{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T01:35:48Z","timestamp":1778031348744,"version":"3.51.4"},"reference-count":68,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,7,25]],"date-time":"2024-07-25T00:00:00Z","timestamp":1721865600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Resources"],"abstract":"<jats:p>Tailings are a significant concern due to their potential release of toxic elements into the environment, posing risks to ecosystems and human health. Therefore, understanding their polluting potential is crucial for effective mitigation strategies. This study evaluates the contaminating potential of eight tailing dams in the upper basin of the Puyango River in southern Ecuador. A physicochemical and mineralogical characterization of the tailings was conducted. The contents of As, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se, V, and Zn were determined using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). The contamination index (IC) and the risk (RI) to the environment and population were evaluated. As a result, it was found that As, Cu, Pb, Se, and Zn exceeded the maximum permissible limits in all the samples according to Ecuadorian regulations. Six of the eight tailing dams presented very high pollution levels (21.28 &lt; IC &lt; 298.61), indicating a severe contamination risk. As, Sb, and Se were the most significant contributors to the index, with 29%, 31%, and 20% contribution to the overall IC, respectively. However, the risk assessment indicated a low risk (RI &lt; 5) to both the population and the natural environment, mainly due to the distance between the tailing dams and the potential receptors. While the present risk associated with the studied tailing dams is low, there exists potential for long-term escalation.<\/jats:p>","DOI":"10.3390\/resources13080105","type":"journal-article","created":{"date-parts":[[2024,7,25]],"date-time":"2024-07-25T11:43:44Z","timestamp":1721907824000},"page":"105","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Assessment of Environmental Pollution and Risks Associated with Tailing Dams in a Historical Gold Mining Area of Ecuador"],"prefix":"10.3390","volume":"13","author":[{"given":"Bryan","family":"Salgado-Almeida","sequence":"first","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ari\u00e1n","family":"Briones-Escalante","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Falquez-Torres","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6953-1334","authenticated-orcid":false,"given":"Karla","family":"Fili\u00e1n-Haz","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2611-5749","authenticated-orcid":false,"given":"Fredy","family":"Guzm\u00e1n-Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Mexican Geological Survey (SGM), Boulevard Felipe Angeles Km. 93.50-4, Pachuca 42083, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1278-7640","authenticated-orcid":false,"given":"Kenny","family":"Escobar-Segovia","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth","family":"Pe\u00f1a-Carpio","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3538-6754","authenticated-orcid":false,"given":"Samantha","family":"Jim\u00e9nez-Oyola","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences FICT, ESPOL Polytechnic University ESPOL, Km 30.5 V\u00eda Perimetral, Guayaquil 090101, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Nungesser, S.L., and Pauliuk, S. (2022). Modelling Hazard for Tailings Dam Failures at Copper Mines in Global Supply Chains. Resources, 11.","DOI":"10.3390\/resources11100095"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Perdeli Demirkan, C., Smith, N.M., and Duzgun, S. (2022). A Quantitative Sustainability Assessment for Mine Closure and Repurposing Alternatives in Colorado, USA. Resources, 11.","DOI":"10.3390\/resources11070066"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"7199","DOI":"10.1007\/s10653-023-01623-7","article-title":"Assessment of Heavy Metal Pollution and Preschool Children Health Risk in Urban Street Dusts from Different Functional Areas in a Typical Industrial and Mining City, NW China","volume":"45","author":"Zhang","year":"2023","journal-title":"Environ. Geochem. Health"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"139700","DOI":"10.1016\/j.chemosphere.2023.139700","article-title":"A Systematic Review on Metal Contamination Due to Mining Activities in the Amazon Basin and Associated Environmental Hazards","volume":"339","author":"Moulatlet","year":"2023","journal-title":"Chemosphere"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Elwaleed, A., Jeong, H.H., Abdelbagi, A.H., Quynh, N.T., Agusa, T., Ishibashi, Y., and Arizono, K. (2024). Human Health Risk Assessment from Mercury-Contaminated Soil and Water in Abu Hamad Mining Market, Sudan. Toxics, 12.","DOI":"10.3390\/toxics12020112"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"107332","DOI":"10.1016\/j.gexplo.2023.107332","article-title":"Heavy Metal(Loid)s Contamination and Ecotoxicological Hazards in Coal, Dust, and Soil Adjacent to Coal Mining Operations, Northwest Pakistan","volume":"256","author":"Din","year":"2024","journal-title":"J. Geochem. Explor."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Innis, S., Ghahramani, N., Rana, N., McDougall, S., Evans, S.G., Take, W.A., and Kunz, N.C. (2022). The Development and Demonstration of a Semi-Automated Regional Hazard Mapping Tool for Tailings Storage Facility Failures. Resources, 11.","DOI":"10.3390\/resources11100082"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"122","DOI":"10.1007\/s11270-024-06893-0","article-title":"Determination of Bioavailability, Potential Ecological and Human Health Risks, and Biomonitoring of Potential Toxic Elements in Gold Mine Tailings from Four Areas of Antioquia, Colombia","volume":"235","author":"Salazar","year":"2024","journal-title":"Water Air Soil Pollut."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"111139","DOI":"10.1016\/j.jenvman.2020.111139","article-title":"A New Ranking Scale for Assessing Leaching Potential Pollution from Abandoned Mining Wastes Based on the Mexican Official Leaching Test","volume":"273","author":"Arranz","year":"2020","journal-title":"J. Environ. Manag."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Bartoszek, L., Gruca-Rokosz, R., P\u0119kala, A., and Czarnota, J. (2022). Heavy Metal Accumulation in Sediments of Small Retention Reservoirs\u2014Ecological Risk and the Impact of Humic Substances Distribution. Resources, 11.","DOI":"10.3390\/resources11120113"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1007\/s10653-023-01841-z","article-title":"Mercury Pollution Risks of Agricultural Soils and Crops in Mercury Mining Areas in Guizhou Province, China: Effects of Large Mercury Slag Piles","volume":"46","author":"Zhang","year":"2024","journal-title":"Environ. Geochem. Health"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"133880","DOI":"10.1016\/j.jhazmat.2024.133880","article-title":"Comprehensive Insight into Mercury Contamination in Atmospheric, Terrestrial and Aquatic Ecosystems Surrounding a Typical Antimony-Coal Mining District","volume":"469","author":"Mao","year":"2024","journal-title":"J. Hazard. Mater."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1016\/j.psep.2024.01.091","article-title":"Source Apportionment and Health Risk Assessment in Chromite Mining Area: Insights from Entropy Water Quality Indexing and Monte Carlo Simulation","volume":"184","author":"Kumari","year":"2024","journal-title":"Process Saf. Environ. Prot."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"7183","DOI":"10.1007\/s10653-023-01597-6","article-title":"Assessment of Hg Pollution in Stream Waters and Human Health Risk in Areas Impacted by Mining Activities in the Ecuadorian Amazon","volume":"45","author":"Montoya","year":"2023","journal-title":"Environ. Geochem. Health"},{"key":"ref_15","first-page":"28","article-title":"Small-Scale Mining in Ecuador","volume":"75","author":"Sandoval","year":"2001","journal-title":"Min. Miner. Sustain. Dev."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/S0048-9697(01)00655-6","article-title":"Environmental Impacts and Metal Exposure of Aquatic Ecosystems in Rivers Contaminated by Small Scale Gold Mining: The Puyango River Basin, Southern Ecuador","volume":"278","author":"Flachier","year":"2001","journal-title":"Sci. Total Environ."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1542","DOI":"10.4236\/jep.2012.311170","article-title":"Mining and Seasonal Variation of the Metals Concentration in the Puyango River Basin\u2014Ecuador","volume":"3","author":"Garcia","year":"2012","journal-title":"J. Environ. Prot."},{"key":"ref_18","first-page":"437","article-title":"Contamination by Heavy Metals in the South of Ecuador Associated to the Mining Activity","volume":"2","year":"2017","journal-title":"Bionatura"},{"key":"ref_19","unstructured":"MAE-PRAS (2023, March 14). Programa de Reparaci\u00f3n Ambiental y Social\u2014Plan de Reparaci\u00f3n Integral de La Cuenca Del R\u00edo Puyango; Quito, Ecuador. Available online: http:\/\/pras.ambiente.gob.ec\/documents\/228536\/737569\/LIBRO_PRI_PUYANGO.pdf\/94bcfdb4-bf26-4d3a-afa3-d5e87cf7398b."},{"key":"ref_20","unstructured":"Torres, W. (2023, March 22). Protesta en Per\u00fa por Contaminaci\u00f3n de r\u00edo por Miner\u00eda en Ecuador. Available online: https:\/\/www.primicias.ec\/noticias\/economia\/protesta-peru-contaminacion-rio-mineria-ecuador\/."},{"key":"ref_21","unstructured":"Nu\u00f1ez, S., and Zegarra, J. (2006). Estudio Geoambiental de La Cuenca Puyango\u2014Tumbes, Instituto Geol\u00f3gico, Minero y Metal\u00fargico\u2014INGEMMET."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"385","DOI":"10.20937\/RICA.2016.32.04.02","article-title":"Niveles de Metales Pesados En Sedimentos de La Cuenca Del R\u00edo Puyango, Ecuador","volume":"32","author":"Mora","year":"2016","journal-title":"Rev. Int. Contam. Ambient."},{"key":"ref_23","first-page":"63","article-title":"Sistema de Tratamiento Para Mejorar La Calidad de Aguas de Drenaje de Pasivos Ambientales Mineros En La Cuenca Del R\u00edo Puyango (Ecuador)","volume":"64","author":"Delgado","year":"2018","journal-title":"Soc. Geol\u00f3gica Espa\u00f1a"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"237","DOI":"10.15446\/dyna.v83n195.51745","article-title":"Environmental Study of Gold Mining Tailings in the Ponce Enriquez Mining Area (Ecuador)","volume":"83","year":"2016","journal-title":"DYNA"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Salgado-Almeida, B., Falquez-Torres, D.A., Romero-Crespo, P.L., Valverde-Armas, P.E., Guzm\u00e1n-Mart\u00ednez, F., and Jim\u00e9nez-Oyola, S. (2022). Risk Assessment of Mining Environmental Liabilities for Their Categorization and Prioritization in Gold-Mining Areas of Ecuador. Sustainability, 14.","DOI":"10.3390\/su14106089"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1007\/s10393-005-8462-4","article-title":"Small-Scale Gold Mining in the Puyango River Basin, Southern Ecuador: A Study of Environmental Impacts AndHuman Exposures","volume":"2","author":"Betancourt","year":"2005","journal-title":"Ecohealth"},{"key":"ref_27","unstructured":"INHAMI (2022, February 02). Instituto Nacional de Meteorolog\u00eda e Hidrolog\u00eda|Ecuador. Available online: https:\/\/inamhi.wixsite.com\/inamhi\/novedades."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"437","DOI":"10.21931\/RB\/2017.02.04.5","article-title":"Contaminaci\u00f3n por metales pesados en el sur del Ecuador asociada a la actividad minera","volume":"2","year":"2017","journal-title":"Bionatura"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1415","DOI":"10.1007\/s11270-012-1415-y","article-title":"Particulate and Dissolved Trace Element Concentrations in Three Southern Ecuador Rivers Impacted by Artisanal Gold Mining","volume":"224","author":"Carling","year":"2013","journal-title":"Water. Air. Soil Pollut."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Smith, K.S., Ramsey, C.A., and Hageman, P.L. (2000). Sampling Strategy for the Rapid Screening of Mine-Waste Dumps on Abandoned Mine Lands. Fifth. International Conference on Acid Rock Drainage, USGS.","DOI":"10.3133\/ofr0016"},{"key":"ref_31","unstructured":"(2017). Standard Test Methods for Determining the Amount of Material Finer than 75-\u03bcm (No. 200) Sieve in Soils by Washing (Standard No. ASTM D1140-17). Available online: https:\/\/www.astm.org\/d1140-17.html."},{"key":"ref_32","unstructured":"(2002). Standard Test Method for Particle-Size Analysis of Soils (Standard No. ASTM D422-63(2007)). Available online: https:\/\/www3.epa.gov\/hudson\/pdf\/sedc_2004-2005_append.pdf."},{"key":"ref_33","unstructured":"Carter, L., Toth, M.I., and Day, W.C. (1994). Inductively Coupled Plasma\u2013Mass Spectrometry: A Powerful Tool for Mineral Resource and Environmental Studies, USGS Research on Mineral Resources."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Kurita, T. (2020). Principal Component Analysis (PCA) BT\u2014Computer Vision: A Reference Guide, Springer International Publishing.","DOI":"10.1007\/978-3-030-03243-2_649-1"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"792","DOI":"10.1007\/s10661-022-10433-w","article-title":"Polluting Potential from Mining Wastes: Proposal for Application a Global Contamination Index","volume":"194","year":"2022","journal-title":"Environ. Monit. Assess."},{"key":"ref_36","unstructured":"del Campo, A., Arranz-Gonz\u00e1lez, J., Rodr\u00edguez-G\u00f3mez, V., Vadillo, L., Rodr\u00edguez, V., and Fern\u00e1ndez, F. (2014). Manual Para La Evaluaci\u00f3n de Riesgos de Instalaciones de Residuos de Industrias Extractivas Cerradas o Abandonadas, Ministerio de Agricultura, Alimentaci\u00f3n y Medio Ambiente Espa\u00f1a, Instituto Geol\u00f3gico y Minero de Espa\u00f1a. [1st ed.]."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Kabata-Pendias, A. (2010). Trace Elements in Soils and Plants: Fourth Edition, CRC Press. [4th ed.].","DOI":"10.1201\/b10158"},{"key":"ref_38","first-page":"14","article-title":"US Geological Survey Field Leach Test for Assessing Water Reactivity and Leaching Potential of Mine Wastes, Soils, and Other Geologic and Environmental Materials","volume":"5","author":"Hageman","year":"2007","journal-title":"Geol. Surv. Tech. Methods B"},{"key":"ref_39","unstructured":"Gasc\u00f3n, R.C., Soto, M.C., Oblasser, A., Calder\u00f3n-Rosas, C., Hoppe, J., Farf\u00e1n-Salazar, N., Lav\u00edn, C., Cruz, C.V., Jorquera, J.R., and Guala, J.C. (2015). Methodological Guide for the Chemical Stability of Mining Works and Facilities, SERNAGEOMIN."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Lemos, M., Valente, T., Marinho Reis, P., Fonseca, R., Delbem, I., Ventura, J., and Magalh\u00e3es, M. (2021). Mineralogical and Geochemical Characterization of Gold Mining Tailings and Their Potential to Generate Acid Mine Drainage (Minas Gerais, Brazil). Minerals, 11.","DOI":"10.3390\/min11010039"},{"key":"ref_41","unstructured":"Ram\u00edrez Morand\u00e9, N.A. (Gu\u00eda T\u00e9cnica de Operaci\u00f3n y Control de Dep\u00f3sitos de Relaves, 2007). Gu\u00eda T\u00e9cnica de Operaci\u00f3n y Control de Dep\u00f3sitos de Relaves."},{"key":"ref_42","unstructured":"TULSMA (Texto Unificado de Legislaci\u00f3n Secundaria Medio Ambiental. Ministerio de Ambiente de Ecuador, 2015). Texto Unificado de Legislaci\u00f3n Secundaria Medio Ambiental. Ministerio de Ambiente de Ecuador."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"19","DOI":"10.1023\/A:1011965430757","article-title":"Fluvial Contamination Associated with Artisanal Gold Mining in the Ponce Enr\u00edquez, Portovelo-Zaruma and Nambija Areas, Ecuador","volume":"131","author":"Appleton","year":"2001","journal-title":"Water. Air. Soil Pollut."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"632","DOI":"10.1039\/C7EM00504K","article-title":"Evidence of Transboundary Mercury and Other Pollutants in the Puyango-Tumbes River Basin, Ecuador\u2013Peru","volume":"20","author":"Marshall","year":"2018","journal-title":"Environ. Sci. Process. Impacts"},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Cogram, P. (2018). Jarosite. Reference Module in Earth Systems and Environmental Sciences, Elsevier.","DOI":"10.1016\/B978-0-12-409548-9.10960-1"},{"key":"ref_46","first-page":"248","article-title":"Mining Environmental Liabilities in Northwest Argentina: Mineralogical, Geochemical Aspects and Environmental Consequences","volume":"29","author":"Kirschbaum","year":"2012","journal-title":"Rev. Mex. Ciencias Geol\u00f3gicas"},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Verplanck, P.L. (2008). Chapter B: Understanding Jarosite\u2014From Mine Waste to Mars, Understanding Contaminants Associated with Mineral Deposits.","DOI":"10.3133\/cir1328"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"14054","DOI":"10.1007\/s11356-020-11473-w","article-title":"Assessment of the Pollution Potential of a Special Case of Abandoned Sulfide Tailings Impoundment in Riotinto Mining District (SW Spain)","volume":"28","year":"2021","journal-title":"Environ. Sci. Pollut. Res."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"407","DOI":"10.1016\/j.chemgeo.2004.06.053","article-title":"Secondary Sulfate Minerals Associated with Acid Drainage in the Eastern US: Recycling of Metals and Acidity in Surficial Environments","volume":"215","author":"Hammarstrom","year":"2005","journal-title":"Chem. Geol."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"621","DOI":"10.3390\/min4030621","article-title":"Evolution of Acid Mine Drainage Formation in Sulphidic Mine Tailings","volume":"4","author":"Dold","year":"2014","journal-title":"Minerals"},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Pi-Puig, T., Sol\u00e9, J., and Cruz, A.G. (2020). Mineralogical Study and Genetic Model of Efflorescent Salts and Crusts from Two Abandoned Tailings in the Taxco Mining District, Guerrero (Mexico). Minerals, 10.","DOI":"10.3390\/min10100871"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"2778","DOI":"10.2320\/matertrans.43.2778","article-title":"Distribution and Transition of Heavy Metals in Mine Tailing Dumps","volume":"43","author":"Sasaki","year":"2002","journal-title":"Mater. Trans."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"137163","DOI":"10.1016\/j.jclepro.2023.137163","article-title":"Critical Raw Materials Recovery Potential from Spanish Mine Wastes: A National-Scale Preliminary Assessment","volume":"407","year":"2023","journal-title":"J. Clean. Prod."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1007\/s10230-021-00754-6","article-title":"Geoenvironmental Study of Gold Mining Tailings in a Circular Economy Context: Santa Barbara, Minas Gerais, Brazil","volume":"40","author":"Lemos","year":"2021","journal-title":"Mine Water Environ."},{"key":"ref_55","unstructured":"Borja, T., and Moreno, J. (2023, March 20). Estudio Para La Optimizaci\u00f3n de Un Circuito Flotaci\u00f3n- Cianuraci\u00f3n de Concentrados Sulfurosos En La Planta de Beneficio La L\u00f3pez Para El Procesamiento Del Mineral de La Mina Jerusal\u00e9n En El Cant\u00f3n Camilo Ponce Enr\u00edquez, Escuela Superior Polit\u00e9cnica del Litoral. Available online: https:\/\/www.dspace.espol.edu.ec\/handle\/123456789\/32270?locale=es."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"900","DOI":"10.1016\/j.scitotenv.2018.05.211","article-title":"Continuous Impact of Mining Activities on Soil Heavy Metals Levels and Human Health","volume":"639","author":"Tepanosyan","year":"2018","journal-title":"Sci. Total Environ."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"4549","DOI":"10.1007\/s10653-023-01514-x","article-title":"Trace Elements in Farmland Soils and Crops, and Probabilistic Health Risk Assessment in Areas Influenced by Mining Activity in Ecuador","volume":"45","author":"Higueras","year":"2023","journal-title":"Environ. Geochem. Health"},{"key":"ref_58","doi-asserted-by":"crossref","unstructured":"Gonz\u00e1lez-Valoys, A.C., Esbr\u00ed, J.M., Campos, J.A., Arrocha, J., Garc\u00eda-Noguero, E.M., Monteza-Destro, T., Mart\u00ednez, E., Jim\u00e9nez-Ballesta, R., Guti\u00e9rrez, E., and Vargas-Lombardo, M. (2021). Ecological and Health Risk Assessments of an Abandoned Gold Mine (Remance, Panama): Complex Scenarios Need a Combination of Indices. Int. J. Environ. Res. Public Health, 18.","DOI":"10.3390\/ijerph18179369"},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Chen, R., Han, L., Liu, Z., Zhao, Y., Zhai, Y., Li, R., and Xia, L. (2022). Analysis of Soil As Pollution and Investigation of Dominant Plants in Abandon Gold Mining Area. Minerals, 12.","DOI":"10.3390\/min12111366"},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"116666","DOI":"10.1016\/j.envpol.2021.116666","article-title":"An Integrated Method for Source Apportionment of Heavy Metal(Loid)s in Agricultural Soils and Model Uncertainty Analysis","volume":"276","author":"Wang","year":"2021","journal-title":"Environ. Pollut."},{"key":"ref_61","doi-asserted-by":"crossref","unstructured":"Wu, J., Jia, R., Xuan, H., Zhang, D., Zhang, G., and Xiao, Y. (2022). Priority Soil Pollution Management of Contaminated Site Based on Human Health Risk Assessment: A Case Study in Southwest China. Sustainability, 14.","DOI":"10.3390\/su14063663"},{"key":"ref_62","doi-asserted-by":"crossref","unstructured":"Zeng, Q., Shen, L., Feng, T., and Hao, R. (2022). Investigation of the Distribution of Heavy Metals in the Soil of the Dahuangshan Mining Area of the Southern Junggar Coalfield, Xinjiang, China. Minerals, 12.","DOI":"10.3390\/min12101332"},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"100006","DOI":"10.1016\/j.envadv.2020.100006","article-title":"Assessment of Metals Pollution in Sediments and Tailings of Klein Aub and Oamites Mine Sites, Namibia","volume":"2","author":"Uugwanga","year":"2020","journal-title":"Environ. Adv."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"229","DOI":"10.17221\/107\/2016-SWR","article-title":"Assessment of Soil Heavy Metal Pollution in a Former Mining Area\u2014Before and after the End of Mining Activities","volume":"12","year":"2017","journal-title":"Soil Water Res."},{"key":"ref_65","doi-asserted-by":"crossref","unstructured":"Mestanza-Ram\u00f3n, C., Ordo\u00f1ez-Alcivar, R., Arguello-Guadalupe, C., Carrera-Silva, K., D\u2019orio, G., and Straface, S. (2022). History, Socioeconomic Problems and Environmental Impacts of Gold Mining in the Andean Region of Ecuador. Int. J. Environ. Res. Public Health, 19.","DOI":"10.3390\/ijerph19031190"},{"key":"ref_66","doi-asserted-by":"crossref","unstructured":"Mestanza-ram, C., Paz-mena, S., Carlos, L., Jimenez-gutierrez, M., Herrera-morales, G., Orio, G.D., and Straface, S. (2021). History, Current Situation and Challenges of Gold Mining in Ecuador\u2019s Litoral Region. Land, 10.","DOI":"10.3390\/land10111220"},{"key":"ref_67","unstructured":"Arranz-Gonz\u00e1lez, J., Rodr\u00edguez-G\u00f3mez, V., Rodr\u00edguez-Pacheco, R., Fern\u00e1ndez-Naranjo, F.J., Vadillo-Fern\u00e1ndez, L., and Alberruche del Campo, E. (2019). Gu\u00eda Para La Rehabilitaci\u00f3n de Instalaciones Abandonadas de Residuos Mineros, Ministerio para la Transici\u00f3n Ecol\u00f3gica."},{"key":"ref_68","unstructured":"Butler, L., Mitchell, P., and Levin, E. (2014). International Review of Environmental Rehabilitation Approaches for Artisanal and Small-Scale Mining. A Review of Best Practices for Frugal Rehabilitation of ASM in Mongolia, The Asia Foundation."}],"container-title":["Resources"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2079-9276\/13\/8\/105\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T15:23:13Z","timestamp":1760109793000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2079-9276\/13\/8\/105"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,7,25]]},"references-count":68,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2024,8]]}},"alternative-id":["resources13080105"],"URL":"https:\/\/doi.org\/10.3390\/resources13080105","relation":{},"ISSN":["2079-9276"],"issn-type":[{"value":"2079-9276","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,7,25]]}}}