Journal of The South African Institute of Mining and Metallurgy最新文献_第7页

Maximum height estimation for mine waste dumps 矿山废料堆的最大高度估计

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-11-04 DOI: 10.17159/2411-9717/1947/2022

S. Chai

{"title":"Maximum height estimation for mine waste dumps","authors":"S. Chai","doi":"10.17159/2411-9717/1947/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1947/2022","url":null,"abstract":"Waste dumps are widely used to discharge stripped mine wastes in open pit mining methods. As mining progresses, the height of the waste dumps will increase gradually, which may induce sliding failure once the height exceeds a critical value. Therefore, estimation of the maximum dumping height is crucial to the life-cycle use of a waste dump. However, published information about the maximum height of mine waste dumps are extremely rare. In this study, the maximum dumping height is estimated based on the strength-reduction technique by numerical simulations. The influences of dump geometry and properties on the maximum height are investigated. The results show that the maximum dump height decreases as the dump slope inclination angle a or the unit weight of dump materials y increases, but decreases when the shear parameters of dump materials (cohesion c and internal friction angle 9) increase. The maximum height starts to increase with the ground inclination p when shear failure occurs at the interface between the dump and the base. Furthermore the effects of the dump width B, Young's modulus E, and Poisson's ratio u of dump materials on the maximum height are almost insignificant. Good agreement was found between numerical results available in the literature and those obtained in this study.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48063416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Application of MR and ANN in the prediction of the shovel cycle time, thereby improving the performance of the shovel-dumper operation - A case study MR和ANN在预测电铲循环时间中的应用，从而提高翻车机的运行性能——一个案例研究

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-11-04 DOI: 10.17159/2411-9717/1075/2022

S. Dey, S. Manda, C. Bhar

引用次数: 1

Water production as an option for utilizing closed underground mines 水生产是利用封闭地下矿井的一种选择

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-11-04 DOI: 10.17159/2411-9717/1439/2022

J. Dvofacek, P. Malíková, R. Sousedíková, S. Heviánková, P. Rys, I. Osickova

引用次数: 2

Towards a generalizable project readiness assessment methodology for the mining industry: A literature review 面向采矿业的可推广的项目准备评估方法:文献综述

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/1244/2022

H. Mulder, M. Bekker

引用次数: 0

Geological setting and concentration of scandium in the Flatreef and eastern limb chromitites of the Bushveld Complex Bushveld杂岩的Flatreef和东翼铬铁岩中钪的地质环境和浓度

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/1987/2022

E. Kotzé, F. Roelofse, D. Grobler, C. Gauert, M. Purchase

{"title":"Geological setting and concentration of scandium in the Flatreef and eastern limb chromitites of the Bushveld Complex","authors":"E. Kotzé, F. Roelofse, D. Grobler, C. Gauert, M. Purchase","doi":"10.17159/2411-9717/1987/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1987/2022","url":null,"abstract":"Scandium is an important industrial metal for which demand is projected to increase in the future. Although many Sc deposits are secondary, Sc is scavenged by clinopyroxene during fractional crystallization of primary, mafic-ultramafic magmas. Sc may thus occur in sub-economic concentrations in mafic-ultramafic intrusions. In this work, we present new data on the concentration of Sc in the Bushveld Complex (BC) of South Africa. The eastern and western limbs of the BC are considered to be largely pristine, primary magmatic deposits, whereas the northern limb shows evidence of large-scale, localized crustal contamination. Samples from the primary magmatic cumulates of the eastern limb, from the mineralized Flatreef of the northern limb, and from the crustal-contaminated Footwall Assimilation Zone (FAZ) of the Flatreef were analysed for Sc. Despite the FAZ containing abundant clinopyroxene, interpreted to have recrystallized from the original cumulates in the presence of melted sedimentary rocks, no significant differences are seen in the concentration of Sc compared to other cumulate rocks of the BC containing less-abundant clinopyroxene. The concentration of Sc in the analysed samples is mainly controlled by mineralogy, with anorthosites, chromitites, and harzburgites containing under 20 ppm, and norites and pyroxenites containing 20-40 ppm. The parapyroxenites of the FAZ are less enriched in Sc than expected, suggesting that Sc may have been lost during alteration and recrystallization.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42964999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Baleni v Minister of Mineral Resources: A fait accompli Baleni诉矿产资源部长：既成事实

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/1781/2022

K. Thambi

{"title":"Baleni v Minister of Mineral Resources: A fait accompli","authors":"K. Thambi","doi":"10.17159/2411-9717/1781/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1781/2022","url":null,"abstract":"The court in Baleni v Minister of Mineral Resources [2019] 2 SA 453 GP and [2020] 4 All SA 374 (GP), deliberated on the protection of rights of a community holding informal land tenure under Customary Law. The contention related to the necessary level of consent needed to acquire a mining right over such land. Moreover, whether consultations with such communities (Section 23, Mineral and Petroleum Resources Development Act 28 of 2002 (MPRDA) or consent (Section 2, Interim Protection of Informal Land Rights Act, No. 31 of 1996 (IPILRA)) was required to acquire such right. The case has a significant bearing on the granting of mining rights in South Africa, and the discretion of the Minister of Mineral Resources (the Minister) in this regard. However, the objectives of the MPRDA and IPILRA do not dovetail, therefore consultation and consent are not mutually exclusive (Tlale, 2020). This note argues that, despite the resounding victory of this case, the peripheral basis surrounding the decision and the various levels of engagement require serious deliberation. Equally, the degree of reliance on the IPILRA requires clarity to avoid aborting the fundamental objectives of the MPRDA. This paper provides considerations and recommendations that may reduce or eliminate the tensions between the statutory and socio-economic rights in the application of the two statutes.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46111200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of the stress state prior to excavation in an underground slate mine using flat jack and numerical methods 用平板千斤顶和数值方法确定地下板岩矿山开挖前应力状态

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/1916/2022

A. Alonso-Jiménez, M. Arlandi-Rodríguez, C. López-Jimeno, A. García-Berrocal

{"title":"Determination of the stress state prior to excavation in an underground slate mine using flat jack and numerical methods","authors":"A. Alonso-Jiménez, M. Arlandi-Rodríguez, C. López-Jimeno, A. García-Berrocal","doi":"10.17159/2411-9717/1916/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1916/2022","url":null,"abstract":"Spain is a major producer of dimension stone, which is one of the most important industrial sectors in the northwest of Spain. This justifies the maintenance of these industries, although the technical and environmental requirements for their continuity are increasingly demanding. The main target of this paper is to present a new methodology in order to obtain k-ratio stress values on the basis of flat jack measurements and finite element numerical back- analysis with Rocscience© RS2 software. Continuous iterations were performed to try to find a relationship between the k0 and the measured stress in the tunnel roof and sidewalls. It focuses on technical aspects of the method for designing mine chambers in the slate industry that were previously mined by open pit methods. The size of the chambers impacts the operating cost, and the dimensioning of a correct support ensures better efficiency and safety. Correct knowledge of the k0 therefore is critical for the design of the support. The proposed new method entails a simplification of the classical procedure for estimating the k-ratio.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47787405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Journal impact factors - The good, the bad, and the ugly 期刊影响因素-好的，坏的，丑的

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/1741/2022

D. F. Malan

{"title":"Journal impact factors - The good, the bad, and the ugly","authors":"D. F. Malan","doi":"10.17159/2411-9717/1741/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1741/2022","url":null,"abstract":"This paper provides an overview of the concepts of citations and journal impact factors, and the implications of these metrics for the Journal of the Southern African Institute of Mining and Metallurgy (JSAIMM). Two key research literature databases publish journal impact factors; namely, Web of Science and Scopus. Different equations are used to calculate journal impact factors and care should be exercised when comparing different journals. The JSAIMM has a low impact factor compared with some of the more prestigious journals. It nevertheless compares well with journals serving other mining sectors, such as the Canadian CIM Journal. The problems associated with journal impact factors are discussed. These include questionable editorial practices, the negative impact of this concept on good research, and the problem of a few highly cited papers distorting the journal impact factor. As a consequence, there is growing resistance to the use of journal impact factors to measure research excellence. The San Francisco Declaration on Research Assessment is a global movement striving for an alternative assessment of research quality. As a recommendation, the Editorial Board of the JSAIMM should adopt a pragmatic approach and not alter good journal policies simply to increase the journal impact factor. The focus should remain on publishing excellent quality papers. Marketing of the Journal, the quality of the published papers, and its open access policy should be used to counter the perception that journals with high impact factors are better options in which to publish good research material.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45181341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of rockburst energy capacity for the design of rock support systems for different tunnel geometries at El Teniente copper mine El Teniente铜矿不同巷道几何形状岩石支护系统设计中岩爆能量容量评价

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/1249/2022

F. Villalobos, S. Villalobos, L. Aguilera

{"title":"Evaluation of rockburst energy capacity for the design of rock support systems for different tunnel geometries at El Teniente copper mine","authors":"F. Villalobos, S. Villalobos, L. Aguilera","doi":"10.17159/2411-9717/1249/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1249/2022","url":null,"abstract":"Rockburst events have been a serious problem for many years in many mines worldwide, and in particular at El Teniente mine in Chile. El Teniente is the largest copper mine in the world, located in the Andes Cordillera where high stress levels are present due to intensing mining activity in addition to complex geology. Consequently, the study and management of the rockburst threat are necessary. In this work, the case of the Diablo Regimiento (DR) mine within El Teniente is studied. The energy capacity of dynamic support systems is determined for different tunnel geometries based on two kinetic methodologies, using data from DR. Initially, rockburst potential is determined by means of a stress analysis around different tunnel geometries through the boundary elements method. In the first methodology a yielding zone (YZ) is estimated for each excavation geometry using the finite element method FEM. The second methodology involves the definition and determination of a critical strain energy (SE) around each excavation geometry using a FEM numerical analysis. In both cases, peak particle velocity PPV is estimated by a scaling law, which is subsequently adjusted due to tunnel amplification effects. According to the results, and knowing the working energy capacity applied in DR mine, it was found that the values of energy capacity for the rock dynamic supports were better estimated by the YZ-PPV approach than by the SE approach.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48290968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Collaboration and Diversity in STEM STEM中的合作与多样性

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-10-31 DOI: 10.17159/2411-9717/2022/2022

Z. Botha

引用次数: 0