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Sulfur isotopes in Archaean crustal reservoirs constrain the transport and deposition mechanisms of nickel-sulfides in komatiites Miner. Deposita (IF 4.8) Pub Date : 2024-03-16 Anne B. Virnes, Marco L. Fiorentini, Stefano Caruso, Kim Baublys, Quentin Masurel, Nicolas Thebaud
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The critical pressures for crack closure, crack reopening and crack instability in hydraulic fracturing Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-12 J, o, a, c, h, i, m, , H, e, i, e, r, l, i
Micro-hydraulic and packer-sleeve fracturing experiments are widely used in geological exploration. In these, a crack is initially formed, then expanded through the rock formation under study. A chief application of these techniques is the estimation of principal stresses in deep geological formations based on two observations: the critical pressure when the crack 'closes' after fluid injection is
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Two-phase flow visualization experiments in variable-aperture fractures: The correlation between flow structure, displacement efficiency and relative permeability Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-11 Xin Zhou, Jianlong Sheng, Zuyang Ye, Xiaoliang Yang
The correlation of flow structure, displacement efficiency and relative permeability for two-phase flow in variable-aperture fractures is critical for many fractured rock applications. A systematic visualization method for two-phase flow experiments was developed and four transparent variable-aperture fracture samples were duplicated by epoxy casting method. A total of 112 times two-phase flow experiments
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Dynamics of particle attachment in a model stirred cell: A new technique to characterize and quantify particle floatability Miner. Eng. (IF 4.8) Pub Date : 2024-03-10 Milad Eftekhari, Karin Schwarzenberger, Patrick Schlereth, Kerstin Eckert
Floatability evaluation is critical to predicting flotation results and designing a flotation flowsheet. Laboratory-scale flotation cells are commonly used to study particle floatability, but differences in cell design and governing hydrodynamics make extrapolation to industrial scale operations difficult. In this work, a new experimental approach based on particle attachment dynamics is proposed to
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Gravity separation of fine itabirite iron ore using the Reflux Classifier – Part II – Establishing the underpinning partition surface Miner. Eng. (IF 4.8) Pub Date : 2024-03-10 Armando F.d.V. Rodrigues, Homero Delboni Junior, James Zhou, Kevin P. Galvin
This work assessed the potential of a single stage Reflux Classifier to upgrade itabirite iron ore to high grade at satisfactory recovery. Part I reported on the detailed findings of the experimental program and the physical transport of the particles through the system. A key purpose of the present paper was to deduce the underlying partition surface from relatively basic feed information on the Fe
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Size effects on strength and deformability of artificially jointed hard rock Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-09 Manuel A. González-Fernández, Xian Estévez-Ventosa, Ignacio Pérez-Rey, Leandro R. Alejano, Hossein Masoumi
An extensive experimental study is presented including around 140 triaxial compressive strength tests on artificially jointed hard rock. The experiments were performed on cylindrical and jointed specimens with either 1 sub-vertical and 2 sub-horizontal (1 + 2) or 2 sub-vertical and 3-sub-horizontal (2 + 3) joint sets. The specimen diameter consisted of 38, 54 and 84 mm and the rock was Blanco Mera
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Trace element impurities in anode copper from Olympic Dam, South Australia Miner. Eng. (IF 4.8) Pub Date : 2024-03-09 Nigel J. Cook, Kathy Ehrig, Cristiana L. Ciobanu, Sarah E. Gilbert, Hassan Gezzaz
Anode copper is the intermediate product between copper smelting and electrorefining. Anodes are typically 98.5 to 99.8 % pure and require electrorefining to high-purity copper cathode that can be sold to customers. Impurity elements, including Ag, Au, As, Sb, Bi, Se, Te, Sn, Pb, Co, and Ni (alongside minor Fe, Al, and Si), are either dissolved within anode copper, or contained within micron-scale
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Experimental study on the effect of heating and liquid nitrogen-cooling cyclic treatment on mechanical properties and fracturing characteristics of granite Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-08 Yi Xue, Linchao Wang, Jia Liu, P.G. Ranjith, Feng Gao, Chengzheng Cai, Heping Xie
As an environmentally friendly anhydrous fracturing technology, liquid nitrogen (LN)-assisted refracturing can effectively improve fracture complexity and build Enhanced geothermal systems by repeatedly cooling the hot dry rock. In this study, multiple heating and LN-cooling cyclic tests were conducted on granite samples to evaluate the impact of LN cooling on the mechanical properties of granite.
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Numerical modeling of hydraulic stimulation of fractured crystalline rock at the bedretto underground laboratory for geosciences and geoenergies Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-08 Iman Vaezi, Andrés Alcolea, Peter Meier, Francesco Parisio, Jesus Carrera, Víctor Vilarrasa
Hydraulic stimulation of Enhanced Geothermal Systems (EGS) aims at boosting permeability to facilitate fluid circulation, while keeping a low induced seismicity. However, some stimulations have led to poor permeability enhancement or too high induced earthquakes, which suggests that further understanding is needed on poromechanical processes during stimulation. Here, we model a highly-monitored test
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Pyrolysis liquid of pine wood: A novel efficient depressant of pyrite in galena flotation Miner. Eng. (IF 4.8) Pub Date : 2024-03-08 Zuchao Pan, Can Cai, Guoyan Liang, Fen Jiao, Congren Yang, Qian Wei, Wenqing Qin
The pyrolysis liquid of pine (PL) had a significant depression effect on pyrite, but its effect on galena was minimal. Within the pH range of 8.0–10.0, the recovery of pyrite was below 10 % upon the addition of 200 mg/L PL, whereas that of galena remained above 90 %. XPS analysis showed that the main functional groups adsorbed on the pyrite surface were C–OH and CO. TOF-SIMS analysis showed that substances
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Effect of nutrient concentration, dissolved salts, and mineralogy at high temperature column bioleaching of a pyrrhotite-pyrite secondary ore Miner. Eng. (IF 4.8) Pub Date : 2024-03-08 Carmen Falagán, David W. Dew, Karen A. Hudson-Edwards
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Recovery of oxalic acid from hydrochloric acid and cobalt containing hydrometallurgical side-stream by solvent extraction Miner. Eng. (IF 4.8) Pub Date : 2024-03-08 Reza Aref, Niklas Jantunen, Sami Virolainen
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Magma mixing and magmatic-to-hydrothermal fluid evolution revealed by chemical and boron isotopic signatures in tourmaline from the Zhunuo–Beimulang porphyry Cu-Mo deposits Miner. Deposita (IF 4.8) Pub Date : 2024-03-06 Youye Zheng, Xin Chen, Martin R. Palmer, Kuidong Zhao, David Hernández-Uribe, Shunbao Gao, Song Wu
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A new analytical model for stress distribution in the rock bolt under axial loading Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-07 D, a, n, q, i, , L, i
This study presents a novel analytical model to simulate the axial strain and stress distribution along the full embedment length of the grouted rock bolt under axial loading. The model is derived based on the force equilibrium equation at one infinitesimal section of the rock bolt to grout interface and solved using second order partial differential equation method. Such a model is advanced in a way
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Iron oxide–apatite deposits form from hydrosaline liquids exsolved from subvolcanic intrusions Miner. Deposita (IF 4.8) Pub Date : 2024-03-06
Abstract Iron oxide–apatite (IOA or Kiruna-type) deposits typically consist of a magnetite-apatite-actinolite/diopside assemblage and are spatially associated with extensive Na-(Ca) alteration and brecciation. The origin of these deposits is highly controversial and has been ascribed to the separation of iron-oxide/sulfate-(carbonate) melts, magnetite emulsions, or metasomatic replacement by aqueous
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Assessing the depression of high-concentration pyrite in copper flotation by high pH Miner. Eng. (IF 4.8) Pub Date : 2024-03-06 Richard Li Jie Lee, Yongjun Peng
Treating high-pyrite-containing ores has been problematic in copper flotation plants where selective separation of copper minerals from pyrite is challenging to achieve. Raising pulp pH is common for pyrite depression when pyrite feed grade is low. Whether raising pulp pH can equally depress pyrite in copper flotation when pyrite feed grade is high remains unanswered. Hence, this research examined
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Process mineralogy of unconventional mineral deposits examples of applications and challenges Miner. Eng. (IF 4.8) Pub Date : 2024-03-05 K, u, r, t, , A, a, s, l, y
Process mineralogy is an important field within the mining industry. It is widely known that the application of process mineralogy can be used to solve problems and challenges, and as a tool for optimization, in the mineral processing plant. The field also contributes to an increased value of ore concentrates produced. However, how can the knowledge from, and experience with process mineralogy be applied
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CFD simulation and water model experiments with overflow-type supergravity reactor set up for continuously removing inclusions from aluminum melt Miner. Eng. (IF 4.8) Pub Date : 2024-03-05 Zhe Wang, Qilong Wei, Meng Hu, Zhancheng Guo
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Experimental investigation into influence of surrounding rock on strainburst: Insight from failure process and energy partition Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-04 Binwen Ma, Heping Xie, Changtai Zhou, Hongwei Zhou, Feng Gao, Peiwang Cao, Jianbo Zhu
The strainburst is the most common type of rockbursts, which may cause injury and death to workers, ruin to underground engineering facilities and destruction to mining/civil infrastructures. However, it is still unknown how the energy released from the surrounding rock affects the strainburst. To explore the effect of the surrounding rock on the strainburst, uniaxial compression tests were carried
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Multi-source unsupervised domain adaptive mill load forecasting method based on deep learning and fusion features Miner. Eng. (IF 4.8) Pub Date : 2024-03-04 Yiwen Liu, Gaowei Yan, Rong Li, Shuyi Xiao, Mifeng Ren, Lan Cheng
In the grinding industry, accurate prediction of the mill load is the key to enhancing plant profitability and reducing mill failures. After the condition changes, the model is usually mismatched, and the true label cannot be obtained in time. To solve this problem, we propose a multi-source unsupervised domain adaptation model based on deep learning and fusion features (MUDA_DF), which is suitable
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Reverse toe sliding criteria of laterally confined low wall slope subjected to counterweight fill Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-02 Thirapong Pipatpongsa, Kun Fang, Cheowchan Leelasukseree, Apipat Chaiwan, Natthawat Chanwiset
A three-dimensional slope stability analysis is necessary when the effects of the lateral boundary and the toe support on the load transfer can substantially change the failure mode, between thrust collapse and reverse toe sliding. Both failure modes commonly occurred throughout southeast pit of the Mae Moh mine in Thailand where unfavorable geologic structures, consisting of reversely dip-slip faults
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Quantifying the degree of selectivity in a Flocculation-Flotation process of LiCoO2 and graphite using scanning electron microscopy and image processing analysis Miner. Eng. (IF 4.8) Pub Date : 2024-03-02 Tommi Rinne, Mohazzam Saeed, Rodrigo Serna-Guerrero
This research article studies selective flocculation as a means for improving flotation of lithium-ion battery active materials using mixtures of pure LiCoO (LCO) and graphite. Scanning electron microscopy (SEM) combined with image analysis via density-based spatial clustering of applications with noise (DBSCAN) is presented as a novel method to quantitatively determine the degree of selectivity in
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Improved azurite sulfurization with ethylenediamine modification and its effects on flotation behaviors: Insight from copper vacancy Miner. Eng. (IF 4.8) Pub Date : 2024-03-02 Jinpeng Cai, Xiaohua Yu, Chao Su, Bin Pei, Peilun Shen, Dianwen Liu
Enhanced sulfurization has always been the focus of flotation research on copper oxide minerals. In this study, ethylenediamine (EDA) was used to improve the sulfurization of azurite. ICP-OES, AFM, XPS, Zeta potential, EPR and DFT calculation were applied to reveal the underlying promoting mechanism, and flotation tests were conducted to evaluate the effect of EDA on sulfurization flotation of azurite
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Polyphase stratabound scheelite-ferberite mineralization at Mallnock, Eastern Alps, Austria Miner. Deposita (IF 4.8) Pub Date : 2024-02-28 Florian Altenberger, Joachim Krause, Niki E. Wintzer, Christoph Iglseder, Jasper Berndt, Kai Bachmann, Johann G. Raith
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Self-sealing of pre-cracked callovo-oxfordian claystone: Implications for geological disposal of nuclear waste Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-01 C. Wang, M. Briffaut, J. Talandier, F. Skoczylas
Self-sealing is a well-known property of mudrocks (clays, claystones and shales). In the context of geological disposal of nuclear waste, understanding the self-sealing mechanism and its efficiency is crucial for the repository safety assessment. This paper presents an experimental study on the pre-cracked Callovo-Oxfordian (COx) claystone to assess the effects of clay swelling and re-compaction on
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A true triaxial compression-induced microcracking model for evaluating short-term progressive and long-term creep failures of brittle rock Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-01 Xiaozhao Li, Lianjie Li, Chengzhi Qi
Deep underground surrounding rock is often in the true triaxial stress state. Therefore, it is of great practical importance to recognize the short-term stress-strain relationship of progressive failure and the long-term characteristics of creep failure for the design, construction and maintenance of underground engineering in the true triaxial stress state. This paper aims to propose a feasible theoretical
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Influences of water saturation and strain rate on the mechanical and failure behavior of sandstone under direct shear test with constant normal pressure Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-03-01 Tao Zhou, Xuehan Yin, Changtai Zhou, Pengfei Guo, Jian Zhou
Understanding the mechanical and failure behavior of rock subjected to dynamic shear load is essential for the scientific design and safe operation of rock engineering. To understand the coupled effect of water and strain rate on the mechanical and failure behavior of sandstone, direct shear tests with constant normal pressure were conducted on sandstone specimens under different water saturations
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Residual Dewatering Aids in Process Water on Flotation Performance of a Selected Cu-Ni-PGM Ore from a Siliceous Reef Miner. Eng. (IF 4.8) Pub Date : 2024-03-01 Malibongwe S. Manono, Saahil F. Khan, Lisa L. October, Kirsten C. Corin
The increasing scarcity of water has led to mine operations recycling water from tailing dams, thickener overflow, dewatering and filter products. However, water quality is found to influence the process of ore flotation, with adverse effects on flotation selectivity. The adsorption of the collector onto valuable minerals may also be affected by the unintended change on water chemistry. This study
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Size effect model with competing mechanism for quasi-brittle materials under uniaxial compression Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-29 Xiaoyu Liu, Huimei Zhang, Shenghu Luo
Although researchers have proposed various size effect models, it is still one of the most challenging problems in mechanics and materials science to establish a model that can capture different types of size effect trends. In this work, the size effect models of the maximum flaw and fracture process zone (FPZ) are defined and verified. Then, these models are incorporated into the fracture mechanics
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Field experimental verifications of 3D DDA and its applications to kinematic evolutions of rockfalls Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-29 Guoyang Liu, Zhirui Zhong, Ke Ma, Wu Bo, Penghui Zhao, Yexin Li, Zhenping Zhang, Peng Zhang
As a frequent occurring geomorphological process characterized by high energy and mobility, the rockfall movement is the basis of the disaster prediction and mitigation. In this study, the kinematic evolution behaviors of rockfalls are investigated using three-dimensional discontinuous deformation analysis (3D DDA) based on block kinematics. A series of field experiments are designed by orthogonal
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Insights into the ground response characteristics of shallow tunnels with large cross-section using different pre-supports Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-29 Zhenyu Sun, Dingli Zhang, Daoping Liu, Qimin Tai, Yanjuan Hou
The construction of shallow tunnels with large cross-sections is associated with safety issues during excavation and the presence of surface structures above the tunnel, particularly when the tunnel is excavated in a soft ground. A pre-support is considered a crucial stabilization technique for tunnels, as it performs the dual functions of face failure prevention and displacement control; however,
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Integrated multiple tracer-based tomographic inversion and heterogeneity characterization of karst limestone mining regions in southwest China Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-29 Xintong Wang, Zhenhao Xu, Zhaofeng Li, Dongdong Pan, Haiyan Li
Understanding the distribution of hydraulic parameters is essential for preventing water-related hazards in limestone mines. Tracer testing is a technique to elucidate the spatial heterogeneity of hydraulic parameters and transport properties within an aquifer. In order to estimate fluid flow characteristics and the distribution of hydrogeologic properties of the limestone aquifer, this study performed
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Importance of considering classification and liberation when optimising comminution and flotation Miner. Eng. (IF 4.8) Pub Date : 2024-02-29 K.C. Runge, J.J. Frausto, M.M. Lisso, V. Jokovic, M. Yahyaei
With the world demand for minerals accelerating, there is an increasing need to optimise grinding and flotation processes to maximise flotation recovery and minimise energy use. This paper aims to demonstrate that it is important to consider liberation in these optimisation studies. Classification is a key process linking grinding and flotation. This paper presents a series of case studies that compare
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Ash removal from inferior coal via ammonium fluoride roasting and simultaneous yield of white carbon black Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2024-02-28 Xuqin Duan, Shuaiyu Lu, Yuxiao Fu, Jiazhe Zhang, Tong Liu, Jian Ma
The quality upgrading and deashing of inferior coal by chemical method still faces great challenges. The dangers of strong acid, strong alkali, waste water and exhaust gas as well as high cost limit its industrial production. This paper systematically investigates the ash reduction and desilicification of two typical inferior coal utilizing ammonium fluoride roasting method. Under the optimal conditions
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Mechanical characterisation of the stones of Notre-Dame de Paris by in situ acoustic velocity measurement Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-28 Nathalie Domede, Thomas Parent, Colin Guenser, Ali Boukham, Pierre Morenon, Aboubacar Sadikou Issa-Ibrahim
The Notre-Dame de Paris cathedral was built in the 12th century with Lutetian limestone from several quarries in the Paris basin, and was renovated several times. The aim of the research presented here was to determine the mechanical parameters of these limestones and their variability over the entire structure. For this purpose, the authors performed non-destructive ultrasonic propagation velocity
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Impurities removal from acidic solution of nickel cobalt complex hydroxide using pulsed disc and doughnut column Miner. Eng. (IF 4.8) Pub Date : 2024-02-28 Chi Wang, Boren Tan, Chenye Wang, Yong Wang, Peng Xing, Huiquan Li, Xiahui Gui, Jianguo Yang, Xue Guan
In this work, a 30 mm diameter pulsed disc and doughnut solvent extraction column was used for impurities removal from nickel cobalt complex hydroxide acid solution by solvent extraction. The effects of dispersed phase velocity, continuous phase velocity and pulse intensity on drop diameter, dispersed phase holdup and mass transfer were investigated. The results show that the drop size decreases gradually
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Transfer learning framework for multi-scale crack type classification with sparse microseismic networks Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2024-02-27 Arnold Yuxuan Xie, Bing Q. Li
Rock fracture mechanisms can be inferred from moment tensors (MT) inverted from microseismic events. However, MT can only be inverted for events whose waveforms are acquired across a network of sensors. This is limiting for underground mines where the microseismic stations often lack azimuthal coverage. Thus, there is a need for a method to invert fracture mechanisms using waveforms acquired by a sparse
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Investigation of gold-amino acid interactions using Fourier Transform Infrared spectroscopy and correlation with gold dissolution; Studies at different pH values Miner. Eng. (IF 4.8) Pub Date : 2024-02-27 Anthony Tapfuma, Guven Akdogan, Robert C. Luckay, Margreth Tadie
Recent developments in the field of gold leaching using amino acids have generated an interest in understanding the bonding/interactions involved in gold amino acid complexation. So far, only Density Function Theory (DFT) models have predicted the bonding of gold with amino acids, and there has been limited experimental work to verify the postulated quantum models. This study therefore aims to address
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Experimental study of the damage characteristics of rocks containing non-penetrating cracks under cyclic loading Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2024-02-26 Jun Xu, Xiaochun Xiao, Lu Ma, Sen Luo, Jiaxu Jin, Baijian Wu
The damage evolution process of non-penetrating cracks often causes some unexpected engineering disasters. Gypsum specimens containing non-penetrating crack(s) are used to study the damage evolution and characteristics under cyclic loading. The results show that under cyclic loading, the relationship between the number of non-penetrating crack(s) and the characteristic parameters (cyclic number, peak
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Impact of computer-controlled drill carriage's position deviation on automated hole positioning in underground roadways Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-26 Haojun Wu, Min Gong, Qing Zhao, Xiaodong Wu, Xiangyu Liu
When the drill and blast technique is used to excavate a roadway in underground coal mines, the relationship between the carriage and roadway space affects the automated hole positioning of a computer-controlled drill jumbo. This leads to low efficiency in hole positioning and high safety risks. This study analyzes the effects of deviations in carriage positioning, left-stacked stones, and inappropriate
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Effect of short- and long-term nonlinear behaviour on the thermoporomechanical pressurisation in COx claystone Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-26 M. Souley, M.-N. Vu, E.D. Coarita-Tintaya, G. Armand, F. Golfier
This study focuses on assessing the effect of short- and long-term nonlinear deformation (plasticity and creep) on the thermo-hydro-mechanical (THM) responses of Callovo-Oxfordian (COx) claystone, considered as the host formation for the geological radioactive waste disposal in France, if it is licensed. The temperature increase due to heat emitted from the waste package induces a pore pressure rise
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Crack system development in a heated rock with kerogen-filled pores Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-26 A.N. Galybin, S.E. Yakush
This paper deals with modelling of crack system formation in an initially impermeable rock with pores filled by solid kerogen upon its thermal treatment. Heating of the rock matrix results in the transformation of the kerogen particles into oil and gas, thus the pores become subject to internal pressure, which can initiate the development of cracks and formation of crack systems. Conditions at which
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Preliminary investigation into lithium extraction by phosphoric acid leaching of spodumene Miner. Eng. (IF 4.8) Pub Date : 2024-02-25 Justin Paris, Shiva Mohammadi-Jam, Ronghao Li, Jingyi Liang, Hak Jun Oh, Ozan Kökkılıç, Sidney Omelon, Kristian E. Waters
Lithium demand has risen significantly with the dominance of lithium-ion batteries in renewable energy technology. Spodumene is a primary lithium-bearing mineral of lithium extraction interest, due to its comparatively high grade and simple composition. However, lithium extraction processes from spodumene remain complex. In this study, phosphoric acid was investigated as a lithium leaching agent. Preliminary
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A multiscale poroelastic damage model for fracturing in permeable rocks Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-24 Jianxiong Yang, Jianfeng Liu, Wenfeng Li, Jingjing Dai, Fujun Xue, Xiaoying Zhuang
A new poroelastic damage model is developed in the paper to describe the macroscopic failure of rock materials due to microcrack nucleation and propagation based on a multiscale framework. The model is deduced from locally periodic microstructure with dynamically evolved microcracks in heterogeneous rock body. The homogenization method based on asymptotic expansions gives rise to the damage evolution
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On the role of poroelastic stressing and pore pressure diffusion in discrete fracture and fault system in triggering post-injection seismicity in enhanced geothermal systems Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-24 Iman R. Kivi, Victor Vilarrasa, Kwang-Il Kim, Hwajung Yoo, Ki-Bok Min
Injection-induced seismicity has become one of the most critical challenges for the widespread deployment of Enhanced Geothermal Systems (EGS). In particular, some EGS development projects have led to large, damaging earthquakes that unexpectedly occurred far off the stimulated reservoir region and, in particular, after stopping fluid injection. Yet, the causative mechanisms of these seismicity patterns
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Hydrocyclone separation enhancement of fine particles based on interface control Miner. Eng. (IF 4.8) Pub Date : 2024-02-24 Rui Wang, Ziang Zhang, Xiaokang Yan, Haijun Zhang, Lijun Wang
Hydrocyclones are devices that can efficiently separate and classify mixtures of multiphase systems based on density and grain size differences under centrifugal sedimentation. The cut size, denoted as , indicates the separation performance of the device, with lower values indicating higher separation limits. To reduce the cut size, researchers have tried different methods, such as modifying the hydrocyclone
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Estimation of the anisotropy of hydraulic conductivity through 3D fracture networks using the directional geological entropy Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2024-02-23 Chuangbing Zhou, Zuyang Ye, Chi Yao, Xincheng Fan, Feng Xiong
With an extension of the geological entropy concept in porous media, the approach called directional entrogram is applied to link hydraulic behavior to the anisotropy of the 3D fracture networks. A metric called directional entropic scale is used to measure the anisotropy of spatial order in different directions. Compared with the traditional connectivity indexes based on the statistics of fracture
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Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2024-02-23 Minzong Zheng, Shaojun Li, Zejie Feng, Huaisheng Xu, Yaxun Xiao
In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through in-situ stress tests remains unexplored. This study analyzes the three-dimensional stress changes
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In-situ deformation and fracturing characteristics of geomaterials under dynamic loading: Insights from ultra-high-speed X-ray phase contrast imaging and DEM modelling Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-23 H.C. Wang, K. Liu, B. Lukic, W.R. Hu, C.H. Braithwaite, J. Zhao, A. Rack, Q.B. Zhang
Dynamic loadings, such as earthquakes, blasts, and impacts, are commonly encountered in mining and underground infrastructures, and therefore predicting the failure of geomaterials, including cement, concrete and rock at high strain rates holds significant importance. The exploration of fracturing and deformation properties in materials under dynamic loadings is essential for comprehending the failure
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Prediction of strainburst risks based on the stiffness theory: Development and verification of a new rockburst indicator Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-23 Jun Wang, Derek B. Apel, Chong Wei, Huawei Xu
Strainburst is an unstable rock failure phenomenon that occurs at deep excavations' boundaries due to the excavation-induced stress concentration and a “soft” loading environment. A critical task for researchers is to predict the possibility or risk of strainburst occurrence. In this paper, the local mine stiffness (LMS) of a tunnel determined by a novel calculation method is compared to the post-peak
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Evaluation of the Crago flotation process to recover the iron contained in the fine tailings of Mont-Wright mine Miner. Eng. (IF 4.8) Pub Date : 2024-02-23 J. Mesquita, Y. Foucaud, H. Turrer, M. Badawi
Mont-Wright mine is an important asset of ArcelorMittal located in the province of Quebec, Canada. This asset annually produces 25 million tons of iron ore concentrate with an assay of 66 % Fe, achieved through a beneficiation circuit comprised entirely of spiral concentrators. Nevertheless, 45 million tons of tailings are discarded to the tailings dam and, due to the intrinsic inefficiency of the
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Effect of an electro-assisted biochemical cycle reactor on bio-oxidation of gold ore Miner. Eng. (IF 4.8) Pub Date : 2024-02-23 Tongyi Yang, Miaomiao Dai, Guoteng Tang, Zechong Guo, Yixuan Yang, Huazhe Jiao
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Study of cutting forces acting on a disc cutter and impact of variable penetration measured by full scale linear cutting tests Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-22 Muthu Vinayak Thyagarajan, Jamal Rostami
Designing the cutterhead of mechanized rock excavation systems and prediction of machine performance for these units often requires reliable estimation of cutting forces. The magnitude and variability of cutting forces depend on the rock and cutter type, as well as geometrical parameters in cutting such as spacing between the cuts, and depth of penetration. In most application, various components of
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The discrete fracture process zone of shale on micrometer scale Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-22 Min Zhang, Guangqing Zhang, Lei Chen, Wei Sun
In the shale formations stimulated by hydraulic fracturing, the development of micro-fractures invariably results in macro-fracture propagation and connects nano pore spaces, whose characteristics defined as a fracture process zone (FPZ) previously considered to be a crack zone ahead of a fracture, dominate fracturing process. However, there is still a lack of understanding of how micro-cracks nucleate
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Determination of the stress tensor of a triaxial strain cell in a three-layer model using the genetic algorithm and support vector machine Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-22 Minzong Zheng, Shaojun Li, Zejie Feng, Liu Liu, Wei Jia
The accurate acquisition of the stress state plays an important role in engineering practice. The over-coring stress relief method calculates stress tensor by measuring strain with a triaxial strain cell. However, the current analytical solution of stress calculation is based on the two-layer model, which cannot calculate cases involving three-layer media. Based on the genetic algorithm (Ga) and support
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The influence of backfilling of a caved zone and magma intrusion-type faults on surface deformation in a metal mine caused by sublevel caving mining Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2024-02-22 Kai Ma, Yong Zhao, Tianhong Yang, Rongxing He, Junxu Hou, Yilong Liu, Honglei Liu, Qingshan Ma, Wei Zhang
Based on monitoring data and engineering geological conditions, the surface deformation patterns caused by sublevel caving mining in the Dahongshan iron mine were analyzed. By interpreting the four stages of development of the surface fractured zone, namely, the formation, full unilateral development, asymmetric expansion and backfilling of the caved zone, it was found that the magma intrusion-type
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Environmental impacts of lithium hydroxide monohydrate production from spodumene concentrate – A simulation-based life cycle assessment Miner. Eng. (IF 4.8) Pub Date : 2024-02-22 Heikki Lappalainen, Marja Rinne, Heini Elomaa, Jari Aromaa, Mari Lundström
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Investigating the reprocessing potential of abandoned zinc-lead tailings ponds: A comprehensive study using physicochemical, mineralogical, and 3D geometallurgical assessments Miner. Eng. (IF 4.8) Pub Date : 2024-02-22 Ayoub El Aallaoui, Mustapha El Ghorfi, Abdellatif Elghali, Yassine Taha, Hamza Zine, Mostafa Benzaazoua, Rachid Hakkou
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Osmium and zinc isotope constraints on the origin of chromitites from the Yarlung-Zangbo ophiolites, Tibet, China Miner. Deposita (IF 4.8) Pub Date : 2024-02-20 Dongyang Lian, Fei Liu, Pengjie Cai, Weiwei Wu, Jie Li, Jarosław Majka, Zhiqin Xu, Jingsui Yang
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Application of a new self-consistent-charge density-functional tight-binding(SCC-DFTB) parameter set for simulating the adsorption of flotation reagents on the surface of typical lead minerals Miner. Eng. (IF 4.8) Pub Date : 2024-02-21 Yibing Zhang, Jianhua Chen, Yuqiong Li, Cuihua Zhao, Ye Chen