University of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Application of gravity separators for enrichment of South Chah-Palang tungsten ore1125730410.22059/ijmge.2016.57304ENHamidHedayati Sarab-shahrakM.Sc., Mineral Processing, School of Mining Engineering, College of Engineering,
University of Tehran, Tehran, IranMohammadNoaparastProfessor, Mineral Processing, School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran0000-0002-8688-4593Sied ZiaedinShafaei TonkaboniProfessor, Mineral Processing, School of Mining Engineering, College of Engineering, University of Tehran, Tehran, IranSied MehdiHosseiniM.Sc., Mineral Processing, Mining & Metallurgical Engineering, Yazd University, Yazd, IranJournal Article20140927In the present study, the possibility of concentrating tungsten-copper vein ore in South Chah-Palang was examined using gravity separators including Jig Machine (-2360+600 μm), shaking table (-600+120 μm), and multi-gravity separator (MGS) (-120 μm). The representative sample contains 1.5% WO3 and 5.95% CuO. The main tungsten minerals were ferberite and wolframite and their appropriate liberation degree was approximately in the range of 250 μm. Box-Behenken and CCD response surface methods were applied to model and optimize jig machine and MGS results, respectively. Shaking table performance was modeled by full factorial design method. In Jig machine tests, the effects of water flow rate, frequency and feed particle size were investigated. Deck inclination, wash water, and feed water flow rate were operational parameters in shaking table. In the MGS testes, the effects of two parameters of tilt angle and wash water flow rate were inspected. In this set of experiments, WO3 recovery and grade were considered as responses of each model. The maximum recovery of WO3 in jig machine was obtained in water flow rate of 3.71 lit/min, frequency of 153rpm, and the particle size range of -2360+1700 μm. In this case, the grade and recovery of WO3 were 2.85% and 94.33%, respectively. The maximum WO3 recovery was 93.9% with grade of 8.20 % using shaking table in the deck inclination of 11 degree, feed water flow rate of 7 lit/min, and wash water flow rate of 8 lit/min. The maximum WO3 recovery in MGS attained with 3.45 degrees tilt angle and wash water rate of 3.16 lit/min. The grade and recovery of WO3 in the MGS method were 4.2% and 90.61%, respectively.https://ijmge.ut.ac.ir/article_57304_95b69931c40228535a675f6639e04a9f.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601A real-time approach toward the chemical quality control of rock material (Case study: Gravel mines in Semnan, Iran13225730510.22059/ijmge.2016.57305ENBehzadTokhmechiAssociate Professor, Faculty of Mining, Petroleum and Geophysics Engineering, University of Shahrood, IranSeyed FazlolahSaghravaniAssistant Professor, Faculty of Civil Engineering, University of Shahrood, IranParhamJanfeshan AraghiPh.D. Candidate, Faculty of Civil Engineering, Isfahan University of Technology, IranHoseinMarviAssistant Professor, Faculty of Electrical and Robotic Engineering, University of Shahrood, IranMohamad EsmaeelBorhaniMining Engineer, Zaminnegar Pasargad Co., IranAbolfazlDarbaniCivil Engineer, Semnan Provincial GovernmentJournal Article20150626The quality of concrete is highly dependent on the characteristics of its aggregate, such as the size, minerals, and their chemical properties. Even a small amount of impurities, such as hydrated sulfates, chlorine (salt), and acidic pH of the rock material, can adversely affect the quality of the concrete. Thus, many national codes and standards are developed for testing, selecting, and employing the rock materials in concrete. For instance, Iranian standards 446, 449, 1702, 4978, 4984, 7174, and 86721 are currently serving this purpose. In the present research, a new real-time system was developed in order to replace the customary chemical analysis and size distribution tests. 20 samples were taken from two mines, selected by the Building Material Committee of Semnan Province, in order to determine the dissolved chlorine and sulfate, pH, density as well as size distribution. The new system is constituted of hydraulic jacks and a reservoir, designed to take samples from the conveyer in given time intervals. The samples were washed with distilled water and real-time analyses of dissolved chlorine and pH were performed. The results showed 85% agreement with the results from laboratory analyses. The correct classification rate (CCR) was 92% for 13 samples.https://ijmge.ut.ac.ir/article_57305_e98e3c632bdf1f9a8e4f63799b37853a.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Geological Hazards analysis in Urban Tunneling by EPB Machine (Case study: Tehran subway line 7 tunnel)23365730610.22059/ijmge.2016.57306ENHassanBakhshandeh AmniehSchool of Mining, College of Engineering, University of Tehran, Iran0000-0003-4075-0589Mohammad SaberZamzamDepartment of Mining Engineering, University of Kashan, IranM.R.MozdianfardDepartment of Chemical Engineering. University of Kashan, IranJournal Article20151011Technological progress in tunneling has led to modern and efficient tunneling methods in vast underground spaces even under inappropriate geological conditions. Identification and access to appropriate and sufficient geological hazard data are key elements to successful construction of underground structures. Choice of the method, excavation machine, and prediction of suitable solutions to overcome undesirable conditions depend on geological studies and hazard analysis. Identifying and investigating the ground hazards in excavating urban tunnels by an EPB machine could augment the strategy for improving soil conditions during excavation operations. In this paper, challenges such as geological hazards, abrasion of the machine cutting tools, clogging around these tools and inside the chamber, diverse work front, severe water level fluctuations, existence of water, and fine-grained particles in the route were recognized in a study of Tehran subway line 7, for which solutions such as low speed boring, regular cutter head checks, application of soil improving agents, and appropriate grouting were presented and discussed. Due to the presence of fine particles in the route, foam employment was suggested as the optimum strategy where no filler is needed.https://ijmge.ut.ac.ir/article_57306_4e76f7cacd4208de43dde1ea877a6c74.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Application of fractal modeling and PCA method for hydrothermal alteration mapping in the Saveh area (Central Iran) based on ASTER multispectral data37485730710.22059/ijmge.2016.57307ENMirkoAhmadfarajSchool of Mining Engineering, College of Engineering, University of Tehran, Tehran, IranMirsalehMirmohammadiSchool of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran.0000-0003-1681-4271PeymanAfzal1- Department of Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
2- Camborne School of Mines, University of Exeter, Penryn, UK.0000-0002-4833-8778Journal Article20151110The aim of this study is determination and separation of alteration zones using Concentration-Area (C-A) fractal model based on remote sensing data which has been extracted from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images. The studied area is on the SW part of Saveh, 1:250,000 geological map, which is located in Urumieh-Dokhtar magmatic belt, Central Iran. The pixel values were computed by Principal Component Analysis (PCA) method used to determine phyllic, argillic, and propylitic alteration zones. The C-A fractal model is utilized for separation of different parts of alteration zones due to their intensity. The log-log C-A plots reveal multifractal nature for phyllic, argillic, and propylitic alteration zones. The obtained results based on fractal model show that the main trend of the alteration zones is in NW-SE direction. Compared to the geological map of the study area and copper mineralizations, the alteration zones have been detected properly and correlate with the mineral occurrences, intrusive rock, and faults.https://ijmge.ut.ac.ir/article_57307_38a37d55bc0662e029444397bab72f13.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Accuracy evaluation of different statistical and geostatistical censored data imputation approaches (Case study: Sari Gunay gold deposit)49605730810.22059/ijmge.2016.57308ENBabakGhaneSimulation and Data Processing Laboratory, University College of Engineering, School of Mining Engineering, University of Tehran, Tehran, IranOmidAsghariSimulation and Data Processing Laboratory, University College of Engineering, School of Mining Engineering, University of Tehran, Tehran, Iran0000-0002-3587-0220Journal Article20151127Most of the geochemical datasets include missing data with different portions and this may cause a significant problem in geostatistical modeling or multivariate analysis of the data. Therefore, it is common to impute the missing data in most of geochemical studies. In this study, three approaches called half detection (HD), multiple imputation (MI), and the cosimulation based on Markov model 2 (MM2) are used to impute the censored data. According to the fact that the new datasets have to satisfy the original data underlying structure, the Multidimensional Scaling (MDS) approach has been used to explore the validity of different imputation methods. Log-ratio transformation (alr transformation) was performed to open the closed compositional data prior to applying the MDS method. Experiments showed that, based on the MDS approach, the MI and the MM2 could not satisfy the original underlying structure of the dataset as well as the HD approach. This is because these two mentioned approaches have produced values higher than the detection limit of the variables.https://ijmge.ut.ac.ir/article_57308_544fbb4f9cbf3abc939d72797fee147a.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601The reclamation of mica flakes from tailing disposal using gravity separators and flotation61765730910.22059/ijmge.2016.57309ENSeied Mohammad RaoofHoseiniDepartment of Mining Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran0000-0003-4369-4439AtaalahBahramiDepartment of Mining Engineering, Engineering Faculty, Urmia University, Urmia, IranMostafaHosseinzadeh3.Department of Mining Engineering, Engineering Faculty, Shahid Bahonar University, Kerman, Iran;Materials and Energy Research Center (MERC), Karaj, IranJournal Article20151103A sample from the small-sized tailing pile of an Iranian mica processing plant was subjected to a series of mica recovery experiments. Mineralogical and microscopic investigations indicated that the dominant mica mineral was phlogopite which was accompanied by plagioclase feldspars. Before beneficiation studies, the particle size distribution of the representative sample was obtained, and the specifications of each size fraction were investigated in detail. It was observed that the largest portion of mica (31%) is accumulated in the size range of 0.3 to 2.0 mm. Afterward, gravity concentration and flotation experiments were carried out. Results proved that shaking table could produce a mica concentrate with grade of 74%. Also, according to the flotation tests, it seemed the best size fraction was -150+75, and after that, -100+150. Flotation in combination with attrition scrubbing produced a concentrate with 92% mica content and 70% recovery. Finally, with respect to the results of all implemented experiments, a processing flow sheet was proposed for mica reclamation from the mentioned waste disposal.https://ijmge.ut.ac.ir/article_57309_4424b4ab432302d7f80c8e180b7c029b.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Identification of Ti- anomaly in stream sediment geochemistry using of stepwise factor analysis and multifractal model in Delijan district, Iran77955785810.22059/ijmge.2016.57858ENFeridonGhadimiAssistant professor, Department of Mining Engineering, Arak University of Technology, Arak, Iranghadimi2690078491MohammadGhomi1-PhD of student, Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran, E-Mail: mghomi@aut.ac.ir
2- Instructor, Department of Mining Engineering, Arak University of Technology.MojtabaAref SedighM.Sc student, Department of Mining Engineering, Arak University of Technology, Arak, IranJournal Article20151103In this study, 115 samples taken from the stream sediments were analyzed for concentrations of As, Co, Cr, Cu, Ni, Pb, W, Zn, Au, Ba, Fe, Mn, Sr, Ti, U, V and Zr. In order to outline mineralization-derived stream sediments, various mapping techniques including fuzzy factor score, geochemical halos and fractal model were used. Based on these models, concentrations of Co, Cr, Ni, Zn, Ba, Fe, Mn, Ti, U, V and Zr showed anomaly and anomaly distributed in the andesitic volcanic rocks. In addition, an anomaly map of each element was also ascertained the most ideal results for the exploration of deposits. Anomaly element associations can be successfully used in future geochemical exploration works. According to stream sediment study, it characterized high anomaly of Ti deposits in the central and northern of the area and it confirmed by study of heavy mineral in sediments and litho-geochemical study in the andesitic unites.https://ijmge.ut.ac.ir/article_57858_8465cafb809acda869ede3f963c371b3.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Effects of Weak Layer Angle and Thickness on the Stability of Rock Slopes971105785910.22059/ijmge.2016.57859ENGarmondyu ECrusoe JrChina University of Mining and TechnologyQing-xiangCaiChina University of Mining and TechnologyJi-senShuDepartment of Surface mining and slope Engineering
China University of Mining and TechnologyLiuHanChina University of Mining and TechnologyYamahBarvorChina University of Mining and TechnologyJournal Article20150813This paper researches two key factors (angle and thickness) of a weak layer in relation to their influencing mechanism on slope stability. It puts forward the sliding surface angle and morphological model criteria for the control of rock slopes and realization of its failure mechanism. By comparing the Failure Modes and Safety Factors (Fs) obtained from numerical analysis, the influence pattern for the weak layer angle and thickness on the stability of rock slopes is established. The result shows that the weak layer angle influences the slope by validating the existence of the “interlocking” situation. It also illustrates that as the angle of the weak layer increases, the Fs unceasingly decreases with an Fs transformation angle. The transformation interval of the Fs demonstrates the law of diminishing of a quadratic function. Analysis of the weak layer thickness on the influence pattern of slope stability reveals three decrease stages in the Fs values. The result also shows that the increase in the thickness of the weak layer increases the failure zone and influences the mode of failure. Given the theoretical and numerical analysis of a weak layer effects on the stability of rock slopes, this work provides a guiding role in understanding the influence of a weak layer on the failure modes and safety factors of rock slopes.https://ijmge.ut.ac.ir/article_57859_60a3e86131fcb0287630d9c4c545f94c.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601A New Analytical Solution for Determination of Acceptable Overall settlement of Heap Leaching Structures Foundation1111205786010.22059/ijmge.2016.57860ENEmadKhorasaniSchool of Mining Engineering, College of Engineering, University of TehranMehdiAminiSchool of Mining, College of Engineering, University of Tehran, Tehran0000-0000-0000-0000SaeedSoltani-MohammadiDepartment of Mining Engineering, University of Kashan0000-0002-8390-1917Journal Article20151017There are some artificial and natural materials on foundation of heap leaching structures. Geomembrane liner is the most important artificial isolated layer of these structures. The thickness of this layer is about 1 to 2 mm. Foundation overall settlement of such structures changes the primary length of the geomembrane layer. If the strain of geomembrane is more than allowable one, the layer will be fail and acid will leakage from the heap foundation. In this paper, foundation of the heap leaching structures is modeled with a hyperbolic curve and the length of geomembrane liner will be determined before and after loading. Next, with considering allowable strain of geomembrane materials, acceptable overall settlement of heap foundation is computed. Then, a design chart is presented for quick estimation of acceptable overall settlement of such structures. Finally, foundation overall settlement of a real case study (Tarom heap leaching structure) is determined with this approach. The analysis shows that geomembrane liner of this case may not fail due to foundation overall settlement.https://ijmge.ut.ac.ir/article_57860_96727562ebebd403711284e86d16b930.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Estimation of the Ampere Consumption of Dimension Stone Sawing Machine Using of Artificial Neural Networks1211305786110.22059/ijmge.2016.57861ENAhmadAryafarAssociate Professor, Faculty of Engineering, Department of Mining Engineering, University of Birjand, Birjand, Iran, P.O.Box: 97175-3760000-0001-5068-0508RezaMikaeilAssistant Professor, Faculty of Engineering, Department of Mining Engineering Urmia University of Technology, Urmia, Iran0000-0001-8404-3216Journal Article20151223Nowadays, estimating the ampere consumption and achieve to the optimum condition from the perspective of energy consumption is one of the most important steps to reduce the production costs. In this research it is tried to develop an accurate model for estimating the ampere consumption by using the artificial neural networks (ANN).In the first step, experimental studies were carried out on 7 carbonate rock samples in different conditions at particular feed rates (100, 200, 300and 400) and depth of cuts (15, 22, 30and 35mm) using a fully instrumented laboratory rig that is enable to change the machine parameters and measure the ampere consumption. In next step, a back propagation neural network was designed for modelling the sawing process for predicting the ampere consumption. The input network consisting of two parts: machine, work piece characteristics and the output of neural network was ampere consumption. This research evaluated the competencies of neural networks to estimate the ampere consumption in sawing process. The correlation coefficient between measured and predicted data in training and testing data is 0.95 and 0.97 respectively. The root mean square error (RMSE) for train and test data is 1.2 and 0.7 respectively. The results of this study showed that the ANNs can be used to estimate the ampere consumption with high ability and low error for industrial applications. Moreover, the cost of sawing machine ampere consumption can be accurately estimated using this neural model from some important physical and mechanical properties of rock.https://ijmge.ut.ac.ir/article_57861_39751511594929e7820b40c0d5afb7ee.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601An imperialist competitive algorithm for solving the production scheduling problem in open pit mine1311435786210.22059/ijmge.2016.57862ENMojtabaMokhtarian AslSahand University of TechnologyJavadSattarvandSahand University of TechnologyJournal Article20160105Production scheduling (planning) of an open-pit mine is the procedure during which the rock blocks are assigned to different production periods in a way that the highest net present value of the project achieved subject to operational constraints. The paper introduces a new and computationally less expensive meta-heuristic technique known as imperialist competitive algorithm (ICA) for long-term production planning of open pit mines. The proposed algorithm modifies the original rules of the assimilation process. The ICA performance for different levels of the control factors has been studied and the results are presented. The result showed that ICA could be efficiently applied on mine production planning problem.https://ijmge.ut.ac.ir/article_57862_0a624f525cf156567965efed8bf16b47.pdfUniversity of TehranInternational Journal of Mining and Geo-Engineering2345-693050120160601Transient Fluid Flow Modeling in Fractured Aquifer of Sechahoon Iron Mine Using Finite Element Method1451565786310.22059/ijmge.2016.57863ENMojtabaDarabiFaculty of Mining & Metallurgical Engineering, Yazd University, Yazd, IranAbdolhamidAnsariFaculty of Mining & Metallurgical Engineering, Yazd University, Yazd, IranNaderFathianpourDepartment of Mining Engineering, Isfahan University of Technology, Isfahan, Iran.AhmadGhorbaniFaculty of Mining & Metallurgical Engineering, Yazd University, Yazd, IranJournal Article20160125Considering the fact that a large volume of iron reserve in the Sechahoon Iron Mine in Yazd Province has located under the water table, it is necessary to conduct a comprehensive study on water flow within the pit and its surroundings. The conceptual model of the aquifer was created using surface and underground geological information compared with water table data of the area of interest. In the data preparation stages, in order to create the numerical model, Logan and Lufran tests were studied to determine the hydrodynamic coefficients of the layers, precipitation and evaporation were investigated, and fractures and faults of the region, as a medium for flow channels in the hard formation, were also studied. The model was created in a transient state between 2000 and 2014. To validate its results, the water table was measured 4 times in the last 4 months of 2014. Considering the complexities in the heterogeneous fractured aquifer of the study area, numerical modeling results for the basin in a transient state present 90 percent correlation with field studies. Having investigated the water balance in the region, the boundary condition of the model was determined as the input water from the eastern south and the runoff water in the western north of the region. Since the general trend of faults in the area is north-south, variation in the water table is slight on north-south and intense on the east-west direction. On the other hand, due to the fact that the maximum flow is along the faults and fractures, the water table contour lines in different locations over the region are closed.https://ijmge.ut.ac.ir/article_57863_8e60fa67cd6b0d662a2b04a9ca660979.pdf