Arsenic distribution during formation and capping of an oxidised sulphidic minesoil, Macraes mine, New Zealand

Craw, D.; Koons, P. O.; Chappell, D.

doi:10.1016/s0375-6742(02)00202-9

Cited by 30 publications

(20 citation statements)

References 20 publications

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“…Similar arsenic enrichment also occurred in desiccation cracks. The cracks were up to 2 cm wide and extended to depths of more than 1 m in the tailings (Craw, Koons and Chappell, 2002), 13, 21. No evidence was found of substantial water infiltrating through the cracks and into the deep Macraes tailings.…”

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 97%

“…Like the wet season, Acidithiobacillus ferrooxidans may be responsible for catalyzing the dry season oxidation of Fe(II) (Morin et al, 2003). Craw, Koons and Chappell (2002) describe the formation of oxidized layers or 'mine soils' on top of pyrite-and arsenopyrite-bearing tailings over a five-year period at the Macraes gold mine, South Island, New Zealand. Wetting and evaporative drying of the oxidized layers produced a surface crust that was enriched in arsenic (about 5 wt %), mostly as scorodite (Craw, Koons and Chappell, 2002), 17-18, 20.…”

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 99%

“…Craw, Koons and Chappell (2002) describe the formation of oxidized layers or 'mine soils' on top of pyrite-and arsenopyrite-bearing tailings over a five-year period at the Macraes gold mine, South Island, New Zealand. Wetting and evaporative drying of the oxidized layers produced a surface crust that was enriched in arsenic (about 5 wt %), mostly as scorodite (Craw, Koons and Chappell, 2002), 17-18, 20. The scorodite in the oxidized layers not only results from the in situ oxidation of arsenopyrite, but also from precipitation from fluids as they rise through the piles and toward the surface (Craw, Koons and Chappell, 2002), 20.…”

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 99%

“…Wetting and evaporative drying of the oxidized layers produced a surface crust that was enriched in arsenic (about 5 wt %), mostly as scorodite (Craw, Koons and Chappell, 2002), 17-18, 20. The scorodite in the oxidized layers not only results from the in situ oxidation of arsenopyrite, but also from precipitation from fluids as they rise through the piles and toward the surface (Craw, Koons and Chappell, 2002), 20. Similar arsenic enrichment also occurred in desiccation cracks.…”

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 99%

See 3 more Smart Citations

Arsenic in Natural Environments

Henke

2009

Arsenic

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Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 97%

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 99%

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 99%

Section: Behavior Of Arsenic Within Mining Wastesmentioning

confidence: 99%

See 2 more Smart Citations

Arsenic in Natural Environments

Henke

2009

Arsenic

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“…Scorodite is present in naturally weathered rocks (Utsunomiya et al 2003), contaminated soils (Morin et al 2003;Pfeifer et al 2004) and many mine tailings (Craw et al 2002;Davis et al 1996;Mahoney et al 2005). The dissolution of scorodite occurs when the pH is less than 3 (Frau and Ardau 2004;Moldovan and Hendry 2005), releasing As 5+ into the aqueous phase.…”

Section: Dissolution Of As and Fe Mineralsmentioning

confidence: 99%

Effects of magnetite removal on the distribution and speciation of Arsenic in copper tailings and its accumulation in native grass

Liu¹

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Arsenic (As) is considered a significant pollutant in neutral-alkaline copper (Cu) tailings, which may be transported off site via seepage and/or runoff from tailings storage facilities. Iron (Fe) oxides and oxyhydroxides, with their high specific surface area and As affinity, play an important role adsorbing inorganic As in contaminated soil and water. In addition, organic matter (OM) and the resulting organic molecules can not only directly influence As chemical forms through competing functional groups of OM (such as phenolic, carboxyl, hydroxyls, etc.), but OM can also catalyse the transformation of Fe-primary minerals into secondary minerals such as Feoxyhydroxides via microbe-mediated processes. At the Ernest Henry Mine (North Queensland, EHM), the Cu ore processing circuit has recently been modified to recover magnetite (Fe 3 O 4 ) from tailings, which could reduce magnetite concentration in the tailings from 20-30% to as low as 3-5%. However the environmental risks of As mobility in the low magnetite (LM) tailings are yet to be investigated.The present study aimed to investigate the effects of magnetite removal and direct revegetation treatments on As distribution, solubility, and speciation in relation to plant As accumulation in the Cu-tailings. It is hypothesized that the distribution of As into exchangeable and soluble forms may be increased in the low magnetite (LM) tailings, due to the much reduced As adsorption capacity associated with the magnetite and the resultant Fe-oxyhydroxides coating on the surfaces of magnetite following redox processes. In addition, the increased distribution of As into the pore water of the LM tailings may favour As conversion from the inorganic into the organic forms under organic matter amendment and direct revegetation with native grass species. Both LM and high magnetite (HM) tailings were amended with 5% sugarcane residues as a basal treatment to ensure plant survival, in combination with 0, 1 and 5% pine-biochar, in which native grass Red Flinders (Iseilema Vaginiflorum) plants were grown for 4 weeks under glasshouse conditions. Arsenic distribution in the LM and HM tailings was fractionated before and after direct revegetation treatments.The intrinsic As adsorption capacity in the HM tailings was significantly higher than that in the LM. Following the organic matter and direct revegetation treatments, As distribution in the specifically adsorbed and amorphous Fe oxyhydroxide increased in the LM tailings but declined in the HM tailings, compared to the unamended tailings. Total As concentration in the pore water of LM tailings increased by 6-7 fold compared to those in the HM tailings. In the amended and revegetated tailings treatments, As concentrations in the pore water of the LM tailings were significantly elevated compared to those in the HM. The proportion of inorganic As species in the pore water of the LM tailings was approximately 50% higher than those in the HM.After 4 weeks of treatment, the native grass accumulated up to 137 mg kg -1 As in th...

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Mining, Processing and Environment at Macraes

Craw

MacKenzie

2016

SpringerBriefs in World Mineral Deposits

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Arsenic distribution during formation and capping of an oxidised sulphidic minesoil, Macraes mine, New Zealand

Cited by 30 publications

References 20 publications

Arsenic in Natural Environments

Arsenic in Natural Environments

Effects of magnetite removal on the distribution and speciation of Arsenic in copper tailings and its accumulation in native grass

Mining, Processing and Environment at Macraes

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