LaunchCenter for Amphibious Construction on a New Lake in a Transforming Region of Opencast Mines

2021 ◽  
pp. 505-516
Author(s):  
Benjamin Casper
Keyword(s):  
Opencast Mines

scholarly journals The Influence of Opencast Lignite Mining Dehydration on Plant Production—A Methodological Study

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1917
Author(s):  
Benedykt Pepliński ◽  
Wawrzyniec Czubak
Keyword(s):  
Brown Coal ◽  
Crop Production ◽  
Plant Production ◽  
External Costs ◽  
Opencast Mines ◽  
Temporal And Spatial ◽  
Potato Yields ◽  
Burning Coal ◽  
Depression Cone ◽  
The Cost

In many circles, brown coal continues to be viewed as a cheap source of energy, resulting in numerous investments in new opencast brown coal mines. Such a perception of brown coal energy is only possible if the external costs associated with mining and burning coal are not considered. In past studies, external cost analysis has focused on the external costs of coal burning and associated emissions. This paper focuses on the extraction phase and assesses the external costs to agriculture associated with the resulting depression cone. This paper discusses the difficulties researchers face in estimating agricultural losses resulting from the development of a depression cone due to opencast mineral extraction. In the case of brown coal, the impacts are of a geological, natural-climatic, agricultural-productive, temporal, and spatial nature and result from a multiplicity of interacting factors. Then, a methodology for counting external costs in crop production was proposed. The next section estimates the external costs of crop production arising from the operation of opencast mines in the Konin-Turek brown coal field, which is located in central Poland. The analyses conducted showed a large decrease in grain and potato yields and no effect of the depression cone on sugar beet levels. Including the estimated external costs in the cost of producing electricity from mined brown coal would significantly worsen the profitability of that production.

scholarly journals A study of vibration exposure and work practices of Loader and Dozer operators in opencast mines

2012 ◽  
Vol 2 (2) ◽  
pp. 3-7 ◽  
Author(s):  
Bibhuti Bhusan Mandal ◽  
Krishnendu Sarkar ◽  
Veena Manwar
Keyword(s):  
Health Risk ◽  
Occupational Safety ◽  
Vertical Direction ◽  
Control Measures ◽  
Whole Body ◽  
Reverse Direction ◽  
Work Practices ◽  
Continuous Change ◽  
Background Exposure ◽  
Opencast Mines

Background: Exposure to whole body vibration (WBV) at work and development of musculoskeletal disorders are well linked. Vehicle vibrations are usually perceived to occur in vertical direction and are likely to cause lumbar disorders in operators. Vibration characteristics of the machines need to be studied and compared with work practices which may indicate nature of health risk to operators. This may help in developing specific action plans to control vibration related health risk. Objective: The objectives of the study were, to measure and analyze vibration magnitudes, observe work practices of Loaders and Dozers, evaluate health risk to their operators and to formulate recommendations for control measures. Methods and Material: Frequency weighted Root Mean Square values of acceleration data was collected as per guidelines in ISO 2631-1:1997 using human vibration analyzers. WBV exposure of 40 (Forty) Loader and Dozer operators in eight opencast mines were evaluated to assess health risk using vibration magnitude and corresponding daily exposure durations. Results and Conclusion: The dominant axis of vibration in dozers was found to be X (front to back) in 80% of the equipments. This is different from transporting equipment like Dumpers which have Z axis as dominant axis of vibration. A continuous change of movement in forward and reverse direction and rash driving were found to be contributory factors for increased vibration intensity along X- axis. It was observed that 27(68%) of them showed moderate whereas 12(30%) equipment showed high health risk. It is suggested that vibration control measures should be designed and adopted based not only on the intensity but also on the dominant axis typical to the equipment and work practices.DOI: http://dx.doi.org/10.3126/ijosh.v2i2.6144 International Journal of Occupational Safety and Health, Vol 2. No 2 (2012) 3-7 

Metalliferous potential of the United Kingdom

1974 ◽  
Vol 339 (1618) ◽  
pp. 289-297 ◽  
Keyword(s):  
United Kingdom ◽  
Mechanical Equipment ◽  
Potential Production ◽  
Ore Deposit ◽  
The United Kingdom ◽  
Future Production ◽  
Ore Bodies ◽  
Vein Type ◽  
Opencast Mines ◽  
Vein Deposits

The total estimated value of past non-ferrous metalliferous production, as well as that of fluorspar, barytes and witherite, in the United Kingdom, as a whole, is £5.95 x 10 9 at assumed average 1973 metal and mineral prices. Southwest England produced roughly 70% of this value. The outlook for future production appears to be best in Wales and Scotland. At least one large unmined ore deposit of disseminated type is known, although vein-type ore bodies are more likely to be found. The effects of the development of high-tonnage mechanical equipment favour opencast mines and imply that vein deposits must be rich in order to compete economically. The estimated value of potential production from England and Wales is put in the range of £6.3 x 10 8 to £1.3 x 10 9 at assumed average 1973 prices. No quantified estimate is considered possible for Scotland.

scholarly journals The analysis of atmospheric factors affecting the value of vertical refraction angle with the assessment of the importance of introduction of the atmospheric amendment

2018 ◽  
Vol 71 ◽  
pp. 00019
Author(s):  
Paulina Kaczor
Keyword(s):  
Laser Beam ◽  
Atmospheric Correction ◽  
Refraction Angle ◽  
Factors Affecting ◽  
Number Of Factors ◽  
Four Seasons ◽  
Vertical Displacements ◽  
Opencast Mines ◽  
Atmosphere Density ◽  
Atmospheric Factors

The study of vertical displacements of hydrotechnical objects, slender constructions, opencast mines or flotation waste reservoirs often requires continuous geodetic monitoring, which in real time defines potential threats resulting from changes in the geometry of the object. In order to ensure high accuracy in determining vertical displacements, a precise robotic tacheometer is used as one of the monitoring sensors. In the case of trigonometric leveling, the quality of measurements is affected not only by the accuracy of the instrument, but also by the centre through which the laser beam emitted by it passes. The radius emitted by the tacheometer due to the layered structure of the atmosphere is deflected, and the angle that it creates with the theoretical course of rays is called the angle of vertical refraction. In order to eliminate the influence of this type of errors, so-called atmospheric correction is introduced to all tacheometric measurements. Currently, total stations automatically determine and introduce corrections for observation, usually using only air temperature and atmospheric pressure. However, the number of factors responsible for the change in atmosphere density, and thus the deflection of the laser beam is much greater. And its influence is also affected by the length of the target and roughness of the area over which the measurement is made. The paper presents the analysis of the significance of various atmospheric and terrain factors that may affect the value of the vertical refraction angle. By the multiple regression method, with the use of the analyzed factors, equations describing the phenomenon of vertical refraction for four seasons have been designated. The defined equation coefficients were used to determine the refraction angle for the observations recorded on the post-flotation waste tank. To confirm the rightness of introducing an additional atmospheric correction, analyses were performed showing the percentage of corrected results.

Water and energy assessment for dewatering in opencast mines

2014 ◽  
Vol 84 ◽  
pp. 736-745 ◽  
Author(s):  
Lalit Kumar Sahoo ◽  
Santanu Bandyopadhyay ◽  
Rangan Banerjee
Keyword(s):  
Energy Assessment ◽  
Opencast Mines
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