Erosion characteristics and resuspension of sub-aqueous mine tailings

Mian, M Haneef; Yanful, Ernest K.

doi:10.1139/s06-040

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…For example, turbidity can be controlled by the tributary inflow of inorganic particles such as glacial fines that are slow to settle [18, 24]. In shallow water bodies, including lakes [3] and tailings ponds [14], high turbidity can result from re-suspension of bottom sediments by wind driven currents.…”

Section: Introductionmentioning

confidence: 99%

Temporal variations in turbidity in an oil sands pit lake

et al. 2018

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We investigated temporal variations in turbidity in Base Mine Lake, an oil sands pit lake, located in northeast Alberta, Canada. The lake has a surface area of 7.8 km 2 , is 9 m deep, and exhibits seasonal thermal stratification similar to that of natural dimictic lakes. Water turbidity was measured continuously throughout the year with moored sensors, supplemented with turbidity profiles and bottle samples, from sites on the lake. During summer there was a gradual exponential (e-folding time of 25 days) decrease in epilimnetic turbidity due to relatively steady settling of solids from the epilimnion through the thermocline to the hypolimnion. Rapid oscillations (periods of approximately 1 day) in turbidity during summer were due to wind driven internal waves. Convective cooling and wind-shear driven stirring during fall storm events increased the turbidity to an annual high just before ice-on. During these storm events, similarity scaling indicated wind shear imparted greater energy than convective cooling to the turbulence at the base of the water column. Ice suppressed wind forcing and resulted in a rapid decrease in turbidity. The rate of decrease in turbidity following ice-on was initially greater than the rate of decrease in the epilimnion during summer, and then slowed until the under-ice turbidity was a relatively constant value which was sustained during the latter half of the ice-on period. The minimum turbidity during winter was greater than the minimum during summer. Following ice-melt in spring, wind driven stirring increased turbidity until summer stratification began.

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Section: Introductionmentioning

confidence: 99%

Temporal variations in turbidity in an oil sands pit lake

et al. 2018

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“…10 shows the criterion for incipient motion of noncohesive sediments after modification for fine sediments by Cao et al (2006) in a log-log plot. It also shows the relationship between experimentally determined nondimensional critical bed shear stress (i.e., critical mobility parameters) and the corresponding nondimensional particle parameter for the 16 tailings samples of the present study, as well as the studies of Mian and Yanful (2007), Davé et al (2003), and Samad and Yanful (2005). This log-log plot shows that the deviation of the nondimensional critical shear stress (t *-EX -t *-NC ) of the finer samples is quite large and as the tailings particle sizes get larger, the deviation from the Cao et al (2006) and Yalin and da Silva (2001) relations becomes smaller and smaller and, eventually, become nil.…”

Section: ã þmentioning

confidence: 54%

“…The presence of chlorine (and other similar elements) in a treated tap water could decrease the biological oxidation rate while re-suspension using the Teflon stirrer could increase oxidation. Thus, eventually, the net effect of these two compensating factors on the critical shear stress would be negligible (Yanful and Verma 1999;Yanful et al 2000;Mian and Yanful 2007).…”

Section: Sample Preparationmentioning

confidence: 99%

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Role of fines on cohesive behavior of mine tailings inferred from critical shear stress

Geremew

Yanful

2011

Can. Geotech. J.

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The significance of fines on the cohesive behavior of mine tailings has been investigated by examining the incipient motion of the tailings. Sixteen laboratory experiments were performed in a Plexiglas laboratory annular column on re-constituted mine tailings under a 50 cm water cover. Re-suspension was produced by a Teflon stirrer and the velocity field in the column was characterized using a laser Doppler velocimeter (LDV). The pressure change in the boundary layer was also measured with a Preston tube. It was observed that the nondimensional critical shear stresses showed deviation from those of the noncohesive model results at a fines content greater than 50%–55%. An empirical relation that shows the relation between the boundary shear stress deviation and the percent fines in the tailings was proposed. Regression analysis of the experimental results showed that a power law relationship could reasonably be used to describe the relation between the measured nondimensional excess bed shear stress and the erosion rate. It is proposed that the value of β (the erosion rate constant) could be taken as 1 for mine tailings that show cohesive behavior.

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“…HM in samples C4 and C5 could be as a result of HM physical mobility, i.e. erosion, owing to finer particle size and other mineralogical characteristics of the sediments collected at these sites [16].…”

Section: A Bioavailability and Metal Mobilitymentioning

confidence: 99%

Prediction of Metals Bioavailability in the Soils of O’kiep, South Africa

2017

Nov. 27-28, 2017 South Africa ASETWM-17, RCABES-17 &Amp; EBHSSS-17

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Abstract-Mining activities cause environmental pollutionproblems by contaminating nearby areas with heavy metals (HM) such as Cu, Fe, Zn and Al from overburden and leachates. HM can leach into groundwater, be transferred into rivers, and streams by surface run-off, in a form of dissolved species or as a part of suspended solids, culminating in their accumulation to toxic levels in the ecosystem downstream of the source. In view of such mobility attributed to bioavailability, the objective of this study was to assess the bioavailability and mobility of HM species in the sediments around a closed copper mine and subsequent to analysis with XRF, FTIR and a three-step sequential extraction process. Cu, Zn and Mn were predominantly bound to carbonates and could thus be easily desorbed during moisture laden periods, which will increase their bioavailability thus mobility, away from the source. The BCR fractions also showed that under oxidative reductive conditions, Fe species bound to Fe-Mn oxides, thus can be de-bonded in the presence of an acidified environment; therefore, be mobile for redistribute further downstream from the point of source and further contaminating pollutant free areas.

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Erosion characteristics and resuspension of sub-aqueous mine tailings

Cited by 12 publications

References 26 publications

Temporal variations in turbidity in an oil sands pit lake

Temporal variations in turbidity in an oil sands pit lake

Role of fines on cohesive behavior of mine tailings inferred from critical shear stress

Prediction of Metals Bioavailability in the Soils of O’kiep, South Africa

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