mining
در نشریات گروه مهندسی معدن-
The RFID technology has recently been embraced by many mining companies due to its unique capabilities in transforming mining operations. This technology has sparked a communication revolution within the mining industry. This article examines the RFID application in the ore exploitation sector and provides insights into RFID system, highlighting its potential to become a critical component in Iran's mining industry. Utilization of RFID in the mining industry include tracking miners and equipment, managing personal protective equipment (PPE), controlling access and worker safety, managing materials and the supply chain, monitoring environmental conditions and mine status, and tracking explosives. Given these practical features, implementing RFID technology in Iran's mines especially coal mines, which are prone to various incidents can help track personnel during an emergency, allowing rescue teams to be quickly dispatched to the site and significantly reduce casualties.
Keywords: RFID, Tracking, Mining, Technology, Monitoring -
معدن کاری در تمام جوامع معدنی یکی از فعالیت های اقتصادی بسیار مهم است که تاثیر قابل توجهی بر تولید ناخالص داخلی دارد. تامین انرژی برای بخش معدن کاری، بخش بزرگی از مصرف انرژی در تمام جوامع معدنی را به خود اختصاص داده و نه تنها برای فعالیت های معدنی بلکه به عنوان قلب بسیاری از صنایع از جمله حمل ونقل، ساخت وساز و تولید مواد و محصولات صنعتی اساسی است. با افزایش جمعیت جهان، تقاضا برای افزایش استفاده از مواد معدنی روبه رشد است و این افزایش تقاضا باعث افزایش مصرف انرژی در فعالیت های اکتشاف، استخراج، بهره برداری، فراوری، ذوب و پالایش مواد معدنی می شود. یکی از چالش های معدن کاری امروزی این است که بسیاری از معادن در مناطق دورافتاده و دور از مناطق شهری قرار دارند که این موضوع باعث افزایش وابستگی به منابع انرژی فسیلی شده است. با این حال، امکان استفاده از انرژی های تجدیدپذیر مانند انرژی خورشیدی و بادی در فعالیت های معدنی وجود دارد که می تواند به کاهش این وابستگی و تامین انرژی پایدار در این صنعت کمک کند. مقاله حاضر چالش ها، فرصت ها و تاثیرات انرژی های تجدیدپذیر بر شاخص های توسعه پایدار در فعالیت های معدنی را بررسی می کند. همچنین به ارایه برنامه و مدیریت استراتژیک استفاده از انرژی های تجدیدپذیر در معدن کاری با استفاده از روش SWOT پرداخته است. نتایج نشان داد که با وجود فرصت های زیادی که این فناوری ها در معدن کاری ایجاد می کنند، نیاز به مطالعات بیشتری برای معرفی و پیاده سازی آن ها وجود دارد. همچنین نتایج نشان داد که استفاده از انرژی های تجدیدپذیر در معدن کاری تاثیر مثبتی بر شاخص های توسعه پایدار دارد. از این رو، استراتژی تهاجمی (استفاده حداکثری از نقاط قوت برای بهره مندی حداکثری از فرصت های ایجاد شده) به عنوان یک راه حل پیشنهاد شده است که می تواند به تحقق اهداف توسعه پایدار در صنعت معدن کمک کند. به طورکلی، استفاده از انرژی های تجدیدپذیر در معدن کاری نه تنها به معدن ها کمک می کند تا منابع انرژی خود را تنوع بخشند، بلکه به افزایش کارایی و کاهش اثرات منفی بر محیط زیست کمک می کند. استفاده از این فناوری به نفع اقتصاد و جامعه است و می توانند به تحقق توسعه پایدار در صنعت معدنی کمک شایانی کند..کلید واژگان: انرژی تجدیدپذیر، معدن کاری، توسعه پایدار، مدیریت استراتژیک، SWOTIn all mining communities, mining is one of the major economic activities affecting the gross domestic product (GDP). Energy supply plays a vital role in numerous industries, including mining, transportation, construction, and industries. With the increase in the world population, the demand for minerals is growing, and this increase in demand causes an increase in energy consumption in the activities of exploration, extraction, exploitation, processing, smelting, and refining of minerals. One of the challenges of mining today is that many mines are located in remote areas and far from urban areas, which has increased the dependence of mining on fossil energy. However, using renewable energies such as solar and wind energy in mining activities is possible, which can help reduce this dependence and provide sustainable energy in this industry. This article examines renewable energy's challenges, opportunities, and effects on sustainable development indicators in mining activities. It has also provided a strategic management plan for using renewable energy in mining using the SWOT method. The results showed that despite the many opportunities that these technologies create in mining, there is a need for more studies to introduce and implement them. Also, the results showed that the use of renewable energy in mining has a positive effect on sustainable development indicators. Therefore, an aggressive strategy (maximizing the strengths to take maximum advantage of the created opportunities) is proposed as a solution that can help achieve sustainable development goals in the mining industry. In general, using renewable energy in mining not only helps mines diversify their energy sources but also helps increase efficiency and reduce negative effects on the environment. This technology benefits the economy and society and can help achieve sustainable development in the mining industryKeywords: Mining, Sustainable Development, Strategic Management, SWOT
-
The productivity of the quarry during the wet season heavily depends on how well the personnel adjusts to the mine's environmental conditions and management plans. The improvement of granite production through workers' impact identification and mining advancement decision-making in Ondo State, Nigeria, has been considered in this study. The rate of granite production and the factors influencing workers’ efficiency were assessed using a well-structured survey and descriptive-analytic technique. To improve the production rate, the Multiple Criteria Decision-Making (MCDM) technique was used to select the most productive pit depending on a number of key labor impact factors. Health and safety in employment, the energy crisis, market conditions and level of competition, on-site accidents, natural disasters, and language barriers were some of the factors identified as external influencer factors affecting mine labor efficiency in granite quarrying. Finally, using the criteria's significance through the inter-criterion (CRITIC) approach, the mine workers’ influence on production was estimated and utilized for the best pit selection. The result of the MCDM revealed that the five pits (Pit 1, Pit 2, Pit 3, Pit 4, and Pit 5) had the following decision performance scores: 0.659, 0.617, 0.5, 0.5, and 0.5, respectively. This made Pit 1 the best production pit to be considered during the rainy season. The optimal solution was validated with the 2021 production report. The report shows that production from Pit 1 had the highest revenue of $16,000 Per annum, the lowest dewatering cost, and the highest production rate compared to the other four pits.Keywords: mining, Production improvement, granite aggregate, TOPSIS score analysis, Decision-Making approach
-
Historical analysis of mining demonstrates that this profession is highly hazardous and has adverse effects on human health and the environment. The sensitivity of civil institutions and the obligation of governments to monitor and legislate indicate the high level of damage caused by mining activities to the miners' health. From a global perspective, mechanical, chemical, and biological hazards; risks arising from energy sources; physical pressure on workers; risks of falling from heights; and psychological hazards are major threats in mining activities.Artificial intelligence, Internet of Things (IoT), and drones can play an influential role in risk alerting to workers and implementing preventive measures by collecting and intelligently processing information. Moreover, technologies such as robotics, drones, and autonomous vehicles can replace humans in hazardous areas and reduce human casualties and injuries.Historical analysis of mining demonstrates that this profession is highly hazardous and has adverse effects on human health and the environment. The sensitivity of civil institutions and the obligation of governments to monitor and legislate indicate the high level of damage caused by mining activities to the miners' health. From a global perspective, mechanical, chemical, and biological hazards; risks arising from energy sources; physical pressure on workers; risks of falling from heights; and psychological hazards are major threats in mining activities.
Keywords: Sustainable, Mining, Hazards, Environment, Psychological -
Because of the limitations of manipulating single geophysical data sets to interpret subsurface anomalies for many cases, it is required to combine geophysical data to decrease the ambiguity and non-uniqueness of the interpretation. Integration interpretation of two different geophysical data sets is one of the most common ways to integrate geophysical data and in this paper, we want to utilize the combination of gravity and magnetic data for the Golgohar mine in Iran. This mining case is located in the Sanandaj-Sirjan zone in the province of Kerman. Gravity and magnetic data are interpreted using a MATLAB code written based on the damped weighted minimum length solution for which the model weighting is the product of the multiplying of compactness and depth weighting constraints. At first, the inversion algorithm is applied to the synthetic case to investigate its reliability for practical application on real data. Reconstructed models from the noise-contaminated synthetic data are suggestive of the productivity of the inversion algorithm. Ultimately, the algorithm is applied for the interpretation of the real data and the inversion results of both data sets show a high correlation between the magnetite anomaly position horizontally and vertically. The results represent an anomaly with the depth ranging approximately from 25 to 130 m with the horizontal extension of about 120 m from 280 to 400 m relative to the start of the interesting profile.Keywords: Gravity, inversion, Integration Interpretation, magnetic, mining
-
Mining design is a key part of the mining life cycle and the integration of sustainable development (SD) considerations makes the project a profitable activity with the least adverse social and environmental impacts. Applying sustainability considerations in the very late stages of project development and focusing on impact mitigation and control measures has been one of the most important reasons for not integrating the principles of SD in the feasibility and design stages of projects. In this study, the attributes of the three principles of SD discussed in various studies were collected and a logical approach was adopted to identify the social and environmental attributes effective in the design, optimization, and selection of the ultimate pit limit (UPL). Then, political-security problems, creation of employment, pollution of underground/surface waters, acidic depositions, materials existed in the tailings dam, soil physical specifications, the recycle/removal of waste, restore habitat post-mining, tailing dams and waste dumps and respect of sensitive areas was selected for quantification and integration in the sustainable design of the Songun copper mine as a case study.
Keywords: Mining, sustainable development, economic, social, Environmental -
The purpose of this study is to note the influence of coal on environmental pollution and introduce solutions for the removal of this pollutions. Environmental problems caused by coal production and use can be improved or efficiently addresses during processing, recovery, conversion, or reclamation. Coal is a dominant primary source of chemical energy and the production of power and the major source of greenhouse gases and air pollutants. The demand for these coal products is rising throughout the world. This demand in traditional markets is rising steadily. Coal is very important for the development of countries; therefore, effective use is vital for energy-poor countries. If the negative effects (or impacts) of coal on the environment are handled successfully, it can have a bright future. Clean coal technologies (CCT) are needed to utilize coal in an environmentally acceptable way and to improve coal utilization efficiency. Clean coal technology (CCT) is the main issue to maintain a clean environment and economically viable way. Carbon sequestration and electrostatic and fabric filters are the other techniques control techniques for pollution of coal mining.
Keywords: Coal, Mining, Acid mine drainage (AMD), Clean Coal technologies (CCT), Mine drainage management -
تخمین عمر باقیمانده ماشین آلات در بخش معدنکاری برای حصول اطمینان از تولید و رضایتمندی مشتری از محصول امری ضروری است و از آن با عنوان عمر باقیمانده مفید (RUL) یاد میشود. این معیار براساس قابلیت اطمینان محاسبه شده که متاثر از شرایط محیطی است. تاثیرات شرایط محیطی نیز با عنوان "فاکتورهای ریسک" در تحلیل ها وارد میشوند. در این مقاله رویکردی پیشنهاد شده است که براساس آن نخست قابلیت اطمینان سیستم با توجه به تاثیر فاکتورهای ریسک بررسی و سپس RUL برای حالات مختلف تخمین زده میشود. همچنین عمر باقیمانده مفید یک دستگاه بیل مکانیکی کوماتسو1250- PC از معدن مس سونگون به عنوان مطالعه موردی با این رویکرد ارزیابی شد. در نتیجه ارزیابی، بر مدل نرخ مخاطرات متناسب ویبول برای توصیف رفتار خرابی برازش شده و عمر مفید برای چهار سناریوی تصادفی محاسبه شد. نتایج به دست آمده در این تحقیق را میتوان برای توسعه، برنامه ریزی، نگهداری وتعمیرات پیشگیرانه، نگهداری وتعمیرات مبتنی بر شرایط، تخمین بازه های تعویض قطعات یدکی استفاده کرد.
کلید واژگان: قابلیت اطمینان، فاکتور ریسک، عمر باقیمانده مفید، فرض متناسب بودن، معدنکاریThe Remaining Useful Life (RUL) valuation of mining machinery is a principal to ensure the production/output and customer satisfaction in the mining zone. In many cases, it may be of attention to know the expected value of the remaining life of the item before it fails from an arbitrary time that known RUL. The system's failure is also evaluated with the reliability index, which describes up-times. An individual unit's reliability during field use is essential in many mining equipment applications. This index, especially in industrial systems, and being affected by the internal condition also affects operating environmental conditions. For example, the loader performance in cold weather will be different from that of warm, which will affect the machine's reliability and thus the RUL. In reliability engineering, operating environmental conditions are considered "Risk factors or Covariates". Therefore, in this paper, an approach is proposed first to analyze the system's reliability considering covariates' effect and then estimate the RUL for different scenarios. The proportional hazard model was used in reliability analysis to be realistic and take the operational influencing factors in calculation. Methods are presented for calculating the reliability function and computing the RUL as a function of the current conditions to guarantee the desired output. The remaining useful life estimation of a Komatsu PC-1250 from the Sungun copper mine was evaluated as a case study of this approach. Systems operating environmental factors such as shift, dump-truck kind, rock kind, … (known as covariates) are assumed to influence covariate in this context. As a result, the Weibull proportional hazard model was fitted to describe the failure behavior, and the RUL of four selected scenarios was evaluated. Presented results can be used, e.g., for developing operational performance, planning of maintenance activities, spare parts provision, and the profitability of the owner of an asset.
Keywords: Reliability, Covariates, Remaining useful life, Proportional hazard assumption, Mining -
International Journal of Mining & Geo-Engineering, Volume:55 Issue: 2, Summer-Autumn 2021, PP 151 -156In recent years, using of the resilience concept has been increased in order to evaluate the response of systems against the failures. Resilience depicts the system ability to return to its normal operational status after failure accruing. According to the literature survey, there are various studies, which have been done in the field of engineering and non-engineering systems, and there is no study about applying resilience concept in the field of mining industry. In this paper, at first, resilience concept has been introduced and then the resilience of the mining fleet of Sungun copper mine has been estimated. Systems performance indicators include reliability; maintainability and supportability have been used in order to resilience estimation. The results showed that the resilience of the entire system for one hour of its function is equal to 83.1% and this value decreases to 37.1% after 10 hours. This means if there is a failure in the system; it will have 83.1% and 37.1% probabilities to be resilience against the failure event after 1 hour and 10 hours of system function.Keywords: maintainability, mining, reliability, resilience, Supportability
-
توده سنگ ساختمانی ترکیبی از سنگ و شبکه ناپیوستگی ها است. تقاطع ناپیوستگی ها، بلوک های سنگی با ابعاد متفاوت در این مجموعه ایجاد می کند. تعیین مشخصات هندسی بلوک های تشکیل شده در توده سنگ لازمه ارزیابی اقتصادی بودن ذخایره سنگ تزیینی است. از طرفی استخراج سنگ با صفحات برش انجام می شود و بهینه کردن الگو صفحات برشی برای استخراج بلوک های سنگی باعث افزایش بهر وری و کاهش باطله های ایجاد شده در معدن می شود. این عملیات موجب کاهش اثرات زیست محیطی و افزایش منافع اقتصادی خواهد شد. در این پژوهش، ابتدا خصوصیات مهم ناپیوستگی ها نظیر تداوم، فاصله داری، جهت یافتگی و... در معدن سنگ ساختمانی کپیول برداشت شده است. سپس با استفاده از نرم افزار 3DEC مدل بلوکی معدن ساخته شده و با استفاده از مدل سازی بلوکی، چرخش آزیموت درزه های مختلف در چهار کلاس بررسی شدند. با تحلیل نتایج بدست آمده از مدل سازی نشان داد که برای کسب بیشترین کوپ دهی، جهت راستای (امتداد) استخراج فعلی باید 70 درجه به طرف غرب تغییر کند که در اثر اعمال آن، میانگین حجم بلوک های برجا 45/287 متر مکعب و میزان کوپ های قابل فروش در چهار کلاس 27/65826 متر مکعب حاصل می شود که براساس نرخ موجود منجر به درآمد حدود 115میلیارد و98 میلیون تومان برای این معدن خواهد شد.
کلید واژگان: معادن سنگ های ساختمانی، نرم افزار 3DEC، بهینه سازی کوپ دهی، معدنکاری، تحلیل ناپیوستگیDimension stone reserves contains intact rock and discontinuity network. The intersection between discontinuities forms rock blocks with various geometry. Determination of rock blocks geometry is required in order to economical evaluation of stone reserves. Beside, extraction of stone blocks are preform by cutting planes, and the optimization of cutting pattern leads to increasing quarrying efficiency and decreasing production of waste in quarries. This procedure result less environmental damages and more economical beneficiations. The operation will reduce environmental impacts and increase economic interests. In this research, first, important features of discontinuities such as persistence, spacing, orientation, etc. have been extracted in the Kipul Quarry stone mine. then, using 3DEC simulation of the block model and using block modeling, different joint azimuth rotation was investigated in four classes. analyzing the results obtained from the modeling showed that in order to obtain maximum value, the current extraction direction must be 70 degrees west, which resulted in an average in situ block of 287.58cubic meters and the amount of coups sold in four classes 65826.27 cubic meters, which according to the current rate will generate about 115 billion and 98 million USD for this mine.
Keywords: stone construction quarries, software 3DEC, couping optimization, Analysis of discontinuities, Mining -
Sierra Leone is blessed with abundant natural resources but yet prone to environmental degradation due to the mining operations. Most often, the mining communities are faced with social tensions, as a result of the possible trade-off between the expected employment impact and the cost of mining operations to the environment. Over the past decades, the contribution of the mining sector to the development of the country has been overshadowed by the fact that the mining operations have had adverse negative effects, mainly due to the country's weak environmental policies and the failure of the mine monitoring institutions, to supervise the operations of mining company operations. This article seeks to examine both the environmental and the social implication of mining operations on three mining edge communities in Sierra Leone. This paper also utilizes secondary data from the published articles, government’s reports, workshops and conference proceedings, policy documents of non-governmental organizations, newspapers, and the like to generate this writer's view on the topic under review. The thrust of the review will be on the following: Sierra Rutile Limited, Koidu Holdings Limited, and Shandong Iron Ore Mines. The above mining companies have been carefully selected due to the fact that they are located close to dwelling communities, and have been mining in Sierra Leone over a long period of time. The environmental performance index and the mining impact framework are used to clearly show the impact of mining operations on the environment in Sierra Leone. As a result of mining operations, deforestation is skyrocketing, public discomfort and air pollution has worsened, and social unrest has increased as a result of some unacceptable consequences including pollution of water source without recourse to short-term remedy. The literature reviewed by this writer reveals that the mining activities have two faces in Sierra Leone. One is that it serves as a resource curse. An example to this sad reality is the outbreak of civil war, social unrest among others. On the other hand, the mining sector is one of the principal backbones of the economy. It contributes to the livelihood of the country. This paper introduces three-way approaches of mining sector operation remedies that include but not limited to: 1) sound Environmental Impact Assessment (EIA) adoption before mining operations starts; 2) carrying out Strategic Environmental Assessment (SEA); 3) regular engagement with all stakeholders of mining-affected communities. This article recommends that restoration activities by mining companies go along with extraction and adequate compensation.
Keywords: Mining, environmental, degradation, Sierra Leone, Artisanal mining -
اشتغالزایی یکی از تاثیرات مهم اجتماعی معدنکاری است که از جنبه های مختلفی مورد توجه است. تعداد شغل جدید ایجاد شده، مدت اشتغال، کسب مهارت جهت اشتغال در معادن دیگر و مدت کار در شرایط نامناسب (بعضا معادن زیرزمینی) می تواند از ویژگی های اشتغالزایی ایجاد شده به واسطه معدنکاری در منطقه باشد. علاوه بر موارد گفته شده معدنکاری تاثیرات اجتماعی مثبتی نظیر ایجاد تسهیلات رفاهی و بهبود وضعیت معیشت مردم منطقه و تاثیرات منفی از قبیل ایجاد ناهنجاری های اجتماعی و بر هم خوردن توازن جنسیتی را دارد. تاکنون تحقیقات زیادی در مورد تاثیرات اقتصادی و زیست محیطی معدنکاری انجام شده و معیار سوم توسعه پایدار که اجتماع است، مغفول مانده است. در مقاله حاضر از روش "آزمون انتخاب" که روشی جدید از رویکرد "ترجیحات بیان شده" می باشد، برای برآورد ارزش تاثیرات اجتماعی معدنکاری استفاده شده است. در این پژوهش تاثیرات اجتماعی معدنکاری در دو بخش اشتغالزایی و سایر تاثیرات اجتماعی معدنکاری بررسی شده است. برای این کار پرسشنامه ای تهیه و نتایج 780 پاسخ برای هر بخش پس از کد بندی وارد نرم افزار STATA شده و الگوی متناسب با آن و ترجیحات پاسخ دهندگان با توجه به ضرایب و نتایج الگو به دست آمده است. بر اساس نتایج حاصل از برآورد الگوی لاجیت شرطی در هر دو بخش اشتغالزایی و سایر تاثیرات اجتماعی معدنکاری، آماره نسبت لاگرانژ برای معنی داری کل رگرسیون با توزیع مربع کای در سطح یک درصد کاملا معنی دار است که نشان دهنده معنی داری کل رگرسیون برای مدل می باشد. همچنین با توجه به نتایج این تحقیق می توان گفت برای افراد پاسخگو تعداد شغل و مطلوبیت وضعیت معیشت بیشترین ارزش را دارد و برای کسب مهارت حاضرند مدت بیشتری در شرایط نامناسب کار کنند به شرطی که این شرایط منجر به ایجاد ناهنجاری اجتماعی در محل زندگی آنها نشود.کلید واژگان: معدنکاری، توسعه پایدار، آزمون انتخاب، لاجیت شرطیJob creation is one of the important social impacts of mining, which is considered in many aspects. The number of new jobs created, the duration of employment, the acquisition of skills for employment in other mines and the duration of work in inappropriate conditions (sometimes underground mines) can be attributed to the job creation opportunities created by mining in the region. In addition to the above mentioned, mining has positive social impacts such as creating welfare facilities and improving the livelihoods of the people of the region and negative impacts, such as the creation of social anomalies and the collapse of gender balance. So far, much research has been done on the economic and environmental impacts of mining, and the third criterion of sustainable development, which is a community, has been neglected. In this paper, the "choice experiment" method, a new method of "stated preferences" approach, has been used to estimate the value of social impacts of mining. In this study, the social impacts of mining on two parts of employment and other social impacts of mining have been investigated. For this purpose, a questionnaire was prepared and the results of 780 responses for each section after encoding were entered into the STATA software and its appropriate pattern and respondents preferences according to the coefficients and pattern results. Based on the results of estimating conditional logit in both section, Lagrange's ratio is statistically significant which shows a significant regression for the model. Also, according to the results of this research, it can be said that for respondents, the number of jobs and desirability of the livelihood is the highest value and they are ready to work longer in inappropriate conditions, provided that these conditions do not lead to social anomalies in their place of residence.Keywords: Mining, Sustainable development, Choice Experiment, conditional logit
-
Mining is among the oldest industries. It is the primary source of raw materials for most of the sectors. Little is known about the complex inter-sectoral carbon linkages of the mining industry. In this work, we estimate the inter- and intra-sectoral carbon linkage impacts of the mining sector across ten major economies by applying an input-output model, and the hypothetical extraction method and its modified version. The hypothetical extraction method removes an industrial block from an economic system, and afterwards, it makes a comparison between the before and after removal values. China with 195.47 Mt has the highest mining emissions, followed by USA, India, and Canada with 110.99 Mt, 108.79 Mt, and 76.92 Mt, respectively. The India’s mining sector with 26.33 t/104</sup> $ is the most carbon-intensive, followed by Japan and Canada with 6.84 t/104</sup> $ and 5.22 t/104</sup> $, respectively. China’s carbon emissions with -11.56% and -11.28%, respectively, have been affected the most by the total extraction of mining sector and forward carbon linkages, while for the backward carbon linkage, Canada with -1.33% has been affected the most. Canada has the highest mixed and internal emissions of 0.42 Mt and 47.88 Mt, respectively. However, China has the highest net-backward and net-forward emissions of 16.91 Mt and 189.22 Mt, respectively. For all nations, the mining sector is a net exporter of emissions to other industries. Based on the numerical findings, in this work, we discuss the mitigation measures for both the direct and indirect mining emissions.
Keywords: Environment, Mining, Quarrying, Carbon Emissions, Input-Output Model, Hypothetical Extraction Model -
بخش معدن و صنایع معدنی از مهم ترین مسیرها در دستیابی به توسعه پایدار است. منابع معدنی نقش چشم گیری در پویایی اقتصاد کشور داشته و با سرمایه گذاری صحیح در بهره برداری از این منابع، امکان کسب ارزش افزوده مناسب در بخش های مختلف اقتصادی وجود دارد. بنابراین، تعیین مزیت های نسبی و اولویت بندی بهره برداری از فعالیت های معدنی به منظور اطمینان در سرمایه گذاری های آینده ضرورت دارد. در این مقاله، به اولویت بندی بهره برداری از منابع معدنی استان آذربایجان غربی، به عنوان یکی از استان های مهم معدنی کشور پرداخته شده است. برای این منظور، از روش های تصمیم گیری چندمعیاره در محیط فازی استفاده شده است. با توجه به نتایج، مسائل زیست محیطی و فرهنگی- اجتماعی از مهم ترین شاخص ها در بهره بردای از معادن استان آذربایجان غربی هستند. از این رو، استخراج سنگ آهن و طلا، کرومیت، منگنز و سرب و روی به ترتیب بالاترین اولویت در بهره برداری را دارند. علاوه بر این، سنگ های تزئینی، نما و سنگ گچ، باریت و خاک سرخ و زرد، کائولن، خاک نسوز و دولومیت به ترتیب در اولویت های دیگر استخراج قرار می گیرند.
کلید واژگان: منابع معدنی، معدنکاری، آذربایجان غربی، تصمیم گیری چندمعیاره فازیJournal of Aalytical and Numerical Methods in Mining Engineering, Volume:9 Issue: 19, 2019, PP 121 -133Mines and mining industries are an important way to reach the sustainable development and investing in these sectors creates the suitable economics value added. Therefore, prioritization of the mineral activities are helpful for persuasion of future investments. The main aim of this research is to rank the mining activities of the Azerbaijan-e-Gharbi Province in Iran with considering five main criteria including economic, cultural and social, environmental, technical and also political criteria.
Methodology and ApproachesIn this study, the main in-operation mines are considered. The technique for order of preference by similarity to ideal solution and also the analytical hierarchy process are used to prioritize the mining activities. To reduce the uncertainties, all calculations are done under the fuzzy environment. Results and
ConclusionsResults of this study show that, the cultural, social and environmental criteria have the highest importance degree in comparison to the other criteria. The iron and gold mines are in the first priority, while the chromic and manganese mines and lead and zinc mines are respectively in the second and third priority. The quarry and gypsum mineral types, the barite, red and yellow soil, kaolin, fireclay and dolomite, salt and silica, sand, rubble, mica, limestone and ballast mines are respectively ranked.
Keywords: Mineral Resources, Mining, Azerbaijan-e-Gharbi, Fuzzy MCDM -
در صنعتی مانند صنعت معدنکاری با محیط سخت و خشن نمی توان از تاثیر شرایط محیطی بر رفتار سیستم ها صرف نظر کرد، چرا که این موضوع اریبی شدید در نتایج تحلیل ها را به دنبال خواهد داشت. با این دیدگاه در این پژوهش تلاش شد تا قابلیت اطمینان سیستم لودر از معدن مولیبدن- مس آذربایجان با استفاده از نوعی مدل رگرسیونی معروف به مدل نرخ مخاطرات متناسب محاسبه شود. این مدل از دو تابع یکی بر اساس داده های زمانی و دیگری شامل شرایط محیطی (فاکتورهای ریسک) هست. داده های مورد نیاز از بانک داده 15 ماهه از منابع مختلف چون گزارش های روزانه، تعمیرگاه، گزارش های هواشناسی، ملاقات و مشاهده های مستقیم و مرتب شده بر اساس تاریخ وقوع در قالب زمان بین خرابی ها و فاکتورهای ریسک استخراج گردید. در نخستین گام برای تعیین تابع پایه نرخ مخاطره، آزمون های روند و خودهمبستگی برای ارزیابی فرض توزیع یکسان و مستقل داده ها مورد استفاده قرارگرفته و در نتیجه آن فرض رد شد. لذا روش های کلاسیک آماری برای تحلیل نامناسب بوده و مدل فرایند قانون توانی جهت تحلیل سیستم تعمیرپذیر مناسب است. در مرحله بعدی نیز ضرایب رگرسیون برای فاکتورهای ریسک با سطح تاثیر معناداری مشخص و با به کارگیری روش بازگشتی انجام گرفت. طبق نتایج حاصل از تحلیل فاکتورهای نوبت، محل کار، تناسب با دامپتراک، وضعیت آب و هوا، دمای محیط و وضعیت جاده دارای تاثیر معناداری بودند. در نتیجه آن قابلیت اطمینان لودر بر اساس تابع زمانی و شش فاکتور ریسک محاسبه شد. در نهایت نیز اختلاف حدودا سه برابری بهره وری برای دو حالت تحلیل قابلیت اطمینان با در نظرگیری فاکتورهای ریسک و بدون آنها به دست آمد.کلید واژگان: معدنکاری، قابلیت اطمینان، فاکتورهای ریسک، مدل نرخ مخاطرات متناسبJournal of Aalytical and Numerical Methods in Mining Engineering, Volume:9 Issue: 18, 2019, PP 129 -141Summary
The proportional hazards model (PHM) that is a regression model was used to analyze the reliability of Komatsu 988 wheel loader system at Azerbaijan Molybdenum-Copper mine (Sungun Copper mine). Hazard rate in a system in PHM is the product of an arbitrary and unspecified baseline hazard rate, depending on time only, and a positive functional term, basically independent of time, incorporating the effects risk factors (covariates). The required data for PHM analysis were extracted from a database of 15 months, which collecting from different sources, such as daily reports, workshop reports, weather reports, meetings, and direct observations in format of time between failures and risk factors. At the first step, trend and serial correlation tests were used for evaluation of assumptions of independent and uniform distribution of data for determining base function of risk rate. The evaluation failed to show independency and uniform distribution. Therefore, power law process was used. In the next step, the regression coefficient of covariates were estimated. According to the results, shift, working place, proportionality of truck, weather conditions, temperature and road conditions have had a significant effect. Finally, the reliability of loaders based on the time and six risk factors was calculated, and analysis showed about three times alteration in productivity of analysis with the ignoring of risk factors compared with inserting them.IntroductionThe formal definition of reliability performance is ‘‘the ability of an item to perform a required function under given conditions for a given time interval’’. The ‘‘given conditions’’ are important keywords in the definition of the reliability performance concept and its related concepts. Given conditions can be such as the surrounding environment, conditions indicating parameters, the operating history of a machine, the skill of the operator or maintenance crew, etc. Thus, it is important that the statistical approach, which is used for reliability analysis, should be able to model the operational environment effect as the way it influences the failure process. There is a need for a careful and well-structured approach, access to all data and information, design and analysis tools, as well as effective design routines and procedures.Methodology and ApproachesThe aim of this paper is to assess the different operating environment conditions and their effect on the reliability as the two main goals. PHM was proposed in order to predict hazard rate and reliability considering the operating environment condition.Results and ConclusionsThe stated points in this section can be classified as follows:
The common parametric methods were reviewed
PHM for analyzing covariates is discussed
The application of this method is demonstrated using a real case study
The reliability analysis showed about three times alteration in productivity of analysis with the ignoring of risk factors compared with inserting them.Keywords: Mining, Reliability, Risk Factors (covariates), Proportional Hazards Model (PHM) -
مدیریت قطعات یدکی و تدارکات، وجهی از مدیریت پشتیبانی محصولات و موثر در هزینه چرخه عمر محصول است. دسترسی به قطعات یدکی به هنگام تقاضا، زمان افت سیستم/ماشین را کاهش داده و کارایی آن را افزایش و در نتیجه سود حاصله از کل پروژه را افزایش خواهد داد. در صورت ذخیره تعداد بهینه قطعات یدکی در انبار، هزینه های چرخه عمر محصول به عنوان تابع هدف، کمینه خواهد شد. تعداد بهینه قطعات یدکی را نیز می توان با وارد نمودن عوامل مختلف مانند تعداد وقوع خرابی، تعداد تجهیزات موجود، حساسیت قطعه، هزینه های خرید قطعه، فاصله بین تولیدکننده تا مصرف کننده و زمان های تاخیر بین تصمیم تا اجرا تعیین کرد. تخمین قطعات یدکی مورد نیاز بر اساس ویژگی های فنی و کارکردی سیستم و اجزاء یکی از موثرترین راه ها برای بهینه سازی توقفات ناخواسته است. از این رو در این مقاله رویکرد پیش بینی قطعات یدکی مورد نیاز بر اساس قابلیت اطمینان پیشنهاد شده است. در این رویکرد نخست قابلیت اطمینان جزء، بر اساس داده های خرابی تعیین شده و سپس تعداد قطعات یدکی موردنیاز، میزان سفارش بهینه و زمان ارسال سفارش بر اساس مصرف سالیانه محاسبه خواهد شد. همچنین به منظور کاربرد اجرایی رویکرد پیشنهادی مطالعه موردی از معدن مس سونگون بررسی شده است.کلید واژگان: معدنکاری، قابلیت اطمینان، قطعات یدکی، تایر، معدن مس سونگونJournal of Aalytical and Numerical Methods in Mining Engineering, Volume:8 Issue: 15, 2018, PP 25 -38Spare parts management and logistics is an aspect of product support management which influences the product life cycle cost. The availability of spare parts upon demand decreases the product down-time and increases the utilization of the system/machine and consequently the profitability of the project. If the optimum number of spare parts is stored in the inventory, this minimizes the product life cycle cost as a goal function, and the optimum number is calculated taking different factors into account, such as the part criticality, the part purchasing cost, the distance between the manufacturer and user, and the lead time. Forecasting the required support/spare parts based on technical and operational characteristics of a system, is the one of the best ways for optimizing unplanned stoppages. This paper discusses about product support (required spare part) logistics based on product design characteristics (reliability). In first step, the reliability of component was analyzed and then required spare parts, the economic order quantity and reorder point with respect to annual demand rate was calculated. A case study of Sungun Copper Mine is used to demonstrate how the proposed approach can be applied.Keywords: Mining, Reliability, Spare parts, Tire, Sungun Copper Mine
-
The focus of this research work is on the determination of the impact of mining on the groundwater quality in the historical mining region of SW Ashanti region in Ghana. This work describes the characteristics of the groundwater chemistry and pollution of the aquifer in the gold-ore bearing formation, which is highly weathered and fractured. The fractures control the permeability and depth of the groundwater within the studied area. The concentrations of the major ions and trace elements (As, Fe, Cu, Mn, and Zn) present are determined in 63 groundwater wells at dry and wet seasons. The results obtained showed that the concentrations of these ions and elements were below the World Health Organization (WHO) guideline values for drinking water. However, concentrations of the As and Fe ions were very high above the guideline values. The wells with high As and Fe concentration levels might be located at an apparent rock fractured zone that extends to a nearby mine. Such fractured zones allow groundwater to move more rapidly away from a mine, creating more severe mine-drainage pollution in their paths. The results obtained from this study suggested a possible risk to the population of the studied area, given the toxicities of the As and Fe ions, and the fact that for many people living in the studied area, groundwater is a main source of their water supply.Keywords: Gold deposits, Mining, Groundwater, trace elements, SW Ashanti
-
Theoretical review of ‘mining pit lakes’ indicates that like natural lakes such lakes display a huge diversity. They are typically in a non-equilibrium state with respect to their surroundings. Hence, at the decommissioning phase of mining operation a detailed technical study are required on different aspects of such created water bodies considering its morphometry, geology, hydrology, water quality (geo-chemistry), rate of filling, and biology. Pit lakes has their value as resources for miscellaneous purposes e.g. recreation, fisheries, water supply, and wildlife habitat which is dependent mostly on their topography, location water use and safety characteristics. Internationally, pit lakes as self sustaining aquatic ecosystems have been developed in the past e.g. Alberata Pit Lake in Canada [1, 2]; Sleeper pit lake [3] and Westfield pit lake, Scotland [4]. In Indian mining industry neither scientific studies nor case record of mining pit lake development are available because ‘closure plans’ are introduced recently. One such attempt in India at Kerendari coal mine in Jharkhand state is a laudable and new attempt which is at the stage of planning. In brief, since the opportunities for development of ‘mining pit lakes’ are immense and company owning it can nurture their ecological and commercial benefits appropriately, this review will be practically useful particularly in those countries which has less number of age old surface mines heading towards the decommissioning phase. The review done here can be practically utilized for evaluation, assessment, new project clearances and statuary compliance purposes.Keywords: pit lakes, mining, coal mining, end use of mining, mine closure plan
-
Hydrographically Bolivian Poopó Lake is located in the basin of Desaguadero River and it has over a dozen main tributary rivers and other smaller rivers with lower flow. The mine water discharge from the abandoned and current mining activities polluted these rivers by carrying heavy metals, dissolved and suspended solids which in turn polluted the Poopó Lake which is considered as an important Lake in this area. The present paper deals with the environmental hazards associated with the mining activities with an objective of determining the environmental quality of the Poopó Lake and its tributary rivers, based on physical-chemical analysis of superficial water and sediment samples. The results of the research show that the Poopó Lake water quality can be classified as highly saline, containing high concentration of dissolved or suspended solid, as well arsenic, lead, cadmium, zinc and other heavy metals exceeding the permissible limits of pollutants. Desaguadero River contributed to the Poopó Lake pollution by 70% arsenic, 64% lead, 4.27% zinc and 2.18% cadmium. Other important pollution contributors are Antequera River by 57 % zinc, 32.9 % cadmium and 0.66% lead, and Huanuni River by 61.2% cadmium, 2.23% lead and 34.3% zinc. Vinto foundry, Kori kollo mine and mainly San José mine polluted the Poopó Lake by arsenic and lead through Desaguadero River. Bolivar and Huanuni mines polluted the Poopó Lake by cadmium and zinc through Antequera and Huanuni Rivers. Additionally the mining activities continue to pollute the Poopó Lake by dissolved and suspended solids transporting through Desaguadero, Antequera and Huanuni rivers.Keywords: Lake, mining, environmental, pollution, heavy metal, dissolved, suspended solids
-
معدن کاری ذغال سنگ، تعادل ژئوشیمیایی اولیه واحدهای سنگی را بر هم می زند و با تغییریافتن شرایط اکسیداسیون محیط، عناصر موجود در لایه های ذغالی و سنگ های دربرگیرنده آن ها آزاد شده و وارد محیط می گردند. دراین تحقیق، به بررسی اثرات معدن کاری ذغال سنگ در مجموعه معدنی طزره (تونل مادر)، واقع در 70 کیلومتری شمال غرب شهرستان شاهرود پرداخته شده است. به این منظور با تعیین غلظت عناصر As، S، Cu، Fe،Hg، Sb، Pb، Zn، Sr و Se در منابع آبی، باطله ها و ذغال سنگ های استخراج شده از تونل مادر مجموعه معدنی طزره، نحوه گسترش این عناصر در آب های زیرزمینی منطقه بررسی شده است. ذغال سنگ منطقه فاکتورهای غنی شدگی بسیار بالایی را برای عناصر مس، سرب، آرسنیک، جیوه و سلنیوم (به ترتیب: 55/22، 01/77، 86/17، 64/44، 95/61 و 4/468) نشان می دهد. این در حالی است که باطله های ذغال و سینه کار، غنی شدگی بسیار کمتری نسبت به ذغال سنگ منطقه برای عناصر فوق نشان می دهند. بررسی همبستگی عناصر حاکی از این است که همبستگی های بالایی نیز بین آهن و سرب (929/0) و نیز روی با جیوه (980/0) وجود دارد. با توجه به وجود زهاب های قلیایی طبیعی یا NAMD (Natural Alkalin Mine Drainage) با pH برابر 6/7 در منطقه، عناصر سنگین با غلظت های بسیار پایین در زهاب خروجی تونل مشاهده گردید. این غلظت ها برای برای عناصر Cu و Sr به ترتیب 1/3 و 2501 ppb بود و برای عناصر Pb، Zn، Fe، As، Sb، Hg و Se میزان غلظت کمتر از حد اندازه گیری دستگاه ثبت گردید. با این وجود، معدن کاری باعث افزایش چشمگیر در غلظت عناصر گوگرد، استرانسیوم، مس، آرسنیک و سلنیوم که غلظت آن ها در آب زیرزمینی پایین دست منطقه به ترتیب 430000، 8505، 7/3، 5/1 و 3 ppb بود، گردیده است، به طوری که گوگرد با افزایش 4/9 برابری، بیشترین افزایش را در آب های زیرزمینی پایین دست معدن کاری نسبت به آب های بالا دست نشان می دهد.
کلید واژگان: ذغال سنگ، معدن کاری، آلودگی، فلزات سنگین، NAMD، آب زیرزمینی، طزرهCoal mining changes the original geochemical equilibrium of rock bodies and by changing the oxidantion condition of the area; it may cause the release of elements from the coal and ambient rocks into the environment. In the present study, the effects of mining activities in Tazareh Mine Complex, located on 70km North West of Shahrood, were investigated. Concentrations of As, S, Cu, Fe, Hg, Sb, Pb, Zn, Sr and Se in the water resources, tailings and the coals excavated from the main tunnel of the mine were determined to find out the distribution of these elements in the groundwater. The coal in this region shows a high value of enrichment factor for Cu, Pb, As, Hg and Se (22.55, 77.01, 17.86, 44.64, 61.95, and 486.40, respectively). The tailing and face have much less enrichment factor for the above mentioned elements compared and the coal in the region. In terms of correlation among the elements, high correlations between Fe and Pb (0.929) and also Zn and Hg (0.980) were detected. Heavy elements in very low concentrations (3.1 and 2501 ppb for Cu and Sr, respectively and less than the detection limit for Pb, Zn, Fe, As, Sb, Hg and Se) were detected in the mine drainage due to Natural Alkaline Mine Drainage (NAMD) with pH=7.6. Mining, however, caused an elevation in the concentration of S, Sr, Cu, As and Se (430000, 8505, 3.7, 1.5 and 3 ppb, respectively) in the groundwater. S, with a rise of 9.4 times in the downstream groundwater comparing to the upstream groundwater, showed the highest increase.Keywords: Coal, Mining, Contamination, NAMD, Groundwater, Tazare
- نتایج بر اساس تاریخ انتشار مرتب شدهاند.
- کلیدواژه مورد نظر شما تنها در فیلد کلیدواژگان مقالات جستجو شدهاست. به منظور حذف نتایج غیر مرتبط، جستجو تنها در مقالات مجلاتی انجام شده که با مجله ماخذ هم موضوع هستند.
- در صورتی که میخواهید جستجو را در همه موضوعات و با شرایط دیگر تکرار کنید به صفحه جستجوی پیشرفته مجلات مراجعه کنید.