Keywords: tailings, gold, cyanide leaching, thiourea leaching, thiosulfate leaching, iodine leaching INTRODUCTION The Gango Gold Mine, located at barangay Gango municipality of Libona province of Bukidnon, Philippines, is a "Minahang Bayan" (People's Mining Area), as declared by the Department of Environment and Natural Resources Mines ...

 — 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 …

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 ...

2.0 CYANIDE IN MINING 3 2.1 Cyanide in context 3 2.2 Gold extraction 5 2.3 Alternatives to cyanide 7 2.4 Cyanide treatment, recovery and reuse 7 2.5 Control of process losses 8 3.0 CYANIDE AND THE ENVIRONMENT 9 3.1 Cyanide ecotoxicology 9 CASE STUDY: Sunrise Dam gold mine, tailings and compliance with the ICMC 11 3.2 Environmental …

 — 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 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 …

 — It seems that thermal treatment with catalysts and autoclaved hydrolysis are certainly promising technologies for the detoxification of cyanide tailings with the …

 — The findings from this study are the first to show that Hg(CN)2 complexes are highly stable complexes that can lead to cellular injury and death in mammalian organ systems. Elemental mercury (Hg0) contamination in artisanal and small-scale gold mining (ASGM) communities is widespread, and Hg0-contaminated tailings are often …

 — The use of cyanide (CN), which is characterized by volatility, toxicity and high odor, in gold mining is scarcely addressed in the literature and remain controversial. Environmentalists oppose CN usage as it potentially poses serious environmental threats, whereas economic and mining geologists are in favor of its usage for its extracting …

 — 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 socio-economic benefits of gold extraction through cyanidation of mercury-contaminated tailings notwithstanding, the study establishes inadequate …

 — 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 ...

 — 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 …

In the early days, waste from gold mining in Pinggu District accumulated on the ground and was exposed to the environ - ment. From 2004 to 2006, the Pinggu District Government established tailings ponds to contain all gold tailings in the area. These tailings ponds have been closed for 17 years, mining activities have long been banned and acid mine

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 …

 — 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 ...

 — 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 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 …

 — 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 …

 — 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 ...

 — 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 thermal decomposition rule of cyanide in gold tailings was analyzed, and the effects of different roasting temperatures and roasting durations on cyanide removal …

Most of the cyanide remains in the solution or the slurries after the cyanidation process. The cyanide species in the gold tailings are classified as free cyanide, weak acid dissociation, and metallocyanide complexes. Several methods, such as colorimetric, titrimetric, and electrochemical, have been developed to determine cyanide concentrations ...

 — Wildlife and livestock that ingest bioavailable cyanide compounds in gold mining tailings dams are known to experience cyanide toxicosis. Elevated levels of salinity in open impoundments have been shown to prevent wildlife cyanide toxicosis by reducing drinking and foraging. ... During this study, cyanide-bearing solutions stored in open ...

 — 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 ...

 — 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, …

 — 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 …