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

Parbhakar-Fox, Anita

doi:10.3390/min6020052

Cited by 12 publications

(4 citation statements)

References 27 publications

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“…Therefore in derelict mine sites, where mineral processing ceased long time ago, residual cyanide may play a minor role in metal mobilization compared to dissolution/precipitation of secondary minerals. This fact was highlighted by Parbhakar-Fox, [30] at the Croydon Au-mines, where heap leaching operations were performed in 1984-1985 on mineralized rhyolites hosting sulfides. Thus, the occurrence of secondary minerals beudantite, hidalgoite, kintoreite and Fe-As-Pb oxides controlled the metal mobilization from these heaps.…”

Section: Mechanisms Of Metal Mobilization In the Leaching Heapsmentioning

confidence: 98%

Metal Mobility and Bioaccessibility from Cyanide Leaching Heaps in a Historical Mine Site

Ruiz

González

Vieira³

et al. 2022

SSRN Journal

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Section: Mechanisms Of Metal Mobilization In the Leaching Heapsmentioning

confidence: 98%

Metal Mobility and Bioaccessibility from Cyanide Leaching Heaps in a Historical Mine Site

Ruiz

González

Vieira³

et al. 2022

SSRN Journal

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“…The best pretreatment process is ultimately determined by the geological formation process and mineralogy of the gold deposit [10][11][12][13]. In general, liberated native gold is recovered by low cost gravity separation, especially for coarse gold [14,15].…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia

et al. 2019

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The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in the form of natural gold and electrum. The gold grade in the mineral was 15.96 g/t and the particle size distribution of gold was extremely uneven. Most of the gold particles were less than 10 μm and wrapped with gold-bearing minerals, making it difficult to achieve liberation during grinding. According to the characteristics of the refractory gold deposit, the gravity–flotation combined beneficiation process was used to recover the liberated coarse gold and the fine gold in the sulphides. The closed-circuit experiments obtained excellent indicators. The grade and recovery of gold in the gravity separation concentrates reached 91.24 g/t and 57.58%, respectively. The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.

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“…It is still a question to be studied. Most arguments in previous studies concentrated on the occurrence states variation of trace metal elements under natural hydrodynamic processes [ 29 , 30 , 31 , 32 ]. Variation of trace metals’ contents could not represent their migration potential, we should also consider the overall occurrence states changing, i.e., the migration abilities of hazardous trace metals.…”

Section: Introductionmentioning

confidence: 99%

Fly Ash Modified Coalmine Solid Wastes for Stabilization of Trace Metals in Mining Damaged Land Reclamation: A Case Study in Xuzhou Coalmine Area

Huang

Wang²,

et al. 2018

IJERPH

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In China, coalmine wastes, such as gangues, are used for reclamation of mining subsided land. However, as waste rocks, gangues contain several trace metal elements, which could be released under natural weathering and hydrodynamic leaching effects and then migrate into the reclamed soil layer. However, it is very difficult to find adequate other backfill materials for substitution of gangues. In this paper, we present a novel method and case study to restrict the migration ability of trace metal elements in gangues by using another kind of coalmine solid waste—fly ashes from coal combustion. In this study, fly ashes were mixed with gangues in different mass proportions 1:0.2, 1:0.4, 1:0.6 and 1:0.8 as new designed backfill materials. Due to the help of fly ash, the occurrence states of studied trace metal elements were greatly changed, and their releasing and migration ability under hydrodynamic leaching effect were also significantly restricted. In this research seven trace metal elements in gangues Cu, Zn, Pb, Cd, Cr, Mn and Ni were studied by using soil column hydrodynamical leaching method and simulated precipitation for one year. The results show that under the driving of natural precipitation trace metal elements were generally transported deep inside the reconstructed land base, i.e., far away from soil layer and most of the trace metal elements were transformed into a bonded state, or combined in inert occurrence states, especially the residual state. With this method, the migration activities of tested trace metal elements were greatly restricted and the environmental potential risk could be significantly reduced.

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

Cited by 12 publications

References 27 publications

Metal Mobility and Bioaccessibility from Cyanide Leaching Heaps in a Historical Mine Site

Metal Mobility and Bioaccessibility from Cyanide Leaching Heaps in a Historical Mine Site

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia

Fly Ash Modified Coalmine Solid Wastes for Stabilization of Trace Metals in Mining Damaged Land Reclamation: A Case Study in Xuzhou Coalmine Area

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