China
Africa
Explore chapters and articles related to this topic
Wastewaters Treatable in EEBs
Published in James Higgins, Al Mattes, William Stiebel, Brent Wootton, Eco-Engineered Bioreactors, 2017
James Higgins, Al Mattes, William Stiebel, Brent Wootton
The process is adversely affected by some other metals as well as free sulfur and sulfides. In the carbon-in-pulp or the carbon-in-leach processes used at gold mines and heap leach facilities, complexed gold is often removed from slurried crushed ore by carbon adsorption. At surface and underground gold mines, the remaining materials (tailings, often >99% of the total) are pumped as a slurry to a tailings pond where the solids settle out.
Assessment of heavy metal pollution associated with tailing dam in gold mining area, southern ethiopia
Published in Geosystem Engineering, 2023
Gera Techane, Geremew Sahilu, Lena Alakangas, Worku Mulat, Helmut Kloos
Mining waste can be divided into mine tailings, produced due to processing of the ore, and mine waste rock dump generated when uncovering the ore body (Niu et al., 2021). Tailing ponds are one of the main heavy metal pollution sources in mining areas (Zhang et al., 2020). They contain potentially toxic elements, which can pose a serious impact on the environment (Bouzekri et al., 2020; Zhao et al., 2021). Legadembi mine has a carbon-in-pulp (CIP) circuit processing plant that leaches gold by a cyanide solution. The tailings from the processing plant with a cyanide concentration of about 100 mg/kg are discharged into the tailings dam (an earth embankment containment dam) through a pipeline. A previous study has shown that the tailing dam of the Legadembi primary gold mine is the most important sink for several heavy metals (Getaneh & Alemayehu, 2006).
Stratigraphy and mineralogy of tailings at Macraes gold mine, southern New Zealand
Published in New Zealand Journal of Geology and Geophysics, 2022
Erin Weightman, Dave Craw, Tom Snow, Hannah Christenson, Gemma Kerr
The Macraes orogenic gold mine has been developed in a mineralised shear zone within the Mesozoic Otago Schist (Figure 1A; Craw and MacKenzie 2016). Since the modern mine opened in 1990, a series of open pits has been excavated along the northwest strike of the shear zone (Figure 1B), as well as an underground extension of one pit. Ore is dominated by silicates of the lower greenschist facies schist, with the sulphide minerals pyrite and arsenopyrite disseminated through the silicates and locally concentrated in quartz veins (Craw and MacKenzie 2016). Gold is encapsulated in the pyrite and arsenopyrite as micron-scale particles, so the processing system initially concentrated these sulphides via flotation from ore crushed and ground to ∼50 µm. The resulting concentrate is further ground to ∼15 µm before passing through the gold extraction system that involves carbon-in-pulp cyanidation.
A review of Preg-robbing and the impact of chloride ions in the pressure oxidation of double refractory ores
Published in Mineral Processing and Extractive Metallurgy Review, 2022
Wei Sung ng, Qiankun wang, Miao chen
The two main types of cyanide leaching circuits that utilize activated carbon include carbon-in-pulp (CIP) and carbon-in-leach (CIL) (Bhappu 1990; Marsden and House 2006; Staunton 2016). CIP features two distinct leaching and adsorption stages, where activated carbon is present only in the adsorption stage, while CIL has a single stage where leaching and adsorption proceed at the same time. Effectively, this means activated carbon is present in all stages of CIL, and the presence of activated carbon in the cyanide-containing tanks in CIL provides competition for the soluble gold against potential preg-robbers in the ore, making CIL more suitable for processing preg-robbing ores. Nevertheless, a common practice is to operate the leaching circuit as a hybrid CIP/CIL, with the first (or more) tank(s) free of carbon and acting as a pre-leach stage, such that the carbon in the second tank contacts a richer solution for faster adsorption kinetics. This may result in increased gold losses, due to gold uptake on the preg-robbing materials in the carbon-free first tank (Dunne et al. 2012).