Realistic beach slope prediction and design

Seddon, Keith; Fitton, Timothy

doi:10.36487/acg_rep/1104_26_seddon

Cited by 12 publications

(33 citation statements)

References 5 publications

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“…On the basis of observations of collected data on thickeners, Seddon and Fitton (2011) proposed that thickener performance could be evaluated on a statistical basis. The two variables that were investigated were solids concentration and mass flux; these being the values most commonly recorded during operations.…”

Section: Overviewmentioning

confidence: 99%

“…However, for the purpose of this paper, the use of daily inputs has been retained, as to date most of the analysis of variation has been on this basis. Seddon and Fitton (2011) characterised thickener performance in terms of statistical normal distributions, formulated in terms of a mean and a standard deviation. For comparing the spread or variability over different distributions, the coefficient of variability (CV) was used, where CV = standard deviation/mean.…”

Section: Overviewmentioning

confidence: 99%

“…In practice, beach profiles with a greater or lesser degree of concavity are commonly encountered for thickened and paste tailings beaches. Seddon and Fitton (2011) proposed that concave beach profiles can be attributed to the fact that tailings rheology and discharge rates do not stay constant over a period of time. Data demonstrating that the variable throughput of thickeners can be characterised on a statistical basis was also presented.…”

Section: Introductionmentioning

confidence: 99%

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Stochastic modelling of beach profiles including the influence of thickener performance

Seddon¹,

Pirouz²,

Javadi³

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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It is generally well accepted that in the design and operation of thickened tailings storages, 'better' thickener performance will improve the beach profile, and thereby enhance the overall performance of the stack. Conversely, if the thickener does not perform well, it is unlikely that the designed beach profile will be achieved. The aim of this paper is to demonstrate quantitatively how thickener performance can influence the achieved beach profile in a thickened tailings scheme. The two contributing factors are: (i) solids concentration (as a surrogate for actual rheology), and (ii) throughput or flow rate. There are two considerations for each influencing factor. For solids concentration, these are: (i) does the thickener achieve the design target value, and (ii) what is the variability around this value. For flow rate, these are: (i) is the plant running at, above or below the design throughput, and (ii) what is the variability around this value. This paper presents an extension of previous work by the authors on the subject of stochastic beach profile prediction. Seddon et al. (2015) showed that the statistical variability of thickener underflow (in terms of flow rate and solids concentration) could be used in an incremental deposition model to predict realistic beach profiles. Additional statistics of actual thickener performance were presented by Pirouz et al. (2017). This paper uses a previously generated profile (Seddon et al. 2015) as a starting point, and investigates the influence of: (i) increased variability in performance (resulting in greater concavity in the profile), and (ii) an overall reduction in achieved underflow solids concentration combined with an increase in throughput (together resulting in greater concavity and an overall flatter profile).

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Section: Overviewmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stochastic modelling of beach profiles including the influence of thickener performance

Seddon¹,

Pirouz²,

Javadi³

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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“…The performance of the thickeners at these two mines is quite uniform compared to some, though it is noted that in both cases there is a general trend for the concentration to increase over time, due to the mine operators moving to increase water recovery. Seddon and Fitton (2011) presented relevant data for a number of mines in an effort to investigate this variability, and they further proposed a design approach for thickened tailings schemes that made allowance for such variability in the slurry feed.…”

Section: Thickening Can Be Targeted To Be To An 'Absolute' Solids Conmentioning

confidence: 99%

Paste and thickened tailings – myth busting and clarification

Fitton¹,

Seddon²

2013

Proceedings of the 16th International Seminar on Paste and Thickened Tailings

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It is the contention of this paper that there remains considerable confusion regarding the mechanisms and benefits of thickened tailings schemes. The terminology and interpretation of terms like 'thickened tailings' and 'paste' receive some consideration, in light of some observed contradiction in the industry. It is also noted that a number of tailings related misconceptions prevail amongst tailings practitioners. This paper attempts to clarify some of these issues, with the intention of dispelling some tailings myths. The subject of tailings beach slope prediction is one particular topic that deserves some consideration in the interests of clarity. A large portion of this paper is devoted to this topic, which has been approached from a number of directions over the past 40 years. Various prediction methods have been presented. Some prediction methods are analytical, with no need for any flume testing. Others have relied on a deposition test in a flume. The use of different types of flumes and deposition tests, either for providing validating data or input data, has created a great deal of confusion over what works and what does not, what is relevant and what is not. There has also been further confusion created by the presentation of the results, with some workers presenting fitted data as predictions. This paper discusses the mechanism of tailings deposition, with a view to evaluating the applicability of some of the approaches that have been presented. Various flume types and their relevance to the process are then discussed. Deposition tests and trials are also discussed in terms of the beach slopes that have been observed. Finally, some protocols are proposed for making the presentation of data more consistent and transparent.

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“…This should in turn be used to predict a beach profile (which will be concave). A method for carrying out such work has been presented in Seddon and Fitton (2011).…”

Section: Compute V Cns Using Equation 24 Repeat 1 Through 5 Untilmentioning

confidence: 99%

A tailings beach slope model featuring plug flow

Fitton¹,

Slatter²

2013

Proceedings of the 16th International Seminar on Paste and Thickened Tailings

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It has been observed that plug flow can occur in the open channels that naturally form on a tailings beach if the tailings slurry is sufficiently thickened. Plug flow occurs when a yield stress fluid develops an unsheared zone (or plug) in the centre of a channel, pipe or other conduit. It is caused when the yield stress of the slurry is greater than the shear stresses that are acting on it. This paper presents a new tailings beach slope prediction model that incorporates a plug flow model. The beach slope model is validated using flume data from Chuquicamata, Sunrise Dam and Peak Gold Mine, as well as a range of full scale beach data from some 29 real tailings beaches. It has been found that reasonably accurate predictions are achieved.

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Realistic beach slope prediction and design

Cited by 12 publications

References 5 publications

Stochastic modelling of beach profiles including the influence of thickener performance

Stochastic modelling of beach profiles including the influence of thickener performance

Paste and thickened tailings – myth busting and clarification

A tailings beach slope model featuring plug flow

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