Factors Influencing Stope Hanging Wall Stability and Ore Dilution in Narrow-Vein Deposits: Part 1

Abdellah, Wael R.; Hefni, Mohammed A.; Ahmed, Haitham M.

doi:10.1007/s10706-019-01102-w

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…Moreover, it analyzes the sequences of mining methods according to the desired backfill. Currently, several research works use numerical modeling as a means of stability analysis in the mining industry context, such as [13]- [17]. Generally, the most used criteria for a geotechnical analysis evaluation are major principal stress, minor principal stress, and safety factor.…”

Section: Figure 2 Cross-section Represents the Cobalt Ore Vein With I...mentioning

confidence: 99%

Geotechnical modeling of the method for mining cobalt deposits at the Bou Azzer Mine, Morocco

Driouch¹,

Ouadif²,

Lahmili³

et al. 2023

Min. miner. depos.

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Purpose. The Bou Azzer Mine encounters difficulties during cobalt mining. In order to select the optimal mining sequence with the least geotechnical stability problems, one possible variant is the cut and backfill mining method used in the Bou Azzer East area at a depth of 540 m. Methods. This paper presents a methodology for selecting a sequence of the cut and backfill mining method using 2D geotechnical numerical modeling, taking into account the morphological characteristics, geomechanical properties of the ore and the surrounding rocks. Findings. The sequences of mining with rock backfill and rock-cemented backfill show that the high principal stress (Sigma 1) is in the range of 10-153 MPa, and the safety factors are in the range of 0.63-1.89. Therefore, mining sequences with cemented backfill and under cemented backfill have a principal stress (Sigma 1) in the range of 10-112 MPa and acceptable safety factors. Originality. In this study, the bottom-up mining sequence with a cemented backfill is proposed for the case of low-quality serpentine footwall. This mining sequence aims to achieve good cobalt mine production and provides a safe environment for miners. Practical implications. In the mining industry, the choice of mining method using 2D or 3D geotechnical numerical mo-deling is important to ensure the safest and most operational mining sequence in the mine lifetime.

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Section: Figure 2 Cross-section Represents the Cobalt Ore Vein With I...mentioning

confidence: 99%

Geotechnical modeling of the method for mining cobalt deposits at the Bou Azzer Mine, Morocco

Driouch¹,

Ouadif²,

Lahmili³

et al. 2023

Min. miner. depos.

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“…In this step of analysis, we will have analyzed the deformation and the extent of the unstable zone around the excavation to determine the optimum height of the design mine. The deformation will be represented by the total maximum displacement, while the extent of the unstable zone indicates the depth of the unstable zones, which have a safety factor less than 1 (SF < 1), this value is fixed at 1 view that the Mine openings are considered temporary openings [44]. This analysis will be done for different cases of the stress factor ratios K (K = 1, 1.5, 2).…”

Section: Effect Of the Height Of The Stopementioning

confidence: 99%

Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

Ghazdali¹,

Moustadraf²,

Tagma³

et al. 2021

Min. miner. depos.

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Purpose.This article proposes to analyze and determine the mining design for shallow-dip deposits hosted in poor quality rock. Methods. We used the UBC tool to find the optimal exploitation method, the Rock mass rating (RMR) and Q-system (Q) to determine the optimal mining stope and the recommended rock support, the numerical modeling by RS2 software with a variety of geotechnical, geometrical, and technical conditions to analyze the evolution of the unstable zone width and the maximum total displacement around the stope after excavation. Findings. The optimum mining method designated by the UBC tool for this type of deposit is the cut and fill. By projecting the obtained RMR and Q-system values on the design graph, it is concluded that the operating stope is located in the stable zone with a height of 3 m, and bolting support is recommended. The simulation by RS2 software reveals that the optimal mining design that can be used to mine shallow-dip vein deposits hosted in poor quality rocks consists of a 3 m high stope and a 75° dip with cemented backfill. Originality.This work presents a study to choose the most suitable underground mining method and mine design for shallow-dip deposits hosted in poor quality rock. Practical implications.In the mining industry, the success of operating an underground mine is conditioned by the selection of the appropriate method, of the mining design and dimensioning of a rock support adapted to the nature of the rock, and excavation geometry according to the type and nature of the deposit.

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“…The safety aspect of ore extraction was established, both with an open space and with the backfilling of the goaf [24][25][26]. The resistance of the rock mass to the clogging of the ore mass [14,27] and the possibility of adjusting the technological parameters of the mining systems were established [28,29].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Interaction of Backfill Mixtures with Natural Rock Fractures within the Zone of Their Intense Manifestation while Developing Steep Ore Deposits

et al. 2023

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Mining systems for ore deposit extraction with the backfilling of the goaf solve the problem of preserving the surface and the complete extraction of rich ores. This paper considers the filling of mined-out stopes with a viscous fluidal solution for the formation of an artificial strong massif, which results in a conglomerate formed on contact with the ore deposit. It was established that exogenous fracturing at the Pivdenno-Belozirske deposit significantly affects the stability of the sides and ceilings in the chamber. This phenomenon can be observed at the first stage of processing. At chambers (the second stage of processing), the artificial rock mass is exposed. It has been established that the chamber mining systems do not ensure the operational stability of the vertical outcrop in the zones of exogenous intensive fracture of the rock mass, especially in the places where they intersect. The zonal location of intense fracture was established along the strike and dip of the steep ore deposit, as was its importance in the formation of rock fallouts. An analytical solution algorithm has been developed to determine the penetration of the backfilling mixture in the plane of the intersection of zones of intense cracking, with opposite azimuths of incidence at steep angles of macrocracking. The features of penetration into microcracks of the backfilling mixture used at the mine, which are affected by their granulometric and physicochemical compositions, have been determined. The influence of the height of the layer and the procedure of backfilling the chamber space in the liquid phase on the formation of the necessary pressure for the opening of a microcrack was studied. The priority of backfilling the exogenous macrocracks with significant gaps and those between tectonic blocks with mixtures has been analytically substantiated and confirmed by experimental methods of research in the mine.

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Factors Influencing Stope Hanging Wall Stability and Ore Dilution in Narrow-Vein Deposits: Part 1

Cited by 15 publications

References 8 publications

Geotechnical modeling of the method for mining cobalt deposits at the Bou Azzer Mine, Morocco

Geotechnical modeling of the method for mining cobalt deposits at the Bou Azzer Mine, Morocco

Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

Mechanism of Interaction of Backfill Mixtures with Natural Rock Fractures within the Zone of Their Intense Manifestation while Developing Steep Ore Deposits

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