Pub Date : 2022-04-03DOI: 10.1080/25726668.2021.2001255
Mojtaba Yeganejou, Mahdi Badiozamani, A. Moradi-Afrapoli, H. Askari-Nasab
ABSTRACT Predicting the fleet requirement based on fleet productivity estimation is one of the critical parts of a robust long-term mine plan. The dispatch logic that determines the return destination of the empty trucks is significantly important in the overall full and empty travel distances and trucks’ productivity. In this paper, a Monte-Carlo simulation model is presented to mimic the real truck-and-shovel operations and measure trucks’ productivity in terms of Tonne Per Gross Operating Hour (TPGOH). A linear programming model is integrated into the simulation model to optimize the dispatch decision through distance minimization subject to the mine’s production schedule. The historical data records of oil sands mining operations are used to validate model’s performance. The results show significant improvement over the existing mine site’s method with closely matching the real TPGOH and better estimation of the total empty travel distance, as a result of new dispatch model implementation.
{"title":"Integration of simulation and dispatch modelling to predict fleet productivity: an open-pit mining case","authors":"Mojtaba Yeganejou, Mahdi Badiozamani, A. Moradi-Afrapoli, H. Askari-Nasab","doi":"10.1080/25726668.2021.2001255","DOIUrl":"https://doi.org/10.1080/25726668.2021.2001255","url":null,"abstract":"ABSTRACT Predicting the fleet requirement based on fleet productivity estimation is one of the critical parts of a robust long-term mine plan. The dispatch logic that determines the return destination of the empty trucks is significantly important in the overall full and empty travel distances and trucks’ productivity. In this paper, a Monte-Carlo simulation model is presented to mimic the real truck-and-shovel operations and measure trucks’ productivity in terms of Tonne Per Gross Operating Hour (TPGOH). A linear programming model is integrated into the simulation model to optimize the dispatch decision through distance minimization subject to the mine’s production schedule. The historical data records of oil sands mining operations are used to validate model’s performance. The results show significant improvement over the existing mine site’s method with closely matching the real TPGOH and better estimation of the total empty travel distance, as a result of new dispatch model implementation.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87369380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-03DOI: 10.1080/25726668.2022.2051273
M. J. Rahimdel, A. Aryafar, Solmaz Vaziri
ABSTRACT Hazards in underground coal mines create an unsafe working environment for workers and equipment. This paper aims to analyze the safety risk in underground coal mining using an improved Failure Mode and Effect Analysis (FMEA) method. To achieve this, the causes of the main events that threaten the safety of the working environment were identified and discussed in a case study; Parvadeh Tabas coal mine, Iran. The Analytical Hierarchy Process (AHP) was applied to calculate the importance degree of each hazard. Then, the FMEA approach under the fuzzy environment was used for the safety risk analysis. Regarding the results of this study, the outburst-related hazards, failure to provide sufficient compressed air, and the electrical locomotive-related hazards have the highest level of safety risk. In this concept, it is possible to identify the leading causes of accidents and propose practical solutions to improve the safety conditions of the mine working places.
{"title":"Fuzzy FMEA for the safety risk analysis of underground coal mining (a case study in Iran)","authors":"M. J. Rahimdel, A. Aryafar, Solmaz Vaziri","doi":"10.1080/25726668.2022.2051273","DOIUrl":"https://doi.org/10.1080/25726668.2022.2051273","url":null,"abstract":"ABSTRACT Hazards in underground coal mines create an unsafe working environment for workers and equipment. This paper aims to analyze the safety risk in underground coal mining using an improved Failure Mode and Effect Analysis (FMEA) method. To achieve this, the causes of the main events that threaten the safety of the working environment were identified and discussed in a case study; Parvadeh Tabas coal mine, Iran. The Analytical Hierarchy Process (AHP) was applied to calculate the importance degree of each hazard. Then, the FMEA approach under the fuzzy environment was used for the safety risk analysis. Regarding the results of this study, the outburst-related hazards, failure to provide sufficient compressed air, and the electrical locomotive-related hazards have the highest level of safety risk. In this concept, it is possible to identify the leading causes of accidents and propose practical solutions to improve the safety conditions of the mine working places.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85805037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-03DOI: 10.1080/25726668.2021.2007335
Amir Nematollahi Sarvestani, P. Oreste, Sandro Gennaro
ABSTRACT Natural ventilation can play a significant role, which requires careful evaluation. It is necessary to adopt numerical calculation methods to study the ventilation circuit. This paper illustrates a numerical study of an underground gypsum quarry in Italy using the Ventsim computer program. Through this study, it was possible to determine the improvement interventions necessary to optimize the airflow that reaches the active sites of the mine, avoiding the risk of air recirculation in the deepest zones. A detailed analysis made it possible to detect how the planned interventions were also able to significantly improve the environmental conditions, considerably lowering the concentration of harmful gases emitted by diesel engines.
{"title":"Improving environmental conditions of a Room and Pillar underground quarry using numerical modelling of the ventilation system","authors":"Amir Nematollahi Sarvestani, P. Oreste, Sandro Gennaro","doi":"10.1080/25726668.2021.2007335","DOIUrl":"https://doi.org/10.1080/25726668.2021.2007335","url":null,"abstract":"ABSTRACT Natural ventilation can play a significant role, which requires careful evaluation. It is necessary to adopt numerical calculation methods to study the ventilation circuit. This paper illustrates a numerical study of an underground gypsum quarry in Italy using the Ventsim computer program. Through this study, it was possible to determine the improvement interventions necessary to optimize the airflow that reaches the active sites of the mine, avoiding the risk of air recirculation in the deepest zones. A detailed analysis made it possible to detect how the planned interventions were also able to significantly improve the environmental conditions, considerably lowering the concentration of harmful gases emitted by diesel engines.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83153488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-03DOI: 10.1080/25726668.2022.2046684
Stephen P. Magohe, Nice Shoo, Emilia Mapogha, C. Kinabo, Conrad Chambulikazi
ABSTRACT We present findings from a blast movement monitoring research conducted as a part of mine to mill campaign at the Geita Gold Mine—and additional data from blast monitoring practices at North Mara Gold Mine. These include measurement of the blast-induced rock movement and perimeter translation after blast derived from a blast shot at Nyankanga pit (Geita Gold Mine) and three other shots at the Nyabirama pit (North Mara Gold Mine). Using Blast Movement Technology, 34 movement-monitoring balls installed in 13 blast-monitoring boreholes made possible estimation of the average vertical and horizontal ore movements in the studied blast shots. Recorded ore movement estimates average horizontal and vertical movements of 3.69 and 1.56 m, respectively, at the Nyabirama pit and average horizontal and vertical movements of 4.5 and 2.48 m, respectively, at the Nyankanga pit. Based on the estimated material movements, zones of ore losses and dilution are established and new dig lines are proposed from successful ore block translation in all blast shots.
{"title":"Monitoring rock movement and—controlling ore loss and dilution associated with blasting at Geita and North Mara Gold mines, Tanzania","authors":"Stephen P. Magohe, Nice Shoo, Emilia Mapogha, C. Kinabo, Conrad Chambulikazi","doi":"10.1080/25726668.2022.2046684","DOIUrl":"https://doi.org/10.1080/25726668.2022.2046684","url":null,"abstract":"ABSTRACT\u0000 We present findings from a blast movement monitoring research conducted as a part of mine to mill campaign at the Geita Gold Mine—and additional data from blast monitoring practices at North Mara Gold Mine. These include measurement of the blast-induced rock movement and perimeter translation after blast derived from a blast shot at Nyankanga pit (Geita Gold Mine) and three other shots at the Nyabirama pit (North Mara Gold Mine). Using Blast Movement Technology, 34 movement-monitoring balls installed in 13 blast-monitoring boreholes made possible estimation of the average vertical and horizontal ore movements in the studied blast shots. Recorded ore movement estimates average horizontal and vertical movements of 3.69 and 1.56 m, respectively, at the Nyabirama pit and average horizontal and vertical movements of 4.5 and 2.48 m, respectively, at the Nyankanga pit. Based on the estimated material movements, zones of ore losses and dilution are established and new dig lines are proposed from successful ore block translation in all blast shots.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79122235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/25726668.2021.1974216
Cui Tao, Xie Jiacheng, Xuewen Wang, Zhang Xin, Li Suhua, Dong Mengyao
ABSTRACT This paper proposes a method of constructing a high-precision virtual scene of mining equipment, coal seam roof and floor using actual mining data to meet the industry’s visualisation demands. By analysing the relationships between the shearer, scraper conveyor and coal seam, four kinds of coal seam floor construction methods are established on the basis of the shearer’s running track, the cutting track, the running track of the supporting slipper and the shape of scraper conveyor. The virtual operation scene of the mining and transportation equipment is built in Unity3D to achieve a collaborative operation in a complex coal seam environment. By comparing the actual pitch angle with the virtual pitch angle of the shearer, it is found that the running track of the supporting slipper can better reflect the change trend of the coal seam floor. This method improves the accuracy of the virtual simulation of mining and transportation equipment and provides technical support for its virtual monitoring.
{"title":"Constructing a high-precision virtual scene of mining equipment and coal seam roof and floor using actual mining data","authors":"Cui Tao, Xie Jiacheng, Xuewen Wang, Zhang Xin, Li Suhua, Dong Mengyao","doi":"10.1080/25726668.2021.1974216","DOIUrl":"https://doi.org/10.1080/25726668.2021.1974216","url":null,"abstract":"ABSTRACT This paper proposes a method of constructing a high-precision virtual scene of mining equipment, coal seam roof and floor using actual mining data to meet the industry’s visualisation demands. By analysing the relationships between the shearer, scraper conveyor and coal seam, four kinds of coal seam floor construction methods are established on the basis of the shearer’s running track, the cutting track, the running track of the supporting slipper and the shape of scraper conveyor. The virtual operation scene of the mining and transportation equipment is built in Unity3D to achieve a collaborative operation in a complex coal seam environment. By comparing the actual pitch angle with the virtual pitch angle of the shearer, it is found that the running track of the supporting slipper can better reflect the change trend of the coal seam floor. This method improves the accuracy of the virtual simulation of mining and transportation equipment and provides technical support for its virtual monitoring.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86271881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/25726668.2021.1986968
R. Seedsman
ABSTRACT The prediction of the depth of fracturing in the sides of underground excavations in coal seams is needed to determine the requirements for rib support and to assess pillar stability. The prediction requires consideration of how coal strength is determined and extrapolated to the mine scale and how stresses are redistributed around excavations in bedded coal masses. The impact of bedding in a stress analysis can be examined by adopting transverse isotropy and this results in much lower confining stresses in the horizontal plane and much higher vertical stresses close to the excavation boundary. The extent of rib scaling can be derived if the bedded coal is modelled as a brittle material. For coal pillars, the depth of scaling may be sufficient to have a material impact on their effective width and hence stability. The specification of rib support needs to consider how the failed coal may subsequently collapse.
{"title":"Rib scaling and the stability of coal pillars","authors":"R. Seedsman","doi":"10.1080/25726668.2021.1986968","DOIUrl":"https://doi.org/10.1080/25726668.2021.1986968","url":null,"abstract":"ABSTRACT The prediction of the depth of fracturing in the sides of underground excavations in coal seams is needed to determine the requirements for rib support and to assess pillar stability. The prediction requires consideration of how coal strength is determined and extrapolated to the mine scale and how stresses are redistributed around excavations in bedded coal masses. The impact of bedding in a stress analysis can be examined by adopting transverse isotropy and this results in much lower confining stresses in the horizontal plane and much higher vertical stresses close to the excavation boundary. The extent of rib scaling can be derived if the bedded coal is modelled as a brittle material. For coal pillars, the depth of scaling may be sufficient to have a material impact on their effective width and hence stability. The specification of rib support needs to consider how the failed coal may subsequently collapse.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77483918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/25726668.2021.1977903
B. Rakishev, A. Orynbay, A. B. Mussakhan, A. I. Tuktibayev
ABSTRACT The article substantiates a stage-by-stage physical model of destruction of a real rock mass. On its basis, the key results of an explosion in a solid medium were determined: the strength characteristic of rocks under conditions of all-round explosive loading, the relative limiting radius of the blast cavity, the radii of the zones of fine crushing and radial cracks, and the principle of the rational arrangement of charges in the blasted block was formulated. Using this principle, an analytical method has been developed for determining the rational parameters of the location of charges in the face of preparatory workings and their computer-aided design. Experimental explosions carried out in the underground mines of Kazakhmys Corporation LLP confirmed the operability of the proposed automated design of drilling and blasting operations in horizontal underground workings. The proposed results are in good agreement with the data presented in the works of a number of world authors.
{"title":"Computer-aided design of rational parameters for the location of blasthole charges in horizontal underground development","authors":"B. Rakishev, A. Orynbay, A. B. Mussakhan, A. I. Tuktibayev","doi":"10.1080/25726668.2021.1977903","DOIUrl":"https://doi.org/10.1080/25726668.2021.1977903","url":null,"abstract":"ABSTRACT The article substantiates a stage-by-stage physical model of destruction of a real rock mass. On its basis, the key results of an explosion in a solid medium were determined: the strength characteristic of rocks under conditions of all-round explosive loading, the relative limiting radius of the blast cavity, the radii of the zones of fine crushing and radial cracks, and the principle of the rational arrangement of charges in the blasted block was formulated. Using this principle, an analytical method has been developed for determining the rational parameters of the location of charges in the face of preparatory workings and their computer-aided design. Experimental explosions carried out in the underground mines of Kazakhmys Corporation LLP confirmed the operability of the proposed automated design of drilling and blasting operations in horizontal underground workings. The proposed results are in good agreement with the data presented in the works of a number of world authors.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89130791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/25726668.2021.1992980
Rene Le-Feaux, R. Castro, D. Cortez, R. Gómez, Diego Silva
ABSTRACT The most widely used production level layouts in block cave mines have been the El Teniente and Herringbone. However, these patterns face some challenges that can be improved, such as reducing LHD cycle times, improved pillar geometries for a better production level stability and enhancements in time and cost during construction. In that context, this work proposes a hybrid extraction level design for Block Caving, integrating productivity and geometry to achieve a balance based on experience and theory. A methodology is proposed to compare with El Teniente layout in terms of constructability, ground support, and main operational parameters. The results indicate that a hybrid layout offers advantages compared to the El Teniente layout based on the area and input variables analysed. Although further studies are recommended for industrial validation, the results obtained here show that the proposed layout is feasible and has the potential to be applied in block cave mining.
{"title":"A hybrid extraction level layout design for block caving","authors":"Rene Le-Feaux, R. Castro, D. Cortez, R. Gómez, Diego Silva","doi":"10.1080/25726668.2021.1992980","DOIUrl":"https://doi.org/10.1080/25726668.2021.1992980","url":null,"abstract":"ABSTRACT The most widely used production level layouts in block cave mines have been the El Teniente and Herringbone. However, these patterns face some challenges that can be improved, such as reducing LHD cycle times, improved pillar geometries for a better production level stability and enhancements in time and cost during construction. In that context, this work proposes a hybrid extraction level design for Block Caving, integrating productivity and geometry to achieve a balance based on experience and theory. A methodology is proposed to compare with El Teniente layout in terms of constructability, ground support, and main operational parameters. The results indicate that a hybrid layout offers advantages compared to the El Teniente layout based on the area and input variables analysed. Although further studies are recommended for industrial validation, the results obtained here show that the proposed layout is feasible and has the potential to be applied in block cave mining.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80398426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-02DOI: 10.1080/25726668.2021.1985885
G. Oniyide, H. Yilmaz, E. Nordlund
ABSTRACT This paper presents the result of the research carried out on the effect of temperature on the Bushveld Igneous Complex (BIC), South Africa. The BIC has high virgin rock temperature. If the platinum mines advance to ultra-deep levels, then the virgin rock temperature at a depth of 5 km will be approximately 140°C. Hence, there is a need to improve the understanding of the behaviour of rock under high temperatures. Five rock types were tested in a 2600 kN servo-controlled testing machine. The testing was done at a controlled loading rate and a confining pressure 0, 10, and 30 MPa within temperature range of 20–140°C. Comparison was made between the results obtained from the laboratory experiments and numerical modelling. It was observed from the stress–strain behaviour of the samples that an increase in temperature results in the reduction of the Young’s modulus and peak strength.
{"title":"Effect of temperature variation on the behaviour of Bushveld rocks: comparison of laboratory test and numerical modelling results","authors":"G. Oniyide, H. Yilmaz, E. Nordlund","doi":"10.1080/25726668.2021.1985885","DOIUrl":"https://doi.org/10.1080/25726668.2021.1985885","url":null,"abstract":"ABSTRACT This paper presents the result of the research carried out on the effect of temperature on the Bushveld Igneous Complex (BIC), South Africa. The BIC has high virgin rock temperature. If the platinum mines advance to ultra-deep levels, then the virgin rock temperature at a depth of 5 km will be approximately 140°C. Hence, there is a need to improve the understanding of the behaviour of rock under high temperatures. Five rock types were tested in a 2600 kN servo-controlled testing machine. The testing was done at a controlled loading rate and a confining pressure 0, 10, and 30 MPa within temperature range of 20–140°C. Comparison was made between the results obtained from the laboratory experiments and numerical modelling. It was observed from the stress–strain behaviour of the samples that an increase in temperature results in the reduction of the Young’s modulus and peak strength.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82105629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-02DOI: 10.1080/25726668.2021.1959750
P. Pal Roy, C. Sawmliana, R. Singh
ABSTRACT An innovative scheme of induced caving by blasting was adopted in the depillaring continuous miner panel CM1 of Jhanjra Colliery of Eastern Coalfields Limited, a subsidiary of Coal India Limited. Initially, the blasting pattern was designed with respect to underground workings and later with respect to the surface, vertically above the panel, to facilitate effective caving. The natural caving was delayed due to the presence of three hard-rock beds of more than 5000 cavability index in the immediate roof of the R-VI seam in addition to the oversized left-out standing pillars kept during coal extraction in the panel, which provided extra supports to the hanging roof-rock in the goaf. To mitigate the situation, the design parameters were meticulously planned and implemented for successful blasting operations, which led to effective caving in the goaf and enabled successful extraction of the coal from the panel maintaining the required level of safety and productivity.
{"title":"Design of blasting patterns to induce effective caving in continuous miner depillaring panel – a case study","authors":"P. Pal Roy, C. Sawmliana, R. Singh","doi":"10.1080/25726668.2021.1959750","DOIUrl":"https://doi.org/10.1080/25726668.2021.1959750","url":null,"abstract":"ABSTRACT An innovative scheme of induced caving by blasting was adopted in the depillaring continuous miner panel CM1 of Jhanjra Colliery of Eastern Coalfields Limited, a subsidiary of Coal India Limited. Initially, the blasting pattern was designed with respect to underground workings and later with respect to the surface, vertically above the panel, to facilitate effective caving. The natural caving was delayed due to the presence of three hard-rock beds of more than 5000 cavability index in the immediate roof of the R-VI seam in addition to the oversized left-out standing pillars kept during coal extraction in the panel, which provided extra supports to the hanging roof-rock in the goaf. To mitigate the situation, the design parameters were meticulously planned and implemented for successful blasting operations, which led to effective caving in the goaf and enabled successful extraction of the coal from the panel maintaining the required level of safety and productivity.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74576263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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