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Assessment of options for economic processing of preg-robbing gold ores Dunne, R., Buda, K., Hill, M., Staunton, W., Tjandrawan, V. and Wardell-Johnston, G. (2007) Assessment of options for economic processing of preg-robbing gold ores. In: Proceedings of the World Gold Conference, 22 - 24 October, Cairns, Australia pp. 205-211.
Apr 27, 2017· 1. Refractory gold processing options 2. BIOX process and installed references 3. BIOX developments - ASTER technology for thiocyanate biodegradation and more effective water balance - HiTeCC technology for preg-robbing ores 4. What's next for BIOX? - MesoTHERM technology - high temperature biooxidation for reduced cyanide consumption
Mar 04, 2015· MINTEK's standard analytical tests are targeting characterisation of the gold ores in order to determine the exact reason for the refractoriness as well as optimisation by different processing options in order to increase the gold recovery from such ores [1]. ... recovered via simple cyanidation [6]. · Preg-robbing: Gold occurs with organic ...
Unfortunately gold ores have become more complex and roasting has environmental challenges, so other methods of treatment have had to be found. This paper will review methods of characterising preg-robbing gold ores, method of treatment and cite examples of actual application in the industry. CITATION: Dunne, R, Staunton, W P and Afewu, K, 2013.
Jan 01, 2005· Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are taken to prevent this adsorption reaction from occurring.
preg-robbing gold ores, yielding very low recoveries from traditional CIL methods. Gold recovery from the cyclone underflow was targeted to recover as much gold as possible in the absence of the fine preg-robbing carbon. Gold is recovered by intensive cyanidation and tabling of a gold concentrate produced by gravity from the cyclone underflow.
Gold losses related to carbonaceous matter (CM) during processing are a significant problem in the gold processing industry. Inherent CM in gold ores can behave similarly to activated carbon in its ability to adsorb gold cyanide. This phenomenon is termed preg-robbing as the surface adsorbed gold cannot, for the most part, be recovered.
Assessment of Options for Economic Processing of Preg-Robbing Gold Ores Dunne, R. ; Buda, K. ; Hill, M. ; Staunton, William ; Wardell-Johnson, Greg ; Tjandrawan, V. ( 2012 ) One of the challenges facing the gold industry in the twenty-first century is the continuing need to identify new reserves of economically treatable ores.
In 1999, the RIL process replaced the CIL circuit. Gold recoveries have been reported of around 90% (, 2000). An economic assessment for the processing of preg-robbing gold ores, from mild preg-robbing ores to very high pregrobbing ores, has been provided in 2007 with consideration of different options (Dunne et al., 2007).
The process options for oxygen consuming ores are thus to use alkaline pre-oxidation, or aeration and flotation, followed by a cyanide leach with oxygen addition. Preg-Robbing Complex Ores. Preg-robbing occurs when a gold cyanide complex is removed from solution by some component of the ore.
Request PDF | Assessment of options for economic processing of preg-robbing gold ores | One of the challenges facing the gold industry in the 21st century is the continuing need to identify new ...
economic cut-off gold grade for refractory ores is somewhat higher than non-refractory ores. The mining industry uses a "rule of thumb" of 80% gold recovery to define the transition from a refractory to a non-refractory gold ore. Ones under 80% are considered refractory. In assessing the economic benefit of the extra processing
The simultaneous leach and absorption phases of the CIL process were developed for processing gold ores that contain preg-robbing materials such as natural absorptive carbon. These reduce the gold yield by attracting gold meant for the activated carbon. Simultaneous leaching .
The world's gold production has changed over the past 30 years. The exploration and discovery of large, free-milling gold deposits in major mining districts has declined. Mining companies face a difficult decision. Do they process large, low-grade deposits or look for smaller, often more complex ones in remote, often hard-to-reach locations?
fraction of gold to be treated by CIL leaching utilising high carbon levels. It is critical is to ensure operation at the optimal grind size to maximise liberation of the free gold and minimise pregrobber activity. The ore has been identified as preg-robbing with low recoveries obtained if treated using conventional cyanidation and carbon ...
One of the challenges facing the gold industry in the twenty-first century is the continuing need to identify new reserves of economically treatable ores. Discoveries of large, metallurgically simple orebodies are becoming increasingly rarer, forcing companies to investigate options for the processing of ores which may present recovery, economic and/or environmental issues, requiring ...
Online proceedings. Welcome to IMPC 2014 online articles. This publication contains a selection of articles carefully reviewed by a technical committee composed of experts from the field.You can directly access the articles in this publication using the search box on the left.
It can be seen that the mild preg-robbing concentration of graphitic carbon in the ore, it demonstratescarbonaceous ores, such as CGO 1 and CGO 2 have that other properties are potentially influencing preg-different spectra from highly gold adsorbing activated robbing.carbon or high preg-robbing carbonaceous material presentin some of the ores.
This thesis is a survey of treatments for the recovery of gold from refractory ores. An elucidation of the characteristics leading to gold retention and a definition for refractory gold ore is presented. From this survey of treatments are derived diagnostic conditions that may be useful in predicting the specific refractory characteristics of many ores. Conventional processes are surveyed and ...
GRAVITY GOLD CONFERENCE / BALLARAT, VIC, 21 - 22 SEPTEMBER 2010 1 The Role of Gravity and Intensive Cyanidation in Processing Preg-Robbing Gold Ores N Katsikaros1 and P Davies2 ABSTRACT A fl ow sheet has been developed to treat a high tonnage highly preg-robbing gold .
To extract gold from a low-grade (13.43 g/t) and high-sulfur (39.94wt% sulfide sulfur) Carlin-type gold concentrate from the Nibao deposit, Guizhou, a bio-pretreatment followed by carbon-in-pulp (CIP) cyanide leaching process was used. Various methods were used to detect the low-grade gold in the concentrate; however, only time-of-flight secondary-ion mass spectrometry (TOF-SIMS) was successful.
Nov 12, 2013· (2012). Assessment of options for economic processing of preg-robbing gold ores. Mineral Processing and Extractive Metallurgy: Vol. 121, Australian gold processing, pp. 217-223.
Dec 21, 2016· For example a mine that is processing 100,000 ounces but failing to capture 5 to 10% of its gold due to solution loss, is at current gold prices losing $10 million to $12 million in revenue.
Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited ...
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