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Letteratura scientifica selezionata sul tema "QUARRING OPERATIONS"

Autore: Grafiati

Pubblicato: 26 ottobre 2023

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Articoli di riviste sul tema "QUARRING OPERATIONS"

1

Ozcelik, Mehmet. "Environmental effects of marble quarry operations in Burdur Lake Basin (Burdur-Turkey)". Journal of Degraded and Mining Lands Management 10, n. 3 (1 aprile 2023): 4517. http://dx.doi.org/10.15243/jdmlm.2023.103.4517.

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Marble is the most important natural material because of its structural features and its long durability. It is mined at operated quarries on hill slopes. The original landform is permanently altered, and vegetation cover is destroyed. Another important feature of marble quarries is the large amount of waste materials released during the quarrying process. In the last decades, together with the visible effects of global warming and climate change, fresh water resources are rapidly depleted and polluted due to careless land use. Quarrying operations are among the most important stakeholders of this process. Environmental effects of quarry activities depend on the location of the site in the landscape, the vertical and horizontal dimensions of the excavation, the methods used to excavate the marble, and the formation of the geological structure. Furthermore, the region's seismicity, microclimate conditions, ecological condition, and surface and groundwater conditions are all factors influencing environmental degradation. Additionally, numerous serious environmental impacts associated with quarrying activities near the site, such as visual pollution, water, dust, noise, air pollution, vibration, land subsidence, and landslides, will cause health issues and unpredictable biodiversity loss. Quarrying operations have the potential to impact pre-existing ecosystems, including groundwater depletion, loss of fertile topsoil, forest degradation, and human health. This article aims to draw attention to various serious environmental impacts, health problems and biodiversity loss resulting from quarrying operations in Burdur Lake Basin.

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2

Rasti, Arezou, Hamid Ranjkesh Adarmanabadi e Mohammad Reza Sahlabadi. "EFFECTS OF CONTROLLABLE AND UNCONTROLLABLE PARAMETERS ON DIAMOND WIRE CUTTING PERFORMANCE USING STATISTICAL ANALYSIS: A CASE STUDY". Rudarsko-geološko-naftni zbornik 36, n. 4 (2021): 21–32. http://dx.doi.org/10.17794/rgn.2021.4.3.

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Nowadays, most mining and quarrying industries utilize a diamond wire saw machine for bench cutting operations. This method uses a metal wire or cable assembled by diamond beads to cut the hard stone into large blocks. Many parameters classified into controllable and uncontrollable parameters affect the performance of the diamond wire saw cutting method. The uncontrollable parameters are related to rock engineering properties, and controllable parameters are related to operational aspects and machine performance. The diamond wire sawing process’s production rate is one of the most critical parameters influencing the design optimization and quarrying cost estimation. The cutting rate and wear rate of diamond beads are the most important factors to evaluate quarries’ production performance. This study aims to determine the effects of different controllable and uncontrollable parameters on different quarries’ production rates. Rock engineering properties like strength, hardness, and abrasivity, and operational aspects, such as cutting angle and drive wheel diameters, are considered as the main factors affecting the production performance of the diamond wire saw method. To discover the influence of these parameters, a detailed investigation in ten quarry operations was carried out. The relation between cutting rate and diamond bead wear with different parameters is estimated. It was observed that different controllable and uncontrollable parameters could increase or decrease the cutting rate and diamond bead wearing. Furthermore, using simple and multiple regression analysis, performance prediction of the cutting rate and wearing of diamond beads was developed, and the best equations were proposed.

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3

Al-Anweh, Ahmed M., Mohammed Ibrahim El-Anbaawy, Mohamed Mahmmoud Abu-Zeid e Ibrahim Al-Akhaly. "Geological Complications and Environmental Hazards of the Cement Raw Materials Quarry Sites in Yemen". Sultan Qaboos University Journal for Science [SQUJS] 28, n. 1 (1 giugno 2023): 53–76. http://dx.doi.org/10.53539/squjs.vol28iss1pp53-76.

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Extensive field and site investigations were conducted to assess and evaluate the situation in the presently exploited quarries of cement raw materials in Yemen. These quarries have several geological complications represented mainly by high elevations, steep slopes, rugged topography, heterogeneity in bed thickness, lithologic composition and quality, presence of igneous sills and dykes, intensive fracturing and jointing and abundance of karstification features. Moreover, the processes of quarrying and related operations have several negative environmental impacts the most important of which are soil failure, overburden and land sliding, toppling and rock falls (which result in considerable mass wasting) and emission of dust and noise. Generally, quarrying operations are more hazardous in quarries of gypsum and basement rocks than in those of carbonates and volcanics. Furthermore, the quarries have problems related to the conservation of natural resources. These are represented primarily by the excavation of the valuable agricultural and reclaimed lands and improper exploitation of the cement raw materials and the fresh and underground waters the reserves of which decreased drastically. To deal with the above-mentioned problems, a number of recommendations are outlined. They comprise mitigation measures which must be strictly implemented. Also, it is of almost importance to conduct prospecting for new occurrences of the presently exploited cement raw materials and their possible substitutes as well as additional groundwater resources.

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4

Μερτζάνης, Α., Α. Σκοτίδα, Γ. Ευθυμίου e Γ. Ζακυνθινός. "TEMPORAL EVOLUTION OF THE ENVIRONMENTAL SITUATION (GEOLOGY - GEOMORPHY) AND THE LAND USES OF ABANDONED QUARRIES OF THE MOUNTAIN PENTELIKON (ATTICA - GREECE)". Bulletin of the Geological Society of Greece 36, n. 1 (1 gennaio 2004): 216. http://dx.doi.org/10.12681/bgsg.16624.

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In the frame of this study, the places as well as the methods and techniques used of marble quarrying in the southwest side of mountain Penteliko, have been located and charted. We record the temporal evolution of the situation of the natural environment, with special reference to the geological - geomorphological structure as well as to the land uses in the area of the abandoned quarries in the mountain Penteliko, in combination with different periods of development of the quarrying works from the ancient times until today. We also mention the impacts on the environment during the operation of the quarries and after the ceasing of the works. These environmental impacts include: a. changes in the morphology of the relief, b. differentiation of the erosion conditions of the land c. interference of the hydrological conditions d. formation of dust, e. noise and vibrations, f. disturbance of the natural ecosystems and g. aesthetic decay of the landscape.

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Moh’d, Seif Hamza, e Ahmad Kanyama. "Challenges of Addressing Environmental Problems due to Quarrying Operation in Uwandani Ward, Pemba". World Journal of Social Science Research 3, n. 3 (28 luglio 2016): 367. http://dx.doi.org/10.22158/wjssr.v3n3p367.

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<p><em>This paper examines the challenges of</em><em> addressing environmental challenges arising from aggregates quarrying at Uwandani Ward in Pemba, Zanzibar. Specifically, the study examines i) the socio-economic importance of quarrying</em><em>,</em><em> ii) the environmental impacts</em><em>,</em><em> iii) the interventions done to address environmental problems</em><em>,</em><em> and iv) the constraints over interventions. Data collection methods included household questionnaire survey, key informants interviews and participant observations. Statistical Package for Social Sciences (SPSS) and content analysis techniques were used in the analysis and processing of quantitative and qualitative data. The findings showed that although the revenue generated from quarrying operation is crucial for the livelihood of the local people, persistent environmental problems have been difficult to address due to lack of education, poverty, rapid increase of quarrying operations, drought and climate change variability, apathy in the community and inferior technology used in the quarrying operations. Furthermore, the challenges of tackling environmental problems are contributed by unsuccessful piecemeal interventions of the government because of the lack of clear recognition and appreciation of the artisanal quarrying operation contribution in the livelihood of local people. This paper recommends that the government recognizes and appreciates informal quarrying operations in order to put effective policies to develop the sector and address its environmental problems. This should be accompanied by the participation of all stakeholders in planning and implementation to address environmental problems through bottom-up approaches.</em><em></em></p>

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Goforth, Tom T., e Jessie L. Bonner. "Characteristics of Rg waves recorded from quarry blasts in central Texas". Bulletin of the Seismological Society of America 85, n. 4 (1 agosto 1995): 1232–35. http://dx.doi.org/10.1785/bssa0850041232.

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Abstract Chemical blasts from quarrying operations in central Texas are routinely recorded by the W. M. Keck Foundation Seismological Observatory near China Spring, Texas. The Keck Observatory consists of a single, broadband, three-component, borehole seismograph system. Five quarries, located at distances ranging from 16 to 101 km from the observatory, each detonate from 1 to 6 tons of ammonium nitrate/fuel oil explosive on the average of twice per week. For every quarry for which the orientation of the working face could be determined, dispersed Rg waves are recorded at the Keck Observatory from those quarries at which the working face is directed away from the observatory, but are not observed or are severely attenuated from those quarries at which the working face is directed toward the observatory. Seismograms containing the dispersed Rg are easily recognized as quarry blasts, but those in which the dispersed Rg is absent look like small earthquakes.

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Orfanos, M., H. Perakis e V. Gikas. "RF-BASED LOCALIZATION (WIFI RTT/LORA) IN UNDERGROUND QUARRYING FOR AGENT SUPERVISION AND MAPPING APPLICATIONS". International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-1/W1-2023 (25 maggio 2023): 353–61. http://dx.doi.org/10.5194/isprs-archives-xlviii-1-w1-2023-353-2023.

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Abstract. Mining and quarrying industry has recently made a shift towards underground exploitation as a viable alternative to traditional open-pit approaches. Thus, emerged the imperative need for localization systems for personnel safety and operations’ monitoring purposes. While there are many approaches taking advantage of the various signals of opportunity (SoO) supported by Internet of Things (IoT) for indoor and underground navigation, the need for a GNSS alternative in such areas is still present in terms of meeting system and user requirements (scale, cost, availability, accuracy, and integrity). The goal of this research is to provide insights regarding different Radio Frequency (RF) technologies operation and evaluate their positioning capabilities (Wi-Fi, BLE and LoRa) in underground industrial facilities such as quarries and mines, following and expanding the tests of previous studies in controlled environment. Furthermore, the multi-sensory approach that this study is pursuing, aims to provide the foundations of a low-cost, scalable and robust positioning system. This system would integrate the characteristics of the aforementioned technologies in order to meet the application-specific user requirements and set the basis for a more efficient mobile mapping system. In this context, technologies’ characterization and comparison is presented, by using data from a real operating underground quarry. The data gathered lead to the conceptualization of the localization scheme, which besides the SoO observables, utilizes their availability status as an additional feature within the quarry as well. The proposed combined approach outperformed the rest, achieving an accuracy bellow 15m for the 85% of the test data, which is sufficient for typical quarrying operations monitoring and management requirements.

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Ballin, Torben Bjarke. "The worked quartz vein at Cnoc Dubh, Uig parish, Isle of Lewis, Western Isles". Scottish Archaeological Internet Reports, n. 11 (2004): 1–23. http://dx.doi.org/10.9750/issn.2056-7421.2004.11.1-23.

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In 2002, an examination was carried out of a small quartz vein at the knoll of Cnoc Dubh, a few hundred metres from the southern shores of Loch Ceann Hulabhig on the Isle of Lewis (NGR: NB 2318 2998). The vein proved to have been worked in prehistoric time, defining it as a quarry, and it was measured, photographed and characterized. In the present paper, the Cnoc Dubh quartz quarry is presented in detail, to allow comparison with other lithic quarries, and it is attempted to define attributes diagnostic of prehistoric exploitation, and to schematically describe the 'mining operations' by which the quartz was procured. As part of this process,quartz quarrying is compared to the procurement of other lithic and stone raw materials, mainly drawing on research from Scandinavia, Australia and the USA, and the location of quartz quarries in relation to prehistoric settlements is discussed. The average distance between quartz sources and Neolithic–Bronze Age sites on Lewis is then used to discuss ownership of, and access to, prehistoric quartz sources, as well as the possible exchange of quartz.

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Sevelka, Tony. "Blasting Quarry Operations: Land Use Compatibility Issues and Potential Property Value Impacts". Journal of Environmental Law & Policy 02, n. 03 (28 dicembre 2022): 1–78. http://dx.doi.org/10.33002/jelp02.03.01.

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Aggregate resources are essential for road and building construction. In 2019, the US domestic production reached 1.53 billion tons of crushed stone valued at $18.7 billion produced by an estimated 1,430 companies operating 3,440 quarries, according to the U.S. Geological Survey (USGS) Mineral Commodity Summaries. But, it is also recognized that a quarry blasting below the water table is one of the most noxious, toxic and destructive uses of land, with no reasonable prospect of post-extraction-rehabilitation. If permitted and established in the wrong geographic location, a blasting quarry operation can result in significant deleterious impacts on the environment and local inhabitants and can disrupt short and long-term land use planning objectives. Because a quarry can remain operational for 100+ years, impacting five or more generations; quarries have the potential to cause permanent environmental degradation, destabilize communities, damage, sterilize or diminish the use and enjoyment of residential and non-residential properties, and reduce property values. Blasting is the preferred method of extracting rock in a quarry operation, the consequences of which can lead to environmental and property damage, and to injury or death of human and non-human life. In North America, licensing and operational oversight of a pit or quarry are primarily controlled by the individual states, territories and provinces, and address matters of compliance, while issues related to land use planning and zoning are entirely within the jurisdiction of the local municipalities, counties or regions. Accordingly, this research paper seeks to inform land use planners of the importance of protecting the environment and its inhabitants from the adverse effects, including the diminution in property values, associated with aggregate extraction operations generally and blasting quarries specifically, through the use of permanent onsite setbacks and offsite separation distances to avoid land use incompatibility and sensitive land uses.

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J, Matsimbe. "Optimization of Shovel-Truck Productivity in Quarries". International Journal of Research in Advent Technology 8, n. 10 (10 novembre 2020): 1–9. http://dx.doi.org/10.32622/ijrat.810202008.

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In open pit operations, the loading equipment drives production but the haulage fleet drives costs. Most quarries in Malawi face challenges in shovel-truck productivity due to factors which require optimization of mine operations. The case of Njuli quarry is used to come up with a model that can be applied by quarries in Malawi. Loading and haulage costs account as much as 50 – 60 % of a company’s total operation cost hence it is necessary to maintain an efficient shovel-truck system. This research optimized the shovel-truck productivity per day, applied the queuing theory to the haul cycle, and suggested ways to improve the efficiency of materials handling operations. Examining a match between truck body size and shovel bucket size yielded the size of the load, cycle time and number of trips in an hour. The cycle time depended on the weight of the equipment, the horsepower of the engine, haul distance, and condition of the road plus dump area. Quarry companies in Malawi will apply this new knowledge to improve equipment selection and maximize the tonnage of aggregates produced per day to meet production targets.

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Tesi sul tema "QUARRING OPERATIONS"

1

Woofter, Christopher L. "Environmental compliance in quarrying operations: a computer-based decison support system". Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/41029.

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Woofter, Christopher L. "Environmental compliance in quarrying operations : a computer-based decision support system /". This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-02132009-171056/.

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Mabika, Bernard. "Improving Workers' Safety and Health in the Zimbabwean Mining and Quarrying Industry". ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/5499.

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Lack of effective occupational safety and health (OSH) strategies is a reason that workplace accidents in the mining and quarrying industry remain high, making the industry one of the riskiest operations worldwide. The purpose of this multiple case study was to explore successful strategies mining and quarrying leaders in Zimbabwe used to improve OSH. The key research question addressed successful strategies leaders in the mining and quarrying industry use to improve employee occupational safety and health in Zimbabwe. Six successful business leaders from 3 mining and quarrying mines in Zimbabwe demonstrated an exception to unsafe practices, particularly through their exceptional OSH improvement records. The conceptual framework of the study was Deming's plan-do-study-act cycle theory. Data were gathered through review of company documents, and in-depth interviews with 6 mining and quarrying leaders in Zimbabwe who had successfully improved OSH strategies in the workplace. Transcribed interview data were classified, coded, and analyzed. Themes that emerged included organizational culture, compliance with rules and regulations, and accident prevention. The results of the study indicate that successful OSH leaders designed the workplace, trained and developed employees, and empowered and equipped employees with the relevant skills and knowledge. The findings support positive social change by providing mining and quarrying leaders with knowledge and skills to improve OSH strategies in the workplace, thereby promoting a safe workplace and zero accident tolerance in the workforce and the community.

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FAISAL, JAMAL. "ASSESSING THE ENVIRONMENTAL AND SOCIAL IMPACTS OF QUARRY MINING PROJECTS IN MOGADISHU, SOMALIA". Thesis, 2023. http://dspace.dtu.ac.in:8080/jspui/handle/repository/20143.

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This research focuses on the assessment of the impact of quarry mining activities on the environment and the nearby community in the Karan and Wadajir district of Mogadishu, Somalia. The study focuses on the effects of quarrying activities on society and the environment, as well as potential solutions to these problems. The research objectives include identifying the main factors contributing to improper quarrying activities, investigating the effects of such activities on the environment and its surrounding neighborhood. The significance of this research lies in advancing knowledge about the effects of quarry extraction on natural and social settings. By studying the perceptions of nearby neighbors and corporate employees, the research aims to provide insights into how individuals in mining districts perceive the social and ecological consequences associated with quarry mining operations. The findings of this study can be used by planners, policymakers, and decision-makers to manage abandoned quarries effectively and turn them into secure locations. The research also aims to provide guidance on ecologically sustainable and friendly quarrying operations to fill the existing scientific and knowledge gap. The study is geographically limited to the Mogadishu quarries in the El-addo, Karan, and Wadajir districts. The research methodology involves a questionnaire surveys, interviews, and observations. The data collected from quarry workers, local residents, and environmental protection authorities are analyzed using descriptive statistics. The majority of respondents fell within the 26-35 age range, and quarry owners/operators constituted the largest occupation group. The level of awareness among quarry workers and operators about proper mining practices was rated as high by 34.5% of the respondents. While 34.5% of respondents were aware of negative environmental impacts caused by quarry mining activities, 65.5% reported being unaware. Factors contributing to improper quarrying activities include limited knowledge about sustainable mining practices, lack of regulations and enforcement, poverty and economic desperation, corruption and illegal activities, and insufficient government oversight. The research findings contribute to raising awareness about the potential environmental effects of quarries and provide valuable information for mitigation and corrective actions. The results also inform decision-making processes and facilitate the proper management and rehabilitation of abandoned quarry sites. By filling the knowledge gap, the research supports the development of ecologically sustainable quarrying operations.

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Libri sul tema "QUARRING OPERATIONS"

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Moebs, Noel N. Geotechnology in slate quarry operations. [Pittsburgh, Pa.]: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Moebs, Noel N. Geotechnology in slate quarry operations. Washington, DC: U.S. Bureau of Mines, 1986.

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Western Australia. Dept. of Minerals and Energy., a cura di. Environmental management of quarries: Development, operation, and rehabilitation guidelines. [Perth?]: Dept. of Minerals and Energy, Western Australia, 1994.

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Nalley, G. M. Simulation of the effects of nearby quarrying operations on ground-water flow at the South Well Field, Franklin County, Ohio. [Columbus, Ohio]: U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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Bell, S. B. Guidelines for the approval of pit and quarrying operations under The Environmental Protection Act. Toronto: Ministry of the Environment, Approvals Branch, 1990.

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Ishkov, Aleksandr, Mihail Vikulov e Yuriy Bochkarev. Operation of mining and transport vehicles in the quarries of the North. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1077325.

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The textbook discusses the features of the operation of mining and transport machines in open-pit mining in a cold climate zone, highlights previously unexplored problems of operation of this type of equipment, and describes methods for determining the operational reliability of equipment. The proposed methods of operation are based on the analysis of a significant amount of statistical material on failures of equipment operating at large mining enterprises of the Republic of Sakha (Yakutia). The influence of low temperatures on the reliability indicators and technical and economic results of the operation of mining and transport machines was determined quantitatively and qualitatively. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is intended for students of higher educational institutions studying in the specialty 21.05.04 "Mining", it can also be useful for graduate students, researchers and practitioners specializing in the technical operation of mining and transport machines.

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Nalley, G. M. Simulation of the effects of nearby quarrying operations on ground-water flow at the South Well Field, Franklin County, Ohio. [Columbus, Ohio]: U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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Tonks, Eric S. The Ironstone quarries of the Midlands: History, operation and railways. Cheltenham: Runpast Publishing, 1988.

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Environment, Alberta Alberta. Conservation and reclamation guidelines for borrow operations. [Edmonton, Alta.]: Alberta Environment, 1992.

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Montana. Department of State Lands. [Environmental assessment on a proposal by Conda Mining Inc. to expand their Pipestone Quarry operation near Whitehall, Montana]. Helena, Mont: Dept. of State Lands, 1994.

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Capitoli di libri sul tema "QUARRING OPERATIONS"

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"quarrying (operation(s))". In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1064. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_170079.

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Hirt, Alfred Michael. "Imperial Officials and Extractive Operations". In Imperial Mines and Quarries in the Roman World, 107–67. Oxford University Press, 2010. http://dx.doi.org/10.1093/acprof:oso/9780199572878.003.0004.

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Hirt, Alfred Michael. "The Emperor and Imperial Extractive Operations". In Imperial Mines and Quarries in the Roman World, 332–56. Oxford University Press, 2010. http://dx.doi.org/10.1093/acprof:oso/9780199572878.003.0008.

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Tiberio Moilinga, Pasquale, e Makuac Robert Athian. "Impacts of Stone Quarrying on Local Vegetation in Mount Korok Area, Juba, Central Equatoria State, South Sudan". In New Insights Into Protected Area Management and Conservation Biology [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109707.

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This study was carried out in three quarry sites at Mount Korok, also known as Jebel Kujur area, which is located within Juba Town Council in Central Equatoria State, South Sudan. The main aim was to assess the impact of quarrying activities on the local ground cover vegetation, mainly grasses and low-lying non-woody herbaceous plants. The methods used included, besides direct observations, iron frame quadrats of 1 × 1 m2 in size, for random sampling of attributes and community characteristics of the plants in three different sites. The first site was an old, abandoned stone-quarrying site; the second was where quarrying work was actively going on at the time of the study; and the third was an area never before exposed to stone quarrying (hence, acting as a control). Data were analyzed using descriptive statistics such as frequency distribution, density measures, diversity indices, and correlations. The research was carried out during the wet season when most plants were green and at different stages of flowering and/or fruiting from July through September, 2020. The results revealed that over 44 species of ground cover plants were identified, some of which were more abundant and had the widest distribution and frequency in the three study sites, including Cynodon lemfuensis, Cyperus rotundus, Bracharia ramose, Merremia pinata, Cyanodon dactylon, and Digitaria fernatad, whereas others were limited to one site or the other. Results also indicated that though stone-quarrying activities have impacts on ground cover plants, however, they are not the only factor affecting ground cover plants. More than 80% of the impacts on ground cover plants are caused by factors other than stone quarrying but were not identified during this study. It was therefore recommended that future studies in the area on the same theme should isolate the effects of stone quarrying on ground cover plants from these other operating factors through discriminant functional analysis.

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Hirt, Alfred Michael. "The Roman Army and Imperial Extractive Operations". In Imperial Mines and Quarries in the Roman World, 168–201. Oxford University Press, 2010. http://dx.doi.org/10.1093/acprof:oso/9780199572878.003.0005.

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Hirt, Alfred Michael. "Private Partners to Imperial Operations: Occupatores/Coloni and Conductores". In Imperial Mines and Quarries in the Roman World, 261–331. Oxford University Press, 2010. http://dx.doi.org/10.1093/acprof:oso/9780199572878.003.0007.

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Moodley, Leven, Claude Cunningham e Hennie Lourens. "Measuring the effect of blasting fragmentation on hard rock quarrying operations". In Rock Fragmentation by Blasting, 353–59. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078104-50.

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Goodwin, Joshua A. "Aggregate mining on Mount Zion, Clayton, California". In Regional Geology of Mount Diablo, California: Its Tectonic Evolution on the North America Plate Boundary. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.1217(05).

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ABSTRACT Two construction aggregate companies, Cemex and Hanson Aggregates, operate respective crushed stone quarries on the east and west slopes of Mount Zion in Clayton, California. These sidehill quarries utilize a single highwall and mine Jurassic diabase of the Coast Range ophiolite that formed as a sheeted dike complex. Hydrothermal veins, some containing 20%–30% disseminated pyrite and chalcopyrite, cut the diabase. The east quarry, operated by Cemex, was started by the Harrison-Birdwell Company in 1947. The west quarry, operated by Hanson, was started by the Henry J. Kaiser Sand and Gravel Company in 1954. The Cemex quarry highwall is visible as you come into the city of Clayton on Marsh Creek Road, with a height of ~280 m (920 ft). The height of the highwall at the Hanson quarry is ~215 m (700 ft). Both operations remove weathered diabase overburden to expose fresh diabase, which is drilled, blasted, and hauled to the plant for processing. To ensure aggregate is suitable for construction, quality assurance testing is conducted in accordance with the specifications of various agencies. These quarries supply the surrounding area with aggregate for hospitals, schools, highways, dams, and other buildings. Noteworthy projects supplied by the Clayton quarries include the Concord BART Station, Interstate-680, Interstate-580, Calaveras Dam, Sherman Island Levee, Highway 4, Highway 24, and Bay Bridge epoxy asphalt. Before aggregate was mined, Mount Zion was the site of a copper rush from 1862 to 1864. Gold and silver were also reported in various assays from the Clayton district. Although prospecting created excitement around Clayton, no productive orebodies were ever discovered.

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Kotadiya, Sanjay M., Joydeep Majumder e Sunil Kumar. "Application of Biomechanics Instrumentation in Occupational Health Research". In Research Anthology on Changing Dynamics of Diversity and Safety in the Workforce, 567–84. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-2405-6.ch029.

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Occupational morbidities during manual material handling operations are routine at workplaces. This is a global burden contributing substantially to the economy. The multifactorial etiology for musculoskeletal disorders (MSDs) along with workplace stressors require multidisciplinary preventive effort. Biomechanics plays a pivotal role in occupational health research quarrying into the root cause analysis of posture, load handling, muscular loading, balance, and stability at work. Sophisticated instrumentation and experimental techniques assist in understanding the biomechanical mechanisms of MSDs and ergonomic principles, etc. Kinetic, kinematic, isotonic, isokinetic, as well as isometric experimental modes investigate body postures and muscular responses. Foundation of biomechanics instrumentation and injury mechanism would aid researchers alongside ergonomists in dealing with identification, assessment, and control of workplace risks through participatory ergonomics approach. Judicious utilization of this discipline would approach a long-term sustainable solution to protect health and safety of workers at the workplace.

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Kotadiya, Sanjay M., Joydeep Majumder e Sunil Kumar. "Application of Biomechanics Instrumentation in Occupational Health Research". In Advances in Medical Technologies and Clinical Practice, 85–102. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4969-7.ch004.

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Abstract (sommario):

Occupational morbidities during manual material handling operations are routine at workplaces. This is a global burden contributing substantially to the economy. The multifactorial etiology for musculoskeletal disorders (MSDs) along with workplace stressors require multidisciplinary preventive effort. Biomechanics plays a pivotal role in occupational health research quarrying into the root cause analysis of posture, load handling, muscular loading, balance, and stability at work. Sophisticated instrumentation and experimental techniques assist in understanding the biomechanical mechanisms of MSDs and ergonomic principles, etc. Kinetic, kinematic, isotonic, isokinetic, as well as isometric experimental modes investigate body postures and muscular responses. Foundation of biomechanics instrumentation and injury mechanism would aid researchers alongside ergonomists in dealing with identification, assessment, and control of workplace risks through participatory ergonomics approach. Judicious utilization of this discipline would approach a long-term sustainable solution to protect health and safety of workers at the workplace.

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Atti di convegni sul tema "QUARRING OPERATIONS"

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Tsang, W. H., Y. K. Ho e Clayton Y. K. Chan. "An Unprecedented Land Supply Means in Hong Kong: Under-ground Quarrying-cum-Cavern Development". In The HKIE Geotechnical Division 42nd Annual Seminar. AIJR Publisher, 2022. http://dx.doi.org/10.21467/proceedings.133.36.

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Cavern development is a viable source of land supply, which can provide solution space for a broad variety of land uses and preserve the valuable ecology and green environment at the ground surface. While most of the caverns are purposely built to house various facilities, underground quarrying-cum-cavern development at suitable sites is a viable means of creating a valuable cavern land bank. With thoughtful planning and prudent site selection, the operation of an underground quarry associated with concrete batching and asphalt production operations can be a self-financing or even profitable business in the short to medium term, while the cavern space created can be utilized for other strategic uses in the long term. To take forward this initiative, the Civil Engineering and Development Department has completed a technical study to establish the technical feasibility and possible implementation arrangement of underground quarrying-cum-cavern development in Hong Kong. A prototype reference design based on the site setting of the Lam Tei Quarry has been produced, considering factors including technical, operational and logistic considerations. This paper presents the findings of the study, including the reference design and implementation model, and discusses the prospect of the underground quarry-cum-cavern development as a land supply means in Hong Kong.

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Sobolevskyi, Ruslan. "USING CLUSTER ANALYSIS FOR PLANNING MINING OPERATIONS ON THE GRANITE QUARRIES". In 16th International Multidisciplinary Scientific GeoConference SGEM2016. Stef92 Technology, 2016. http://dx.doi.org/10.5593/sgem2016/b22/s09.034.

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Venkatesh, H. S., e G. Gopinath. "Approach for operation and expansion of quarries prone for blast vibration issues". In Recent Advances in Rock Engineering (RARE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/rare-16.2016.83.

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Witt, Kristian. "Sources of Greenhouse Gases at Mineral Quarries and Review of Innovative Operational Methods". In World Water and Environmental Resources Congress 2005. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40792(173)330.

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Emad, M. Z., Y. Majeed, M. Waqas e G. Rehman. "Rock Salt Block Extraction Using Conventional Rock Mining Methods". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0579.

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ABSTRACT Rock salt is produced in large quantities in Pakistan's Salt Range region. Salt tiles, blocks, and lamps are the primary rock salt exports, whilst household usage and the chemical sector are the main local consumers. The size, shape and quality of the block play a role in how profitably salt may be produced for value addition. When the blocks have very few cracks, adding value to the salt is simpler. The current method of extracting salt includes drilling and blasting that causes unintended cracks in the blocks. The extraction of rock salt blocks using traditional cuboid-shaped block mining techniques is the main topic of this research. The methods include blasting with low-yield explosives, expansion agents, and wedges and feathers. The in-situ experiments resulted in wedges and feathers approach being the most effective way to mine rock salt blocks of the correct size and form, while reducing cracking. Using core drilling at the block's edge, the quality of the blocks for the various procedures was evaluated. INTRODUCTION Rock salt is mined using traditional drill and blast methods in both underground mining and quarrying operations. In general, automated mining processes make it possible to recover minerals using mechanical excavators, brine pumping, and evaporation techniques. Nonetheless, the room-and-pillar method of conventional underground mining of large deposits is the most time-tested and widely used method for extracting salt. The salt recovery is about 40%, rest is left in the mine to support the roof (Hustrulid, 2001). With an annual production of roughly 2.16 Mt, Pakistan is a country that produces rock salt (Department of Mines & Minerals, 2015). Just 15% of salt produced is thought to be export quality, with the remaining salt being of low value because of cracks created during mining. Globally, Himalayan rock salt is a very well-liked product. There is high demand for a variety of products, including salt blocks, salt lamps, tiles, salt block slabs, and materials for medical slabs (Naz and Haleem, 2010; Rashleigh et al., 2014).

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Rapporti di organizzazioni sul tema "QUARRING OPERATIONS"

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Simulation of the effects of nearby quarrying operations on ground-water flow at the South Well Field, Franklin County, Ohio. US Geological Survey, 1999. http://dx.doi.org/10.3133/wri994136.

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Effects of limestone quarrying and cement-plant operations on runoff and sediment yields in the Upper Permanente Creek basin, Santa Clara County, California. US Geological Survey, 1989. http://dx.doi.org/10.3133/wri894130.

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