Influence of freeze–thaw dynamics on internal geochemical evolution of low sulfide waste rock

Sinclair, Sean A.; Pham, N.; Amos, Richard T.; Sego, David C.; Smith, Leslie; Blowes, David W.

doi:10.1016/j.apgeochem.2015.05.017

Cited by 21 publications

(9 citation statements)

References 32 publications

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“…The solute and pH relations in leachate from the humidity cell and test pile experiments in the Diavik Waste Rock Project has been characterized by Langman et al (2014), Sinclair (2014), and Smith et al (2013a,b), and a relation between SO 4 2and Ni (and Co) in acidic leachate (median pH of 4.6 for the humidity cell and test-pile leachates) has been observed ( Fig. 2).…”

Section: The Relation Of S and Ni In Waste Rock Leachatementioning

confidence: 90%

“…2). Nickel hydroxide [Ni(OH) 2 ] is a common control for Ni in ARD (Alpers et al, 1994), but leachate from the humidity cells and test piles was consistently undersaturated for this phase (Sinclair, 2014;Smith et al, 2013a). Additionally, the adsorption of Ni on Fe (oxyhydr)oxides can retard the release of Ni into solution (Boujelben and Elouear, 2009;Cornell, 1991;Galan et al, 2003;Gunsinger et al, 2006;Lee et al, 2002).…”

Section: The Relation Of S and Ni In Waste Rock Leachatementioning

confidence: 99%

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The mineral and aqueous phase evolution of sulfur and nickel with weathering of pyrrhotite in a low sulfide, granitic waste rock

et al. 2015

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The release of S and metals from the weathering of waste rock pyrrhotite [Fe (1-x) S] is affected by oxidation pathways, the presence and concentration of Fe-substitution metals (e.g. Ni), and Fe (oxyhydr)oxide products. A 4C (monoclinic) pyrrhotite [Fe 7 S 8 , Ni:Fe substitution of about 1:200] in a low sulfide waste rock was weathered in the laboratory and at a field site to identify the evolution of S oxidation, distribution and coordination of Ni, and possible adsorption of Ni on secondary Fe minerals. Mineral phase S was present in the-2,-1, 0, +4, and +6 oxidation states prior to its release as SO 4 2into solution. The thiosulfate [S 2 O 3 2-] pathway of sulfide oxidation was indicated by the presence of polythionates and S 2 O 3 2-. Sulfur as S 2 O 3 2was more persistent than sulfite [SO 3 2-] prior to oxidation to SO 4 2-. The release of Ni during the oxidative dissolution of pyrrhotite was influenced by its distribution in the grain: diffuse throughout the grain (solid solution mineral) or concentrated in exsolved pentlandite [(Fe,Ni) 9 S 8 ] lamellae within the pyrrhotite. With the oxidation of S, Ni coordination changed from bonding with reduced S species to bonding with oxygen prior to its release with SO 4 2-. Sulfur as SO 4 2typically stayed in solution with release from the pyrrhotite, but the solubility of released Ni was dependent on leachate pH. A

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Section: The Relation Of S and Ni In Waste Rock Leachatementioning

confidence: 90%

Section: The Relation Of S and Ni In Waste Rock Leachatementioning

confidence: 99%

The mineral and aqueous phase evolution of sulfur and nickel with weathering of pyrrhotite in a low sulfide, granitic waste rock

et al. 2015

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“…Due to the latitude at which the deposit is located (i.e., in northern Europe) the local climate is heavily impacted on a season by season basis, such that the development of freeze-thaw cycles is common. With respect to AMD, this has implications on the generation of acid by sulphides, mobility of metals, and release of such products into the environment [45]. During winter months (December-May), oxidation of sulphidic waste material, particularly within waste rock piles, is reduced [45], and otherwise fluid AMD can become frozen, preventing its release into the environment.…”

Section: Waste Mangement Planningmentioning

confidence: 99%

“…With respect to AMD, this has implications on the generation of acid by sulphides, mobility of metals, and release of such products into the environment [45]. During winter months (December-May), oxidation of sulphidic waste material, particularly within waste rock piles, is reduced [45], and otherwise fluid AMD can become frozen, preventing its release into the environment. The permeability of waste rock piles is also reduced (and thus the hydrology altered), however percolation of water in coarse-grained piles during the summer months is possible [45].…”

Section: Waste Mangement Planningmentioning

confidence: 99%

“…During winter months (December-May), oxidation of sulphidic waste material, particularly within waste rock piles, is reduced [45], and otherwise fluid AMD can become frozen, preventing its release into the environment. The permeability of waste rock piles is also reduced (and thus the hydrology altered), however percolation of water in coarse-grained piles during the summer months is possible [45]. These factors must be considered when engineering the final waste pile design.…”

Section: Waste Mangement Planningmentioning

confidence: 99%

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Forecasting Geoenvironmental Risks: Integrated Applications of Mineralogical and Chemical Data

et al. 2018

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Management of solid mine wastes requires detailed material characterisation at the start of a project to minimize opportunities for the generation of acid and metalliferous drainage (AMD). Mine planning must focus on obtaining a thorough understanding of the environmental properties of the future waste rock materials. Using drill core obtained from a porphyry Cu project in Northern Europe, this study demonstrates the integrated application of mineralogical and geochemical data to enable the construction of enviro-geometallurgical models. Geoenvironmental core logging, static chemical testing, bulk- and hyperspectral mineralogical techniques, and calculated mineralogy from assay techniques were used to critically evaluate the potential for AMD formation. These techniques provide value-adding opportunities to existing datasets and provide robust cross-validation methods for each technique. A new geoenvironmental logging code and a new geoenvironmental index using hyperspectral mineralogical data (Hy-GI) were developed and embedded into the geochemistry-mineralogy-texture-geometallurgy (GMTG) approach for waste characterisation. This approach is recommended for new mining projects (i.e., early life-of-mine stages) to ensure accurate geoenvironmental forecasting, therefore facilitating the development of an effective waste management plan that minimizes geoenvironmental risks posed by the mined materials.

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Cyanides, Arsenic, and Noble Metals in Abandoned Gold Ore Cyanidation Tailings and Surface Waters in a Permafrost Region (Transbaikal Territory, Russia)

et al. 2021

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Influence of freeze–thaw dynamics on internal geochemical evolution of low sulfide waste rock

Cited by 21 publications

References 32 publications

The mineral and aqueous phase evolution of sulfur and nickel with weathering of pyrrhotite in a low sulfide, granitic waste rock

The mineral and aqueous phase evolution of sulfur and nickel with weathering of pyrrhotite in a low sulfide, granitic waste rock

Forecasting Geoenvironmental Risks: Integrated Applications of Mineralogical and Chemical Data

Cyanides, Arsenic, and Noble Metals in Abandoned Gold Ore Cyanidation Tailings and Surface Waters in a Permafrost Region (Transbaikal Territory, Russia)

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