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Analytical Modeling of a Synthetic VMS Deposit Data: a Proxy Tool for Education and Initial Research Min. Metall. Explor. Pub Date : 2021-01-14 Viktor Lishchuk, Elena Haller, Olof Martinsson, Tobias E Bauer
Freely accessible and non-confidential real-life geological data sets from mineral deposits are desirable for the wide range of applications in research and education. However, publicly available statistical data are limited in their number and quality—they contain reduced information about geological, geophysical, geotechnical, chemical, mineralogical, and other relevant properties of deposits. This
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Cementation of Copper on Zinc in Agitated Vessels Equipped with Perforated Baffles as Turbulence Promoters Min. Metall. Explor. Pub Date : 2021-01-12 B. S. Ibrahim, M. H. Abdel-Aziz, E-S. Z. El-Ashtoukhy, T. M. Zewail, A. A. Zatout, G. H. Sedahmed
In this work, the possibility of intensifying the cementation process in stirred vessels was studied by using the perforated baffles as turbulence promoters; the cementation reaction of Cu+2 on Zn was selected as a model. Zn was used in the form of a sheet lining the inner wall of an agitated vessel. Parameters considered are initial concentration of Cu+2, solution temperature, impeller rotation speed
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Strata Stability Investigation and Convergence Monitoring (SSICM) in Thick-Seam Depillaring with Caving by Cable Bolting Method Min. Metall. Explor. Pub Date : 2021-01-12 Aveek Mangal
The study describes the strata mechanics and convergence monitoring while depillaring in a single lift of thick coal seam by cable bolting method. Based on the rock mechanical investigation, the use of a 19-mm diameter rope as support was applied to hold the immediate roof over the coal seam. The field application was carried out in Bonbohal (R-VI) seam of the case study mine for the extraction of
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Optimization Process of the Refractory Gold Ore Extraction by Hypochlorite Oxidative Leaching Min. Metall. Explor. Pub Date : 2021-01-08 Wan Nur Syafiqah Anuar, Mohammad Rezaei Ardani, Norlia Baharun, Suhaina Ismail, Shaik Abdul Rahman
Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of gold extraction from refractory gold ore. The studied parameters
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Exploring the Differences in Safety Climate Among Mining Sectors Min. Metall. Explor. Pub Date : 2021-01-07 Emily J. Haas, Patrick L. Yorio
Currently, the US mining industry is encouraged, but not required to adopt a formal health and safety management system. Previous research has shown that the adoption of such systems has been more difficult in some subsectors of the mining industry than others. Given the interdependencies between management systems and safety climate in addition to their predictive utility of incidents, it is important
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Effect of Surface Deposition Coating with Aluminum Hydroxide on the Stabilization of Iron–Arsenic Precipitates Min. Metall. Explor. Pub Date : 2021-01-07 Yongliang Wang, Xiang Liu, Jingmin Yan, Peiwei Han, Yingchao Du, Shufeng Ye
Iron–arsenic coprecipitate is a kind of solid waste produced in the treatment of arsenic-bearing wastewater from non-ferrous metallurgy. Stability of amorphous coprecipitates is usually poor if the Fe/As ratio is lower. In this study, the surface of coprecipitates was deposited with aluminum hydroxide with the aim to prevent the release of arsenic. The deposition experiments were carried out at normal
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Moderate Cover Bleeder Entry and Standing Support Performance in a Longwall Mine: a Case Study Min. Metall. Explor. Pub Date : 2021-01-07 Mark Alexander Van Dyke, Ted M. Klemetti, Ihsan Berk Tulu, Deniz Tuncay
Bleeder entries are critically important to longwall mining for the moving of supplies, personnel, and the dilution of mine air contaminants. By design, these entries must stay open for many years for ventilation. Standing supports in moderate cover bleeder entries were observed, numerically modeled, and instrumented by researchers at the National Institute for Occupational Safety and Health (NIOSH)
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Controlling Crosscut Damage in Response to Excessive Levels of Horizontal Stress: Case Study at the Subtropolis Mine, Petersburg, OH Min. Metall. Explor. Pub Date : 2021-01-07 Nicole Evanek, Anthony Iannacchione, Tim Miller
The Subtropolis Mine is a room-and-pillar mine extracting the Vanport limestone near Petersburg, Ohio, at a depth of approximately 59.4 m (190 ft). In February of 2018, mine management began implementing a new layout to better control the negative effects of excessive levels of horizontal stress. Almost immediately, the conditions in the headings improved. Conversely, and as expected, stress-related
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Study of the Textural Changes in the Nowshera (Pakistan) Ca-Bentonite Caused by the Physical Purification Before and After NaCl Treatment Min. Metall. Explor. Pub Date : 2021-01-07 Liaqat Ali Shah, Muhammad Farooq, Zait Ullah Shah, Francisco Rolando Valenzuela-Díaz
Bentonite collected from Nowshera (Pakistan) was treated with NaCl, and the < 2-μm clay fractions were separated by sedimentation process. The textural changes in NaCl treated purified bentonite were compared with raw and physically purified sample. It was detected that the NaCl-treated purified bentonite and the sample purified by simple sedimentation, respectively, consist of sodium-montmorillonite
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Capability of the Airstream Helmet for Protecting Mine Workers from Diesel Particulate Matter Min. Metall. Explor. Pub Date : 2021-01-06 J. Noll, T. Lee, S. Vanderslice, T. Barone
Diesel particulate matter (DPM) is considered carcinogenic to humans by the International Agency for Research on Cancer (IARC), and mine workers have some of the highest exposures to DPM in the USA. Therefore, mines have been developing control strategies for reducing DPM exposures of mine workers. Many of these strategies include engineering and administrative controls. In addition to these types
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Using LSTM and ARIMA to Simulate and Predict Limestone Price Variations Min. Metall. Explor. Pub Date : 2021-01-06 Tawum Juvert Mbah, Haiwang Ye, Jianhua Zhang, Mei Long
There have been many improvements and advancements in the application of neural networks in the mining industry. In this study, two advanced deep learning neural networks called recurrent neural network (RNN) and autoregressive integrated moving average (ARIMA) were implemented in the simulation and prediction of limestone price variation. The RNN uses long short-term memory layers (LSTM), dropout
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Empirical Approach Based Estimation of Charge Factor and Dimensional Parameters in Underground Blasting Min. Metall. Explor. Pub Date : 2021-01-04 Vivek Kumar Himanshu, M. P. Roy, Ravi Shankar, A. K. Mishra, P. K. Singh
Blasting with the aim to reduce oversize boulders in underground has many hurdles due to limited accessibilities and poor site conditions. Optimized drilling and blasting parameters can help to achieve this objective. The major challenges of the blast designers lie within deciding blast geometry, namely drill hole diameter, burden, and spacing. The general approaches covered worldwide to determine
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Correction to: Identifying Risk Factors from MSHA Accidents and Injury Data Using Logistic Regression Min. Metall. Explor. Pub Date : 2020-12-02 Richard Amoako, Judith Buaba, Andrea Brickey
A Correction to this paper has been published: https://doi.org/10.1007/s42461-020-00355-x
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Occurrence Modes of Niobium in Kaolin Clay From Guizhou, China Min. Metall. Explor. Pub Date : 2020-11-30 Li Zhu, Hannian Gu, Yongqiong Yang, Hanjie Wen, Shengjiang Du, Chongguang Luo, Ning Wang
Niobium in kaolin clay from the Late Permian sequences was reported in the range of several hundreds of micrograms per gram and was considered as a potential resource for its high concentrations and large areal distribution. Ti-bearing minerals associated with kaolin clay were identified as the main host phase for niobium in some case studies. However, the correlation between the concentration of niobium
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Relationship Between Capillary Water Absorption Value, Capillary Water Absorption Speed, and Capillary Rise Height in Pyroclastic Rocks Min. Metall. Explor. Pub Date : 2020-11-30 İsmail İnce
The existence of water is one of the most effective factors in deterioration of natural building stones. In the process of deterioration, capillary water absorption is the most significant procedure of water penetration into the building stones. Pyroclastic rocks have been widely utilized as building stone especially in historical buildings and monuments since ancient times in the Central Anatolia
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Fracture Pattern of Overlying Strata in Multiple Coal Seam Mining in a Physical Model Vis-à-vis MATLAB Analysis and Geological Radar Min. Metall. Explor. Pub Date : 2020-11-24 Chunlei Zhang, Yong Zhang, Jianping Zuo, Shouyang Gao
To study the fracture evolution of overlying strata for ascending mining in a short-distance coal seam group, a two-dimensional physical simulation model was designed based on a specific geological condition. The fracture development zone was divided into the compaction zone and active zone by monitoring and analyzing the macro fracture evolution of the surrounding rock mass during the excavation of
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Stability Mechanism and Control Technology for Fully Mechanized Caving Mining of Steeply Inclined Extra-Thick Seams with Variable Angles Min. Metall. Explor. Pub Date : 2020-11-23 Wang Hongwei, Wu Yongping, Jiao Jianqiang, Cao Peipei
Fully mechanized top caving mining of steeply inclined extra-thick seams with variable angles has complex roof rock movement, failure, caving, and filling mechanisms. Moreover, the variable-angle coal seams make rock–equipment stability control challenging. We analyzed rock deformation and failure mechanisms, overburden bearing structures, and working characteristics of supports through physical simulations
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Cable Disc Elevator: Static Friction Investigation Min. Metall. Explor. Pub Date : 2020-11-19 C. Webb, M. A. Tuck
This paper describes the application of a cable disc elevator to continuous lift ore vertically from underground mines. Application of this system requires the tensions developed within the cable must remain within the carrying capacity of the cable including applicable safety margins. A critical element occurs at starting the system when it is fully loaded which requires the force developed by the
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An Algorithm for Evaluation of Mining Cycle Parameters and Analysis of Periodic Roof Weighting Using Monitored Longwall Shield Pressures and Shearer Location Min. Metall. Explor. Pub Date : 2020-11-19 V. N. S. Prasad.M, Debasis Deb, Anand Kumar, A. K. Mishra
Shield leg pressure data from all shields and shearer location with time stamp from a mechanized longwall face are monitored and recorded in a surface computer. These data contain random noise due to power failure, leakage of legs, bad sensor reading and other maintenance or geo-mechanical problems. An algorithm is developed to detect mining cycle parameters such as setting and final pressures and
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Analysis of Mine Roof Support (AMRS) for US Coal Mines Min. Metall. Explor. Pub Date : 2020-09-29 Christopher Mark, Ryan C. Stephan, Zach Agioutantis
During the past 15 years, roof fall rates have fallen dramatically in US coal mines, particularly in regions where the roof is weakest. The remarkable reduction in the number of roof falls has been accomplished with more effective roof support systems. The purpose of this paper is to present a design methodology that builds on and quantifies the basic roof support concepts that have been successful
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Designing, Modeling, and Laboratory Testing of a Non-clogging Impingement Type Filter for Mining Dust Scrubbers Min. Metall. Explor. Pub Date : 2020-09-19 Ashish Ranjan Kumar, Steven Schafrik, Oscar Velasquez
Flooded-bed dust scrubbers installed on continuous miners use fibrous type multi-layered filters to capture dust from the airstream. Prolonged operations of the scrubber could lead to filter clogging due to dust accumulation. This results in reduced flow through the scrubber and elevated dust levels in the mine environment. This paper compares the performance of a conventional fibrous screen filter
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Haul Road Monitoring in Open Pit Mines Using Unmanned Aerial Vehicles: a Case Study at Bald Mountain Mine Site Min. Metall. Explor. Pub Date : 2020-09-15 Filip Medinac, Thomas Bamford, Matthew Hart, Michal Kowalczyk, Kamran Esmaeili
Improved haul road conditions can positively impact mine operations resulting in increased safety, productivity gains, increased tire life, and lower maintenance costs. For these reasons, a monitoring program is required to ensure the operational efficiency of the haul roads. Currently, at Bald Mountain mine, monthly site severity studies, ad hoc inspections by front-line supervisors, or operator feedback
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Correction to: Quick-Erect Stopping System for Radiation Protection and Mine Rescue in Small-Scale Mining Min. Metall. Explor. Pub Date : 2020-11-11 Jörg Dehnert, Jens Stopp, Peter Windisch, Bernd Schönherrt
In the original article Figs. 4 and 5 were transposed. The original article has been revised and the figures are now correct.
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An Analytical Approach to Measure the Probable Overlapping of Holes Due to Scattering in Initiation System and Its Effect on Blast-Induced Ground Vibration in Surface Mines Min. Metall. Explor. Pub Date : 2020-11-10 Hemant Agrawal, Arvind Kumar Mishra
Rock breakage using blasting is one of the important operations of the mining industry. The delay timing decides the initiation sequence of holes in the blasts and is a crucial factor to improve the overall blast performance. Blast-induced ground vibration is an undesired yet unavoidable outcome of blasting. Peak particle velocity (PPV) is commonly used to measure the magnitude of blast-induced ground
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Thermal Runaway Pressures of Iron Phosphate Lithium-Ion Cells as a Function of Free Space Within Sealed Enclosures Min. Metall. Explor. Pub Date : 2020-11-06 Thomas H. Dubaniewicz, Isaac Zlochower, Teresa Barone, Richard Thomas, Liming Yuan
Mining vehicle manufacturers are developing lithium-ion (Li-ion) battery electric vehicles as an alternative to diesel-powered vehicles. In gassy underground mines, explosion-proof (XP) enclosures are commonly used to enclose electrical ignition sources to prevent propagation of an internal methane (CH4) air explosion to a surrounding explosive atmosphere. Li-ion batteries can create pressurized explosions
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Identifying Risk Factors from MSHA Accidents and Injury Data Using Logistic Regression Min. Metall. Explor. Pub Date : 2020-11-03 Richard Amoako, Judith Buaba, Andrea Brickey
The global mining industry has recorded significant declines in accident and injury rates attributed to the advancement in technology, increased enforcement, and safety consciousness. A goal of the mining industry is to achieve zero injury and occupational illness on all mine sites, prompting increased research into ways to further reduce mine accidents. A machine learning technique known as multiclass
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Evaluation of Carbon Monoxide and Smoke Sensors at a Low Ventilation Velocity Min. Metall. Explor. Pub Date : 2020-11-02 James H. Rowland, Liming Yuan, Richard A. Thomas
This paper presents the results of large-scale fire experiments on evaluating the performances of carbon monoxide (CO) and smoke sensors at low ventilation velocities. Experiments using three different combustibles—conveyor belt, coal, and diesel fuel—were conducted in the Experimental Mine at the National Institute for Occupational Safety and Health (NIOSH) Bruceton Research Facility. A total of eight
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Analysis of Hydro-fracturing Technique Using Ultra-deep Boreholes for Coal Mining with Hard Roofs: a Case Study Min. Metall. Explor. Pub Date : 2020-11-02 Jianwei Zheng, Wenjun Ju, Xiaodong Sun, Pengfei Jiang, Yangfa Zheng, Zhaorui Ma, Lingfu Zhu, Bingding Yi
The presence of hard roof poses a significant threat to the safety of underground coal mining. In this study, a mechanical model is established for underground stopes to analyze the overburden structure with the advancing of the mining face. It is indicated that the load-bearing arch structure (LBAS) is formed above the stope for roofs with regular hardness, whereas the reversed-basin bearing structure
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A Laboratory Investigation of Underside Shield Sprays to Improve Dust Control of Longwall Water Spray Systems Min. Metall. Explor. Pub Date : 2020-11-02 S. S. Klima, W. R. Reed, J. S. Driscoll, A. L. Mazzella
Researchers at the National Institute for Occupational Safety and Health (NIOSH) performed laboratory testing to improve longwall dust control by examining the use of underside shield sprays in conjunction with the longwall directional spray system. In a field survey of longwall operations, NIOSH researchers observed dust clouds created by the fracturing and spalling of coal immediately upwind of the
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Separation and Recovery of Chromium from Solution After Vanadium Precipitation Min. Metall. Explor. Pub Date : 2020-10-30 Bin Hu, Bianfang Chen, Changda Zhang, Yanyang Dai, Mingyu Wang, Xuewen Wang
The separation and recovery of chromium from solution after vanadium precipitation were investigated by deep removal of vanadium, hydrolysis precipitation of chromium, and preparation of chromium oxide. Hydrous oxide of trivalent iron is an effective deep vanadium remover and can be recycled. Under the most suitable conditions including hydrous oxide of trivalent iron addition with a Fe/V molar ratio
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Design of the Otjikoto Gold Mill, Namibia Min. Metall. Explor. Pub Date : 2020-10-30 John Rajala
The Otjikoto Gold Mine in the Republic of Namibia is located approximately 300 kilometers north of the capital city of Windhoek. The project features surface mining with a modern gravity/carbon-in-pulp mill for ore treatment and recovery of gold. Initial mill design capacity was 2.5 million tonne per annum but then expanded after 9 months of operation to 3.1 million tonne per annum. The technical steps
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Preliminary Evaluation of Carbon Dioxide, Oxygen, and Hydrogen for Promoting Chromite Liberation by Breakage Min. Metall. Explor. Pub Date : 2020-10-29 Mahmut Camalan, Mehmet Ali Recai Önal
Mineral liberation is one of the primary objectives in comminution circuits for the downstream separation of valuable minerals. Breaking minerals through their grain boundaries (grain-boundary breakage) enables mineral liberation in their natural grain size, removing the need for intensive grinding. This study aimed to evaluate if gaseous carbon dioxide, oxygen, or hydrogen can be used as grinding
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The Effect of Particle Size Distribution and Liberation Degree on the Separation Performance of Industrial Spirals in Low-grade Chromite Processing Min. Metall. Explor. Pub Date : 2020-10-27 Ataallah Bahrami, Saghar Farajzadeh, Fatemeh Kazemi
Spirals, the most common equipment for the separation of heavy minerals such as chromite, are greatly affected by size distribution and the liberation degree (hence the specific gravity and size) of the feed particles. In this study, the efficiency of spirals in separation of low-grade chromite particles has been investigated by studying the distribution of grade, size distribution and liberation degree
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Investigation of Alumina-Based Ceramic Production from Aluminum Black Dross Min. Metall. Explor. Pub Date : 2020-10-26 Umay Cinarli, Ahmet Turan
High-energy consumption in primary aluminum production (from bauxite ores) makes secondary aluminum production (from metallic raw materials such as scrap and dross) very critical. Aluminum dross, as a waste, arises in pyrometallurgical processes, and it is the mixture of metallic Al, Al2O3, other metal oxides, metal halides, and some other compounds like AlN. Aluminum dross has two subgroups (white
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Optimization of Induration Cycle for Magnetite Concentrate and its Usage in Pellet-Making Process Designed for Hematite Concentrate Min. Metall. Explor. Pub Date : 2020-10-26 T. Umadevi, K. S. Sridhara, Sah Rameshwar
In the magnetite iron ore pelletization process, oxidation of magnetite followed by sintering of the oxidized magnetite (hematite) is desirable. Optimum preheating time & temperature and roasting time & temperature is required to get the desired properties of the pellets with magnetite, hematite, and hematite–magnetite blend. In order to utilize the magnetite resources in a current induration furnace
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Potential Application of Iron Oxide Nanoparticles Synthesized by Co-Precipitation Technology as a Coagulant for Water Treatment in Settling Tanks Min. Metall. Explor. Pub Date : 2020-10-26 Naeimeh Shabani, Afshin Javadi, Hoda Jafarizadeh-Malmiri, Hamid Mirzaie, Javid Sadeghi
Iron oxide nanoparticles (Fe3O4 NPs), despite their small size, are stable and have a large surface area that allows for absorption and removal of ions as well as turbidity in a short period of time. Thus, the present study addressed the synthesis and characterization of Fe3O4 NPs synthesized using the co-precipitation method and evaluated their effect on the coagulation process in water treatment
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Mapping of Gold Mineralization in Ichadih, North Singhbhum Mobile Belt, India Using Electrical Resistivity Tomography and Self-Potential Methods Min. Metall. Explor. Pub Date : 2020-10-26 Dharmita Horo, Sanjit Kumar Pal, Sahendra Singh
The North Singhbhum Mobile Belt (NSMB) lies between two crustal-scale shear zones, the South Purulia Shear Zone (SPSZ) at the north, and the Singhbhum Shear Zone (SSZ) at the south. The Babaikundi-Birgaon Axis (BBA) is an east-west trending secondary shear zone in the NSMB lying south of SPSZ, which is known for the occurrence of gold along with other sulfide minerals within the quartz reefs. The present
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Numerical Experimental Study on Ore Dilution in Sublevel Caving Mining Min. Metall. Explor. Pub Date : 2020-10-21 Kunpeng Yu, Chunshan Zheng, Fengyu Ren
On the basis of physical ore-drawing test research, the irregular particle clusters are constructed by adopting particle element theory and PFC numerical simulation software. Meanwhile, the ore dilution mechanism in the process of stoping caving ore and rock bulk is investigated, especially, the permeability characteristics of small size particles. Main factors considered in the numerical test are
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Integrated Geophysical Investigation for Shallow-Scale Massive (Pb-Zn) Sulphide and Barite Exploration in the Abakaliki and Obubra Mining Districts (AOMD), Southeastern Nigeria Min. Metall. Explor. Pub Date : 2020-10-20 Innocent John Arinze, Chidubem Okwudiri Emedo
This contribution presents the first multi-scale geophysical investigation conducted in the Abakaliki and Obubra mining districts (AOMD), southeastern Nigeria, for the exploration of shallowly emplaced (< 50 m) massive sulfide and barite mineral deposits. Raw airborne magnetic data covering the AOMD was acquired and subjected to diverse enhancement routines to facilitate the identification of areas
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Multi-Step Thermodynamic Calculation for Copper Dross Bath Smelting Process Min. Metall. Explor. Pub Date : 2020-10-19 Boyi Xie, Hui Xiao, Lin Chen, Weifeng Liu, Duchao Zhang, Tianzu Yang
The oxygen-rich bath smelting process of copper dross was simulated using Factsage software. It was found that the two-step simulation results agreed better with the industrial data, especially in the speiss. Bi, Pb, Sb, As, and Cu contents in the speiss by two-step simulation differed from the industrial data by 0.6 wt.%, 0.8 wt.%, 2.6 wt.%, 7.2 wt.%, and 8.6 wt.%, respectively. Two-step simulation
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Characterization of Bauxite Residue from a Press Filter System: Comparative Study and Challenges for Scandium Extraction Min. Metall. Explor. Pub Date : 2020-10-19 Amilton Barbosa Botelho Junior, Denise Crocce Romano Espinosa, Jorge Alberto Soares Tenório
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Characterization of Colemanite and Its Effect on Cold Compressive Strength and Swelling Index of Iron Ore Pellets Min. Metall. Explor. Pub Date : 2020-10-16 Mahaboob Basha Shaik, Chandra Sekhar, Srinivas Dwarapudi, Neha Gupta, Indrajit Paul, Arvind Kumar Patel, Shakuntala Tudu, Amit Kumar
In this study, the effect of colemanite and calcined colemanite (CC) addition on the properties of iron ore pellets is studied. The pellets are prepared in a lab without and with 0.2% colemanite and varying amounts of CC from 0 to 1.0 wt% in steps of 0.2%. A reference pellet is prepared under typical plant conditions, and the properties of the reference pellet are considered as the base value for improving
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Correction to: Exploration Methodology Using Morphology and Alloy Composition of Alluvial Gold: a Case Study from Quaternary Deposits of the Nowshera District, Khyber Pakhtunkhwa, Pakistan Min. Metall. Explor. Pub Date : 2020-10-15 Liaqat Ali, Robert Chapman, Muhammad Farhan, Mohammad Tahir Shah, Seema Anjum Khattak, Asghar Ali
In the original article the name of author Muhammad Farhan was misspelled.
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Field Testing of Roof Bolter Canopy Air Curtain Operating Downwind of the Continuous Miner Min. Metall. Explor. Pub Date : 2020-10-14 William R. Reed, Michael Shahan, Vasu Gangrade, Garron Ross, Kunal Singh, Todd Grounds
Roof bolter canopy air curtains (CACs) are gaining acceptance as a respirable dust control device that can provide roof bolter operators with protection from overexposure to respirable coal mine dust. Both lab and field studies on the effectiveness of roof bolter CACs have been published. Field studies have shown the effectiveness to be variable. However, in all previous field studies, none has been
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Mapping Surface Moisture of a Gold Heap Leach Pad at the El Gallo Mine Using a UAV and Thermal Imaging Min. Metall. Explor. Pub Date : 2020-10-12 Mingliang Tang, Kamran Esmaeili
An understanding of the spatial and temporal variations of surface moisture content over a heap leach pad (HLP) is essential for leaching production and to achieve a high ore recovery. The current practice of leach pad monitoring and data collection remains highly manual and labor-intensive, and exposes technical staff to hazardous material (i.e., cyanide solution). To address these challenges, we
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Platinum Recovery from Hydrometallurgical Residue of Waste Automotive Catalysts Processing by High-Temperature Smelting Process Min. Metall. Explor. Pub Date : 2020-10-12 Chuan Liu, Shuchen Sun, Xiaoping Zhu, Ganfeng Tu
The hydrometallurgical residue generated during the hydrometallurgical processing of waste automotive catalysts is valuable as a secondary resource. In this study, a process of platinum recovery from the hydrometallurgical residue by high-temperature smelting process was proposed. Results of lab- and pilot-scale experiments show a high recovery of more than 98% of platinum and glass slag was successfully
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Time-Dependent Monitoring of Seismic Wave Velocity Variation Associated with Three Major Seismic Events at a Deep, Narrow-Vein Mine Min. Metall. Explor. Pub Date : 2020-10-12 Setareh Ghaychi Afrouz, Erik Westman, Kathryn Dehn, Ben Weston
One of the most difficult challenges in underground mining is to forecast significant seismic events prior to their occurrence in order to support the safety of miners and to minimize damage to the underground operation. Passive seismic tomography is a tool to image the seismic velocity changes in a rockmass, which can potentially reveal the rockmass behavior before and after a significant seismic
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Managing Heat in Underground Mines: the Importance of Incorporating the Thermal Flywheel Effect into Climatic Modeling Min. Metall. Explor. Pub Date : 2020-10-09 Kyle A. Scalise, Marcelo Bandeira Teixeira, Karoly C. Kocsis
Understanding the effects of various ventilation and climatic parameters on the work conditions and comfort in underground mines is critical for efficient ventilation system design and cost savings and to ensure the health and safety of mine workers. To understand the effects that the thermal damping effect (TDE) and the thermal flywheel effect (TFE) have on the ventilation system design and potential
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A Geostatistical Solution to Estimating Groundwater Inflows in Deep Rock Tunnels with Validation Through Case Studies Min. Metall. Explor. Pub Date : 2020-10-09 Mark J. Vanarelli
Estimating groundwater inflows in rock deep tunnels is critical to the safety of personnel constructing the tunnel and the cost of construction. This paper presents two case studies for estimating steady-state groundwater inflows into deep rock tunnels. The case studies included the Chattahoochee and Nancy Creek tunnels. In this paper, statistical methods were applied to packer test data obtained from
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Kinetics of Atmospheric Leaching from a Brazilian Nickel Laterite Ore Allied to Redox Potential Control Min. Metall. Explor. Pub Date : 2020-10-07 A. L. A. Santos, E. M. A. Becheleni, P. R. M. Viana, R. M. Papini, F. P. C. Silvas, S. D. F. Rocha
The kinetics of atmospheric sulfuric acid leaching from a Brazilian nickel laterite ore was assessed using distinct reducing agents and ore mineralogy. This transitional ore contains 1.63% Ni distributed as 1.27% in coarse size (− 500 + 150 μm), mainly as silicates (lizardite and chlorite — 28.6%), and 2.06% in the fines fraction (− 75 μm), mainly as iron oxy-hydroxides (goethite and hematite — 49%)
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Assessing the Feasibility of a Commercially Available Wireless Internet of Things System to Improve Conveyor Safety Min. Metall. Explor. Pub Date : 2020-10-06 R. Jacksha, K. V. Raj
Conveyor systems persist in being a source of injuries and fatalities in the mining industry. To reduce these incidents, better methods are needed to enhance the monitoring of probable hazards and improve situational awareness during the normal operation and maintenance of conveyor systems. To address these issues, researchers from the National Institute for Occupational Safety and Health (NIOSH) continue
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Exploration Methodology Using Morphology and Alloy Composition of Alluvial Gold: A Case Study from Quaternary Deposits of the Nowshera District, Khyber Pakhtunkhwa, Pakistan Min. Metall. Explor. Pub Date : 2020-10-06 Liaqat Ali, Robert Chapman, Mohammad Farhan, Mohammad Tahir Shah, Seema Anjum Khattak, Asghar Ali
Alluvial gold is abundant in the Quaternary deposits of the Kabul and Indus rivers in District Nowshera, Khyber Pakhtunkhwa, Pakistan. Understanding the provenance of alluvial gold using morphology and elemental composition could be helpful in developing an exploration strategy of regional benefit. Detailed morphological studies of gold grains revealed high flatness index values which are indicative
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Effect of Transition Metal Impurities on the Adsorption of Flotation Reagents on Pyrite Surface Min. Metall. Explor. Pub Date : 2020-10-06 Yingchao Liu, Yuqiong Li, Jianhua Chen, Mingfei He
Pyrite is one of the most common sulfide minerals on earth, which is usually grown with chalcopyrite and other sulfide minerals. In flotation practice, pyrite from different mines or different sections in a same mine may have different flotation behaviors. This is because the pyrite crystal contains lattice defect, including ionic vacancy and lattice impurity. The present work investigates the effects
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Heat Stress in Hot Underground Mines: a Brief Literature Review Min. Metall. Explor. Pub Date : 2020-10-06 Paloma Lazaro, Moe Momayez
Interactions between human beings and their work environment require the body to regulate its temperature by balancing heat production and loss. Comfortable environmental conditions are crucial for keeping workers safe and healthy and to maintain a suitable level of productivity. However, achieving a proper core body temperature may become challenging under different conditions, especially in high
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Recovery of Heavy Metals from Liquid Effluent by Galvanic Cementation Min. Metall. Explor. Pub Date : 2020-10-02 Yehia M. Youssef, Nourhan Moukhtar, Ibrahim Hassan, M. H. Abdel-Aziz
Copper was recovered from copper sulfate solution in a batch-recycled galvanic reactor operated under forced convection with the generation of electrical energy during the cementation process. The divided galvanic cell consisted of parallel copper and zinc plates. The mass transfer rate and the amount of electrical energy generated were found to be directly proportional to the solution flow rate and
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Insights into the Relationships Among the Roof, Rib, Floor, and Pillars of Underground Coal Mines Min. Metall. Explor. Pub Date : 2020-10-01 Ted M. Klemetti, Mark A. Van Dyke, Nicole Evanek, Craig C. Compton, Ihsan Berk Tulu
Ground control failures continue to be one of the leading causes of injuries and fatalities in underground coal mining. The roof, rib, floor, and pillars are four areas of potential ground failures that miners, engineers, and consultants are continually evaluating. Quite often, these four underground structures are evaluated independently. A recent push to consider them as a system and in a similar
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A Data-Driven Approach to Control Fugitive Dust in Mine Operations Min. Metall. Explor. Pub Date : 2020-09-29 Muhammet Mustafa Kahraman, Mustafa Erkayaoglu
Particulate matter (PM) is one of the main actors related to air pollution caused by surface mining. Fugitive dust, considered as particulate matter that cannot be collected by conventional measures, is classified by the particle size. The Environmental Protection Agency (EPA) categorizes PM as coarse and fine particles based on the particle size being less than 10 μm (PM10) and less than 2.5 μm (PM2
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Microwave Processing of Low-Grade Banded Iron Ore with Different Reductants Min. Metall. Explor. Pub Date : 2020-09-21 Shrey Agrawal, Shaila Mir, Nikhil Dhawan
The current study investigates the effect of microwave processing on low-grade banded iron ore using charcoal, coking coal, and non-coking coal. Charcoal showed better microwave heating response at low temperatures, and the coals exhibit better heating response at higher temperatures. Low carbon dosage ~ 12% is sufficient to generate concentrate with 61.8% iron grade and ~6% for 94.8% iron recovery
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Measurement and Characterisation of Metallic Iron Particles on Coal-Based Reduction and Magnetic Separation of Refractory Titanomagnetite Min. Metall. Explor. Pub Date : 2020-09-18 Yongqiang Zhao, Tichang Sun, Zhengyao Li, Zhe Wang
Coal-based reduction followed by magnetic separation is a promising technology for processing refractory iron ores. Analysis of the size distribution of metallic iron particles is an effective approach for exploring the mechanisms of coal-based reduction. As metallic iron particles exhibit very complex shapes compared with nature ores, approaches for measuring and characterising metallic iron particles
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Selective Extraction of Zinc from Zinc Ferrite Min. Metall. Explor. Pub Date : 2020-09-16 Vivek Kashyap, Patrick Taylor
The presence of iron in sphalerite induces the formation of zinc ferrite (ZF) during roasting. Zinc refinery residues (ZRR) and electric arc furnace dust (EAFD) contain a significant amount of zinc ferrite and are difficult to treat. According to the literature, up to 71% ZF has been found to be present in ZRR. The dissolution of zinc ferrite is inefficient even in aqua regia. The Waelz process is
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