Pub Date : 2021-01-02DOI: 10.1080/25726668.2021.1871820
R. Hansen
ABSTRACT With an increasing demand for early detection of mining vehicle fires, the question is how an early detection could be achieved? Data from cone calorimeter tests and incident summary data were applied when analysing possible fire detection solutions on mining vehicles. Based on the tests, pre-ignition and post-ignition solutions in the cab and the engine compartment were analysed and presented. If overcoming the challenges of the environment, smoke sensors could for example be a potential pre-ignition detector in engine compartments. Based on the incident summaries, clues on detectable traces, etc., were identified and a discussion on the types of sensors for various types of vehicles and sections was provided. Fires in for example the turbo/exhaust area and engine compartment, could be detected prior to ignition using gas sensors to detect the emitted hydrocarbons or an oil mist detection system.
{"title":"Pre-ignition detection and early fire detection in mining vehicles","authors":"R. Hansen","doi":"10.1080/25726668.2021.1871820","DOIUrl":"https://doi.org/10.1080/25726668.2021.1871820","url":null,"abstract":"ABSTRACT With an increasing demand for early detection of mining vehicle fires, the question is how an early detection could be achieved? Data from cone calorimeter tests and incident summary data were applied when analysing possible fire detection solutions on mining vehicles. Based on the tests, pre-ignition and post-ignition solutions in the cab and the engine compartment were analysed and presented. If overcoming the challenges of the environment, smoke sensors could for example be a potential pre-ignition detector in engine compartments. Based on the incident summaries, clues on detectable traces, etc., were identified and a discussion on the types of sensors for various types of vehicles and sections was provided. Fires in for example the turbo/exhaust area and engine compartment, could be detected prior to ignition using gas sensors to detect the emitted hydrocarbons or an oil mist detection system.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"4 1","pages":"22 - 35"},"PeriodicalIF":1.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73009598","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 : 2021-01-02DOI: 10.1080/25726668.2021.1872261
Shahrokh Paravarzar, H. Askari-Nasab, Y. Pourrahimian, X. Emery
ABSTRACT The main objective of this study is to provide a practical and near-optimal mine production schedule for block caving operations considering operational uncertainty. The problem is defined in the context of goal programming optimization to meet the operational objectives, including tonnage and grade as daily production targets. The considered operational constraints include drawpoints and ore pass design, draw rate, mine production, and transportation capacities in different operational levels, tonnage and grade constraints, and mine production targets in the presence of several mining sectors. The developed model is verified and validated using historical operational data obtained from an actual block caving operation. The practicality and flexibility of the framework are examined through three different operational scenarios and compared with the real block caving operation mine plans and historical production data.
{"title":"Simultaneous multi-sector block cave mine production scheduling considering operational uncertainties","authors":"Shahrokh Paravarzar, H. Askari-Nasab, Y. Pourrahimian, X. Emery","doi":"10.1080/25726668.2021.1872261","DOIUrl":"https://doi.org/10.1080/25726668.2021.1872261","url":null,"abstract":"ABSTRACT The main objective of this study is to provide a practical and near-optimal mine production schedule for block caving operations considering operational uncertainty. The problem is defined in the context of goal programming optimization to meet the operational objectives, including tonnage and grade as daily production targets. The considered operational constraints include drawpoints and ore pass design, draw rate, mine production, and transportation capacities in different operational levels, tonnage and grade constraints, and mine production targets in the presence of several mining sectors. The developed model is verified and validated using historical operational data obtained from an actual block caving operation. The practicality and flexibility of the framework are examined through three different operational scenarios and compared with the real block caving operation mine plans and historical production data.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"8 1","pages":"36 - 51"},"PeriodicalIF":1.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85995423","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 : 2020-12-15DOI: 10.1080/25726668.2020.1857156
Luana Teixeira Pontara Lopes, Fernando Cesar Fernandes Junior, Edmo da Cunha Rodovalho, Thammiris Mohamad El Hajj
ABSTRACT The mining sector is looking for new technologies to minimise its environmental impacts and to maximise its reserves. The need to increase the life of mines has led to investigations considering the options to maximise Brazilian bauxite mine reserves. This work evaluates the use of a flip screen in the loader bucket to recover ore from the overburden. The study investigates both the financial and technical feasibilities of this option. This device results in a decrease in the amount of waste and an increase in the life of mine. An average mass recovery of 48% is achieved. The concentration of the bauxite present in the overburden is possible using only screening and the oversized (>12.7 mm) product contains 40% of the available alumina, with less than 4% reactive silica and 0.5% organic carbon, which is acceptable for the Bayer process.
{"title":"Impact assessment of waste screening over the life of a Brazilian bauxite mining operation","authors":"Luana Teixeira Pontara Lopes, Fernando Cesar Fernandes Junior, Edmo da Cunha Rodovalho, Thammiris Mohamad El Hajj","doi":"10.1080/25726668.2020.1857156","DOIUrl":"https://doi.org/10.1080/25726668.2020.1857156","url":null,"abstract":"ABSTRACT The mining sector is looking for new technologies to minimise its environmental impacts and to maximise its reserves. The need to increase the life of mines has led to investigations considering the options to maximise Brazilian bauxite mine reserves. This work evaluates the use of a flip screen in the loader bucket to recover ore from the overburden. The study investigates both the financial and technical feasibilities of this option. This device results in a decrease in the amount of waste and an increase in the life of mine. An average mass recovery of 48% is achieved. The concentration of the bauxite present in the overburden is possible using only screening and the oversized (>12.7 mm) product contains 40% of the available alumina, with less than 4% reactive silica and 0.5% organic carbon, which is acceptable for the Bayer process.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"93 1","pages":"1 - 7"},"PeriodicalIF":1.1,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77438690","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 : 2020-10-01DOI: 10.1080/25726668.2020.1838775
B. Rakishev, Z. Rakisheva, A. Auezova, A. Orynbay
ABSTRACT The article describes the developed new digital hierarchical model of lumpiness of blasted rocks. It is based on a combination of classes of pieces of rock by size, taken as hierarchical levels of lumpiness of rocks, and the percentage of pieces in classes, adopted for its numerical characteristics. 7 classes of rocks by size are considered, each of which is characterized by the content of its pieces. The key component of the proposed model - the granulometric composition of the blasted rocks is determined by the block mass of the rocks, the size of the zones of intense crushing, the volume of crushed rocks due to the action of stress waves and reflected waves (I stage of explosion), detonation products (swelling effect of the explosion) (II stage of explosion), and collisions of large pieces when moving (III stage of explosion). The regularities of the formation of these explosion results are established depending on the different combination of the physicomechanical properties of the rocks of the massif, the chemophysical characteristics of the explosive used, the parameters of the explosives and the explosive method.
{"title":"Digital hierarchical model of lumpiness of blasted rock mass","authors":"B. Rakishev, Z. Rakisheva, A. Auezova, A. Orynbay","doi":"10.1080/25726668.2020.1838775","DOIUrl":"https://doi.org/10.1080/25726668.2020.1838775","url":null,"abstract":"ABSTRACT The article describes the developed new digital hierarchical model of lumpiness of blasted rocks. It is based on a combination of classes of pieces of rock by size, taken as hierarchical levels of lumpiness of rocks, and the percentage of pieces in classes, adopted for its numerical characteristics. 7 classes of rocks by size are considered, each of which is characterized by the content of its pieces. The key component of the proposed model - the granulometric composition of the blasted rocks is determined by the block mass of the rocks, the size of the zones of intense crushing, the volume of crushed rocks due to the action of stress waves and reflected waves (I stage of explosion), detonation products (swelling effect of the explosion) (II stage of explosion), and collisions of large pieces when moving (III stage of explosion). The regularities of the formation of these explosion results are established depending on the different combination of the physicomechanical properties of the rocks of the massif, the chemophysical characteristics of the explosive used, the parameters of the explosives and the explosive method.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"726 1","pages":"228 - 237"},"PeriodicalIF":1.1,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78749485","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 : 2020-10-01DOI: 10.1080/25726668.2020.1818029
M. Bloss, G. Capes, Russell Seib, Liam V. Alford, Jack L. Light, I. Minniakhmetov, C. Nielsen
ABSTRACT Mining occurs in highly variable, spatially dynamic environments. Existing methods of planning and operations management are insufficient to adequately account for variability. Managing variability within the value chain aims to maximise business value. This paper presents a methodology for managing variability. This includes: assessing the impact of variability on a deterministic mine schedule; applying guiding principles based on Theory of Constraints to stabilise and exploit the value chain; developing a risk approach to minimise costs of plan delivery; and establishing tools for critical path planning, reconciling performance against plan and establishing corrective actions to deliver plan outcomes. A case study is presented from the Olympic Dam mine. Conclusions include: operations contain significant variability that if not managed will fail to deliver the mine plan; the proposed methodology can be applied to reduce variability and robustly deliver the best-value mine plan; and this methodology has broad application across the mining industry.
{"title":"Value chain excellence – managing variability to stabilise and exploit the mine value chain","authors":"M. Bloss, G. Capes, Russell Seib, Liam V. Alford, Jack L. Light, I. Minniakhmetov, C. Nielsen","doi":"10.1080/25726668.2020.1818029","DOIUrl":"https://doi.org/10.1080/25726668.2020.1818029","url":null,"abstract":"ABSTRACT Mining occurs in highly variable, spatially dynamic environments. Existing methods of planning and operations management are insufficient to adequately account for variability. Managing variability within the value chain aims to maximise business value. This paper presents a methodology for managing variability. This includes: assessing the impact of variability on a deterministic mine schedule; applying guiding principles based on Theory of Constraints to stabilise and exploit the value chain; developing a risk approach to minimise costs of plan delivery; and establishing tools for critical path planning, reconciling performance against plan and establishing corrective actions to deliver plan outcomes. A case study is presented from the Olympic Dam mine. Conclusions include: operations contain significant variability that if not managed will fail to deliver the mine plan; the proposed methodology can be applied to reduce variability and robustly deliver the best-value mine plan; and this methodology has broad application across the mining industry.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"17 1","pages":"187 - 205"},"PeriodicalIF":1.1,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73604406","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 : 2020-10-01DOI: 10.1080/25726668.2020.1838110
M. D. Bedford, Angel J. A. Rodríguez López, P. Foster
ABSTRACT A low-cost, low-weight leaky feeder system is proposed for mines rescue communication for use when the mine’s permanent communication infrastructure has been compromised by an incident. Unlike the leaky feeders that are permanently installed in some transport tunnels and mines, which are very expensive, bulky and heavy, the system described here relies on the fact that some ordinary coaxial cables leak signal unintentionally. Experimental evaluation of the two main types of low-cost coaxial cable identified a suitable cable and an optimal frequency of 27 MHz. Longer range tests characterised the real world underground performance of a system. A range of around a kilometre is achievable but this could be increased substantially by using in-line amplifiers. In comparison to low-frequency guidewire systems that have previously been produced for mines rescue use, the method outlined here does not force rescuers to clip handsets to the cable, thereby allowing them much more freedom of movement.
{"title":"Low-cost leaky feeder communication for mines rescue","authors":"M. D. Bedford, Angel J. A. Rodríguez López, P. Foster","doi":"10.1080/25726668.2020.1838110","DOIUrl":"https://doi.org/10.1080/25726668.2020.1838110","url":null,"abstract":"ABSTRACT A low-cost, low-weight leaky feeder system is proposed for mines rescue communication for use when the mine’s permanent communication infrastructure has been compromised by an incident. Unlike the leaky feeders that are permanently installed in some transport tunnels and mines, which are very expensive, bulky and heavy, the system described here relies on the fact that some ordinary coaxial cables leak signal unintentionally. Experimental evaluation of the two main types of low-cost coaxial cable identified a suitable cable and an optimal frequency of 27 MHz. Longer range tests characterised the real world underground performance of a system. A range of around a kilometre is achievable but this could be increased substantially by using in-line amplifiers. In comparison to low-frequency guidewire systems that have previously been produced for mines rescue use, the method outlined here does not force rescuers to clip handsets to the cable, thereby allowing them much more freedom of movement.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"53 1","pages":"217 - 227"},"PeriodicalIF":1.1,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80064864","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 : 2020-10-01DOI: 10.1080/25726668.2020.1834972
P. Pal Roy, C. Sawmliana, A. Prakash, R. Singh
ABSTRACT It was an extremely challenging task from the safety standpoint to exploit the developed coal pillars in No. 15 top and bottom seams at the Tata Steel Ltd Sijua Colliery by deep-hole opencast blasting above fire affected areas in No. 13 seam and No. 14 seam and a depillaring panel in No. 10 seam. The danger was that the depillaring operations in No. 10 seam could cause subsidence on the floor of the opencast workings and that the ground vibrations generated due to opencast blasting could destabilize the underground fire areas and cause structural damage to isolation stoppings in No. 13 and 14 seams. The scientific approach proposed by the authors may make it possible to extract the locked-up coal without jeopardizing the safety of the fire affected and depillared panels.
{"title":"Safe exploitation of developed pillars of a coal seam above fire affected areas – a case study","authors":"P. Pal Roy, C. Sawmliana, A. Prakash, R. Singh","doi":"10.1080/25726668.2020.1834972","DOIUrl":"https://doi.org/10.1080/25726668.2020.1834972","url":null,"abstract":"ABSTRACT It was an extremely challenging task from the safety standpoint to exploit the developed coal pillars in No. 15 top and bottom seams at the Tata Steel Ltd Sijua Colliery by deep-hole opencast blasting above fire affected areas in No. 13 seam and No. 14 seam and a depillaring panel in No. 10 seam. The danger was that the depillaring operations in No. 10 seam could cause subsidence on the floor of the opencast workings and that the ground vibrations generated due to opencast blasting could destabilize the underground fire areas and cause structural damage to isolation stoppings in No. 13 and 14 seams. The scientific approach proposed by the authors may make it possible to extract the locked-up coal without jeopardizing the safety of the fire affected and depillared panels.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"19 1","pages":"206 - 216"},"PeriodicalIF":1.1,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87211256","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}
ABSTRACT This paper presents a virtual monitoring method of operation conditions. The mathematical calculation model of a shearer and a scraper conveyor was established. Based on the model and the real-time motion trajectory of the shearer, measuring the pitch angles of 4–6 middle troughs as a priori information, the pitch angle of the next section could be calculated by rolling, thus the shape of a scraper conveyor was obtained. The method was programmed into the bottom layer of the Unity3D software. A real-time display and updating of virtual images were realised with data visualisation driving technology. The method was verified experimentally, with the results producing an error between the calculated and actual layout forms of the scraper conveyor of less than 15 mm. The actual operation state of the equipment remains synchronised in real time with the equipment in the virtual monitoring screen. Importantly, the detection accuracy satisfies the practical requirements.
{"title":"A virtual monitoring method of operation conditions for mining and transporting equipment based on real-time data","authors":"Xiubo Jiao, Xin Zhang, Jiacheng Xie, Tao Cui, Binbin Wang, Hongda Shen","doi":"10.1080/25726668.2020.1798085","DOIUrl":"https://doi.org/10.1080/25726668.2020.1798085","url":null,"abstract":"ABSTRACT This paper presents a virtual monitoring method of operation conditions. The mathematical calculation model of a shearer and a scraper conveyor was established. Based on the model and the real-time motion trajectory of the shearer, measuring the pitch angles of 4–6 middle troughs as a priori information, the pitch angle of the next section could be calculated by rolling, thus the shape of a scraper conveyor was obtained. The method was programmed into the bottom layer of the Unity3D software. A real-time display and updating of virtual images were realised with data visualisation driving technology. The method was verified experimentally, with the results producing an error between the calculated and actual layout forms of the scraper conveyor of less than 15 mm. The actual operation state of the equipment remains synchronised in real time with the equipment in the virtual monitoring screen. Importantly, the detection accuracy satisfies the practical requirements.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"8 1","pages":"175 - 186"},"PeriodicalIF":1.1,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84131343","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 : 2020-07-02DOI: 10.1080/25726668.2020.1788843
G. Bylapudi, K. Mondal, A. Spearing, A. Bhagwat
ABSTRACT Corrosion of rock bolts is a relatively slow process yet a potential problem for the underground mining industry. Mine groundwater in the strata through natural or mining-induced cracks together with the humid environment in the mine openings interact with the roof support systems often resulting in corrosion. Electrochemical studies of the commonly used rock bolt steel in the coal mining environments will lead to a better understanding of the material’s performance and their ability to resist corrosion. The influence of pH, solution resistivity, total dissolved solids, and aggressive ions on the electrochemical properties of rock bolt steel are discussed. This preliminary study focuses on understanding the corrosion potential, polarization resistance, and corrosion rates of the rock bolt steel that is most commonly used in US underground coal mines. Based on the findings, it was observed that the polarization resistance (Rp) is inversely proportional to the corrosion rate (CR) over time.
{"title":"Corrosion properties of ASTM A615 rock bolt steel in US underground coal mines","authors":"G. Bylapudi, K. Mondal, A. Spearing, A. Bhagwat","doi":"10.1080/25726668.2020.1788843","DOIUrl":"https://doi.org/10.1080/25726668.2020.1788843","url":null,"abstract":"ABSTRACT Corrosion of rock bolts is a relatively slow process yet a potential problem for the underground mining industry. Mine groundwater in the strata through natural or mining-induced cracks together with the humid environment in the mine openings interact with the roof support systems often resulting in corrosion. Electrochemical studies of the commonly used rock bolt steel in the coal mining environments will lead to a better understanding of the material’s performance and their ability to resist corrosion. The influence of pH, solution resistivity, total dissolved solids, and aggressive ions on the electrochemical properties of rock bolt steel are discussed. This preliminary study focuses on understanding the corrosion potential, polarization resistance, and corrosion rates of the rock bolt steel that is most commonly used in US underground coal mines. Based on the findings, it was observed that the polarization resistance (Rp) is inversely proportional to the corrosion rate (CR) over time.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"8 16 1","pages":"135 - 150"},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75584594","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 : 2020-07-02DOI: 10.1080/25726668.2020.1788885
Osvail André Quaglio, José Margarida da Silva, E. C. Rodovalho, A. O. B. Franco-Magalhães, Thaís Gontijo Pereira
ABSTRACT In quarries, rock blasting is important for mining and transportation, being the first step in the comminution. Discontinuities present in a rock mass can interrupt the propagation of the shock wave and evacuate gases, thereby reducing the efficiency of the explosives. Differences in the orientation of joint sets and the advancing direction of the mine produce different fragmentation results. In this study, the blastability of a rock mass was evaluated as a function of mining advance direction relative to the direction of the main joint set using particle size curves generated by photo-analysis. The data were analysed for each bench, and the optimal direction of advance was determined as the one to generate the smallest boulders. The particle size curves reveal optimal fragmentation when the mining direction is orthogonal to the main joint set, reducing the number of boulders by 64.40%.
{"title":"Influence of rock blast advance direction on boulder generation: a case study","authors":"Osvail André Quaglio, José Margarida da Silva, E. C. Rodovalho, A. O. B. Franco-Magalhães, Thaís Gontijo Pereira","doi":"10.1080/25726668.2020.1788885","DOIUrl":"https://doi.org/10.1080/25726668.2020.1788885","url":null,"abstract":"ABSTRACT In quarries, rock blasting is important for mining and transportation, being the first step in the comminution. Discontinuities present in a rock mass can interrupt the propagation of the shock wave and evacuate gases, thereby reducing the efficiency of the explosives. Differences in the orientation of joint sets and the advancing direction of the mine produce different fragmentation results. In this study, the blastability of a rock mass was evaluated as a function of mining advance direction relative to the direction of the main joint set using particle size curves generated by photo-analysis. The data were analysed for each bench, and the optimal direction of advance was determined as the one to generate the smallest boulders. The particle size curves reveal optimal fragmentation when the mining direction is orthogonal to the main joint set, reducing the number of boulders by 64.40%.","PeriodicalId":44166,"journal":{"name":"Mining Technology-Transactions of the Institutions of Mining and Metallurgy","volume":"46 1","pages":"113 - 119"},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74261766","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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