Estimating the Optimal Overall Slope Angle of Open-Pit Mines with Probabilistic Analysis

Abdellah, Wael R.; Hirohama, Chiaki; Sainoki, Atsushi; Towfeek, Ahmed Rushdy; Ali, Mohamed S.

doi:10.3390/app12094746

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…Abdellah et al [13] demonstrated a method capable of selecting the optimal general slope angle of open-pit mines according to the following parameters: safety, productivity and mine costs. The results demonstrate increasing profitability and decreasing stripping ratio cost as the overall slope angle becomes steeper.…”

Section: /7mentioning

confidence: 99%

Methodology to include the comminution specific energy into open-pit strategy mine planning using global optimization

Mata¹,

Nader²,

Mazzinghy³

2022

Tecnol. Metal. Mater. Min.

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Strategic Mine Planning demands an accurate knowledge of the mineral deposit, being very important the use of block models supported by Geometallurgy. Currently, the methodology used considers the mine planning divided into parts (ultimate open pit, pushbacks, scheduling). Global optimization can guarantee the optimal solution once all steps are solved together. In the present study the database Marvin was used and the geometallurgical variable comminution specific energy was included. In the first scenario, called GeoMet1, a ramp-up was included in the first three years. In the GeoMet2, different maximum movement ranges were defined, as well as the implementation of ore stockpiles and their subsequent rehandling. Gains of 9.66% in NPV and 5.18% in ore production were found for GeoMet2. The second scenario presented ore production adhering to the programmed, in addition to greater stability in the stripping ratio. In addition, GeoMet2 was more efficient in controlling the comminution specific energy. Therefore, the implementation of mass movement limitations allied to the use of stockpiles favored the optimization of the mine scheduling results. It was possible to verify the importance of including the variable comminution specific energy in the block model, to provide more realistic and reliable results.

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Section: /7mentioning

confidence: 99%

Methodology to include the comminution specific energy into open-pit strategy mine planning using global optimization

Mata¹,

Nader²,

Mazzinghy³

2022

Tecnol. Metal. Mater. Min.

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“…In open-pit mines, rock instability is a major concern, and its failure has negative consequences on the economy and safety of personnel and equipment [4].…”

Section: Introductionmentioning

confidence: 99%

Slope Stability Analysis: Case of the West Wall of the EMZ Pit at the Essakane Gold Mine in Burkina Faso (West Africa)

Yonli,

Lompo,

Kagambega

et al. 2023

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Knowledge of the state of stability of mining pits is both a basic condition, an essential axis and a safety benchmark for mining operations. This stability is largely based on the knowledge of the rock mass sheltering the mining works and this requires a perfect characterization of all of its structural formations through mapping (manual or digital). The families of discontinuities, namely family 1 (bedding), family 2 (Joint 2) and family 3 (Joint 1) obtained through structural mapping in the Essakane open pit mine, made it possible to analyze the failure modes at the origin of rock instabilities. The respective dips of these different directional families are: 77˚ -85˚/N 058˚ -068˚, 66˚ -74˚/N 133˚ -143˚, 25˚ -35˚/N115˚ -130˚. An average safety factor of 4.3 was estimated for the area with a quality of the rock mass (RMR) estimated at 47. The results obtained reflect on the one hand the risks of instability associated with the quality of the rock mass studied and on the other hand highlights the state of stability of the study area.

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“…The determination of the optimal slope angle, ensuring the stability of the mining pit is a crucial step during the exploita tion of the deposits because this angle has a double influence: 1) safety: an edge angle being too high can become a bank de formation factor, resulting slippage on the mine edges and causing unpleasant damage; 2) economical: in very deep mines, a change in the slope angle by a few degrees leads to a change in the stripping volumes, amounting to millions of cu bic meters, which influences the project's profitability [2,6].…”

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confidence: 99%

A new mining method for reopening the opencast mine of Kef Essennoun

Mezam,

Bachar Assed,

Ould Hamou

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. To treat the stability problem of the phosphate Kef Essennoun quarry in the mining field of Jebel Onk located in the Northeastern part of Algeria. Methodology. To achieve these objectives, we started by monitoring the unstable area, using two monitoring systems: control stations and inclinometer. We then carried out a digital assessment of the Northwestern edge stability of the quarry under the current operating conditions of exploitation. After that, we proposed a new operating plan for the reopening of the depot under the required security conditions. At the end, we carried out an assessment of the edge stability, as the work to reopen and develop the Kef Essennoun quarry progressed. Findings. The results show that, under the current operating conditions of exploitation, the Northwestern edge of the Kef Essennoun quarry is unstable (FS < 1). The backfilling of the pilot pit of the mine, lead to the assurance of the mine walls stability, by increasing the values of safety factors with a rate of more than 30 %. Originality. The backfilling of the pilot pit of the mine and the resumption of top-down mining exploitation will ensure the stability of the quarry during and after the operating exploitation mining. Practical value. The study of the stability of the embankments bleachers, the edges of the quarries and the facings of the slag heaps during the open pit mining of useful ores deposits is an essential step that must be done gradually according to the development of mining works to guarantee the safety of personnel, materials, reserves and the environment.

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Estimating the Optimal Overall Slope Angle of Open-Pit Mines with Probabilistic Analysis

Cited by 7 publications

References 41 publications

Methodology to include the comminution specific energy into open-pit strategy mine planning using global optimization

Methodology to include the comminution specific energy into open-pit strategy mine planning using global optimization

Slope Stability Analysis: Case of the West Wall of the EMZ Pit at the Essakane Gold Mine in Burkina Faso (West Africa)

A new mining method for reopening the opencast mine of Kef Essennoun

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