Cyanide concentrations below 50 mg/L weak-acid-dissociable (WAD) are deemed safe to wildlife but are considered an interim benchmark for discharge into tailings storage …
— Cyanide (CN −) is a silent killer and is highly toxic to the environment and biological life (Kaszeta, 2020).Also known as isocyanides, cyanide ions, cyanide anions, or cyanide (1−) ions, cyanides are composed of a carbon atom triple bonded to a nitrogen atom (C N) (Adeola, 2011).Given its acute toxicity, cyanide is harmful to health and the …
— The thermal decomposition rule of cyanide in gold tailings was analyzed, and the effects of different roasting temperatures and roasting durations on cyanide removal …
— Understanding the behavior of cyanide in rivers is of utmost importance as it has a direct impact on the health of people who depend on these water sources. Cyanide contamination from gold mining activities poses a significant environmental threat to river ecosystems, particularly in southern Ecuador. This study aimed to investigate the …
— The cyanide content of gold tailings exceeds the standard seriously due to the cyanide extraction process. In order to improve the resource utilization efficiency of gold tailings, a medium ...
— Previous gold mining activities resulted in the discharge of tailing materials containing various hazardous trace metals such as manganese (Mn), nickel (Ni), arsenic (As), cadmium (Cd), cobalt (Co ...
— Although the total cyanide (T-CN) concentration (1.4–1.9 mg kg −1) found in most of the study area falls within the limits of gold mining tailing values for American sites (1.5–23 mg kg −1), it is worth noting that the values of the tailings of the last used mining operation exceed it (25.2–518 mg kg −1) and persist at the site. The ...
— The aim of this study was to investigate the availability and fate of cyanide in gold mill solid tailings. For this purpose, aged (6–9 years) and recently discharged (3 months) tailings were sampled at various depths from two …
— The generation of tailings in the world today is immense, since only ounces or pounds of metals are extracted for each ton of ore processed. In 2022, it was estimated that more than 14 billion metric tons of mining tailings were produced per year in the world. Currently, many environmental problems associated with tailings management in both …
Deportment studies of gold in tailings show that gold losses can occur either as liberated gold particles or as fine gold locked in sulfide and non-sulfide minerals, with locked-gold predominating. Studies ... cyanide. Gold in Figure 1d occurs as submicroscopic gold in disseminated pyrite, making the gold extremely refractory. ...
— 1. Introduction. 8.75 billion tonnes of waste globally are created from gold mining annually (Earthworks and Oxfam America 2004).Solid waste streams generated from gold mining and processing, better known as mine tailings, still contain a significant mass of gold, with a global estimate of around 425 tonnes (Ogola et al., 2017).The U.S. …
— Cyanide and potentially toxic elements in tailings from gold mining can cause serious pollution, and harm the surrounding environment through rainfall seepage and leakage from tailings ponds. In this study, 40 surface soil samples were collected from the Liujiadian tailings pond basin in Pinggu District, Beijing, and the contents of cyanide, Sb, …
— Cyanide tailings are industrial hazardous solid wastes arising from gold mining industry. Hundreds of millions of tons of cyanide tailings that contain highly toxic cyanides and various valuable ...
— Cyanide and potentially toxic elements in tailings from gold mining can cause serious pollution, and harm the surrounding environment through rainfall seepage and leakage from tailings ponds.
— The thermal decomposition rule of cyanide in gold tailings was analyzed, and the effects of different roasting temperatures and roasting durations on cyanide removal …
The formation of copper-cyanide complex occurs preferentially to gold cyanide complex indicating the relative importance of economic vs. environmental considerations in the tailings water. Management of cyanide to a perceived threshold has inherent risks since cyanide has a steep toxicity response curve; is difficult to accurately measure in ...
— Cyanide tailings are industrial hazardous solid wastes arising from gold mining industry. Hundreds of millions of tons of cyanide tailings that contain highly toxic cyanides and various valuable elements, such as gold, silver, iron, sulfur, copper, lead, and zinc are generated and discharged to tailing dams every year. ... In this study, the ...
The planetGOLD Programme, together with the UNEP Global Mercury Partnership and its area of work on Mercury in Artisanal and Small Scale Gold Mining, jointly organized an online information-sharing session dedicated to best management practices in the use of cyanide on Tuesday 25 January 2022.. As the use of cyanide becomes more prevalent …
— The disposal of mining wastes that contain cyanide are dumped in tailings from gold extraction is a public concern in mining countries such as South Africa. Many studies have shown the potential of microorganisms to degrade cyanide. However, no in-situ exploration, in tailings contaminated with cyan …
— The socio-economic benefits of gold extraction through cyanidation of mercury-contaminated tailings notwithstanding, the study establishes inadequate …
— Gold is a highly required material for a wide range of personal and industrial applications. The high demand for gold, together with the shortage of natural resources and high pollution potential of wastes generated during mining and ore processing activities led to search for alternative sources of gold. A possible source is represented by mine …
gold. The use of cyanide mostly occurs at gold pro-cessing centres and larger AGSM operators within gold mining communities (Velasquez-Lopez et al., 2011; Veiga et al., 2014). Central Processing Centres in AGSM communities are facilities where miners send their gold-bearing ores or tailings to be extracted by dedicated operators for a fee.
— Request PDF | A kinetic-mechanistic study of cyanide degradation which can be contained in mining tailings dams using a divided electrolytic cell | Cyanidation is considered the most employed ...
— The study was conducted on the status of the quality of wastewater from the tailings dam of Central Africa Gold Limited in Bibiani, Ghana, to ascertain the level of contamination of the wastewater.
— The cyanide species in the gold tailings are classified as free cyanide, weak acid dissociation, and metallocyanide complexes. Several methods, such as …
— Cyanide tailings used in the study by Zhang et al. (2012) are residues obtained after extracting gold from gold tailings by conventional cyanidation or roasting-cyanidation processes. ... Gold mining tailing: environmental availability of metals and human health risk assessment. J Hazard Matert, 397 (2020) ...
— The disposal of mining wastes that contain cyanide are dumped in tailings from gold extraction is a public concern in mining countries such as South Africa. Many …
— This study assesses cyanide and cyanidation wastes management practices among small, medium and large-scale gold leaching plants in Siaya County, Kenya. The socio-economic benefits of gold extraction through cyanidation of mercury-contaminated tailings notwithstanding, the study establishes inadequa …
— Free cyanide is not persistent in the tailings environment (Botz et al., 1995, Resource Assessment Commission, 1991) and will degrade through physical, chemical and biological processes, into other less toxic chemicals (Environment Australia, 2003).Natural degradation, primarily by volatilisation of cyanide in TSFs, is the most common method …
— 1. Introduction. In recent decades, gold mining expanded from its historical core (South Africa, the United States, Canada, Australia, and Russia) into a wide range of new gold mining regions, many of them located in the global South (Verbrugge and Geenen, 2020).In addition to the expansion of large-scale industrial mining, many of …
— Cyanide tailings are industrial hazardous solid wastes arising from gold mining industry. Hundreds of millions of tons of cyanide tailings that contain highly toxic …
— It seems that thermal treatment with catalysts and autoclaved hydrolysis are certainly promising technologies for the detoxification of cyanide tailings with the …
— Artisanal and small-scale mining are informal activities used as a source of family income in many countries, mostly in developing regions. They also represent rudimentary practices that generate environmental and health impacts. In these activities, gold is the main mineral extracted commonly using cyanide leaching as the main …
— Due to this type of operations, it is possible to find mining tailings dams which contain 0–25 ppm of cyanide species (Dash et al., 2009), as can be seen this concentration range is lower than that found in some cigarettes (0.5 mg/cigarette), however, from an environmental viewpoint, the accumulation of cyanide species in the mining tailings ...
