scholarly journals Performance evaluation of continuous miner based underground mine operation system: An OEE based approach

2019 ◽  
Vol 2 (1) ◽  
pp. 596-603
Author(s):  
Sumit Banerjee
Keyword(s):  
Preventive Maintenance ◽  
Large Scale ◽  
Mining Machine ◽  
Continuous Miner ◽  
Electrical Systems ◽  
Equipment Availability ◽  
Mining Condition ◽  
More Care ◽  
Mining Projects ◽  
Maintenance Programme

Abstract CM is a globally renowned machine, designed to work as a mass production technology for underground coal. Different major coal producers across the globe are using this technology for decades to produce underground coal efficiently. India is also one of the major players globally in the arena of coal production and adopted this cutting edge technology since last decade by implementing at. few of the selective underground coal mining projects. Performance of CM technology is influenced by the geo-mining condition, fleets of other ancillary units and reliability of subsystems while implementation of this system depends largely on the extent of reserve. These aspects generate a scope of large scale research and development in this field. Overall Equipment Effectiveness (OEE) is the parameter to benchmark the equipment performance globally. OEE is the product of equipment availability, performance and product quality. This mining machine based paper focuses on the Overall Equipment Effectiveness (OEE) of the complete CM based operation to identify the vulnerable systems, which helps to design proper preventive maintenance programme. The CM based system is divided into few subsystems, such as; electrical, cutter, gathering arrangement, traction, hydraulic, chassis, feeder breaker, shuttle car, CM conveyor and out-bye conveyor. The downtime data used for this analysis is collected from an underground coal mine situated in the central part of India, belongs to one leading coal producing company of the country. From analysis it was found that, electrical systems and conveyors are among most vulnerable systems and deserves more care during maintenance. On the basis of these results recommendations are made to redesign the Preventive Maintenance Programme, in order to avoid the lower availability as well as lower OEE.

Effect of Operator Position on the Incidence of Continuous Mining Machine/Worker Collisions

2007 ◽  
Vol 51 (20) ◽  
pp. 1416-1420
Author(s):  
John R. Bartels ◽  
Dean H. Ambrose ◽  
Sean Gallagher
Keyword(s):  
Response Times ◽  
Health And Safety ◽  
Mining Machine ◽  
Workplace Relationships ◽  
Continuous Miner ◽  
Work Posture ◽  
Close Proximity ◽  
Continuous Mining ◽  
Machine Speed ◽  
Machine Work

Remote operation of continuous miners has enhanced the health and safety of underground miners in many respects; however, numerous fatal and non-fatal continuous miner struck-by accidents have occurred when using remote controls. In an effort to prevent these injuries, NIOSH researchers at Pittsburgh Research Laboratory examined the workplace relationships between continuous miner operators and various tramming modes of the equipment using motion captured data, predicted operator response times, and field- of- view data to determine causes of operator-machine struck-by events in a virtual mine environment. Factors studied included machine speed, direction of escape, operator facing orientation relative to the machine, work posture, distance from machine, and operator anthropometry. Close proximity to the machine, high machine tramming speeds, a right-facing orientation and operator positioning near the tail all resulted in high risk of being struck. It is hoped that this data will provide an improved rationale for operator positioning for remotely operated continuous miners.

scholarly journals Large-scale water balance indicators for different pruning dates of tropical wine grape

2016 ◽  
Vol 51 (7) ◽  
pp. 849-857 ◽  
Author(s):  
Antônio Heriberto de Castro Teixeira ◽  
Jorge Tonietto ◽  
Janice Freitas Leivas
Keyword(s):  
Water Balance ◽  
Large Scale ◽  
Scale Up ◽  
Crop Coefficient ◽  
Thermal Conditions ◽  
Wine Grape ◽  
Wine Quality ◽  
Growing Seasons ◽  
More Care ◽  
Brazilian Northeast

Abstract: The objective of this work was to develop and apply water balance indicators to be scaled up in the wine grape (Vitis vinifera) growing regions of the municipalities of Petrolina and Juazeiro, in the states of Pernambuco and Bahia, respectively, Brazil, simulating different pruning dates along the year. Previous energy balance measurements were used to relate the crop coefficient (Kc) with the accumulated degree-days (DDac). This model was applied to scale up the water balance indicators during the growing seasons. When irrigation water was available, the best pruning periods were from May to July, due to the better natural thermal and hidrological conditions. More care should be taken for pruning done in other periods of the year, regarding the effect of increasing thermal conditions of wine quality. The water balance indicators, both successfully developed and applied, allow large-scale analyses of the thermohydrological conditions for wine grape production under the semiarid conditions of the Brazilian Northeast.

scholarly journals Resistance to Canadian mining projects in Mexico: lessons from the lifecycle of the San Xavier Mine in San Luis Potosí

2019 ◽  
Vol 26 (1) ◽  
pp. 84 ◽  
Author(s):  
Darcy Victor Tetreault
Keyword(s):  
Large Scale ◽  
Local Level ◽  
Living Environment ◽  
Human Consumption ◽  
Ecological Distribution ◽  
Political Class ◽  
San Luis ◽  
San Luis Potosi ◽  
Mining Projects ◽  
San Luis Potosí

<p>This article analyses resistance movements to large-scale mining projects in Mexico, particularly the case of sustained organized resistance to the San Xavier Mine, in the central north state of San Luis Potosí. As one of the first struggles in Mexico against Canadian mining projects after the signing of the North American Free Trade Agreement, the leaders of this movement pioneered strategies of resistance on the legal front and were instrumental in building anti-mining alliances and networks on the national and international levels. Now that the excavation process has finished and the mine is closing down, this article seeks to draw on the case to illustrate the complementarity of three approaches for interpreting resistance to mining: class struggle, ecological distribution conflicts, and the clash of cultural valuations over territorial vocation. The argument is that these approaches are not mutually exclusive; they can be combined to explain the multiple dimensions of specific struggles, whose shifts in emphasis at different moments of the struggle are conditioned by – and condition – the phase of a mine's development. By contextualizing the case study in a broader analysis of social environmental conflicts around mining in Mexico and elsewhere in Latin America, the analysis seeks to illustrate the ways in which the struggle against the San Xavier Mine is representative of broader trends, as well as its peculiarities. On the local level, we find the struggle has more to do with defending conditions of social and cultural reproduction than protecting the means of production that sustain traditional livelihoods. This pertains, not just to a non-contaminated living environment and the availability of clean water for human consumption, but also to the conservation of natural and architectural patrimony with historic and cultural significance.</p><p><strong>Key words</strong>: Mining conflicts, Canadian imperialism, political class formation, ecological distribution, cultural valuations</p>

No Ethnographic Playground: Mining Projects and Anthropological Politics.A Review Essay

2016 ◽  
Vol 58 (2) ◽  
pp. 577-586 ◽  
Author(s):  
Marina Welker
Keyword(s):  
United States ◽  
South Africa ◽  
Papua New Guinea ◽  
Review Essay ◽  
Large Scale ◽  
The United States ◽  
Mining Companies ◽  
Ethnographic Studies ◽  
Mining Projects ◽  
Capital Intensive

“Mining is no ethnographic playground,” Chris Ballard and Glenn Banks warned in their 2003 review of the anthropology of mining. The deep conflicts that characterize the industry find echoes in “a parallel war of sorts …waged within the discipline about the nature and scope of appropriate forms of engagement” (p. 289). This review essay examines how authors of recent ethnographic studies of large-scale, capital-intensive mining projects in Papua New Guinea, South Africa, and the United States have politically positioned themselves as researchers, and the insights into mining companies that derive from these situated perspectives.

scholarly journals Estimating the mortality burden of large scale mining projects—Evidence from a prospective mortality surveillance study in Tanzania

2021 ◽  
Vol 1 (10) ◽  
pp. e0000008
Author(s):  
Isaac Lyatuu ◽  
Mirko S. Winkler ◽  
Georg Loss ◽  
Andrea Farnham ◽  
Dominik Dietler ◽  
...  
Keyword(s):  
Mortality Risk ◽  
Large Scale ◽  
Road Traffic ◽  
Population Level ◽  
Risk Difference ◽  
Mining Communities ◽  
Gold Mines ◽  
Mortality Burden ◽  
Mining Projects ◽  
Mortality Surveillance

We set up a mortality surveillance system around two of the largest gold mines in Tanzania between February 2019 and February 2020 to estimate the mortality impact of gold mines. Death circumstances were collected using a standardized verbal autopsy tool, and causes of death were assigned using the InSilicoVA algorithm. We compared cause-specific mortality fractions in mining communities with other subnational data as well as national estimates. Within mining communities, we estimated mortality risks of mining workers relative to other not working at mines. At the population level, mining communities had higher road-traffic injuries (RTI) (risk difference (RD): 3.1%, Confidence Interval (CI): 0.4%, 5.9%) and non-HIV infectious disease mortality (RD: 5.6%, CI: 0.8%, 10.3%), but lower burden of HIV mortality (RD: -5.9%, CI: -10.2%, -1.6%). Relative to non-miners living in the same communities, mining workers had over twice the mortality risk (relative risk (RR): 2.09, CI: 1.57, 2.79), with particularly large increases for death due to RTIs (RR: 14.26, CI: 4.95, 41.10) and other injuries (RR:10.10, CI: 3.40, 30.02). Our results shows that gold mines continue to be associated with a large mortality burden despite major efforts to ensure the safety in mining communities. Given that most of the additional mortality risk appears to be related to injuries programs targeting these specific risks seem most desirable.

scholarly journals Sensitivity analysis as a decision-making tool for the implementation of an investment project in mining industry

2021 ◽  
Vol 21 (3) ◽  
pp. 295-303
Author(s):  
Elena A. Pozdnyakova ◽  
◽  
Liudmila A. Ramenskaya ◽  
Dmitrii S. Voronov ◽  
◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Large Scale ◽  
Quantitative Methods ◽  
Mining Industry ◽  
Commodity Prices ◽  
Investment Project ◽  
Technical Equipment ◽  
Investment Projects ◽  
Sensitivity Analysis Method ◽  
Mining Projects

Introduction. Russian mining companies need to implement large-scale investment projects due to a variety of internal and external reasons. Projects are aimed at the development of new deposits, technical equipment and the modernization of existing ones. To make substantiated management decisions, a toolkit for analyzing the risks of investment projects is required. Theoretical analysis. The section contains the need to apply quantitative methods for assessing investment risks based on cash flow modeling. We have analyzed the possibility of the use of sensitivity analysis techniques, real options and Monte Carlo methods for the quantitative assessment of the mining industry investment projects risks. The result includes a justification of the feasibility of applying the sensitivity analysis method at the early stages of an investment project. Empirical analysis. The sensitivity analysis tested metrics such as production volumes, commodity prices, capital and operating costs on two mining projects. It was found out that the projects under consideration are the most sensitive to changes in the price of commercial products. Results. Sensitivity analysis is a useful tool for risk analysis of investment projects. The application of this method to an investment project in the mining industry should be carried out taking into account the industry specifics.

scholarly journals Characterization of Excavated Waste of Different Ages in View of Multiple Resource Recovery in Landfill Mining

2020 ◽  
Vol 12 (5) ◽  
pp. 1780 ◽  
Author(s):  
Isabella Pecorini ◽  
Renato Iannelli
Keyword(s):  
Large Scale ◽  
Treatment Plant ◽  
Calorific Value ◽  
Landfill Mining ◽  
Specific Objective ◽  
Methane Potential ◽  
Mining Projects ◽  
Multiple Resource ◽  
First Time

With the aim of examining the forcing factors in postmanagement landfills, in this study, excavation waste from nonhazardous municipal waste landfill in Tuscany was characterized for the first time. The specific objective was to estimate the feasibility of sampling and analyzing the excavated waste in order to define its properties and provide information about possible landfill mining projects. Based on the biochemical methane potential assays, it was shown that the excavated waste had not yet been stabilized (i.e., with a production of 52.2 ± 28.7 NlCH4/kgTS) in the landfill, probably due to the low excavated waste moisture content (36% ± 6% w/w). Furthermore, excavated waste has a high calorific value, i.e., 15.2 ± 4.1 MJ/kg; the quantity of combustibles in the industrial shredder waste (16 MJ/kg) was rather modest compared to that of municipal solid waste (20.8 MJ/Kg). In conclusion, during large scale excavation of the landfill, it was possible to evaluate how a dedicated treatment plant could be designed to treat and select waste which might appear in a different category. For excavated industrial waste, detailed mechanical sorting may be convenient for end-of-waste recovery to improve calorific value.

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