 2]. The extraction of gold from these ores is of particular impor-tance for all gold-mining and processing countries in the world [3], since the reserves of placer gold are depleted, oxidized ore is easily processed and the strategic needs to
Establishing thE ProcEss MinEralogy of gold orEs
refractory carbonaceous sulfide ore is at Barrick's Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfidic/ carbonaceous ore. These ores are pretreated by autoclave and roaster prior to cyanide leaching (Thomas et al., 2000; Wickens et al., 2003). In the Jinya Carlin-type gold deposit in China, gold
Enhanced Gold Recovery from Alkaline Pressure Oxidized Refractory …
Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge due to passivation and incomplete oxidation of mineral. Gold ore from Goldstrike, NV, is a typical refractory gold ore containing sulfide and carbonaceous matter. Alkaline pressure oxidation …
Pore Evolution in Refractory Gold Ore Formed by …
Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold …
Gold Mining Process Development – Denver Mineral …
Refractory ore processing methods almost always serve only one purpose, to treat ores that will not liberate their values by conventional cyanide leaching. The refractory ore treatment process is then followed by a conventional cyanidation step. Refractory ore processing methods include:
Pore Evolution in Refractory Gold Ore Formed by Oxidation …
Flotation–preoxidation–cyanidation methods are used to improve recovery of refractory gold, but the gold recovery is limited to 72.2% after only treatment by the flotation process. 28 The development of oxidation roasting technologies has improved the market prospects of dealing with gold ore and other refractory ores despite the problems ...
Mineralogical characteristics and treatment of refractory …
Process mineralogy of refractory gold ore in thiosulfate solutions. Hydrometallurgy, Volume 182, 2018, pp. 104-113. Juan D. Ospina-Correa, …, Jorge A. Calderón-Gutiérrez. Improvements in gold ore cyanidation by pre-oxidation with hydrogen peroxide. Minerals Engineering, Volume 108, 2017, pp. 67-70.
Processing of refractory gold ores | Semantic Scholar
The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was … Expand. 5. Save. Gold deportment and leaching study from a pressure oxidation residue of chalcopyrite concentrate.
Potential pre-treatment and processing routes for …
In refractory gold ores, the gold is highly encapsulated in the sulfide matrix and pre-treatment is an important process to recover gold from the sulfide minerals. The sulfide minerals interfere …
Depositional environment
Keywords: gold processing, refractory gold, ore mineralogy. Introduction. Gold has been an important commodity throughout much of human history, and is thought to be one of the earliest metals mined (Kongolo and Mwema, 1998; Reardon, 2011). Early gold recovery from stream bed sediments involved manual or gravity-based separation methods; beyond ...
Processing of refractory gold ores
The best choice of a processing route to treat a refractory ore will in most cases be site specific, due mainly to the metallurgical and mineralogical characteristics of the ore. The successful application of these processing techniques can result in mining operations that would otherwise have been impossible. However for an increasing number ...
Refractory Gold Ore Treatment Methods
The use of roasting for the oxidationof sulfides has declined over the years. However. Resolute Mining resurrected the Syama project in Mali by converting the process from a whole-ore roast to flotation followed by …
Processing technologies for gold-telluride ores
Re-fractory ores, however, require fine grinding and a further pre-treatment step, such as roasting and pressure oxidation, to render the gold ores amenable to extraction. Usually, gold telluride …
DEVELOPMENTS IN THE PROCESSING OF REFRACTORY …
More than one category can apply to a particular ore deposit; e.g. double refractory ores in Nevada with gold locked in iron sulphides plus preg-robbing carbonaceous material. 4 ... • The process has been tested at a mini-plant level. 35 NEOMET PROCESS (CONT.) NEOMET PROCESS FLOWSHEET Ref: Neomet Paper, ALTA 2011 .
Recent challenges in biological cyanidation and oxidation of …
These methods are selected based on the physicochemical structure of gold, ore minerals, and the encapsulation structure of gold grain. Usually, the free gold can be easily recovered by using a simple leaching process or free milling process. On the other hand, refractory gold ore is processed using chemical or biological methods (Haque 1987 ...