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1
Jeong, Yongsik, Jaehyung Yu, Lei Wang, and Ji Shin. "Spectral Responses of As and Pb Contamination in Tailings of a Hydrothermal Ore Deposit: A Case Study of Samgwang Mine, South Korea." Remote Sensing 10, no. 11 (2018): 1830. http://dx.doi.org/10.3390/rs10111830.
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We analyzed chemical composition, mineralogy, and spectral characteristics of the tailings of a hydrothermal gold mine in South Korea. We measured spectral responses of tailings to arsenic (As) and lead (Pb) concentration and developed and validated a prediction model for As and Pb in the tailings. The tailing was heavily contaminated with heavy metal elements and composed of rock forming minerals, gangue minerals and hydrothermal alteration minerals. The spectral features of the tailing were closely related to hydrothermal alteration minerals. The spectral responses associated with As and Pb concentrations were detected in shortwave infrared (SWIR) region at absorption positions of the hydrothermal alteration minerals. The prediction models were constructed using spectral bands of absorption features of the hydrothermal alteration minerals and were statistically significant. We found distinctive differences in spectral characteristics and spectral response to heavy metal contamination between the tailings and soils in the mining area. While the spectral signals to heavy metal concentration of tailings were associated with the hydrothermal alteration minerals, those of soils in mining area were manifested by clay minerals originated from weathering processes. This infers that geological processes associated with formation of soils and tailings are the major controlling factors of spectral responses to heavy metal contamination. This study provides a rare reference for the estimation of As and Pb concentration in the tailings with similar types of ore deposit and host rock.
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Kurniawan, Beny, Duryat ., Melya Riniarti, and Slamet Budi Yuwono. "Adaptation Ability of Mahogany (Swietenia macrophylla) against Mercury Contamination from Artisanal and Small-Scale Gold Mining." Jurnal Sylva Lestari 7, no. 3 (2019): 359. http://dx.doi.org/10.23960/jsl37359-369.
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Contamination of mercury (Hg) in illegal gold mining waste could be reduced by the plant. The study aimed to examine the adaptability of mahogany (Swietenia macrophylla) seedling in the growing media of tailings contaminated by mercury. Tailings were taken from the gold refining industry located in Bunut Village, Padang Cermin Sub-district, Lampung Province. The study was designed in a completely randomized design for 5 treatments and 4 replications used combination of topsoil : tailings in a ratio of 100% : 0%; 75% : 25%; 50% : 50%; 25% : 75%; and 0% : 100%. Data were processed by analysis of variance at the 0,05 significance level followed by the Least Significant Difference test. The results showed that mahogany seedling had the adaptability to the media with a maximum tailings concentration of 75%. The higher concentrations of tailings tended to decrease the percentage of life, increment of diameter, increment of the number of leaves, leaf area, the increment of root length, and biomass of mahogany. The higher concentrations of tailings resulted in a better plant height increment compared to the lower concentrations, however, all concentrations of tailings in the planting medium reduced the height of the mahogany seedling.Keywords: Adaptability, mahogany, mercury, tailing
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Bernardino, Angelo F., Fabiano S. Pais, Louisi S. Oliveira, et al. "Chronic trace metals effects of mine tailings on estuarine assemblages revealed by environmental DNA." PeerJ 7 (November 7, 2019): e8042. http://dx.doi.org/10.7717/peerj.8042.
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Mine tailing disasters have occurred worldwide and contemporary release of tailings of large proportions raise concerns of the chronic impacts that trace metals may have on the aquatic biodiversity. Environmental metabarcoding (eDNA) offers an as yet poorly explored opportunity for biological monitoring of impacted aquatic ecosystems from mine tailings and contaminated sediments. eDNA has been increasingly recognized to be an effective method to detect previously unrecognized small-sized Metazoan taxa, but their ecological responses to environmental pollution has not been assessed by metabarcoding. Here, we evaluated chronic effects of trace metal contamination from sediment eDNA of the Rio Doce estuary, 1.7 years after the Samarco mine tailing disaster, which released over 40 million m3 of iron tailings in the Rio Doce river basin. We identified 123 new sequence variants environmental taxonomic units (eOTUs) of benthic taxa and an assemblage composition dominated by Nematoda, Crustacea and Platyhelminthes; typical of other estuarine ecosystems. We detected environmental filtering on the meiofaunal assemblages and multivariate analysis revealed strong influence of Fe contamination, supporting chronic impacts from mine tailing deposition in the estuary. This was in contrast to environmental filtering of meiofaunal assemblages of non-polluted estuaries. Here, we suggest that the eDNA metabarcoding technique provides an opportunity to fill up biodiversity gaps in coastal marine ecology and may become a valid method for long term monitoring studies in mine tailing disasters and estuarine ecosystems with high trace metals content.
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Widojoko, Lilies. "Evaluation the Use of Tailings as a Filler in Asphalt Concrete - Wearing Course Based on Results of Laboratory Tests to the Indonesian Specification for Hot-Mix Asphalt Year 2010." Advanced Materials Research 723 (August 2013): 328–36. http://dx.doi.org/10.4028/www.scientific.net/amr.723.328.
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This paper discusses the use of tailings for road pavement, especially for Asphalt Concrete Wearing Course (AC-WC) based on laboratory test results. The benefits of this study are: (1) diversification of road pavement materials, (2) the use of tailings optimally as road pavement material, (3) reduce the potential for environmental contamination. Tests on the characteristics of the tailings conducted to evaluate the properties related to its performance as a blending component. In this study, the percentage of tailings by 15%, 20% and 25% is added to the AC-WC mixture. Mix design performed by the method of Marshall. In the optimum asphalt content (OAC) the influence of water resistance and resistance to permanent deformation of sample are evaluated. The best performance is use of tailings by 20%. This mixture is not a mixture of the sensitive to inaccuracies in the asphalt mixture compared with the mixture using tailing by 15% and 25%. Wheel tracking test showed that the mixture has the smallest permanent deformation that is 2 mm.While resistance to water and temperature same for all all mixtures. This study shows that the tailings could be used as a road pavement material, which replaces the sand-sized aggregates.
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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.
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Gauthier-Manuel, Honorine, Diane Radola, Flavien Choulet, et al. "A Multidisciplinary Approach for the Assessment of Origin, Fate and Ecotoxicity of Metal(loid)s from Legacy Coal Mine Tailings." Toxics 9, no. 7 (2021): 164. http://dx.doi.org/10.3390/toxics9070164.
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Over the course of history, the development of human societies implied the exploitation of mineral resources which generated huge amounts of mining wastes leading to substantial environmental contamination by various metal(loid)s. This is especially the case of coal mine tailings which, subjected to weathering reactions, produce acid mine drainage (AMD), a recurring ecological issue related to current and past mining activities. In this study, we aimed to determine the origin, the fate and the ecotoxicity of metal(loid)s leached from a historical coal tailing heap to the Beuveroux river (Franche-Comté, France) using a combination of mineralogical, chemical and biological approaches. In the constitutive materials of the tailings, we identified galena, tetrahedrite and bournonite as metal-rich minerals and their weathering has led to massive contamination of the water and suspended particles of the river bordering the heap. The ecotoxicity of the AMD has been assessed using Chironomus riparius larvae encaged in the field during a one-month biomonitoring campaign. The larvae showed lethal and sub-lethal (growth and emergence inhibition and delay) impairments at the AMD tributary and near downstream stations. Metal bioaccumulation and subcellular fractionation in the larvae tissues revealed a strong bioavailability of, notably, As, Pb and Tl explaining the observed biological responses. Thus, more than 70 years after the end of mining operations, the coal tailings remain a chronic source of contamination and environmental risks in AMD effluent receiving waters.
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Wang, Jing, and Wei Xuan Fang. "Primary Investigation and Analysis of Arsenic Contamination in Soil-Plant of Tin Mine in Gejiu." Advanced Materials Research 518-523 (May 2012): 444–52. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.444.
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According to the primary study on the As contamination in soil and crops including potato and pea in tin tailings in Gejiu area, Yunnan Province, it has been found that concentrations of As in rhizosphere far exceed Chinese National Grade Ⅲ standard of soil environmental quality of China (GB 15618-1995). It also has been found that the Ferns were living in the tin tailings suffered from the contamination of heavy metals. Compared with the limit of national criteria for food sanitation in China, the concentrations of As in edible parts of ferns are 90 times. Therefore, the remediation of soil based on geochemical distribution characteristics of heavy metal in the tailings is demanded. And avoiding crops-planting in the tailings to reduce the diffusion of heavy metal contamination in food chain of mining area is necessary.
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Fatoye, Abiodun O., Albert O. Adebayo, and Wasiu B. Tomori. "Multivariate Analysis and Contamination Studies of Elemental Profile in Ife/Ijesa Goldmine Tailings, Southwestern, Nigeria." Sustainable Geoscience and Geotourism 2 (November 2018): 35–43. http://dx.doi.org/10.18052/www.scipress.com/sgg.2.35.
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The concentration of metals in the tailings of Ife/Ijesa goldmine, Nigeria was identified by using Proton Induced X-Ray Emission spectrometry as the main analytical tools. A total of 75 samples of the tailings were collected. Correlation, principal component and cluster analyses suggested probable natural and anthropogenic sources of the metals in the tailings. The contamination level of heavy metals was assessed on the basis of geo-accumulation index (), and ecological risk. The analysis of revealed moderately-heavily to heavily extremely contaminated. The value of showed a low level of heavy metals except Cu which shows considerable contamination.
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Hällström, Lina P. B., Lena Alakangas, and Olof Martinsson. "Scheelite weathering and tungsten (W) mobility in historical oxidic-sulfidic skarn tailings at Yxsjöberg, Sweden." Environmental Science and Pollution Research 27, no. 6 (2019): 6180–92. http://dx.doi.org/10.1007/s11356-019-07305-1.
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AbstractMore knowledge of the geochemical behavior of tungsten (W) and associated contamination risks is needed. Therefore, weathering of scheelite (CaWO4) and secondary sequestration and transport of W to groundwater in historical skarn tailings and surface water downstream of the tailings were studied. The tailings contained 920 mg/kg W, primarily in scheelite. Mineralogical and geochemical analyses were combined to elucidate the geochemical behavior of W in the tailings, and water samples were taken monthly during 2018 to monitor its mobility. In the tailings, a large peak of W was found at 1.5 m depth. There, 30 wt%. of W was present in easily reducible phases, indicating former scheelite weathering. Currently, W is being released from scheelite to water-soluble phases at 2.5 m depth. The release of WO42− is hypothetically attributed to anion exchange with CO32− released from calcite neutralizing acid produced from pyrrhotite oxidation in the upper tailings and transported downwards to pH conditions > 7. Higher concentrations of dissolved W were found in the groundwater and particulate W in downstream surface water than in reference water, but they were lower than current contamination thresholds. Tungsten showed correlations with hydrous ferric oxides (HFO) in both the tailings and surface water.
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West, Anthony CF, Paul J. Van Geel, Kenneth G. Raven, Thanh Son Nguyen, Mahrez Ben Belfadhel, and Peter Flavelle. "Groundwater flow and solute transport in a laboratory-scale analogue of a decommissioned in-pit tailings management facility." Canadian Geotechnical Journal 40, no. 2 (2003): 326–41. http://dx.doi.org/10.1139/t02-108.
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A laboratory-scale analogue of an in-pit tailings management facility (TMF) was constructed using mortar sand, fluorescent-dye-containing ground silica, and filter gravel to represent fractured host rock, tailings, and a pervious surround, respectively. In a series of experiments, the performance of the analogue was observed through collection of hydraulic head, groundwater discharge, and solute concentration data. These data were found to be sufficient to validate numerical simulations of the experiments carried out using FRAC3DVS. The validation exercise indicated that adequate discretization of the tailings' periphery was critical to accurate simulation of early time solute release from the ground silica, while accurate simulation of groundwater flow and hydrodynamic dispersion adjacent to the ground silica was critical to accurate simulation of the down-gradient solute plumes. The validated model was used to predict how the analogue would have performed over its entire "contaminating lifespan." The results of the experiments and subsequent numerical modelling were used to support the argument that, assuming no dissolution of tailings solids, solute mass flux out of a decommissioned in-pit TMF would decrease asymptotically with time from a rate controlled by diffusion at the tailings' periphery towards a steady rate controlled by advection through their core.Key words: tailings, groundwater contamination, in-pit disposal, physical model, numerical model, advection-dispersion.
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Mdumela, Mihloti Nwamahoza, and Fhatuwani Sengani. "Analysis of the potential of acid mine drainage generation from the neutralized coal mining tailings." Journal of Degraded and Mining Lands Management 8, no. 4 (2021): 2925–30. http://dx.doi.org/10.15243/jdmlm.2021.084.2925.
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Mining activities specifically Coal Mining have been long testified to be one of the major contributing factors to environmental crisis, with Acid Mine Drainage (AMD) as one of the leading indicators. The purpose of this study was to assess the potential of AMD generation from neutralized coal mining tailings. In order to achieve the ultimate objective of the study, analysis of chemical composition and mineral content of the tailings using XRF (X-Ray Fluorescence) and XRD (X-Ray Diffraction) respectively, lastly, a static analysis such as ABA (Acid Base Accounting) and TCLP (Toxic Characteristic Leaching Procedure) were also conducted. The results have shown that the studied tailing samples had relatively higher Acid Potential (19 kg CaCO3/t to 20 kg CaCO3/t) versus the Neutralizing Potential (NP) (14 kg CaCO3/t to 18 kg CaCO3/t). It was also found that the Net Neutralizing Potential Ratio (NNPR) is less than zero (-1.5 kg CaCO3/t to -5.40 kg CaCO3/t which indicates that the tailings have the potential to generate acid. The low concentration of CaO indicates acidic potential of the samples because CaO is a buffering mineral. Based on the results of the study, it was concluded that Mine Tailings has the potential to generate acid; therefore, the contamination to the nearby watercourses is extremely possible if necessary remedial actions should be considered.
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Santos, Nelize Lima, Maria Da Conceição Rabelo Gomes, José Ângelo Sebastião Araújo dos Anjos, and Fernanda Gonçalves Cunha. "Multivariate statistical analysis applied to assess the dispersion of contaminants in a mining tailings basin in the semiarid region of Bahia – Brazil." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 15, no. 5 (2020): 1. http://dx.doi.org/10.4136/ambi-agua.2572.
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This study employed multivariate analysis techniques to identify and evaluate the chemical variables responsible for the contamination of the urban area of Boquira, Bahia, due to the abandonment of the tailings basin of Pb-Zn mining, in order to assist in the environmental management of the area. Factor analysis was performed on main and grouping components. The factor analysis allowed grouping the variables into two main factors for street sediment samples, adding up to 72% of the total accumulated variance, and three factors for house dust samples, which explained 77% of the total variance. The variables have a strong correlation with the composition of the tailings basin. Cluster analysis classified the samples according to the concentration of metals in the area, where the influence of the tailings basin and the natural background of the region's rocks in the contamination distribution can be identified.
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Lachhab, Ahmed, El Mehdi Benyassine, Mohamed Rouai, Abdelilah Dekayir, Jean C. Parisot, and Mustapha Boujamaoui. "Integration of Multi-geophysical Approaches to Identify Potential Pathways of Heavy Metals Contamination - A Case Study in Zeida, Morocco." Journal of Environmental and Engineering Geophysics 25, no. 3 (2020): 415–23. http://dx.doi.org/10.32389/jeeg9-067.
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The tailings of Zeida's abandoned mine are found near the city of Midelt, in the middle of the high Moulouya watershed between the Middle and the High Atlas of Morocco. The tailings occupy an area of about 100 ha and are stored either in large mining pit lakes with clay-marl substratum or directly on a heavily fractured granite bedrock. The high contents of lead and arsenic in these tailings have transformed them into sources of pollution that disperse by wind, runoff, and seepage to the aquifer through faults and fractures. In this work, the main goal is to identify the pathways of contaminated water with heavy metals and arsenic to the local aquifers, water ponds, and Moulouya River. For this reason, geophysical surveys including electrical resistivity tomography (ERT), seismic refraction tomography (SRT) and very low-frequency electromagnetic (VLF-EM) methods were carried out over the tailings, and directly on the substratum outside the tailings. The result obtained from combining these methods has shown that pollutants were funneled through fractures, faults, and subsurface paleochannels and contaminated the hydrological system connecting groundwater, ponds, and the river. The ERT profiles have successfully shown the location of fractures, some of which extend throughout the upper formation to depths reaching the granite. The ERT was not successful in identifying fractures directly beneath the tailings due to their low resistivity which inhibits electrical current from propagating deeper. The seismic refraction surveys have provided valuable details on the local geology, and clearly identified the thickness of the tailings and explicitly marked the boundary between the Triassic formation and the granite. It also aided in the identification of paleochannels. The tailings materials were easily identified by both their low resistivity and low P-wave velocity values. Also, both resistivity and seismic velocity values rapidly increased beneath the tailings due to the compaction of the material and lack of moisture and have proven to be effective in identifying the upper limit of the granite. Faults were found to lie along the bottom of paleochannels, which suggest that the locations of these channels were caused by these same faults. The VLF-EM surveys have shown tilt angle anomalies over fractured areas which were also evinced by low resistivity area in ERT profiles. Finally, this study showed that the three geophysical methods were complementary and in good agreement in revealing the pathways of contamination from the tailings to the local aquifer, nearby ponds and Moulouya River.
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Musztyfaga, Elżbieta, Cezary Kabała, Agata Urszula Bielińska, Mateusz Cuske, and Bernard Gałka. "Soil Pollution with Copper, Lead and Zinc in the Surroundings of Large Copper Ore Tailings Impoundment." Ochrona Srodowiska i Zasobów Naturalnych 25, no. 4 (2014): 45–49. http://dx.doi.org/10.2478/oszn-2014-0027.
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AbstractAnalysis of the top-soil total content of heavy metals was carried out inthe vicinity of large copper ore tailings pound in the south-western Poland with regard to soil properties, direction and distance from the tailings pound. None of the soils under study ex-ceeded the limits admitted in the official standards for soil quality, but the assessment made in accordance with IUNG-guidelines to soil contamination determination showed that more than half of the monitoring sites have elevated metal content, Cu, in par-ticular. The results confirmed high effectiveness of dust control preventing its eolian spread from the tailings pound.
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Nazarov, Kh M., K. A. Ermatov, S. M. Bakhronov, S. G. Mukhamedova, and U. M. Mirsaidov. "Assessment of the potential radiation hazard of the Dehmoy tailings pond (Tajikistan) for the population living around it." Radiatsionnaya Gygiena = Radiation Hygiene 12, no. 1 (2019): 115–21. http://dx.doi.org/10.21514/1998-426x-2019-12-1-115-121.
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The paper presents results of radiation monitoring of the Dehmoy tailings pond and the nearest inhabited locality, Goziyon village. It is shown that the average gamma dose rate on the surface of Dehmoy tailings pond reaches 20 μSv/h, density of radon flux from the surface reaches 65 Bq/(m2∙s), and the outdoor radon concentration at the Dehmoy tailings pond varies from 200 to 1000 Bq/m3. It was found that the activity concentration of 238U in the tailing material reaches 980 Bq/kg and the activity concentration of 226Ra reaches 7620 Bq/kg. Potential doses for three hypothetical groups of the population living in the village of Goziyon were assessed and the following sources and ways of exposure were taken into account: external gamma radiation due to soil contamination; internal exposure due to inhalation of 222Rn and its progeny, as well as longlived radionuclides with aerosols from atmospheric air; internal exposure due to ingestion of soil particles. The hypothetical doses range from 0.4 to 17.0 mSv/year. The most significant contributors to the dose are the external gamma radiation and the internal exposure due to inhalation of 222Rn and its progeny. The contribution of internal exposure due to the ingestion of soil particles in the case of working in windy conditions and the lift of dust from the surface of the tailings pond can also be significant. The hypothetical annual doses to three hypothetical groups of the population can be considered as the basis for estimating the safe working time at the tailings pond during its rehabilitation. The calculated dose estimate (up to 17 mSv/year) is rather high and unacceptable compared to the dose limit for the population of 1 mSv/year above the background level.
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Barago, Nicolò, Stefano Covelli, Mara Mauri, Sara Oberti di Valnera, and Emanuele Forte. "Prediction of Trace Metal Distribution in a Tailings Impoundment Using an Integrated Geophysical and Geochemical Approach (Raibl Mine, Pb-Zn Alpine District, Northern Italy)." International Journal of Environmental Research and Public Health 18, no. 3 (2021): 1157. http://dx.doi.org/10.3390/ijerph18031157.
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When mines are decommissioned, tailings piles can act as sources of contamination for decades or even centuries. Tailings, which usually contain high concentrations of metals and trace elements, can be reprocessed for a secondary recovery of valuable elements with an innovative approach to a circular economy. This study offers new results for tailings ponds characterisation and chemical content prediction based on an integrated geophysical-geochemical approach. The study of the Raibl Pb-Zn tailings impoundment was done using bulk chemical analysis on borehole samples, Electrical Resistivity Tomography surveys, and Ground Penetrating Radar measurements. We found valuable and statistically significant correlations between the electrical resistivity of the mining impoundments and the metal distribution, thus providing a practical opportunity to characterise large volumes of metal-bearing tailings. In particular, these results can be useful to aid in the development of environmental monitoring programs for remediation purposes or to implement economic secondary recovery plans.
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Ramappa, Harish Etigemane, and David Muniswamy. "Spatial Distribution of Heavy Metals around the Gold Mine Ore Tailings of Hatti, Karnataka State, India." Landscape & Environment 11, no. 1 (2017): 35–44. http://dx.doi.org/10.21120/le/11/1/4.
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Mining is an imperative segment of the world economy as it contributes socio-economic status of the nations. However, developing countries like India due to lack of high profile industrial techniques and equipment, eluting effluents from the industrial process may contain various hazardous substances which greatly affect the environmental and human health. The present work is aimed with the distribution of heavy metals in and around Hatti Gold Mine Ore Tailing (H-GOT). The results elicit the mine ore tailings are having high-level contaminants of heavy metal than the crop lands of Hatti (Hs), Kotha (Ks), Chikka Nagur (Cs), Tawag (Ts), Lingsugur (Ls) of Raichur District, Karnataka. It was reported that, Hatti Gold Mine ore tailings hold about 41.31±0.49 mg/kg, 2.1±0.31mg/kg, 71.96±3.26 mg/kg, 39.56±1.47 mg/kg and 73.4±2.19 mg/kg of Arsenic (As), Cadmium (Cd), Copper (Cu), Lead (Pb) and Zinc (Zn) heavy metals respectively. While the crop lands metal contamination range depends on seasonal variation. In south-west monsoon farming lands metal contamination order is Hs> Ks>Cs> Ts >Ls, and it was decreased during Post-monsoon. This is the hallmark of the fetching huge amount of toxic heavy metals from mining center to nearest crop lands. The continuous squeezing of these toxic metals could trigger the bio-magnification in both aquatic and terrestrial ecosystem and it may impact various metabolic disorders.
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Araújo, Larissa S. S., Silvana Q. Silva, and Mônica C. Teixeira. "Developing a biosurfactant to attenuate arsenic contamination in mining tailings." Heliyon 7, no. 2 (2021): e06093. http://dx.doi.org/10.1016/j.heliyon.2021.e06093.
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EKYASTUTI, WIWIK, and HANNA ARTUTI EKAMAWANTI. "Short Communication: The role of microbial rhizosphere in enhancing plant growth of Jatropha curcas in soil contaminated mercury." Biodiversitas Journal of Biological Diversity 19, no. 2 (2018): 651–55. http://dx.doi.org/10.13057/biodiv/d190243.
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Ekyastuti W, Ekamawanti HA. 2018. Short Communication: The role of microbial rhizosphere in enhancing plant growth of Jatropha curcas in soil contaminated mercury. Biodiversitas 19: 651-655. Soil in the area of ex-gold mining, has the chemical-physical constraints to the growth of plants. These chemical-physical constraints are low organic matter, poor of nutrient, acid pH, very low CEC, soil texture dominated by sand, and mercury contamination. This area needs to be rehabilitated. Previous research has found that Jatropha curcas as a plant tolerant to mercury. On the other hand, some types of microbial rhizosphere such as arbuscular mycorrhizal fungi (AMF) and mercury reducing bacteria (MRB) also have an ability to reduce mercury. The purpose of this study was to determine the role of microbial components of AMF and MRB in enhancing the growth of J. curcas in tailings contaminated mercury. The study was conducted in two places, in the greenhouse and in the tailing area of ex-gold mining, using factorial completely randomized design. Results showed that interactions between AMF and MRB were simultaneously able to enhance the growth of J. curcas not only in the greenhouse, but also in the field (tailing area). In the greenhouse (nursery), several isolates of Bacillus sp, Bacillus sp + Glomus SS11 and Bacillus sp + Glomus SS18 in the forms of inoculum were very effective in enhancing the seedling growth of J. curcas. However, results were apparently changed after those seedlings were planted in the field (tailings of ex-gold mining). The combination of Bacillus sp. + Glomus SS18 was the best treatment to enhance the growth of J. curcas of all used treatments. This result proves that the role of microbial rhizosphere, especially AMF and MRB, could effectively enhance the growth of J. curcas in tailings contaminated with mercury.
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Wang, Wei-hong, Xue-gang Luo, Zhe Wang, Yu Zeng, Feng-qiang Wu, and Zhong-xiang Li. "Heavy Metal and Metalloid Contamination Assessments of Soil around an Abandoned Uranium Tailings Pond and the Contaminations’ Spatial Distribution and Variability." International Journal of Environmental Research and Public Health 15, no. 11 (2018): 2401. http://dx.doi.org/10.3390/ijerph15112401.
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To investigate the heavy metal and metalloid contamination of soil around a Huanan uranium tailings pond, abandoned in 1998, we defined a study area of 41.25 km2 by a natural boundary and targeted 5 elements’ (U, Mn, As, Pb, Cr) single contamination and comprehensive pollution as the assessment contents. First, we collected 205 samples and evaluated them with the contamination factor (CF) method aiming at judging whether the single target element concentration exceeded the local background value and environmental quality standard. We obtained CF1 (the background value of a certain target element as the baseline value) and CF2 (the environmental quality standard for soils as the baseline value). Second, we evaluated the ecological risk of the key pollutant U with the risk assessment code (RAC) method, taking the 27 samples whose CF2 > 1 as examples and concluded that the environmental risk of U was relatively high and should arouse concern. Third, we selected comprehensive pollution index (CPI) to assess the compound pollution degree of five target elements. Fourth, we constructed the U contamination and CPI’s continuous distribution maps with spatial interpolation, from which we worked out the sizes and positions of slightly, moderately and strongly polluted zones. Finally, we analyzed the spatial variability of U and CPI with the aid of a geostatistical variogram. We deduced that the spatial variation of uranium was in close relationship with local topography, and probably precipitation was the driving force of U contamination diffusion, whereas CPI exhibited weak spatial dependence with random characteristics. The above work showed that 3.14 km2 soil near the pond was fairly seriously polluted, and the other 4 elements’ single contaminations were less serious, but the 5 target elements’ cumulative pollution could not be ignored; there were other potential pollution sources besides the uranium tailings pond. Some emergency measures should be taken to treat U pollution, and bioremediation is recommended, taking account into U’s high bioavailability. Further, special alerts should be implemented to identify the other pollution sources.
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Ali, Mosaad, Shulin Sun, Wei Qian, Abdou Dodo Bohari, Dusabemariya Claire, and Yan Zhang. "Application of Resistivity Method for Mining Tailings Site Selection in Karst Regions." E3S Web of Conferences 144 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202014401002.
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Disposal of mining wastes (tailings) is one of the most severe issues related to groundwater contamination. Therefore, a properly selected disposal site helps to prevent the leakage of dissolved materials in the tailings to groundwater, especially in the karstic area. Where the karstic environment is one of the challenges facing groundwater environmental and engineering issues, for instance, groundwater exploration, vulnerability assessment, and hazard estimation. In this study, the resistivity method with a high-resolution surface data survey was carried out to investigate the pond location selection for mining tailings disposal at El Mochito mine site, northwest Honduras. The results of the two-dimensional (2-D) inversion for sixteen surveyed lines revealed that many low resistivity zones. These zones are related to water/clay-bearing zones that are structurally weak. From lines 8-12, the limestone underneath the surface is the most compact, and this is the best location in the survey area for tailings pond construction. The resistivity method has provided insight into the subsurface information and locating hydraulically conductive zones, so it can be useful for selecting the site of mining tailings.
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Bulatov, K. V., G. I. Gazaleeva, N. A. Sopina, and A. A. Mushketov. "Elaboration and implementation technology of concentration of Magnitogorsk steel-works slime tailings." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 77, no. 5 (2021): 602–9. http://dx.doi.org/10.32339/0135-5910-2021-5-602-609.
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The problems of processing iron ore tailings of wet concentration plants and wastes with high content of iron, contaminated by oil products are actual from both points of view of ecology and economy. One of the reasons restraining solving the problem is absence of technologies ensuring to involve such wastes into industrial turnover. In the process` of the research, composition and opening degree of ore and non-metallic minerals of concentration slime tailing of Magnitogorsk steel-works (MMK) were studied and technology of their concentration was elaborated. Taking into consideration the contamination of initial slime tailings of MMK, it was proposed to accomplish their preliminary de-sliming to remove vegetable remains and clay slimes by disintegration in a screw-toothed crusher and washing in a spiral classifier. Results of wet magnetic separation (WMS) of the initial slime tailings of MMK, made at JSC “Uralmekhanobr” presented, the slimes having natural coarseness of –2.0+0.0 mm. It was established that WMS at the magnetic field intensity of 1500 Oe ensures effective removal of magnetite, aggregates magnetite-hematite-goetite into magnetic product. Iron content in the magnetite concentrate was varying from 61.5 to 62.6%. For processing of slime tailings of MMK, magnetic separation was proposed by high-gradient magnetic separator with permanent magnets, created specially for these purposes by “ERGA” company. To increase iron extraction degree, it was proposed to apply gravitation methods of concentration of nonmagnetic product, obtained at high-gradient WMS. It enabled to increase iron content in the final magnetite-hematite concentrate up to 59%. A technological diagram of oiled slimes processing presented. Tests with oiled slimes of bottom deposits of metallurgical production under pilot-industrial conditions of MMK exhibited a possibility to obtain additional iron concentrate with total iron content of 62.47% while oil content in it was less 0.3%.
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Okereafor, Uchenna, Mamookho Makhatha, Lukhanyo Mekuto, and Vuyo Mavumengwana. "Gold Mine Tailings: A Potential Source of Silica Sand for Glass Making." Minerals 10, no. 5 (2020): 448. http://dx.doi.org/10.3390/min10050448.
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Mining of minerals such as gold, copper, and platinum has been one of several activities sustaining the economy of South Africa. However, the mining sector has contributed significantly to environmental contamination through the improper disposal of mine tailings which covers vast areas of land. Therefore, this study utilised a vitrification process to manufacture glass from gold mine tailings. X-ray fluorescence was used to determine the chemical composition of the tailings while X-ray diffraction was adopted for the mineralogy. The tailings were of granitic composition enriched in potentially toxic elements such as copper, cadmium, zinc, lead, arsenic, and chromium. A representative sample of gold mine wastes of sandy grain size was used in making the glass. Based on composition, the glass was formulated by adding an average 10.0 mass% of CaCO3 and 5.0 mass% of Na2CO3 to 35.0 mass% of SiO2, which resulted in the production of a green-coloured glass.
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Olobatoke, R. Y., and M. Mathuthu. "Heavy metal concentration in soil in the tailing dam vicinity of an old gold mine in Johannesburg, South Africa." Canadian Journal of Soil Science 96, no. 3 (2016): 299–304. http://dx.doi.org/10.1139/cjss-2015-0081.
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Soil contamination with heavy metals is a serious concern to food production and human health. The present study was conducted to evaluate the impact of tailings from an old mining site on heavy metal contamination of soil. Using a GPS to map out different sites around the tailing dam, soil samples were taken from under grassland at the different sites, at depths of 15 cm and 1 m, using a shovel and handheld auger. The samples were prepared, acid digested, and analyzed for a multi-element suite by inductively coupled plasma atomic emission spectrometry. Results showed heavy metal concentration in the order of Cr > Zn > As > Mn > Cu > Pb > Ni > Sr > Hg. Most of the soil samples contained high concentration of As (13.46–234.6 mg kg−1). Soil concentrations of As, Hg, Cr, and Mn also decreased with distance from the dump material. Single contamination index of each pollutant, calculated according to the South African Soil Quality Standards revealed very high and medium pollution grades for As (index = 7.39) and Cr (index = 2.16), respectively. Arsenic is a metal associated with gold ore and soil pollution by such metals can make it infertile and unsuitable for plants.
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Stovern, Michael, Héctor Guzmán, Kyle Rine, et al. "Windblown Dust Deposition Forecasting and Spread of Contamination around Mine Tailings." Atmosphere 7, no. 2 (2016): 16. http://dx.doi.org/10.3390/atmos7020016.
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Goode, Daniel J., and Russell J. Wilder. "Ground-Water Contamination Near a Uranium Tailings Disposal Site in Colorado." Ground Water 25, no. 5 (1987): 545–54. http://dx.doi.org/10.1111/j.1745-6584.1987.tb02884.x.
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Nurcholis, Mohammad, Dwi Fitri Yudiantoro, Darban Haryanto, and Abdurrachman Mirzam. "Heavy Metals Distribution in the Artisanal Gold Mining Area in Wonogiri." Indonesian Journal of Geography 49, no. 2 (2017): 133. http://dx.doi.org/10.22146/ijg.15321.
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Artisanal and small gold mining activity in Wonogiri Regency has long been done with problems on environmental quality. This study was aimed to analyze the levels and spatial distribution of heavy metals in the mining area. Survey of mining and amalgamation sites, sampling the soil and tailings had been conducted. There were 66 samples of soil and tailing were collected, analysis of heavy Fe, Mn, Pb, Hg, As and Co, using X-ray fluorescence (XRF). Normal distribution test of data was conducted using the Kolmogorov-Smirnov and Shapiro Wilk. The spatial distribution of heavy metals was described using Krigging method. Contents of most heavy metals in the area studied were high, except for Co. According to the distribution pattern of heavy metals indicated that the contamination caused by the mining.
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Kim, Kyung Nam, Jin Ho Kim, Dae Yong Shin, Beom Goo Lee, and Hyun Park. "Properties of Cement Paste Using Mine Tailing and Polymer Materials." Materials Science Forum 620-622 (April 2009): 623–26. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.623.
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In this study, mine tailings obtained in a region near to Youngwol Sangdong(Korea) was used to investigate the contamination of heavy metal ions. Some amount of mine tailings and lignin(AE agent) were added in the general cement pastes, of which the compressive strength and leaching rate were investigated. X-ray fluorescence analysis shows that the major constituents of mine tailings are 56.9wt% of SiO2, 10.8wt% of Fe2O3, 11.2wt% of CaO and 11.4wt% of Al2O3, and the major phases are quartz and calcite. In the content of heavy metal ions, the concentration of As ion is the highest as 257.261mg/ℓ. When mine tailings and lignin were added in cement pastes, the compressive strength was higher in the cement pastes adding only lignin. Lignin addition significantly improved the compressive strength of cement pastes by approximately 15% when being cured in distilled water. The compressive strength was lower in the cement pastes adding mine tailings than in the cement pastes not adding. The leaching rates of Cr, Pb and As ion in distilled water were decreased in the cement pastes adding lignin, compared to in the cement pastes not adding. The leaching rates of all heavy metal ions in the cement pastes curing for 28 days were within the maximum permitted limits in KSLT and EPT method. Therefore, it is thought that mine tailings can be used as an ecological material.
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Santos, Alina E., Rocio Cruz-Ortega, Diana Meza-Figueroa, et al. "Plants from the abandoned Nacozari mine tailings: evaluation of their phytostabilization potential." PeerJ 5 (May 4, 2017): e3280. http://dx.doi.org/10.7717/peerj.3280.
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Phytostabilization is a remediation technology that uses plants for in-situ stabilization of contamination in soils and mine tailings. The objective of this study was to identify native plant species with potential for phytostabilization of the abandoned mine tailings in Nacozari, Sonora in northern Mexico. A flora of 42 species in 16 families of angiosperms was recorded on the tailings site and the abundance of the most common perennial species was estimated. Four of the five abundant perennial species showed evidence of regeneration: the ability to reproduce and establish new seedlings. A comparison of selected physicochemical properties of the tailings in vegetated patches with adjacent barren areas suggests that pH, electrical conductivity, texture, and concentration of potentially toxic elements do not limit plant distribution. For the most abundant species, the accumulation factor for most metals was <1, with the exception of Zn in two species. A short-term experiment on adaptation revealed limited evidence for the formation of local ecotypes inProsopis velutinaandAmaranthus watsonii. Overall, the results of this study indicate that five native plant species might have potential for phytostabilization of the Nacozari tailings and that seed could be collected locally to revegetate the site. More broadly, this study provides a methodology that can be used to identify native plants and evaluate their phytostabilization potential for similar mine tailings.
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Świdziński, Waldemar. "Modeling groundwater flow and salinity evolution near TSF Żelazny Most. Part I – groundwater flow." E3S Web of Conferences 54 (2018): 00036. http://dx.doi.org/10.1051/e3sconf/20185400036.
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Tailings which are by-product of the extraction of various metals (copper, gold, silver, molybdenum, etc.) are often stored in so called Tailings Storage Facilities (TSF), where they are deposited as a soil-water mixture by spigotting. In many cases the water discharged together with tailings to the TSF is rich in salts and other chemical compounds imposing negative pressure to the groundwater environment. Even in the case of total or partial lining of such facilities and well-developed drainage systems to control leaching, some portion of contaminated water often seeps either through the surrounding dams or the bed into adjacent groundwater bodies. Numerical models can be very helpful tools to assess the extent of the contamination and particularly to predict its potential development in the future. This paper and the companion one describe such a numerical model developed for Żelazny Most Tailings Storage Facility (south-west Poland), one of the world’s largest tailings sites. In the first part general information about the facility is provided and a 3D hydrogeological numerical model of the structure is described. Groundwater flow pattern near the facility obtained from numerical simulations is confronted with the measurements from a comprehensively developed monitoring system. Part II will be focused on the modelling of chloride transport in groundwater.
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Ferreira, Amanda D., Hermano M. Queiroz, Maira P. Kaneagae, et al. "Gypsum Amendment Induced Rapid Pyritization in Fe-Rich Mine Tailings from Doce River Estuary after the Fundão Dam Collapse." Minerals 11, no. 2 (2021): 201. http://dx.doi.org/10.3390/min11020201.
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Mine tailings containing trace metals arrived at the Doce River estuary, after the world’s largest mine tailings disaster (the Mariana disaster) dumped approximately 50 million m3 of Fe-rich tailings into the Doce River Basin. The metals in the tailings are of concern because they present a bioavailability risk in the estuary as well as chronic exposure hazards. Trace metal immobilization into sulfidic minerals, such as, pyrite, plays a key role in estuarine soils; however, this process is limited in the Doce River estuarine soil due to low sulfate inputs. Thus, to assess the use of gypsum amendment to induce pyritization in deposited tailings, a mesocosm experiment was performed for 35 days, with vinasse added as carbon source and doses of gypsum (as a sulfate source). Chemical and morphological evidence of Fe sulfide mineral precipitation was observed. For instance, the addition of 439 mg of S led to the formation of gray and black spots, an Fe2+ increase and decrease in sulfides in the solution, an increase in pyritic Fe, and a greater Pb immobilization by pyrite at the end of the experiment. The results show that induced pyritization may be a strategy for remediating metal contamination at the Doce River estuary.
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Mokgalaka, Ntebogeng S., Sello P. Lepule, Thierry Regnier, and Sandra Combrinck. "Near-infrared spectroscopy and chemometrics for rapid profiling of plant secondary metabolites." Pure and Applied Chemistry 85, no. 12 (2013): 2197–208. http://dx.doi.org/10.1351/pac-con-13-02-09.
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In this study, near-infrared (NIR) spectroscopy, in combination with chemometrics, was used as a rapid tool for determining if exposure to contamination from mine tailings influences the matrices of the specimens, compared to those from natural populations. Principal component analysis (PCA) plots were made from the chemometric models obtained to establish if season of harvest, geographical origin, and level of soil contamination play a determining role in the chemical profiles of the individual specimens harvested from mine sites or natural populations. The random distribution on PCA score plots corroborated the intraspecies variation of Lippia scaberrima previously observed by gas chromatography-flame ionization detection (GC-FID) and gas chromatography-mass spectrometry (GC-MS) essential oil profiles. Clustering according to the season and origin of the individual plants confirmed that the geographic location and the season of harvest influence the chemical profiles of L. scaberrima. The NIR data could not be correlated with the level of soil contamination to which the specimens were exposed. The PCA scores and loadings plots obtained from NIR data of Searsia pendulina suggest that the species is tolerant to pollution from mine tailings. Although separation was obtained in a three-component PCA model between specimens sampled during different seasons, some clustering was observed by specimens from the same geographical origin.
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Cao, Xiu Feng, and Li Ping Liu. "Using Microorganisms to Facilitate Phytoremediation in Mine Tailings with Multi Heavy Metals." Advanced Materials Research 1094 (March 2015): 437–40. http://dx.doi.org/10.4028/www.scientific.net/amr.1094.437.
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During mining activities, a large amount of wastes in the form of mine tailings were discharged, leading to a global problem in soil and water contamination. Phytoremediation was considered to be a potential method for remediation of mine wastes as vegetation can promote remediation for sustainable development of mine waste sites. Recently, studies were conducted to utilize microorganisms such as plant growth-promoting bacteria, or filamentous fungi to facilitate phytoremediation by increasing the plant biomass production, bioavailability of heavy metals (HMs), enhancing the plant uptake of HMs or reduce toxicity of HMs to plants. Some species of microorganisms can be beneficial to phytoremediation in the mine tailings contaminated with HMs.
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Garga, Vinod K., and Miguel de la Torre. "Emergency remediation of instability at Caudalosa tailings dam, Peru: a case history." Canadian Geotechnical Journal 39, no. 5 (2002): 1193–200. http://dx.doi.org/10.1139/t02-045.
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This paper describes the instability in the foundation of the Caudalosa tailings dam in Peru. The instability threatened collapse of the structure along with the risk of unacceptable contamination of the River Escalera, located immediately downstream of the toe of the dam. At the time of these investigations, large deformations were in progress. The head scarp of the potential slide, located in the stored tailings, had reached a height of 2 m. Visual observations, as well as subsurface investigations, indicated that the instability was due to the presence of soft to medium plastic clay in the foundation. Emergency stabilization was successfully achieved by the construction of large trenches at the downstream toe, allowing the low consistency clay to be removed and backfilled with compacted mine waste rock. Other secondary stabilizing measures that were undertaken are also described.Key words: clay, dam, instability, remediation, stabilization, slide, tailings.
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Lam, Elizabeth J., Italo L. Montofré, Fernando A. Álvarez, Natalia F. Gaete, Diego A. Poblete, and Rodrigo J. Rojas. "Methodology to Prioritize Chilean Tailings Selection, According to Their Potential Risks." International Journal of Environmental Research and Public Health 17, no. 11 (2020): 3948. http://dx.doi.org/10.3390/ijerph17113948.
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For centuries, Chile has been a territory with significant mining activity, resulting in associated social benefits and impacts. One of the main challenges the country faces today is the presence of a great number of mine tailings containing heavy metals, such as Cu, Cr, Ni, Zn, Pb, As, Cd, and Fe, which make up a potential risk for the population. This study is intended to develop a methodology for determining tailings requiring urgent treatment in Chile, based on risks associated with heavy metals. Geochemical data from 530 Chilean tailings were compared to the Dutch norm and the Canadian and Australian soil quality guidelines for residential use. Additionally, criteria about residents and water bodies were used, considering a 2-km area of influence around tailings. To do this, QGIS (Böschacherstrasse 10a CH-8624 Grüt (Gossau ZH), Zurich, Switzerland), a geospatial tool, was used to geolocate each deposit, considering regions, communes, rivers, lakes, and populated areas. To evaluate potential ecological contamination risks, Hakanson’s methodology was used. Results revealed the presence of 12 critical tailings in Chile that require urgent treatment. From the 530 tailings evaluated, 195 are located at less than 2 km from a populated area and 154 at less than 2 km from a water body. In addition, 347 deposits require intervention: 30 on Cu, 30 on Cr, 13 on Zn, 69 on Pb, 138 on As, 1 on Cd, and 5 on Hg.
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Boussen, Salma, Abdelaziz Sebei, Marilyne Soubrand-Colin, Hubert Bril, Fredj Chaabani, and Saadi Abdeljaouad. "Mobilization of lead-zinc rich particles from mine tailings in northern Tunisia by aeolian and run-off processes." Bulletin de la Société Géologique de France 181, no. 5 (2010): 459–71. http://dx.doi.org/10.2113/gssgfbull.181.5.459.
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Abstract Dispersion of metal rich particles from mine tailings is an important hazard for the environment. Specially, in Mediterranean context, this is potentially more risky because of the violence of climatic events. Northern Tunisia includes about 50 mining districts with an ore mineralogy consisting mainly of galena, iron sulphides and subordinate sphalerite embedded in a calcitic and baritic gangue. A century of mining exploitation left waste rich in potentially toxic elements (PTE) with values up to 46900 mg/kg for Pb and 49501 mg/kg for Zn, stored in uncontrolled and untreated deposits. The PTE contents observed in the surrounding soils generally devoted to agricultural activities are as high as 12488 mg/kg for Pb, 3485 mg/kg for Zn and 15 mg/kg for Cd. The contents in sediments downstream are also high, in the range of 47800 mg/kg for Pb, 5767 mg/kg for Zn and 36 mg/kg for Cd. PTE-bearing phases are mainly sulphides, carbonates and iron oxyhydroxydes. Because of the lack of vegetation and the presence of fine particles in the mining wastes, PTE were dispersed to nearby areas, resulting in the contamination of agricultural soils and river sediments. Under the Mediterranean climate which includes a long dry summer with windy episodes and heavy rainfall in the winter, mine tailings are exposed to two types of erosion: hydraulic erosion with transport during heavy rainfall events and aeolian erosion inducing fine particle dispersion. Dispersion of the PTE from mine tailings in northern Tunisia presents a risk of environmental contamination and of toxicity by inhalation for the habitants near the former mining districts. Furthermore these PTE can be transferred from agricultural soils surrounding the tailings to the cultivated plants (mainly cereals).
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Rincheval, Madeline, David R. Cohen, and Frank A. Hemmings. "Biogeochemical mapping of metal contamination from mine tailings using field-portable XRF." Science of The Total Environment 662 (April 2019): 404–13. http://dx.doi.org/10.1016/j.scitotenv.2019.01.235.
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Zhao, Guangjie, Xianqing Li, Jiewang Zhu, Xueyan Zhao, Jizhen Zhang, and Jia Zhai. "Pollution Assessment of Potentially Toxic Elements (PTEs) in Soils around the Yanzhuang Gold Mine Tailings Pond, Pinggu County, Beijing, China." International Journal of Environmental Research and Public Health 18, no. 14 (2021): 7240. http://dx.doi.org/10.3390/ijerph18147240.
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The accumulation of tailings from gold mining and smelting may result in PTE pollution. We investigated PTE contamination from a large amalgamated gold mine tailings pond in Pinggu County, Beijing. In November 2017, 30 soil samples were collected around the tailings pond. The concentrations and pollution degree of PTEs in the samples and the sources of Sb, As, Cd, Cu, Pb, Zn and Hg were analyzed. The average concentration of these elements in soil samples near the tailings pond (16.24, 28.29, 0.99, 171.04, 263.25, 99.73, 0.72 mg/kg, respectively) were higher than their corresponding standard values and background values of the study area. The geoaccumulation index showed that the pollution degree of As, Pb and Hg was moderate, while Sb and Cu present non-pollution to moderate pollution. The average EF values of the elements were Sb (38.31), As (4.23), Cd (0.71), Cu (3.68), Pb (21.24), Zn (0.82) and Hg (5.29), respectively. The environmental risk assessment developed throughout the PERI method indicated that Sb, As, Hg and Pb were the main pollutants in the study area. The three quantitative risk indicators (RI, Igeo and EF) were positively correlated, and all of them indicated that PTEs had significant pollution to the local area. Thus, Sb, As, Pb, Cu, and Hg pollution should be highly concerning. Multivariate statistical analysis shows that the pollution of PTEs was mainly caused by the accumulation of tailings ponds after gold mining and smelting. The research result is of great significance for the prevention and control of soil pollution of PTEs near the tailings pond.
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BOUMAZA, Bilal, and Tatyana Vladimirovna CHEKUSHINA. "Assessment of metallic trace elements contamination in a mining area of the processing of Djebel Onk phosphate ore (Algeria)." NEWS of the Ural State Mining University 1 (March 15, 2021): 7–16. http://dx.doi.org/10.21440/2307-2091-2021-1-7-16.
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Research relevance. Phosphate mining activities are one of the main sources of contamination by heavy metals since they harmfully affect the soil and lead to the degradation of the ecosphere. Research aim. This study aims at characterizing and evaluating the metallic contamination of soils in the vicinity of the Djebel Onk mine in the town of Bir El Ater (Wilaya of Tébessa) in eastern Algeria, and particularly focusing on estimating the spatial variability of this contamination and the extent of the contaminated area. Methodology. The physicochemical characteristic (pH) was determined by pH-meter, whereas AAS was used for the determination of heavy metals (Pb, Cu, Zn, Cd) in the examined soil Research results. The results reveal that soils that are close to the mine site studied and even those that are far away are heavily contaminated with heavy metals — lead (Pb), zinc (Zn), copper (Cu) and cadmium (Cd); the results also point out to a high variability of concentrations not only between sampling sites but also within the same mine site. The analysed soil pollution index is generally high even for soils sampled downstream more than 30 km from the mine site, whereas it is extremely high on the surface of the tailings slopes, underlining the fact that tailings are considered perennial sources of heavy metal contamination in their current state. Conclusion. The unhealthy area affected by metal pollution from mining sites in the Djebel Onk is very large as a result of the dispersion, by wind and water transport, of residual pollutants from the mine wastes abandoned on site. Remediation measures must be put into place to immobilize the pollutants and limit their spread to the environment Keywords: Soil contamination, Algeria, heavy metals, phosphate mine, pollution index.
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Dunca, Emilia-Cornelia, Tiberiu Rusu, and Dorin Iancu. "Identification of pollution sources in closed mining sites with an Impact on the quality of surface water in the Brad area." MATEC Web of Conferences 342 (2021): 03012. http://dx.doi.org/10.1051/matecconf/202134203012.
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Pollution caused by closed mining activities is particularly difficult to treat because it dates back a very long time. Water contamination results from large-scale disturbance of the land on which the underground exploitation of the useful mineral substance took place. Discharges from underground mines can be treated as diffuse point sources; water quality is due to reactions that occur in an area that can cover tens of square kilometres. The main sources are groundwater, which increases after the pumping is stopped, and tailings stored in dumps and tailings ponds. When the mine closes, the pumps are stopped and the groundwater level rises until it reaches the surface or discharges into the aquifers above. Although discharges from wells and galleries are often the most visible sources, surface activities such as mineral processing, tailings and waste disposal are also a significant source of pollution. The river is located on the Barza gold-silver ore mining operation took place. The runoff waters present in this perimeter can transport contaminated sediments, where the tailings dumps are washed away by precipitation. The paper aims to identify the sources of surface water pollution in the Barza closed mining site that influences the quality of surface water.
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Wielinga, Bruce, Juliette K. Lucy, Johnnie N. Moore, October F. Seastone, and James E. Gannon. "Microbiological and Geochemical Characterization of Fluvially Deposited Sulfidic Mine Tailings." Applied and Environmental Microbiology 65, no. 4 (1999): 1548–55. http://dx.doi.org/10.1128/aem.65.4.1548-1555.1999.
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ABSTRACT The fluvial deposition of mine tailings generated from historic mining operations near Butte, Montana, has resulted in substantial surface and shallow groundwater contamination along Silver Bow Creek. Biogeochemical processes in the sediment and underlying hyporheic zone were studied in an attempt to characterize interactions consequential to heavy-metal contamination of shallow groundwater. Sediment cores were extracted and fractionated based on sediment stratification. Subsamples of each fraction were assayed for culturable heterotrophic microbiota, specific microbial guilds involved in metal redox transformations, and both aqueous- and solid-phase geochemistry. Populations of cultivable Fe(III)-reducing bacteria were most prominent in the anoxic, circumneutral pH regions associated with a ferricrete layer or in an oxic zone high in organic carbon and soluble iron. Sulfur- and iron-oxidizing bacteria were distributed in discrete zones throughout the tailings and were often recovered from sections at and below the anoxic groundwater interface. Sulfate-reducing bacteria were also widely distributed in the cores and often occurred in zones overlapping iron and sulfur oxidizers. Sulfate-reducing bacteria were consistently recovered from oxic zones that contained high concentrations of metals in the oxidizable fraction. Altogether, these results suggest a highly varied and complex microbial ecology within a very heterogeneous geochemical environment. Such physical and biological heterogeneity has often been overlooked when remediation strategies for metal contaminated environments are formulated.
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Bania, Grzegorz. "ERT method in the study of chemical pollution of the hydrogeological environment - numerical analysis of 2D and 3D models." E3S Web of Conferences 66 (2018): 01007. http://dx.doi.org/10.1051/e3sconf/20186601007.
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Electrical resistivity tomography (ERT) method is often used to solve problems related to chemical pollution of the hydrogeological environment. The source of such contamination can be, e.g. industrial heaps, tailings ponds and municipal landfills. The contaminants spreading often takes the form of a (3D) pollution tongue. In this case, the standard interpretation of 2D ERT surveys may be difficult. Numerical modeling was carried out in order to show the specificity of pollutants propagation. Both 2D and 3D models were analysed. Those refer to the real geological situation - vicinity of Nowa Huta (Krakow, Poland) - where heaps and tailings ponds of the metallurgical plant are present. An appropriate geoelectrical model referring to the above situation was prepared. It was assumed that highly mineralized waters in the form of a contamination tongue are spreading within the aquifer. Resulting interpreted resistivity distributions for 2D and 3D variant of ERT method were analysed. It has been shown that the method is promising in terms of the ability to detect and assess the nature of the transitional zone between clean and contaminated waters. Additionally, it has been shown that 3D modeling can be a useful, complementary element in interpreting the results of DC-resistivity methods.
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Myagkaya, Irina, Maria Gustaytis, Ivan Kirichenko, Bagai-ool Saryg-ool, and Elena Lazareva. "Acid Mine Drainage Contamination of the Ur Impoundment: Environmental Geochemistry." E3S Web of Conferences 98 (2019): 09021. http://dx.doi.org/10.1051/e3sconf/20199809021.
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Water, particulate matter, and bottom sediments of the Ur impoundment used for fishing have been analyzed in terms of environmental geochemistry. The impoundment is located within the dispersion train of gold-bearing sulfide tailings at the Ur ore field and has been contaminated by acid mine drainage (AMD). The depth-dependent distribution of elements in the bottom sediments corresponds to (1) pre-mining, (2) early mining, and (3) post-mining (present) stages. Sediment enrichment in Cu, Cd, Fe, Pb, Zn, As and Hg depends on their speciation and migration patterns in water. The concentrations of many elements in water and bottom sediments exceed maximum allowable values. Hg occurring as the most toxic methyl compound poses the greatest hazard.
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Menshikova, Elena, Viacheslav Fetisov, Tatyana Karavaeva, Sergey Blinov, Pavel Belkin, and Sergey Vaganov. "Reducing the Negative Technogenic Impact of the Mining Enterprise on the Environment through Management of the Water Balance." Minerals 10, no. 12 (2020): 1145. http://dx.doi.org/10.3390/min10121145.
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In terms of anthropogenic impact of mining and processing enterprises, the adjacent territories are contaminated by upstream tailings dams. The contamination is developed by active seepage of liquid waste through the body of the dams. The authors have analyzed water balance at the Kachkanar Mining and Processing Plant tailings dump (Russia, Ural Region). The company develops vanadium-containing titanium-magnetite iron ores with low ore (15%). This, along with high productivity, has determined the formation of a large number of tailings and significant amount of wastewater. The purpose of the studies is to substantiate the need to manage the seepage discharge process by means of enclosing dams to ensure environmentally safe operation of the tailings dump. The research objectives included field measurements of seepage volumes, their evaluation by computational methods and analysis of anthropogenic geochemical load on natural waters. The obtained results show an increase in seepage discharge volume from 41.91 million m3 (in 2017) to 81.44 million m3 (in 2026) as the height of the dams increases. These losses will lead to water shortages in the enterprise’s water recycling system. Calculation of pollutants in wastewater with the exception of natural component showed the leading role of technogenic factor in the content of Ti (up to 84%), V (up to 96%), Co (up to 86%) and Mo (up to 93%). Increasing the volume of seepage discharge will lead to an increase in natural water pollution within the area. Ecologically efficient management of the enterprise’s water balance is ensured by the use of tailings thickening technology and implementation of closed water supply systems.
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Gbadebo, A. M., and Y. A. Ekwue. "Heavy metal contamination in tailings and rocksamples from an abandoned goldminein southwestern Nigeria." Environmental Monitoring and Assessment 186, no. 1 (2013): 165–74. http://dx.doi.org/10.1007/s10661-013-3363-4.
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Yi, Ji Min, Jin Soo Lee, and Hyo Taek Chon. "Arsenic Contamination and its Speciation in the Water System around the Abandoned Dongil Au-Ag Mine in Korea." Key Engineering Materials 277-279 (January 2005): 503–9. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.503.
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This study was made to investigate the extent and degree of As contamination in waters and sediments influenced by previous mining activity in the abandoned Dongil Au-Ag mine. Arsenic species was also identified in surface waters and groundwater. The chemical form of As in sediments was examined using sequential extraction analysis. The major contamination source of As in the mine area is suggested to be tailings with elevated levels of 8,718 As mg/kg. This was associated with the release of high level of As into the water system in the study area. The pH values of water samples ranged from 7.7 to 10.1, which was neutral to strong alkaline due to buffering effect by high concentration of Ca and Mg dissolved from carbonate mineral and weathering of concrete. Stream waters contained high level of As within the range of 40.5 to 150.4 ㎍/L and most waters exceeded the permissible level (50 ㎍/L) of As for stream water in Korea. The concentration ratios of As(Ⅲ) to As (total), however, extended in the range of 5.8 to 75% and increased at low pH condition in stream waters. Arsenic concentration in sediments digested by aqua regia (HNO3+HCl) ranged from 162 to 2,077 mg/kg. The highest concentration of As may be due to the direct inflow of tailings. The relatively high percentage (17.1~35.3%) of As coprecipitated with amorphous Fe oxyhydroxides indicates that more severe contamination of As can occur by re-extracting due to changes of chemical environment such as reducing condition.
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Shafiei, Farhad, Mathew P. Watts, Lukas Pajank, and John W. Moreau. "The effect of heavy metals on thiocyanate biodegradation by an autotrophic microbial consortium enriched from mine tailings." Applied Microbiology and Biotechnology 105, no. 1 (2020): 417–27. http://dx.doi.org/10.1007/s00253-020-10983-4.
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Abstract Bioremediation systems represent an environmentally sustainable approach to degrading industrially generated thiocyanate (SCN−), with low energy demand and operational costs and high efficiency and substrate specificity. However, heavy metals present in mine tailings effluent may hamper process efficiency by poisoning thiocyanate-degrading microbial consortia. Here, we experimentally tested the tolerance of an autotrophic SCN−-degrading bacterial consortium enriched from gold mine tailings for Zn, Cu, Ni, Cr, and As. All of the selected metals inhibited SCN− biodegradation to different extents, depending on concentration. At pH of 7.8 and 30 °C, complete inhibition of SCN− biodegradation by Zn, Cu, Ni, and Cr occurred at 20, 5, 10, and 6 mg L−1, respectively. Lower concentrations of these metals decreased the rate of SCN− biodegradation, with relatively long lag times. Interestingly, the microbial consortium tolerated As even at 500 mg L−1, although both the rate and extent of SCN− biodegradation were affected. Potentially, the observed As tolerance could be explained by the origin of our microbial consortium in tailings derived from As-enriched gold ore (arsenopyrite). This study highlights the importance of considering metal co-contamination in bioreactor design and operation for SCN− bioremediation at mine sites. Key points • Both the efficiency and rate of SCN−biodegradation were inhibited by heavy metals, to different degrees depending on type and concentration of metal. • The autotrophic microbial consortium was capable of tolerating high concentrations of As, potential having adapted to higher As levels derived from the tailings source.
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Guan, Xiangyu, Xu Yan, Youxun Li, Bo Jiang, Ximing Luo, and Xiaoyuan Chi. "Diversity and arsenic-tolerance potential of bacterial communities from soil and sediments along a gold tailing contamination gradient." Canadian Journal of Microbiology 63, no. 9 (2017): 788–805. http://dx.doi.org/10.1139/cjm-2017-0214.
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Gold tailings often release arsenic (As) contaminants into the surrounding environment. Microorganisms play an important role in the As cycle, whereas the effects of As on bacterial communities remain unclear. To reveal the effects of As on the diversity of bacterial communities and their As-tolerance potential, farmland soil and river sediment samples were collected at various distances from tailings in the Dandong area of northeastern China. The bacterial communities were analyzed using high-throughput sequencing of 16S rRNA genes. The membrane transport proteins ArsB and (or) ACR3 pump As(III) out of the cell to resist As toxicity. We studied the abundance and phylogeny of ArsB and ACR3 using PCR-based clone libraries and quantitative PCR. The bacterial community was divided into 10 phyla and 59 genera. The transformation from As(V) to As(III) was predominant, which was coupled with denitrification. Both ArsB and ACR3 likely evolved from different orders of Proteobacteria. The arsB gene seems to be more stable in bestowing bacteria with the capability to respond to the As concentration. Moreover, As with iron, manganese, and total organic carbon also influenced the clustering relationships of samples and bacterial distribution.
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Lee, Sung Eun, Jin Soo Lee, and Hyo Taek Chon. "Environmental Contamination of Heavy Metals and Effects of Sediment Bacteria on Cadmium Speciation in the Vicinity of the Hwacheon Mine." Key Engineering Materials 277-279 (January 2005): 438–44. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.438.
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In order to investigate the extent and degree of heavy metal contamination in soils and sediments influenced by past mining activities, and to estimate the effects of indigenous bacteria on Cd speciation and bioremoval efficiency in sediments according to the various environmental conditions, tailings, soils, waters and sediments were collected from the Hwacheon Au-Ag-Pb-Zn mine in Korea. Elevated levels of metals, i.e., 29 As mg/kg, 30 Cd mg/kg, 261 Cu mg/kg, 601 Pb mg/kg and 3128 Zn mg/kg were found in sediments. High concentrations of As and other heavy metals in soils, waters and sediments were found near the tailings piles. From the results of sequential extraction analyses with tailings and soils, a high proportion of Cd is present as non-residual fractions. This indicates that Cd is more mobile and bioavailable than Cu, Pb and Zn. For seasonal variation, the concentrations of As and other heavy metals were much more elevated in soils collected before rainy season than after rainy season. To estimate the bioremoval efficiency for Cd, bacteria which can adsorb Cd were isolated from sediments in this area. Microorganisms in sediments can alter the mobility of heavy metals and bacteria can leach heavy metals from sediments, adsorb them on their cell wall and accumulate them within an intracellular matrix. From the metal sorption tests with indigenous bacteria, the bioremoval efficiency of Cd in Cd single solution (10 ppm) was more than 90%. As well, the isolated bacterial strains exhibited a preferential metal sorption , i.e., Cd > Pb > Zn for single metal solutions and Pb > Cd > Zn for the mixed metal solutions. Therefore, the use of some microorganisms to remove heavy metals from contaminated sediments may represent an innovative purification process.
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Lizárraga-Mendiola, Liliana, Diana Elizabeth Ángeles-Chávez, Alberto Blanco-Piñón, Màrius Ramírez-Cardona, Francisco Javier Olguín-Coca, and María del Refugio González-Sandoval. "Contamination Potential of an Urban Mine Tailings Deposit in Central Mexico—A Preliminary Estimation." International Journal of Geosciences 05, no. 03 (2014): 296–312. http://dx.doi.org/10.4236/ijg.2014.53030.
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