Development of a textural index for the prediction of acid rock drainage

Parbhakar-Fox, Anita; Edraki, Mansour; Walters, Steve; Bradshaw, Dee

doi:10.1016/j.mineng.2011.04.019

Cited by 69 publications

(54 citation statements)

References 23 publications

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“…Similar observations have been made for tailings materials dominated by secondary iron-oxides phases at historic sites e.g., [9]. cut-off criterion of 0.3 wt % [17]. Maximum potential acidity (MPA) values calculated using Ssulphide values (Stotal − Ssulphate × 30.6) gave a range of 2.4 to 11.8 kg H2SO4/t.…”

Section: Acid-base Accountingsupporting

confidence: 71%

“…Specifically, the sparse phase liberation technique was performed [16] with a nickel standard used. This permitted the microscale identification of sulphides and allowed for their evaluation using the acid rock drainage index (ARDI) [17].…”

Section: Mineralogical Investigationsmentioning

confidence: 99%

“…nickel standard used. This permitted the microscale identification of sulphides and allowed for their evaluation using the acid rock drainage index (ARDI) [17].…”

Section: Mineralogical Characteristicsmentioning

confidence: 99%

“…Total sulphur contents (S total ; measured by EA) were between 0.08 to 0.41 wt %. Only three samples (225, 230 and 231) measured above the commonly used potentially acid forming (PAF) cut-off criterion of 0.3 wt % [17]. Maximum potential acidity (MPA) values calculated using S sulphide values (S total´Ssulphateˆ3 0.6) gave a range of 2.4 to 11.8 kg H 2 SO 4 /t.…”

Section: Acid-base Accountingmentioning

confidence: 99%

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Geoenvironmental Characterisation of Heap Leach Materials at Abandoned Mines: Croydon Au-Mines, QLD, Australia

Parbhakar-Fox

2016

Minerals

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Abstract:Heap leaching is a well-established metallurgical technology which allows metal recovery (e.g., Au, Cu, U) from low-grade ores. However, spent heap leach materials remaining at abandoned or historic mine sites may represent a potential source of contamination. At the Croydon Au-mines, heap leaching operations (1984)(1985) were performed on mineralized rhyolites hosting sulphides including pyrite, galena, arsenopyrite and minor sphalerite. Characterization of spent heap leach materials (n = 14) was performed using established geochemical and mineralogical techniques, supplemented by automated mineralogical evaluations. Whilst these materials contained low sulphide-sulphur (0.08 to 0.41 wt %) and returned innocuous paste pH values (pH 5.1 to 8.6), they were classified uncertain by net acid producing potential/net acid generating criteria. This was likely due to the reaction of secondary mineral phases (i.e., beudantite, hidalgoite, kintoreite and Fe-As-Pb oxides) during these tests. It is hypothesised that during heap leaching, gangue sulphides have differentially reacted with the cyanide lixiviant, pre-conditioning the formation of these complex secondary phases during surficial oxidation, after heap leaching termination. These materials are considered to represent a moderate geoenvironmental risk as dissolved Pb in basal leachates is in excess of the World Health Organization (WHO 2006) guideline values. Considering this, these materials should be included in ongoing rehabilitation works at the site.

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Section: Acid-base Accountingsupporting

confidence: 71%

Section: Mineralogical Investigationsmentioning

confidence: 99%

“…nickel standard used. This permitted the microscale identification of sulphides and allowed for their evaluation using the acid rock drainage index (ARDI) [17].…”

Section: Mineralogical Characteristicsmentioning

confidence: 99%

Section: Acid-base Accountingmentioning

confidence: 99%

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Geoenvironmental Characterisation of Heap Leach Materials at Abandoned Mines: Croydon Au-Mines, QLD, Australia

Parbhakar-Fox

2016

Minerals

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“…Acid-base accounting (ABA) is static test does not take into account the effect of many of these factors, particularly the rate and evolution of oxidation and neutralization processes. Therefore, in order to increase reliability of evaluation related to AMD generation, kinetic tests were mainly performed previously (Lawrence and Marchant, 1991;Morin and Hutt, 1997;Sapsford et al, 2009;Parbhakar-Fox et al, 2011, 2013 to simulate actual field oxidation and neutralization processes at laboratory scale. Bradham and Caruccio (1990) stated that the kinetic column test is considered to be more representative of actual field conditions.…”

Section: Introductionmentioning

confidence: 99%