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Автор: Grafiati
Опубліковано: 19 червня 2021
Оновлено: 1 лютого 2022

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1

Huang, Xing Xing, Hong Bing Ji, Cai Li, Fei Qin, Qian Li, and Yong Li Liang. "A Comparative Study on the Pollution and Speciation Characteristics of Heavy Metals between the Gold and Iron Mine Tailings of the Upstream Area of Miyun Reservoir, Beijing." Advanced Materials Research 518-523 (May 2012): 1412–16. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.1412.

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In order to have a comparative investigation of the pollution and speciation characteristics of heavy metals between the gold and iron mine tailings of the upstream areas of Miyun Reservoir, the tailing samples from the typical gold and iron mines were analyzed. The total metal concentration is determined by acid digestion and the chemical fractionation of metal by the Tessier sequential extraction method. It is found that compared to background values of Beijing, the heavy metal in both gold and iron mine tailings is higher, while the heavy metal in gold mine tailings is higher than that of iron mine tailings, with Mn as an exception. Mercury is the most serious pollution element in gold mine tailings. Results of the sequential extraction suggest that the exchangeable of Cd exhibits the highest percentage of total metal in gold and iron mine tailings（15% and 6.5% of the total metal, respectively) among Cd, Mn, Zn, Cu, Pb, Cr. In the majority of iron mine tailing samples collected, large amounts of Cu were mainly associated with the organic form. The percentage of the bioavailable metals in both gold and iron mine tailing samples follows the order: Cd>Mn>Zn>Cu>Pb>Cr.
2

Guo, Chengchao, Xuanxuan Chu, and Fuming Wang. "The feasibility of non-water reaction polymer grouting technology application in seepage prevention for tailings reservoirs." Water Supply 18, no. 1 (June 6, 2017): 203–13. http://dx.doi.org/10.2166/ws.2017.096.

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Abstract Tailings reservoirs generally consist of a tailings dam, a tailings conveying system and a drainage system, which are indispensable facilities and provide security and environmental protection for storing tailings and clarifying water in some industries (e.g., metallurgy, non-ferrous building materials, nuclear and chemical industries). Consequently, consolidating seepage prevention and treatment is important. When applied to seepage prevention works for tailings reservoirs, current seepage prevention technologies can cause destruction of the dam and require further construction sites. It is therefore essential to adopt new types of advanced and practical technologies. Aimed at studying the feasibility of the application of non-water reaction polymer grouting technology in seepage prevention of tailings reservoirs and acquiring the properties for practical engineering, an analysis of the environmental impact, chemical resistance and permeability of the polymer material, and the main technical characteristics of the polymer cutoff wall was conducted. The test results showed that the polymer grouting technology applied to seepage prevention works of a tailings reservoir caused little disturbance to the dam, possessed good anti-seepage performance and perfect durability. This study may provide a reference for the seepage control of tailings reservoirs.
3

Zhao, Ren Xin, Wei Guo, Wen Hui Sun, Shi Lei Xue, Bo Gao, and Wen Sun. "Distribution Characteristic and Assessment of Soil Heavy Metal Pollution around Baotou Tailings in Inner Mongolia, China." Advanced Materials Research 356-360 (October 2011): 2730–36. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2730.

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The pollution status and total concentration of soil heavy metals were analyzed around Baotou tailing reservoir located in Inner Mongolia grassland and desert transition zone. Aim of the study is to control soil heavy metal pollution of Baotou tailings and provide the basic data information. The results indicated that concentrations of Pb, Zn and Mn from different directions of the tailing reservoir changed significantly with distance and were higher than the background values of Inner Mongolia. According to the single factor pollution index, soils from different directions were contaminated by Pb, Cu, Zn and Mn. The pollution degree was in order: Mn > Pb > Zn > Cu> Cr > Ni > As. According to Nemerow’s synthetical pollution index, soils collected from the southeast of the tailing reservoir had the most serious heavy metal contamination, the index was 11.1. The order of pollution level in different directions was southeast > northeast > southwest > northwest, which was mainly affected by the dominant wind of northwest. In general, the pollution characteristic and the elements of heavy metal contamination were corresponding with the concentrations of iron tailings. The health and stabilization of environmental quality are being threatened by soil heavy metals.
4

Chen, Liwei, Jun Wu, Jian Lu, Chulin Xia, Michael A. Urynowicz, Zaixing Huang, Li Gao, and Mingying Ma. "Speciation, Fate and Transport, and Ecological Risks of Cu, Pb, and Zn in Tailings from Huogeqi Copper Mine, Inner Mongolia, China." Journal of Chemistry 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/2340542.

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Tailings collected from the tailing reservoir at Huogeqi Copper Mine, located in Inner Mongolia, China, were used in a leachate study to evaluate the acid potential, neutralization potential, and possibility for producing acid mine drainage (AMD) from the site. The speciation of Cu, Pb, and Zn contained in the tailings was also determined during the leachate study to further access the potential migration abilities of these metals. The results showed that the tailings did not produce significant AMD as the pH of the leachate ranged from 7 to 9 and decreased with time. The Cu, Pb, and Zn concentrations were high, ranging from 439.1 to 4527 mg/kg in the tailings and from 0.162 to 7.964 mg/L in the leachate, respectively. Concentrations of metals in the leachate and tailings were positively correlated. Over 60% of the Cu in the tailing samples existed in an oxidizable form. Most of the Pb also existed in its oxidized form, as did the silicate and Zn. Metals usually have higher mobility in their exchangeable and oxidizable forms and as such represent a higher potential risk to the environment. Results of risk assessment code also revealed that metals in tailings exerted medium to high risks to the environment.
5

Meng, Xiaoli. "Detection method for dam deformation of tailing pond based on fault diagnosis algorithm." Thermal Science 24, no. 3 Part A (2020): 1489–96. http://dx.doi.org/10.2298/tsci190609013m.

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The existing methods of dam deformation detection of tailings reservoir have the problems of poor accuracy and slow speed. Therefore, a fault diagnosis algorithm based on tailing dam deformation detection method is proposed. The grey theory is used to accumulate the original feature sequence, and the first cumulative sequence is obtained. Based on this, the grey detection model is constructed, and then the concrete deformation of tailings dam body is accurately detected by precision test. Experimental results show that the method has high accuracy, high speed and practicability
6

Zhang, Pengwei, Liming Hu, Hui Wu, and Lin Zhang. "Mechanical characteristics of mine tailings and seismic responds of tailing reservoir." Japanese Geotechnical Society Special Publication 2, no. 76 (2016): 2633–37. http://dx.doi.org/10.3208/jgssp.chn-06.

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7

Huang, Jie Ying, Xiao Chun Xu, Li Wei Chen, and Yuan Xiang Zhou. "Heavy Metal Migration Rule in Yangshanchong Tailings of Tongling." Advanced Materials Research 573-574 (October 2012): 421–26. http://dx.doi.org/10.4028/www.scientific.net/amr.573-574.421.

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This study investigated the Yangshanchong tailings reservoir to determine the migration of heavy metals in mine tailings. By paralleling to tailings discharge direction, we set 4 sampling profiles, open channel excavation sampling. The results showed that the transfer rates of Cu, As, Hg, Cd, and Pb are relatively fast, while that of Zn is slower. Hg, Cu, Cd, Pb and Zn secondary enrichment appear at 40~80cm. There are some discrepancies in the heavy metal migration characteristics in different places. At the highest part of the tailings reservoir, heavy metal element's content is higher than the other sampling points, heavy metals leaching quantity is small, while in the low-lying areas, Zn, Cu and Cd form a local enrichment in the surface, and also part of heavy metal elements secondary enrichment in less than 100 cm shallow tailings. Surface grass planting can cause some elements to enrich, which might hinder the rehabilitation in the tailings reservoir.
8

Liu, Hai Ming, and Jing Cao. "Study on Automatic Safety Monitoring and Management System of Tailings Reservoir." Advanced Materials Research 663 (February 2013): 1043–48. http://dx.doi.org/10.4028/www.scientific.net/amr.663.1043.

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The tailings dam is a very important component part in mine production facilities. Meanwhile, it is a potential major risk source with high potential energy. Through collecting many accidents of the tailings dam, it is showed that accident type of the tailings dam mainly is dam-break, damage of drainage system, leakage of tailings, etc. On the basis of this analysis, the main causes of dam-break are slope instability, breaking construction rule, unusual rainfall, etc. The automatic safety monitoring and management system of the tailings reservoir (ASMMS) is a powerful measure for mine safety production. The basic frame of the ASMMS is proposed. The main contents and key problems of the ASMMS are also analyzed. It can provide a strong theoretical and technical basis for the safety and management of the tailings dam.
9

Dong, Longjun, Daoyuan Sun, and Xibing Li. "Theoretical and Case Studies of Interval Nonprobabilistic Reliability for Tailing Dam Stability." Geofluids 2017 (September 28, 2017): 1–11. http://dx.doi.org/10.1155/2017/8745894.

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The stability of the operation of a tailing dam is affected by reservoir water level, phreatic line, and mechanical parameters of tailings. The values of these factors are not a definite value in different situations. Meanwhile, the existence of the phreatic line makes it a more complex issue to analyze the stability of the tailing dam. Additionally, it is very hard to give a definite limit to the state of tailing dam from security to failure. To consider the uncertainty when calculating the stability of the tailing dams, interval values are used to indicate the physical and mechanical parameters of tailings. An interval nonprobabilistic reliability model of the tailing dam, which can be used when the data is scarce, is developed to evaluate the stability of the tailing dam. The interval nonprobabilistic reliability analysis model of tailing dam is established in two cases, including with and without considering phreatic line conditions. The proposed model was applied to analyze the stability of two tailing dams in China and the calculation results of the interval nonprobabilistic reliability are found to be in agreement with actual situations. Thus, the interval nonprobabilistic reliability is a beneficial complement to the traditional analysis method of random reliability.
10

Wang, Yong, and Bai Gao. "The Research on the Distribution Characteristics of Heavy Metals in Uranium Mines Soil." Advanced Materials Research 1051 (October 2014): 528–35. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.528.

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A typical paddy field downstream of uranium tailing reservoir was selected to study the distribution of heavy metal and the correlativity of uranium. The results showed that the content of heavy metals in soil has a gradual decreasing trend with increasing distance from the tailings. The contents of Cu、Cd are directly proportional to the vertical depth, the content of Cr is inversely proportional to the vertical depth. Meanwhile, the content of uranium is evidently correlated with Cu and Cr and no correlativity with Cd.
11

Yergeau, Etienne, John R. Lawrence, Sylvie Sanschagrin, Marley J. Waiser, Darren R. Korber, and Charles W. Greer. "Next-Generation Sequencing of Microbial Communities in the Athabasca River and Its Tributaries in Relation to Oil Sands Mining Activities." Applied and Environmental Microbiology 78, no. 21 (August 24, 2012): 7626–37. http://dx.doi.org/10.1128/aem.02036-12.

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ABSTRACTThe Athabasca oil sands deposit is the largest reservoir of crude bitumen in the world. Recently, the soaring demand for oil and the availability of modern bitumen extraction technology have heightened exploitation of this reservoir and the potential unintended consequences of pollution in the Athabasca River. The main objective of the present study was to evaluate the potential impacts of oil sands mining on neighboring aquatic microbial community structure. Microbial communities were sampled from sediments in the Athabasca River and its tributaries as well as in oil sands tailings ponds. Bacterial and archaeal 16S rRNA genes were amplified and sequenced using next-generation sequencing technology (454 and Ion Torrent). Sediments were also analyzed for a variety of chemical and physical characteristics. Microbial communities in the fine tailings of the tailings ponds were strikingly distinct from those in the Athabasca River and tributary sediments. Microbial communities in sediments taken close to tailings ponds were more similar to those in the fine tailings of the tailings ponds than to the ones from sediments further away. Additionally, bacterial diversity was significantly lower in tailings pond sediments. Several taxonomic groups ofBacteriaandArchaeashowed significant correlations with the concentrations of different contaminants, highlighting their potential as bioindicators. We also extensively validated Ion Torrent sequencing in the context of environmental studies by comparing Ion Torrent and 454 data sets and by analyzing control samples.
12

Shu, Yong Bao, Pei Liang Li, and Zhong Xue Li. "Risk Assessment Regarding Tailings Dam Break." Advanced Materials Research 433-440 (January 2012): 1864–68. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.1864.

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An assessment approach in regard to tailings dam break would be analyzed and established in aspects of life, property and environment & resources loss in the essay. Tailings bam break hits local social economy varying with region as a result of particular and specialized space diversity. With the simple and practicable approach, it is quite reasonable to accomplish quantitative assessment of risk as well as review controlling priority to potential risk arising from tailings reservoir.
13

Nierwinski, Helena P., Marcelo Heidemann, Laura A. Lavalle, and Bruna Sell. "Study of mining tailings geotechnical parameters obtained from SCPTu tests carried on dry and saturated layers." MATEC Web of Conferences 337 (2021): 04010. http://dx.doi.org/10.1051/matecconf/202133704010.

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The correct interpretation of in situ and laboratory test results is an important step in the design of mining tailing containment structures. This study aims to analyze the Seismic Cone Penetration Test (SCPTu) results obtained into a mining tailing reservoir composed of two material layers: a thick-dry and a tick-saturated. It is possible to observe that in a same tailing reservoir, the CPTu test interpretation can lead to a classification of each layer as a different soil with specific behavior and properties. This condition demonstrates that tailings with intermediate permeability (10-5 m/s < k < 10-8 m/s) may present partial drainage conditions during a standard cone penetration test (CPTu) (v=20 mm/s), if saturated conditions are verified. The effects of partial drainage can affect test results, and can induce to errors in the prediction of soil behavior and geotechnical parameters. To evaluate the possible effects of partial drainage, in situ test results were compared to laboratory tests results. It was possible to verify that estimated behavior of dry layers, obtained from in situ tests results, present more similarity to the results from laboratory tests. Probably, the partial drainage effects verified through the interpretation of dissipation tests, distorted the estimated behavior of the saturated layer material.
14

Wang, Guang Jin, Xiang Yun Kong, Qiang Liang, and Yue Tong Si. "Study on the Grouting Reinforcement and Stability of a Tailings Initial Dam." Advanced Materials Research 602-604 (December 2012): 1570–73. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.1570.

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The safety operation of tailings initial dam is the necessary conditions to ensure that the tailings dam is steady. In view of the poor construction quality and the appearing of jet shape seepage with the tailings leak in a tailings initial dam, the thesis analyzed the dam composite of tailings initial dam, the study of dam stability was carried out in the different working conditions and the disaster prevention measures was discussed. The research results indicated that the cementation was better and the strength of rock-soil body was higher in the upper dam body of tailings initial dam. However, the gravel cementation was weaker and strength of rock mass was relatively lower in the bottom dam body of that. Based on the poor quality of construction and penetrating seepage with the tailings initial dam, it should be feasible to adopt the grouting reinforcement way so as to reinforce the tailings initial dam. But the grouting pressure should be not more than 0.2 MPa. It will rely on increasing the dam self-respect and decreasing reservoir water level in the grouting process to reduce the risk of landslide. The research results can provide the theory basis on the disaster prevention and control of the tailings initial dam.
15

Jiang, Lv, Wang, Li, and Wang. "Investigation on Direct Shear and Energy Dissipation Characteristics of Iron Tailings Powder Reinforced by Polypropylene Fiber." Applied Sciences 9, no. 23 (November 25, 2019): 5098. http://dx.doi.org/10.3390/app9235098.

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Resource utilization of iron tailings powder is an effective measure to reduce the dam-break risk of an iron tailings reservoir. Adding polypropylene fiber to iron tailings powder can improve its shear performance. Direct shear tests were carried out on reinforced iron tailings powder with polypropylene fiber with dosages of 0%, 0.25%, 0.5%, 0.75%, and 1%, respectively. The normal stresses during the tests were 100, 200, 300, and 400 kPa, respectively. The test results show that with the increase of polypropylene fiber dosage, the cohesive force of iron tailings powder firstly increases and then decreases gradually, and the internal friction angle firstly decreases and then increases. The back propagation (BP)neural network was used to fit the shear force (F) and shear displacement (s) of the test to obtain the F-s function relationship that satisfies the accuracy. Based on the energy dissipation theory, the direct shear energy dissipation of polypropylene-fiber-reinforced iron tailings powder was calculated. The mathematical model of energy dissipation of fiber interfacial failure was derived by the fiber distribution model. The interfacial strength parameters of polypropylene fiber were calculated based on the direct shear test data and the mathematical model of fiber interfacial energy dissipation. The test results show that the addition of polypropylene fiber from the perspective of energy dissipation can improve the shear properties of iron tailings powder.
16

Al, Tom A., and David W. Blowes. "Identification of preferential flow effects on hydraulic conductivity measurements using a fluorescent tracer." Canadian Geotechnical Journal 37, no. 2 (April 1, 2000): 479–84. http://dx.doi.org/10.1139/t99-113.

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Core samples were collected from fractured and unfractured zones within fine-grained, unconsolidated mine tailings. The hydraulic conductivity of the core samples was measured in a constant-head permeameter. A fluorescent dye tracer was added to the constant-head reservoir in the permeameter. The tests were run for approximately 48 h, then the cores were sectioned to observe the distribution of dye. Flow through the fractures results in hydraulic conductivity measurements up to one order of magnitude greater than that of unfractured tailings. Observations of the dye distribution in samples following permeameter measurements are used to identify cases where preferential flow in fractures has influenced the hydraulic conductivity measurements. The dye tracer distribution also indicates where measurement errors may be suspected due to flow leakage around the core sample.Key words: tracers, hydraulic conductivity, fractures, tailings.
17

Gui, Rong, Yu-xiang Pan, De-xin Ding, Yong Liu, and Zhi-jun Zhang. "Experimental Study on Bioclogging in Porous Media during the Radioactive Effluent Percolation." Advances in Civil Engineering 2018 (November 8, 2018): 1–6. http://dx.doi.org/10.1155/2018/9671371.

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The sand columns inoculated with the indigenous microorganism (Aspergillus niger) were used to investigate the effect of bioclogging during the radioactive effluent percolation. The hydraulic gradient, volumetric flow rate, and uranyl ions concentration were monitored over time. The sand columns were operated with continuous radioactive effluent of uranium tailings reservoir. After 68 days, the hydraulic conductivity of the sand columns decreased more than 72%, and the adsorption rate of uranyl ions by Aspergillus niger reached more than 90%. Environmental scanning electron microscope imaging confirmed the biofilm covering the surface of sand particles and connecting sand particles together, which resulted in a reduction of hydraulic conductivity. The results indicated that the propagation of Aspergillus niger can clog the seepage channel and effectively adsorb the uranyl ions of radioactive effluent in the porous media, which provides a suitable measure for controlling the migration of radioactive effluent of uranium tailings reservoir into the subsurface environment.
18

Li, Su Min, Li Wei Yuan, Xiang Xin Li, Zi Fen He, and Jian Bo Xia. "Mud-Sand Flow Hazard Spatial Simulation and Analysis of Tailing Dam-Break under Different Preventive Measures." Materials Science Forum 980 (March 2020): 469–82. http://dx.doi.org/10.4028/www.scientific.net/msf.980.469.

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It is an important precondition and basis for the design of tailings reservoir and its safety facilities by reasonably judging and estimating the mud-sand flow hazard due to dam-break. In this paper, the mud-sand flow hazard scope, extent and spatial state after dam-broken of heightened Mawuqing tailing dam were simulated and analyzed through a flood and debris flow numerical simulation approach, and the hazard risk grade of different spatial locations of downstream Xiaoqingkou(XQK) village was obtained from the simulation. Then the spatial simulation of sand flow hazard under different preventive measures was carried out, and the variation of hazard risk grade at different spatial locations in XQK was obtained. The result of spatial simulation and analysis has shown that if the retaining wall or detention dam is set at the edge of the village, the risk hazard of the village due to dam-break can be reduced after the tailing dam is heightened. At the same time, it can be concluded that to reduce dam break hazard the above local engineering measures are more effective than an overall engineering measures to control the mud-sand flow. The spatial simulation and analysis have provided the basis to make more reasonable engineering decision and protection measures for XQK after the reconstruction of the tailing dam, and also provided the technical support for tailing dam-break accident prevention, the safety management of tailing dam and the mine production safety.
19

Zhou, Saijun, Renjian Deng, and Andrew Hursthouse. "Risk Assessment of Potentially Toxic Elements Pollution from Mineral Processing Steps at Xikuangshan Antimony Plant, Hunan, China." Processes 8, no. 1 (December 25, 2019): 29. http://dx.doi.org/10.3390/pr8010029.

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We evaluated the direct release to the environment of a number of potentially toxic elements (PTEs) from various processing nodes at Xikuangshan Antimony Mine in Hunan Province, China. Sampling wastewater, processing dust, and solid waste and characterizing PTE content (major elements Sb, As, Zn, and associated Hg, Pb, and Cd) from processing activities, we extrapolated findings to assess wider environmental significance using the pollution index and the potential ecological risk index. The Sb, As, and Zn in wastewater from the antimony benefication industry and a wider group of PTEs in the fine ore bin were significantly higher than their reference values. The content of Sb, As, and Zn in tailings were relatively high, with the average value being 2674, 1040, and 590 mg·kg−1, respectively. The content of PTEs in the surface soils surrounding the tailings was similar to that in tailings, and much higher than the background values. The results of the pollution index evaluation of the degree of pollution by PTEs showed that while dominated by Sb, some variation in order of significance was seen namely for: (1) The ore processing wastewater Sb > Pb > As > Zn > Hg > Cd, (2) in dust Sb > As > Cd > Pb > Hg > Zn, and (3) surface soil (near tailings) Sb > Hg > Cd > As > Zn > Pb. From the assessment of the potential ecological risk index, the levels were most significant at the three dust generation nodes and in the soil surrounding the tailings reservoir.
20

Ivanov, Eugen, and Ivan Kovalchuk. "Patterns of formation and functioning of geosystems of Stebnyk tailings dam." GEO&BIO 2021, no. 20 (February 17, 2021): 58–69. http://dx.doi.org/10.15407/gb2008.

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The specifics of the landscape structure within the first section of the Stebnyk tailings dam are considered. Two landscape terrains (of natural and anthropogenic genesis), 3 separate landscape belts, 8 types of landscape tracts, and 30 types of landscape sub-tracts have been identified. Geosystems are dominated by flat sloping surfaces of the tailings dam, the external embanked of which forms closed drainless areas requiring systematic regulation of the level of the final reservoir. Features of filling the tailings surfaces played an important relief-forming role. At the same time, there were raised areas (0.5‒2.5 m) confined to the southern and south-western parts of it. Actually, conditions for the formation of tree-bush and meadow-marsh vegetation of different stages of succession were created in these areas. Spatial-temporal regularities of the occurrence and development of plant communities within the first section of the Stebnyk tailings dam were determined based on the decryption of space images for 2006‒2018. Primary meadow-marsh, bush-meadow, and tree-bush communities on surfaces with different levels of salinization were distinguished. In fact, these communities form the primary succession series in the formation of vegetation cover of post-mining geosystems. To decipher the boundaries of plant communities, 16 space images were obtained from the publicly available Google Earth Pro program. The tendencies of changes in the number and area of the plots occupied by different plant groups have been determined. Currently, the area of tree-bush communities is 5.59 hectares (7.87 % of the total area). Bush-meadow and meadow-marsh communities recorded an intensive increase in areas by 2014, followed by a rapid decrease caused by salinization of areas due to significant elevations of the reservoir’s level. In 2014, maximum areas of plant communities (37.55 ha) were identified, covering more than half of the study area (52.84 %), and in 2018 they occupied 21.71 ha (30.55 %). The gradual differentiation of phytocoenoses by moisture gradients and soil salinization continues. To maintain the rate of overgrowth of the first section of the Stebnyk tailings dam, it is necessary to reduce the level of brines regularly.
21

Dai, Xingwang, Yifan Chen, Yan Chen, Hong Wang, Xiangyang Li, Changshou Hong, and Yong Liu. "Effect of Thickness and Compaction Degree of Overburden Soil on Radon Reduction for Uranium Tailings Reservoir." Science and Technology of Nuclear Installations 2021 (March 20, 2021): 1–8. http://dx.doi.org/10.1155/2021/9984939.

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The thickness and compaction degree of the overburden soil on the beach of the uranium tailings reservoir has an important influence on the radon reduction rate. A theoretical model of radon exhalation is established and an experimental device is designed. The main results are as follows. (1) The radon reduction rate increases with the increase of thickness. When the soil compaction degree is 85.5%, 90.2%, and 94.8%, the radon reduction efficiency increases significantly when the thickness increases from 5 cm to 10 cm, and when the soil thickness is over 10 cm, the increase of radon reduction efficiency tends to be stable. When the compaction degree is 80.9%, the radon reduction rate always increases obviously with the increase of the thickness of the overburden soil, but the increase rate shows a downward trend. (2) The radon reduction rate increases gradually with the increase of compaction degree, and the increasing trend becomes less obvious when the compaction degree is more than 85.5%. Besides, the effect of the change of soil compaction on radon reduction rate decreases with the increase of soil thickness. The calculation formulas about the effect of thickness and compaction degree on radon reduction rate can guide the design and construction of radiation protection of uranium tailings reservoir.
22

Zawadzki, Jarosław, Piotr Fabijańczyk, and Wiktor Treichel. "Monitoring of Groundwater Quality With Cokriging of Geochemical and Geoelectrical Measurements." Multidisciplinary Aspects of Production Engineering 4, no. 1 (September 1, 2021): 97–106. http://dx.doi.org/10.2478/mape-2021-0009.

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Abstract The study presents the possibility of using geostatistical methods for monitoring groundwater quality. Poland is one of the largest copper producers in the world. However, the extraction and production of copper requires constant care for the natural environment. Reservoir Żelazny Most which is situated in South – Western Poland was designed to store flotation tailings out of nearby copper mines. It is one of the biggest industrial dumps in the world. The reservoir stores huge amounts of tailings and industrial water. Water migrating from dump to groundwater could be a potential source of contamination with chlorides, sulphates, heavy metals, and other hazardous substances used in ore separation process in the copper mining industry, like detergent and phenols. Monitoring system around Żelazny Most dump, which was designed to track harmful substances concentrations in groundwater, contains measuring wells and piezometers. They are used to collect groundwater samples for chemical analyses. The idea of the study was to integrate information provided by chemical analyses and geoelectrical measurements by cokriging method, utilizing correlation between electrical resistance of the soil solution and total dissolved solids concentration in groundwater. This enabled to obtain spatial distribution of total dissolved solids concentrations in groundwater at the part of eastern foreground of Żelazny Most dump.
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Cheng, Deqiang, Yifei Cui, Zhenhong Li, and Javed Iqbal. "Watch Out for the Tailings Pond, a Sharp Edge Hanging over Our Heads: Lessons Learned and Perceptions from the Brumadinho Tailings Dam Failure Disaster." Remote Sensing 13, no. 9 (May 2, 2021): 1775. http://dx.doi.org/10.3390/rs13091775.

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A catastrophic tailings dam failure disaster occurred in Brumadinho, Brazil on 25 January 2019, which resulted in over 270 casualties, 24,000 residents evacuated, and a huge economic loss. Environmental concerns were raised for the potential pollution of water due to tailings waste entering the Paraopeba River. In this paper, a detailed analysis has been carried out to investigate the disaster conditions of the Brumadinho dam failure using satellite images with different spatial resolutions. Our in-depth analysis reveals that the hazard chain caused by this failure contained three stages, namely dam failure, mudflow, and the hyperconcentrated flow in the Paraopeba River. The variation characteristics of turbidity of the Rio Paraopeba River after the disaster have also been investigated using high-resolution remote sensing images, followed by a qualitative analysis of the impacts on the downstream reservoir of the Retiro Baixo Plant that was over 300 km away from the dam failure origin. It is believed that, on the one hand, the lack of dam stability management at the maintenance stage was the main cause of this disaster. On the other hand, the abundant antecedent precipitation caused by extreme weather events should be a critical triggering factor. Furthermore, the spatiotemporal pattern mining of global tailings dam failures revealed that the Brumadinho dam disaster belonged to a Consecutive Hot Spot area, suggesting that the regular drainage inspection, risk assessment, monitoring, and early warning of tailings dam in Consecutive Hot Spot areas still need to be strengthened for disaster mitigation.
24

Qi, Qinglan, Liting Zhang, Xiaogang Wang, Shaoxiong Zhang, and Yongqing Wu. "Research on the Model Test of the Debris Landslide’s Evolution Process in Tailings Reservoir." IOP Conference Series: Earth and Environmental Science 304 (September 18, 2019): 042043. http://dx.doi.org/10.1088/1755-1315/304/4/042043.

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Li, Rou-yu, Qiang Li, Sheng Chen, Feng-chang Wu, De-zhi Sun, and Hai-qing Liao. "Distribution of thorium in soils surrounding the rare-earth tailings reservoir in Baotou, China." Journal of Radioanalytical and Nuclear Chemistry 299, no. 3 (November 12, 2013): 1453–59. http://dx.doi.org/10.1007/s10967-013-2814-2.

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26

Sun, Yang, Xiaowei Gu, and Xiaochuan Xu. "Experimental Study on Hydraulic Erosion Characteristics of Ecological Slope of Tailings Reservoir under Rainfall." KSCE Journal of Civil Engineering 25, no. 7 (March 26, 2021): 2426–36. http://dx.doi.org/10.1007/s12205-021-0912-1.

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Chen, Sili, Zhengke Zhang, Sha Chang, Dawei Huang, Licai Hu, Yongxin Bing, and Qingwei Guo. "Emergency treatment of tailings reservoir leakage pollution in watershed – taking manganese pollution as an example." IOP Conference Series: Earth and Environmental Science 199 (December 19, 2018): 022026. http://dx.doi.org/10.1088/1755-1315/199/2/022026.

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Liu, Renzhi, Jing Liu, Zhijiao Zhang, Alistair Borthwick, and Ke Zhang. "Accidental Water Pollution Risk Analysis of Mine Tailings Ponds in Guanting Reservoir Watershed, Zhangjiakou City, China." International Journal of Environmental Research and Public Health 12, no. 12 (December 2, 2015): 15269–84. http://dx.doi.org/10.3390/ijerph121214983.

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Wang, Cong-lu, Chao Wu, Zi-jun Li, and Sheng-guo Xue. "Applied research of correspondence analysis method in waste tailings reservoir heavy metal pollution monitoring points optimization." Journal of Coal Science and Engineering (China) 16, no. 4 (December 2010): 419–23. http://dx.doi.org/10.1007/s12404-010-0416-9.

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30

Mura, José, Fábio Gama, Waldir Paradella, Priscila Negrão, Samuel Carneiro, Cleber de Oliveira, and Waldiza Brandão. "Monitoring the Vulnerability of the Dam and Dikes in Germano Iron Mining Area after the Collapse of the Tailings Dam of Fundão (Mariana-MG, Brazil) Using DInSAR Techniques with TerraSAR-X Data." Remote Sensing 10, no. 10 (September 20, 2018): 1507. http://dx.doi.org/10.3390/rs10101507.

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The Fundão tailings dam in the Germano iron mining complex (Mariana, Brazil) collapsed on the afternoon of 5 November 2015, and around 32.6 million cubic meters of mining waste spilled from the dam, causing polluion with mining waste along a trajectory of 668 km, extending to the Atlantic Ocean. The Sela & Tulipa and Selinha dikes, and the main Germano tailings dam, were directly or indirectly affected by the accident. This work presents an investigation using Advanced-Differential Interferometric Synthetic Aperture Radar (A-DInSAR) techniques for risk assessment in these critical structures during 18 months after the catastrophic event. The approach was based on the integration of SBAS (Small Baseline Subset) and PSI (Persistent Scatterer Interferometry) techniques, aiming at detecting linear and nonlinear ground displacements in these mining structures. It used a set of 48 TerraSAR-X images acquired on ascending mode from 11 November 2015 to 15 May 2017. The results provided by the A-DInSAR analysis indicated an overall stability in the dikes and in the main wall of Germano tailings dam, which is in agreement with in situ topographic monitoring. In addition, it was possible to detect areas within the reservoir showing accumulated values of up to −125 mm of subsidence, probably caused by settlements of the waste dry material due to the interruption of the mining waste deposition, and values up to −80 mm on auxiliary dikes, probably caused by continuous traffic of heavy equipment. The spatiotemporal information of surface displacement of this large mining structure can be used for future operational planning and risk control.
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Sibanda, Timothy, Ramganesh Selvarajan, Titus Msagati, Siddarthan Venkatachalam, and Stephen Meddows-Taylor. "Defunct gold mine tailings are natural reservoir for unique bacterial communities revealed by high-throughput sequencing analysis." Science of The Total Environment 650 (February 2019): 2199–209. http://dx.doi.org/10.1016/j.scitotenv.2018.09.380.

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32

JIANG, Fuliang, Haonan WU, Xueli ZHAO, Yong LIU, Changshou HONG, and Zhe WANG. "CONCENTRATION MEASUREMENT AND CONTROL MEASURES’ STUDY ON WATER RADON IN THE VICINITY OF A URANIUM TAILINGS RESERVOIR." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27 (2019): 1214. http://dx.doi.org/10.1299/jsmeicone.2019.27.1214.

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Jiang, Fuliang, Haonan Wu, Yong Liu, Guan Chen, Jintao Guo, and Zhe Wang. "Comprehensive evaluation system for stability of multiple dams in a uranium tailings reservoir: based on the TOPSIS model and bow tie model." Royal Society Open Science 7, no. 4 (April 2020): 191566. http://dx.doi.org/10.1098/rsos.191566.

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The main purposes of this study are to analyse the evaluation of tailings dam stability under multiple factors and prevent accidents more effectively by proposing a composite risk analysis model. The evaluation model combining the TOPSIS model and bow tie model is presented in this paper. Firstly, a new formula was adopted to calculate the integrated weights based on the subjective and objective weights and the theory of the TOPSIS model was introduced. Secondly, taking a uranium tailings reservoir in south China as an example, the index values and constant weights of the 10 dams are determined according to eight aspects of accumulating dam crest elevation, dam slope, mechanical properties, seepage capacity, topographical conditions, flood control capacity, rainstorm resistance capacity and earthquake resistance capacity. Thirdly, the fitting degree between the stability and ideal solution of each dam is calculated by using the TOPSIS model. The stability fitting degree of the 10 dams is 76%, 93%, 82%, 90%, 66%, 79%, 85%, 96%, 32%, 89% in sequence. This result shows that among the 10 dams, the 9 # dam ranks the lowest in stability. The actual results are in good consistency with those calculated by the TOPSIS model, which can provide a scientific and reliable new idea for the safety of other multi-index comprehensive evaluations. It is worth mentioning that it can still maintain high accuracy of dam stability evaluation under multiple indexes and multiple dams. Also, the comprehensive evaluation model proposed in this paper can more effectively reflect the subtle differences between similar evaluation objects. Fourthly, safety barriers from both the cause of the accident and the consequences was established by using the bow tie model to block the path of the accident, and to propose safety measures to make the evaluation system more complete.
34

Liu, Yuanyuan, Weibo Zhou, Bai Gao, Zhihong Zheng, Gongxin Chen, Qianglin Wei, and Ying He. "Determination of radionuclide concentration and radiological hazard in soil and water near the uranium tailings reservoir in China." Environmental Pollutants and Bioavailability 33, no. 1 (January 1, 2021): 174–83. http://dx.doi.org/10.1080/26395940.2021.1951123.

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35

Mei, Guo Dong, and Zong Zhi Wu. "Research on the Dam-Break Hazard Vulnerability Assessment Index System and Methods of Tailings Pond." Applied Mechanics and Materials 204-208 (October 2012): 3450–56. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3450.

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The method, using slope buckling safety factor to measure the degree of dam-break hazard, results in the unscientific conclusions of identical dam-break risk with respect to the desolate & uninhabited gobi desert and densely populated & highly economic-developed city. On the basis of vulnerability theory, a dam-break hazard vulnerability assessment index system, which comprehensively considering the inherent risks of dam-break and the intrinsic vulnerability of hazard-affected bodies, was established. The production of dam-break hazard-causing factor intensity, including the current dam height, reservoir capacity & downstream main ditch longitudinal, and accident probability by the Monte Carlo method is the inherent risk level of dam-break. The result by the multiplying physical exposure and the intrinsic vulnerability, including household fitness index & the emergency self-help index, as well as the disaster relief capacity is the hazard-affected body vulnerability. Results are contributable to further consummate the vulnerability risk assessment technology and the reliability of dam-break hazard.
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Qin, Yaguang, Jianhua Hu, Dongjie Yang, Ye Kuang, Fengwen Zhao, and Tan Zhou. "Optimization of Transport Performance and Strength of the Filling Slurry in Tailings Reservoir Waste by Adding Air Entraining Agent." Minerals 10, no. 9 (August 19, 2020): 730. http://dx.doi.org/10.3390/min10090730.

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At present, many mines adopt the filling method. It is particularly important to solve the problem of the long-distance transportation of slurry during the filling process. Based on the high-density filling material of Sanning mine, the experiments were designed to add sodium abietate (SA), triterpene saponin (SJ) and sodium dodecyl sulfonate (K12) with concentrations of 0.0%, 0.2%, 0.4% and 0.6%, respectively, which were used as air entraining agents (AEA). The filling body with the curing age of 7 and 28 days was prepared for various tests, including nuclear magnetic resonance (NMR), and alternating current (AC) impedance tests. The effects of the air entraining agent and curing time on the physical properties, pore structure and AC impedance properties of the filling were obtained. The results show that: (1) within the frequency range of 10−1–105 Hz, the variation trend of AC impedance of the filling body cannot be changed by adding the air entraining agent, and the filling body with the same ratio had a similar topological structure. (2) The filling body with different AEA and curing times can be represented by the same equivalent circuit model, while the maximum chi-square coefficient was 0.46%. (3) Under the condition of a high frequency of 105 Hz, the porosity and uniaxial compressive strength of the filling body with 7 day curing age were linearly correlated with the AC impedance. However, the porosity and uniaxial compressive strengths of the filling body with 28 days curing time were affected by the type of AEA at a high frequency of 105 Hz.
37

Liu, Yuanyuan, Weibo Zhou, Haiyan Liu, Qianglin Wei, Bai Gao, and Gongxin Chen. "Spatial variability and radiation assessment of the radionuclides in soils and sediments around a uranium tailings reservoir, south of China." Journal of Radioanalytical and Nuclear Chemistry 324, no. 1 (March 11, 2020): 33–42. http://dx.doi.org/10.1007/s10967-020-07077-w.

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38

Zou, Wenjie, Zichuan Fang, Zhijun Zhang, and Zhenzhen Lu. "Interaction and Adsorption of Hydrophobically Modified Polyacrylamide on Silica and Asphaltene Surfaces." Advances in Polymer Technology 2019 (November 24, 2019): 1–8. http://dx.doi.org/10.1155/2019/5423178.

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The adsorption of polymers affects the cost and oil recovery in oil reservoir exploitation and the flocculation effect in the treatment of oil sand tailings. The adhesion and adsorption of a hydrophobically modified polyacrylamide (HMPAM), i.e., P(AM-NaAA-C16DMAAC), on silica and asphaltene were investigated using surface force measurements, thermodynamic analysis and quartz crystal microbalance with dissipation (QCM-D) measurement. Our study indicates that HMPAM polymer has strong interaction with both silica and asphaltene. The adhesion force of HMPAM on silica was stronger than that on asphaltene surface. Consistently, the adsorption of HMPAM was also greater on silica surface, with a more rigid layer formed on the surface. For HMPAM/silica system, the attractive interaction and the strong adhesion are mainly driven by the hydrogen bonding and electrostatic interaction. For HMPAM/asphaltene system, it is mainly due to hydrophobic interaction between the long hydrocarbon chains of HMPAM and asphaltene. Furthermore, continuous adsorption of HMPAM was detected and multiple layers formed on both silica and asphaltene surfaces, which can be attributed to the hydrophobic chains of HMPAM polymers. This work has illustrated the interaction mechanism of HMPAM polymer on hydrophilic silica and hydrophobic asphaltene surfaces, which provide insight into the industrial applications of hydrophobically modified polymer.
39

JIANG, Fuliang, Zhe WANG, Mingda HAN, Yong LIU, Haonan WU, and Guan CHEN. "NUMERICAL SIMULATION STUDY ON THE RELATIONSHIP BETWEEN THICKNESS OF THE OVERBURDEN AND RADON EXHALATION RATE OF A URANIUM TAILINGS RESERVOIR BEACH BASED ON FLUENT SOFTWARE." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27 (2019): 1241. http://dx.doi.org/10.1299/jsmeicone.2019.27.1241.

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40

Mendoza, Rosendo, Julián Martínez, Javier Rey, M. Carmen Hidalgo, and M. José Campos-Suñol. "Metal(loid)s Transport in Hydrographic Networks of Mining Basins: The Case of the La Carolina Mining District (Southeast Spain)." Geosciences 10, no. 10 (September 28, 2020): 391. http://dx.doi.org/10.3390/geosciences10100391.

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This study analyses the distribution of the total metal(loid)s content accumulated in the sediments of the Grande River, the most important river course that runs through the old mining district of La Carolina (Jaén, Spain), whose waters are collected in an urban supply reservoir. In total, 102 sediments samples were taken along the river, 51 in the live-bed channel and another 51 in the floodplain. The samples analysed have high metal(loid)s content, sometimes much higher than the reference levels established by European and regional legislation for soils, especially Pb, As and Ba, with average values of 5452 mg/kg, 116 mg/kg and 2622 mg/kg, respectively. The statistical analysis of the values obtained allows the distribution of the contents of the different elements along the river to be characterized and the associations and dispersion patterns in the sediments of the metal(loid)s coming from the environmental liabilities of the numerous dumpsites and tailings dams generated by mining activity to be defined. In both cases, the high metal(loid)s content identified as well as the resulting values of various environmental indices (the enrichment factor, contamination factor, geoaccumulation index, potential ecological risk index and pollution load index), confirmed that the sediment samples were moderately to highly contaminated over extensive areas of the basin studied, with the greatest intensity and extent in the floodplain sediments.
41

Zhang, Jin Rui, Ying Li, and Li Bing Zhao. "Cherish the Earth's Mineral Resources and Promote the Comprehensive Utilization of Iron Tailings." Advanced Materials Research 753-755 (August 2013): 8–11. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.8.

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With the increasing amount of tailings, it has brought many serious problems like take up a lot of land, construction and maintenance tailings reservoirs must be consume a large amount of money. The stockpiled tailings is not only bring drawbacks, but also bring huge economic benefits for us. For example, recycling of useful components contained in the tailings, or use the tailings as a whole. This article introduction the tailings status, utilization and point out direction of future development of tailings utilization.
42

He, Xue Wen, Ying Fei Sheng, Kuan Gang Fan, Le Ping Zheng, and Qing Mei Cao. "Design of Tungsten Tailing Reservoir Safety Monitoring and Warning System Based on Wireless Sensor Networks and LabVIEW." Applied Mechanics and Materials 427-429 (September 2013): 1268–71. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.1268.

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In view of the existing flaws of traditional manual observations, a new type of tailing reservoir safety monitoring and warning system based on ZigBee and LabVIEW was designed. The system chose SoC chip CC2530 as the RF transceiver and designed the low-power wireless sensor networks nodes to collect and process the data of tailing reservoir. It chose ZigBee 2007 as the network communication protocol, and uploaded the data to PC by RS232 serial port. The monitoring and warning interface of PC was completed with LabVIEW. The testing results show that the data transmission of the network is stable and the system is suitable for real-time monitoring and warning of the tungsten tailing reservoir.
43

Nagy, Attila, and János Tamás. "Classification of a diffuse heavy metal polluted mining site using a spectral angle mapper." Acta Agraria Debreceniensis, no. 26 (July 16, 2007): 119–23. http://dx.doi.org/10.34101/actaagrar/26/3065.

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Characterization of heavy metal polluted abandoned mining sites is complicated, as the spatial distribution of pollutants often changes dramatically.In our study, a hyperspectral data analysis of the Gyöngyösoroszi abandoned Pb-Zn mine, located in northern Hungary, where Záray (1991) reported serious heavy metal contamination, was carried out using ENVI 4.3. In this area, galena (PbS), goethite (FeO(OH)), jarosite (KFe3(SO4)2(OH)6), sphalerite ((Zn, Fe)S) and pyrite (FeS2) were the predominant minerals in the alteration zones was chosen as the target mineral.Spectral angle mapper (SAM) and BandMax classification techniques were applied to obtain rule mineral images. Each pixel in these rule images represents the similarity between the corresponding pixels in the hyperspectral image to a reference spectrum.As a result of hyperspectral imagery the distribution of pyritic minerals (sphalerite, galena) in the area was defined. Both of the mineral formations occur, especially in mine tailings, the area of the ore preparatory, and the Szárazvölgyi flotation sludge reservoir. According to the results, jarosite and goethite have similar distributions to sphalerite and galena. The results showed that hyperspectral remote sensing is an effective tool for thecharacterization of Pb, Zn and Fe containing minerals at the examined polluted sites and for modelling the distribution of heavy metals and minerals in extensive areas.This classification method is a basis of further detailed investigations, based on field measurements, to map the heavy metal distribution of the studied area and to quantify the environmental risks caused by erosion, which include DEM (digital elevation model) and climatic and hydrological data sources. Furthermore, it can be used primarily to support the potentially applicable phytostabilization technique and to isolate hot spots where only ex-situ remediation techniques can be applied.
44

Gong, J. Z. "Environmental impact analysis of mine tailing reservoir." IOP Conference Series: Earth and Environmental Science 39 (August 2016): 012014. http://dx.doi.org/10.1088/1755-1315/39/1/012014.

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45

Yuan, Li, and Jia Lei. "The Analysis of the Seepage Characteristics of Tailing Dams Based on FLAC3D Numerical Simulation." Open Civil Engineering Journal 9, no. 1 (June 26, 2015): 400–407. http://dx.doi.org/10.2174/1874149501509010400.

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In this paper, the Guangxi’s red mud disposal field is taken as the study area. Appropriate calculating parameters and boundary conditions were selected based on the survey data to build a Mohr-Coul0mb and fluid model under the plane-strain condition. FLAC software was adopted to simulate the distribution of pore water pressure, filtrate seepage paths, and leakage of the dam body under conditions with no anti-seepage design, with partial anti-seepage design and with full anti-seepage design respectively, which provided a technical base for the anti-seepage design of this tailing reservoir. The results showed that this software could better simulate the leakage of red mud tailing dams. The reservoir area displayed obvious leakage characteristics, so full anti-seepage measures and appropriate seepage-proofing materials should be employed to deal with the dam body and the reservoir area to prevent environmental pollution and guarantee the stability of the tailing dams. The method not also can provide the technical reference for the evaluation of anti-seepage works, but also gives important guidance for the anti-seepage works.
46

Song, Zhi Fe, and Qun Wang. "Influencing Factors and Control Measures of the Saturation Line of Tailing Dams." Advanced Materials Research 790 (September 2013): 165–68. http://dx.doi.org/10.4028/www.scientific.net/amr.790.165.

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Given that the current security situation of tailing reservoir is not optimistic in China, and the loss of stability of tailing dam has caused great harm to people's life and property, the article emphasizes the importance of saturation line position to the stability of tailing dam, and analyses several key influencing factors of the saturation line position, at the same time, some measures of controlling the rising of saturation line are put forward to improve the security and stability of tailing dams. In the end, it concludes with a discussion of future research consideration.
47

Castro-Bolinaga, C. F., E. R. Zavaleta, and P. Diplas. "A coupled modelling effort to study the fate of contaminated sediments downstream of the Coles Hill deposit, Virginia, USA." Proceedings of the International Association of Hydrological Sciences 367 (March 3, 2015): 272–80. http://dx.doi.org/10.5194/piahs-367-272-2015.

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Abstract. This paper presents the preliminary results of a coupled modelling effort to study the fate of tailings (radioactive waste-by product) downstream of the Coles Hill uranium deposit located in Virginia, USA. The implementation of the overall modelling process includes a one-dimensional hydraulic model to qualitatively characterize the sediment transport process under severe flooding conditions downstream of the potential mining site, a two-dimensional ANSYS Fluent model to simulate the release of tailings from a containment cell located partially above the local ground surface into the nearby streams, and a one-dimensional finite-volume sediment transport model to examine the propagation of a tailings sediment pulse in the river network located downstream. The findings of this investigation aim to assist in estimating the potential impacts that tailings would have if they were transported into rivers and reservoirs located downstream of the Coles Hill deposit that serve as municipal drinking water supplies.
48

Nardelli, Stefano, Astrid Bettini, Katia Capello, Giuseppe Bertoni, and Alexander Tavella. "Eradication of caprine arthritis encephalitis virus in the goat population of South Tyrol, Italy: analysis of the tailing phenomenon during the 2016–2017 campaign." Journal of Veterinary Diagnostic Investigation 32, no. 4 (June 18, 2020): 589–93. http://dx.doi.org/10.1177/1040638720934055.

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Since 2007, the Autonomous Province of Bolzano–South Tyrol (Italy) has carried out a compulsory eradication program against caprine arthritis encephalitis virus (CAEV) in goats. A drastic seroprevalence reduction was achieved during the initial phase (2007–2011); however, a tailing phenomenon has been observed during the latest years, hampering the achievement of the final goal. CAEV belongs to a group of lentiviruses, called small ruminant lentiviruses (SRLVs), which are antigenically related and can infect both goats and sheep. We investigated the possible link between the tailing phenomenon in goats and the role of sheep as a virus reservoir by comparing serologic results between multispecies farms (where goats and sheep coexist) and monospecies farms (goats only). Goats on multispecies farms had a higher prevalence and seroconversion rate (even if to a rather moderate extent), higher antibody titers, and a higher probability of conclusive results in the genotyping analysis, with more frequent identification of SRLV genotype A (sheep-related) infections. Sheep can serve as a SRLV reservoir, thus contributing to scattered positive tests in goats, causing the tailing phenomenon.
49

Huang, Quan Bi, Hui Li Liu, Yi Nian Zhu, and He Hua Zheng. "Speciation and Mobility of Heavy Metals in Tailings from Dachang Mine, China." Advanced Materials Research 894 (February 2014): 266–70. http://dx.doi.org/10.4028/www.scientific.net/amr.894.266.

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Two carbonate tailing samples were collected from Dachang mine tailing reservoirs, Guangxi Province, China. The chemical speciation of Zn, As, Cd and Sb contained in tailing samples were determined by Dold seven-stage sequential extraction procedure, as well as mineralogical and chemical analysis. Then the potential migration abilities of these heavy metals were evaluated. The tailing analysis results showed that the main minerals were calcite, quartz, sphalerite and pyrite, the major elements were Si, S, Ca, Fe and Al, and the trace heavy metals included Zn, As, Cd and Sb. Zn mainly existed in secondary sulfide, primary sulfides and residual fraction, and As was in primary sulfide and residue, but Sb and Cd was residual fraction. The mobility of heavy metals followed the order: Zn > Sb > Cd > As.
50

范, 书凯. "Prevention Measures of Groundwater Pollution in a Closed Tailing Reservoir." Advances in Environmental Protection 10, no. 04 (2020): 593–98. http://dx.doi.org/10.12677/aep.2020.104073.

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