Nanoparticles of TiO2 doped with low amount of Fe were synthesized from natural ilmenite obtained from alluvial gold mine wastes. The obtained TiO2 were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR), UV-Vis diffuse reflectance, thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), N2 adsorption-desorption isotherms, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results confirm the formation of mesoporous TiO2 nanoparticles in anatase phase with 0.05 wt.% of iron possibly replacing some titanium places. All the characterizations were performed to the synthesized solid and the reference materials (TiO2 anatase and Degussa P25). The photocatalytic activity of both the synthesized solid and references were evaluated in the photo-oxidation of cyanide in aqueous medium under UV illumination. An experimental design type Box-Behnken was performed choosing three different parameters: the initial concentration of cyanide (50, 150 and 250 ppm) the catalyst load (0.1, 0.5 and 1.0 g L-1) and the oxygen source. The percentage of cyanide conversion was chosen as response in the design obtaining as optimal conditions [CN-]0 = 50 ppm, catalyst load = 0.6 g L-1 and air bubbling. Under these conditions it was reached 32, 32 and 89% of cyanide conversion for Fe-TiO2 synthesized, TiO2 anatase and Degussa P25, respectively. TiO wastes Xray X ray XRD, XRD , (XRD) XRF, XRF (XRF) Fouriertransform Fourier transform FTIR, FTIR (FTIR) UVVis Vis reflectance analysisdifferential analysis differential TGA/DSC, TGADSC TGA/DSC TGA DSC (TGA/DSC) N adsorptiondesorption adsorption desorption isotherms TEM (TEM XPS. XPS . (XPS) 005 0 05 0.0 wt wt. places (TiO P25. P25 P P25) photooxidation photo oxidation illumination BoxBehnken Box Behnken parameters 50, (50 15 25 ppm 0.1, 01 1 (0.1 5 0. 10 1. L1 L source CN0 CN [CN-] 06 6 L- bubbling 3 89 FeTiO2 FeTiO Fe-TiO respectively (XRD (XRF (FTIR (TGA/DSC (XPS 00 P2 (5 2 0.1 (0. [CN- 8 ( (0 [CN

Abstract Introduction: Mining is one of the main drivers of deforestation of tropical forests. This activity affects the storage of aboveground biomass of these ecosystems; therefore, their ability to contribute to the mitigation of global climate change. Objective: To assess the influence of soil properties on the aboveground biomass storage of post-mining forests in the Colombian Pacific. Methods: Plots were established in areas post-mining and with different successional ages (12-15 years, 30-35 years, and mature forest). The aboveground biomass and physicochemical parameters of the soil were measured. Results: An aboveground biomass of 15.58 t ha-1, 35.17 t ha-1, and 178.32 t ha-1 was recorded at 12-15 years, 30-35 years, and mature forests, respectively. The species with the highest biomass content in post-mining forests were Cespedesia spathulata and Clidemia septuplinervia. The aboveground biomass was positively correlated with organic matter (OM), calcium (Ca), magnesium (Mg), CICE, total nitrogen (N), and silt. In contrast, the relationship was negative with sand, aluminum (Al), and potassium (K) content. It was evidenced that the relationship between aboveground biomass and soils differed in each successional age. When evaluating the changes of aboveground biomass and soils in the succession, it was observed that the aboveground biomass and total N increased with the recovery time. At the same time, the P and K decreased with succession. On the other hand, the contents of OM, Mg, Al, Ca, and CICE showed curvilinear tendencies since they increased in the first stages and then decreased in the advanced successional stages. Conclusions: Aboveground biomass increases with forest recovery time in the study area. This increase is influenced by the presence of two dominant species shared among the investigated ecosystems and by the soil’s N, P, and K content.

Resumen Introducción: La minería es una de las principales causas de deforestación de los bosques tropicales. Esta actividad afecta el almacenamiento de biomasa aérea de estos ecosistemas; y, por tanto, su capacidad para contribuir a la mitigación del cambio climático global. Objetivo: Evaluar la influencia de las propiedades del suelo en el almacenamiento de la biomasa aérea de bosques post-minería del Pacífico colombiano. Métodos: Se establecieron parcelas en áreas post-minería con diferentes edades de sucesión (12-15 años, 30-35 años y bosque maduro). Se midió la biomasa aérea y parámetros fisicoquímicos del suelo. Resultados: Se registró una biomasa aérea de 15.58 t ha-1, 35.17 t ha-1 y 178.32 t ha-1 en 12-15 años, 30-35 años y bosque maduro, respectivamente. Las especies con mayor contenido de biomasa en los bosques post-minería fueron Cespedesia spathulata y Clidemia septuplinervia. La biomasa aérea se correlacionó positivamente con la materia orgánica (MO), calcio (Ca), magnesio (Mg), CICE, nitrógeno total (N) y limo. Por el contrario, la relación fue negativa con el contenido de arena, aluminio (Al) y potasio (K). Se evidenció que la relación entre la biomasa aérea y los suelos difería en cada edad sucesional. Al evaluar los cambios de la biomasa aérea y los suelos en la sucesión, se observó que la biomasa aérea y el N total aumentaron con el tiempo de recuperación. Al mismo tiempo, el P y el K disminuyeron con la sucesión. Por otro lado, los contenidos de OM, Mg, Al, Ca, y CICE mostraron tendencias curvilíneas ya que aumentaron en los primeros estadios y luego disminuyeron en los estadios sucesionales avanzados. Conclusiones: la biomasa aérea aumenta con el tiempo de recuperación del bosque en el área de estudio. Este incremento está influenciado por la presencia de dos especies dominantes compartidas entre los ecosistemas investigados y por el contenido de N, P y K del suelo.

Reprocessing of historic gold tailings is a common activity in South Africa, while base metal tailings offer similar reprocessing potential. The historic base metal tailings of the Namib Pb-Zn mine (Erongo Region, Namibia) still contain valuable resources of Pb and Zn in carbonate-rich matter. Micro-analysis of primary ore minerals identifies some galena as argentiferous and sphalerite as the principal host of Cd. This study demonstrates that knowledge of primary ore mineralogy helps to reveal the hosts of valuable commodities (Ag, Cd) and that field-portable X-ray fluorescence tools allow precise and accurate determinations of major and minor elements like Zn and Cd in such carbonate-rich material. Although there are limitations to directly determine the contents of certain element (i.e., As, Sb, In), linear correlations allow prediction of the likely abundance of these elements. Providing that the inter-mineral and inter-element relations are understood and there is consistency in sampling and analytical methodology, portable X-ray fluorescence analysis is an effective method to evaluate the chemical characteristics of base metal tailings for a range of major and trace elements.

Abstract The COVID-19 pandemic caused the stoppage of the movement of people globally, a situation that especially affected tourism as an economic activity. This article addresses the impact of the closure of the Peruvian-Chilean border during the COVID-19 pandemic on the hotel and gastronomic sector of Tacna. Through a qualitative methodology that included a bibliographic review, economic data analysis, and semi-structured interviews with hotel and restaurant owners and managers, we investigated the problems they had to face during the pandemic and the strategies to overcome them. The findings indicate that until March 2020 both items experienced strong growth within the framework of cross-border practices from Chileans to Tacna, within which enjoying Peruvian food was one of the main attractions. The pandemic forced small hotels and restaurants to deploy strategies such as layoffs and the provision of family labor to overcome the crisis and convert to delivery food. The largest and most formalized companies accessed subsidies and support from the state and in other cases, the reconversion was hand in hand with agreements with mining companies to house workers while the health emergency lasted.

Resumen La pandemia de COVID-19 produjo la detención de los desplazamientos de personas a nivel global, situación que afectó especialmente al turismo como actividad económica. Este artículo aborda el impacto que produjo el cierre de la frontera peruano-chilena durante la pandemia de COVID-19, en el rubro hotelero y gastronómico de Tacna. A través de una metodología cualitativa que incluyó revisión bibliográfica, análisis de datos económicos y entrevistas semiestructuradas a dueños y administradores de hoteles y restaurantes, indagamos los problemas que debieron afrontar durante la pandemia y las estrategias para superarlos. Los hallazgos indican que hasta marzo del 2020, ambos rubros experimentaron un fuerte crecimiento en el marco de prácticas transfronterizas de chilenos a Tacna, dentro de los cuales, disfrutar de la comida peruana era uno de los principales atractivos. La pandemia obligó a los hoteles y restaurantes pequeños a desplegar estrategias como el despido y la provisión de mano de obra familiar para superar la crisis y reconvertirse a la comida por entregas o delivery. Las empresas más grandes y con mayor formalización accedieron a subsidios y apoyos del Estado y en otros casos, la reconversión fue de la mano de convenios con empresas mineras para alojar a trabajadores mientras duró la emergencia sanitaria.

Abstract In Ecuador, Artisanal and Small-Scale Mining, MAPE, is an activity of national relevance. Historically there are three provinces with great potential and mining tradition, which are: El Oro, Zamora Chinchipe and Azuay. In this sense, in the province of El Oro, a large percentage of the economically active population depends directly or indirectly on the exploitation of highly profitable minerals. The key aspects for the development of underground operations of the MAPE regime are the drilling and blasting activities, where there is a great opportunity for improvement, efficiently managing the design of the grid, the execution of the drilling, the amount of explosive and the way it is charged, which are the factors that define the result of the blasting; same that is valued in function of the depth of cut or advance and of the uniformity of the structure of the section. For the development of this research, the baseline survey was carried out through technical visits to the study sector (Zaruma - Portovelo mining district), where traditional work procedures were observed, and then, based on the experimental method, technical variations were made in regarding the firing diagram, specific charge, specific perforation and type of explosive. These traditional (empirical) procedures, based on the driller's field experience, cause, among other things, the inefficiency of the advance, problems to maintain the dimensions of the section, over breaking of the working fronts, and one of the most relevant factors, the insecurity of the personnel who in many cases remain inside the mine for more than 10 hours.The main results show that the best tests were those that used the emulsion/ANFO (Amonium Nitrate Fuel Oil) combination, obtaining an advance percentage of approximately 95%, considered optimal within the operation. It was also evidenced that the Ammonium Nitrate commonly used in ASM needs a specific charge of greater power to meet the objective of the blasting.

Resumen En Ecuador, la Minería Artesanal y de Pequeña Escala, MAPE, es una actividad de relevancia nacional. Históricamente existen tres provincias de amplio potencial y de tradición minera, que son: El Oro, Zamora Chinchipe y Azuay. En este sentido, en la provincia de El Oro, gran porcentaje de la población económicamente activa, depende directa o indirectamente de la explotación de minerales de alta rentabilidad. Uno de los aspectos clave para el desarrollo de las operaciones subterráneas del régimen MAPE, son las actividades de perforación y voladura, en donde existe una gran oportunidad de mejora, gestionando de manera eficiente el diseño de la malla, la ejecución de la perforación, la cantidad de explosivo y la forma de cargado, que son los factores que definen el resultado de la voladura; mismo que es valorado en función de la profundidad de corte o avance y de la uniformidad de la estructura de la sección. Para el desarrollo de esta investigación se realizó el levantamiento de la línea base mediante visitas técnicas al sector de estudio (distrito minero Zaruma - Portovelo), donde se observaron los procedimientos tradicionales de trabajo, para luego, con base al método experimental realizar variaciones técnicas en cuanto al diagrama de disparo, carga específica, perforación específica y tipo de explosivo. Estos procedimientos tradicionales (empíricos), basados en la experiencia de campo del perforista, ocasiona entre otras cosas la ineficiencia del avance, problemas para mantener las dimensiones de la sección, sobre rotura de los frentes de trabajo, y uno de los factores más relevantes, la inseguridad del personal que en muchos casos permanece en el interior de la mina por más de 10 horas. Entre los principales resultados se obtuvo que los mejores ensayos fueron los que se utilizó la combinación emulsión/ANFO (Amonium Nitrate Fuel Oil), obteniendo un porcentaje de avance de aproximadamente 95%, considerado dentro de la operación como óptimo. Así también se evidenció que el Nitrato de Amonio de uso habitual en la MAPE, necesita una carga específica de mayor poder para cumplir con el objetivo de la voladura.

ABSTRACT The objective of this work is to compare the quality of life of precarious quarry and brick-kiln workers in the municipality of San Luis Potosí and artisanal mercury mining in Camargo, Querétaro. Field work and non-participatory observation were carried out. During the field research period in 2019-2020, a questionnaire was applied to a total of 118 workers. The data were organized and processed with the Excel program (Microsoft Office 365) and analyzed within the framework of environmental anthropology and everyday-life approaches. In both contexts, it was found that the workers present a high level of marginalization, chronic diseases, physical inactivity, alcohol and tobacco consumption, in addition to the lack of protective equipment. According to the activity performed, they suffer from different occupational hazards. Furthermore, they are not employed under a labor contract, and their families also participate in the work. The identified situations of occupational precariousness presented various diagnosed chronic degenerative comorbidities, lack of protective equipment to perform their activities, occupational hazards and little access to health services. Therefore, multidisciplinary efforts and approaches are required to assess, address and draw attention to their conditions, in order to prevent, intervene and transform labor precariousness into decent work. Rev Arg Antrop Biol 26 (1), 2024. https://doi.org/10.24215/18536387e072

RESUMEN Este objetivo de este trabajo es comparar la calidad de vida de los trabajos precarios de cantera y ladrillo del municipio de San Luis Potosí y minería artesanal de mercurio en Camargo, Querétaro. Se realizó trabajo de campo y observación no participativa. Durante el periodo de investigación de campo en 2019-2020 se aplicó un cuestionario a un total de 118 trabajadores. Los datos fueron organizados y tratados con el programa Excel (versión Microsoft Office 365) y analizados dentro del marco de los enfoques de la antropología ambiental y de la vida cotidiana. En ambos contextos, se encontró que los trabajadores presentan un nivel alto de marginación, enfermedades crónicas, inactividad física, consumo de alcohol y tabaco, además de que no cuentan con equipo de protección, de acuerdo con la ocupación, tienen diferentes riesgos laborales. Además, no cuentan con contrato laboral. Aunado a ello, la familia participa en las labores. Los escenarios de precariedad laboral identificados presentaron algunas comorbilidades crónico-degenerativas diagnosticadas, nulo equipo de protección para realizar sus actividades, riesgos laborales y poco acceso a servicios de salud. Por lo tanto, requieren de esfuerzos y abordajes multidisciplinarios que permitan evaluar, atender y visibilizar sus condiciones con la finalidad de prevenir, intervenir y transformar la precariedad laboral en trabajo decente. Rev Arg Antrop Biol 26 (1), 2024. https://doi.org/10.24215/18536387e072

Abstract: The study was conducted at the Jalpan de Serra dam, Querétaro, Mexico. In a mountain watershed with a history of artisanal mining activity in the upper part, runoff feeds the reservoir, transporting mining tailings. The Jalpan dam has been used for drinking water supply, agricultural irrigation activities and recreational purposes as a Ramsar site. The reason for the study has been the relevance and social impact of the reservoir sediments as a source of diffuse pollution. The objective was to determine the concentration of arsenic, cadmium and lead in the sediment and to evaluate the level of risk to human health and the environment. The methodology consists of the analysis by atomic absorption carried out in three sites sampled in the superficial layer of 10 cm depth, samples obtained with a PVC tube of 7 cm diameter, identified, preserved for transfer and digested with nitric acid. The results show mean arsenic concentrations of 4.278 mg/kg, cadmium 0.323 mg/kg and lead 4.873 mg/kg. In conclusion, the sediment analyzed does not represent a risk to human health or the environment of the reservoir according to NOM-147-SEMARNAT/SSA1-2004. This investigation demonstrates the lack of a policy or standard that establishes permissible limits for heavy metals in sediment.

Resumen: El estudio ha sido realizado en la presa Jalpan de Serra, Querétaro, México. En una cuenca de montaña con antecedentes de actividad minera artesanal en la parte alta, la escorrentía alimenta el embalse, transportando relaves mineros. La presa Jalpan se ha empleado para abastecimiento de agua de consumo humano, actividades de riego agrícola y fines recreativos como sitio Ramsar. El motivo de estudio ha sido la relevancia e impacto social que tienen los sedimentos del embalse como fuente de contaminación difusa. El objetivo ha sido conocer la concentración de arsénico, cadmio y plomo en el sedimento y evaluar el nivel de riesgo para la salud humana y del ambiente. La metodología consiste en el análisis por absorción atómica realizada en tres sitios muestreados en la capa superficial de 10 cm de profundidad, muestras obtenidas con un tubo de PVC de 7 cm de diámetro, identificadas, conservadas para su traslado y digeridas con ácido nítrico. Los resultados muestran concentraciones medias en arsénico de 4.278 mg/kg, cadmio 0.323 mg/kg y plomo 4.873 mg/kg. En conclusión, el sedimento analizado no representa riesgo para la salud humana o entorno del embalse según la norma NOM-147-SEMARNAT/SSA1-2004. Esta investigación evidencia la falta de una política o norma que establezca los límites permisibles de metales pesados en sedimentos.

Resumen El objetivo del presente artículo consiste en reflexionar sobre la configuración del patrimonio como dispositivo por el cual se construyen las identidades como diferencia. Particularmente, exploro los modos en que el patrimonio “hace política” al ser movilizado en la producción oficial de fronteras nosotros/otros. Recuperando datos etnográficos provenientes de la investigación antropológica realizada en una localidad minera de la Patagonia sur argentina, analizo cómo un sitio arqueológico se construye desde políticas gubernamentales como patrimonio identitario local. Argumento que ello posibilita a las elites y agencias de gobierno locales generar un sentido particular de pertenencia que, a su vez, apuntala la construcción de “alteridades ausentes” en relación con los pueblos originarios y de “alteridades amenazantes” en relación con los migrantes que llegan para emplearse en la actividad megaminera.

Abstract The objective of this article is to reflect on the configuration of heritage as a device through which identities are constructed as differences. In particular, I explore the ways in which it “does politics” by being mobilized in the official production of us/other borders. Recovering ethnographic data from anthropological research carried out in a mining town in southern Argentine Patagonia, I analyze how an archaeological site is built from government policies as a local identity heritage. I argue that this makes it possible for local elites and government agencies to generate a particular sense of belonging that, in turn, underpins the construction of “absent” alterities in relation to the indigenous peoples, and “threatening” in relation to the migrants who arrive to be used in mining activity.

Resumo O objetivo deste artigo é refletir sobre a configuração do patrimônio como dispositivo pelo qual as identidades são construídas como diferença. Particularmente, exploro as formas pelas quais “faz política” ao ser mobilizado na produção oficial de nós/outras fronteiras. Recuperando dados etnográficos de pesquisas antropológicas realizadas em uma cidade mineira no sul da Patagônia, Argentina, analiso como um sítio arqueológico é construído a partir de políticas governamentais como patrimônio identitário local. Argumento que isto permite que as elites e as agências governamentais locais gerem um sentimento particular de pertencimento que, por sua vez, sustenta a construção de “alteridades ausentes” em relação aos povos nativos, e de “alteridades ameaçadoras” em relação aos migrantes que chegam para ser. empregados na atividade de megamineração.

Probability-based empirical methods were employed as an alternative approach to predicting uncertainties associated with rock mass properties. The focus was on developing probabilistic spreadsheets to forecast rock mass classification indexes. Histograms were constructed to describe the best distribution in predicting rock mass properties. The developed models also offer utility in predicting the impact of discontinuities within the rock mass on rock strength and rock mass classification systems. Statistical analyses identified volumetric joint count, joint spacing, joint frequency, and rock strength as the most influential parameters. Moreover, the statistical analysis revealed varying degrees of correlation among different rock mass properties. While some properties demonstrated significant correlations suitable for modelling, others did not align well with any correlation model. The results highlight the need for a comprehensive approach to rock mass characterization, considering multiple factors beyond volumetric joint count. Geological complexities, including tectonic activity and weathering processes, may obscure direct correlations. These results emphasize the importance of empirical modelling and detailed site investigations for accurate assessment of rock mass quality and stability in the Himalaya.

RESUMEN En la Amazonía ecuatoriana, cada día son mayores los desafíos para la identificación de especies fitorremediadoras que disminuyan la contaminación por metales pesados producto de la actividad minera. El objetivo de este trabajo fue evaluar el potencial bioacumulador de metales pesados de tres especies forestales de rápido crecimiento (Ochroma pyramidale, Piptocoma discolor y Bambusa vulgaris) en un área de extracción minera, en la comunidad Yutzupino, Napo para la restauración. Se recolectaron muestras de hoja y suelo para determinar la concentración de metales pesados (Cd, Pb, Fe y Ni), mediante espectrometría de absorción atómica y se calculó el factor de bioconcentración (FBC). Los análisis foliares mostraron que B. vulgaris presentó mayor concentración de Ni (6,89 mg kg-1) y Fe (156,33 mg kg-1) y P. discolor contenía Cd (0,35 mg kg-1) y Pb (55,67 mg kg -1). Los análisis de suelos mostraron un patrón de variación en B. vulgaris superior en Cd, Ni y Pb y en O. pyramidale para Fe. El factor de bioconcentración permitió identificar la capacidad acumuladora de las especies, lo que sugiere que P. discolor puede ser utilizada como especie fitorremediadora para sitios contaminadas por Cd y Pb, O. pyramidale para Ni y B. vulgaris para Fe.

RESUMO Na Amazônia equatoriana, os desafios para a identificação de espécies de fitorremediação para reduzir a contaminação por metais pesados provenientes de atividades de mineração aumentam a cada dia. O objetivo deste trabalho foi avaliar o potencial bioacumulativo de metais pesados de três espécies florestais de crescimento rápido (Ochroma pyramidale, Piptocoma discolor e Bambusa vulgaris) em uma área de extração de mineração na comunidade de Yutzupino, Napo, para restauração. Amostras de folhas e de solo foram coletadas para determinar a concentração de metais pesados (Cd, Pb, Fe e Ni) por espectrometria de absorção atômica e o fator de bioconcentração (BCF) foi calculado. A análise das folhas mostrou que a B. vulgaris tinha concentrações mais altas de Ni (6,89 mg kg-1) e Fe (156,33 mg kg-1) e a P. discolor continha Cd (0,35 mg kg-1) e Pb (55,67 mg kg -1). As análises do solo mostraram um padrão de variação em B. vulgaris maior em Cd, Ni e Pb e em O. pyramidale para Fe. O fator de bioconcentração identificou a capacidade de acumulação das espécies, sugerindo que P. discolor pode ser usada como uma espécie de fitorremediação para locais contaminados com Cd e Pb, O. pyramidale para Ni e B. vulgaris para Fe.

ABSTRACT In the Ecuadorian Amazon, the challenges for identifying, phytoremediation species that reduce heavy metal contamination resulting from mining activity are increasing every day. The objective of this work was to evaluate the bioaccumulator potential of heavy metals of three fast-growing forest species (Ochroma pyramidale, Piptocoma discolor and Bambusa vulgaris) in a mining extraction area, in the Yutzupino community, Napo for restoration. Leaf and soil samples were collected to determine the concentration of heavy metals (Cd, Pb, Fe and Ni) using atomic absorption spectrometry and the bioconcentration factor (BCF) was calculated. Leaf analyzes showed that B. vulgaris presented a higher concentration of Ni (6.89 mg kg-1 ) and Fe (156.33 mg kg-1 ) and P. discolor contained Cd (0.35 mg kg-1 ) and Pb (55.67 mg kg -1 ). Soil analyzes showed a pattern of variation in B. vulgaris superior in Cd, Ni and Pb and in O. pyramidale for Fe. The bioconcentration factor allowed identifying the accumulating capacity of the species, which suggests that P. discolor may be used as a phytoremediation species for sites contaminated by Cd and Pb, O. pyramidale for Ni and B. vulgaris for Fe.

Abstract Mining is the largest economic activity in Peru, contributing a considerable percentage of the country's Gross Domestic Product. However, the process of this activity evidences several socio-environmental conflicts. The generation of mining waste or expressed as mining tailings from the various processes is a latent threat that affects the spheres of sustainable development. The objective of this study was to propose the valorization of mining tailings as aggregates for road construction in the Andean region of Peru under a circular economy approach. Consequently, several analyses were carried out to evaluate its viability, such as the meteorological factor of precipitation, acidity or alkalinity, elements present in the sample, granulometry, California Bearing Ratio (CBR) and Marshall test. The results have shown that the proposal complies with the parameters established at the national level with a stability of 877.67 kg and a 25% utilization of mine tailings. In conclusion, the use of mine tailings as aggregates for construction is a viable proposal for road construction under a circular economy approach. Finally, the analysis of the valorization of mining waste in other elements of the construction sector is recommended to continue promoting the circular economy and sustainable development.

Resumen La minería en el Perú es la más grande actividad económica aportando un porcentaje considerable al Producto Bruto Interno nacional. Sin embargo, el proceso de esta actividad evidencia diversos conflictos socio-ambientales. La generación de residuos mineros o expresados como relaves mineros provenientes de los diversos procesos es una amenaza latente que afecta las esferas del desarrollo sostenible. Este estudio tuvo como objetivo la propuesta de valorización de relaves mineros como áridos para la construcción de carreteras en la región andina del Perú bajo un enfoque de economía circular. En consecuencia, se realizó diversos análisis para evaluar su viabilidad como el factor meteorológico de precipitación, acidez o alcalinidad, elementos presentes en la muestra, granulometría, California Bearing Ratio (CBR) y prueba Marshall. Los resultados han demostrado que la propuesta cumple con los parámetros establecidos a nivel nacional con una estabilidad de 877,67 kg y un aprovechamiento del 25% de los relaves mineros. En conclusión, el uso de relaves mineros como áridos para la construcción es una propuesta viable para la construcción de carreteras bajo un enfoque de economía circular. Finalmente, se recomienda el análisis de valorización de residuos mineros en otros elementos del sector construcción para continuar promoviendo la economía circular y desarrollo sostenible.

Resumo Los usuarios de internet en todo el mundo pasan un promedio de 2 horas y 25 minutos al día en las redes sociales, por lo que técnicas como el análisis del sentimiento son aplicadas a sus redes sociales, la cual es utilizada para la identificación y clasificación de las emociones empleadas en actividades como investigación de mercados, monitoreo de la reputación de marca, medición de la satisfacción del cliente, entre otros. Esta comunicación pretende determinar la importancia y utilidad del análisis de sentimiento a través de la minería de datos como una herramienta relevante para conocer tendencias de opinión y sentimiento de referentes comunicacionales. La metodología utilizada es de corte cualitativo bajo el método del estudio de caso. Se utilizó Twitter como fuente para la recopilación de información y para su análisis se empleó el software de minería de datos RapidMiner con el operador para análisis de sentimiento. Como parte de las conclusiones, se observa que es posible afirmar que el análisis del sentimiento a través de la minería de datos es una herramienta útil y valiosa para la toma de decisiones sobre las estrategias comunicacionales que pueden llevarse a cabo, no solo en el turismo sino en cualquier actividad que busque posicionarse en la mente del consumidor.

Abstract Internet users around the world spend an average of 2 hours and 25 minutes a day on social networks, so techniques such as sentiment analysis are applied to their social networks, which is used for the identification and classification of the emotions used in activities such as market research, brand reputation monitoring, customer satisfaction measurement, among others. This communication aims to determine the importance and usefulness of sentiment analysis through data mining as a relevant tool to know opinion trends and sentiment of communication referents.The methodology used is qualitative under the case study method. Twitter was used as a source for the collection of information and for its analysis the data mining software RapidMiner was used with the operator for sentiment analysis. As part of the conclusions, it is observed that it is possible to affirm that the analysis of sentiment through data mining is a useful and valuable tool for decision-making on communication strategies that can be carried out, not only in tourism, but in any activity that seeks to position itself in the mind of the consumer.

ABSTRACT Vermiculite mining residues, although of low solubility, contain nutrients such as calcium, magnesium, and potassium at concentrations that allow their agricultural use. Beneficial bacteria can increase the solubility of this waste and its efficiency. The objective of the present study was to evaluate the influence of bio-inoculation of vermiculite residue, associated with cattle manure, on the release of nutrients and initial growth of maize. A completely randomized design was performed in a greenhouse with seven treatments and four replications. The treatments were: T1 - soil without fertilization; T2 - soil fertilized with soluble sources of nutrients (conventional fertilization); T3 - application of vermiculite residue (VR); T4 - VR enriched with cattle manure (CM); T5 - VR + CM with Bacillus subtilis; T6 - VR + CM + B. amyloliquefaciens, and T7 - VR + CM +B. subtilis + B. amyloliquefaciens). Regardless of the use of cattle manure or beneficial microorganisms, vermiculite mining waste increased the availability of Ca and K in the soil, but was not able to match the soluble sources of nutrients. Mining waste associated with cattle manure and beneficial microorganisms (B. subtilis and B. amyloliquefaciens) increased microbial activity and enhanced the release of available calcium for maize. VR increased the growth and the dry mass production of maize compared to the non-fertilized soil, but was consistently inferior to conventional fertilizer. residues magnesium efficiency bioinoculation bio inoculation replications were T fertilization fertilization) (VR) (CM) B amyloliquefaciens +B amyloliquefaciens. . (B nonfertilized non fertilizer (VR (CM

RESUMO Os resíduos da mineração de vermiculita, embora de baixa solubilidade, contêm nutrientes como cálcio, magnésio e potássio em concentrações que permitem seu uso agrícola. Bactérias benéficas podem aumentar a solubilidade deste resíduo e sua eficiência. Objetivou-se avaliar a influência da bioinoculação do resíduo de vermiculita, associado ao esterco bovino, na liberação de nutrientes e no crescimento inicial do milho. Foi realizado delineamento inteiramente casualizado em casa de vegetação com sete tratamentos e quatro repetições. Os tratamentos foram: T1 - solo sem adubação; T2 - solo adubado com fontes solúveis de nutrientes (fertilização convencional); T3 - aplicação de resíduo de vermiculita (VR); T4 - VR enriquecido com esterco bovino (CM); T5 -VR+CM com Bacillus subtilis; T6 - VR + CM + B. amyloliquefaciens e T7 - VR + CM + B. subtilis + B. amyloliquefaciens). O VR aumentou a disponibilidade de Ca e K no solo, porém seu desempenho foi inferior às fontes solúveis. Independentemente da utilização de esterco bovino ou de microrganismos benéficos, os resíduos da mineração de vermiculita aumentaram a disponibilidade de Ca e K no solo, mas não foram capazes de igualar as fontes solúveis de nutrientes. Os resíduos de mineração associados ao esterco bovino e aos microrganismos benéficos (B. subtilis e B. amyloliquefaciens) aumentaram a atividade microbiana e aumentaram a liberação de cálcio disponível para o milho. Os resíduos da mineração de vermiculita aumentaram o crescimento e a produção de massa seca do milho em comparação ao solo não fertilizado, mas foram consistentemente inferiores ao fertilizante convencional. agrícola eficiência Objetivouse Objetivou se repetições T adubação fertilização convencional convencional) (VR) (CM) VR+CM VRCM B amyloliquefaciens. . (B fertilizado (VR (CM

RESUMEN En los primeros años del siglo XIX, la abertura de una carretera entra la parte central de la zona de Mata de Minas Gerais y la ciudad de Campos dos Goytacazes sirvió como catalizador del proceso de ocupación de las tierras que la atravesaban. Del mismo modo, se percibió el aumento del comercio entre estas dos áreas, llevándolos a la formación de un espacio económico particular, correspondiente en gran medida a la cuenca del río Pomba. Este artículo tiene por objetivo analizar la producción rural y la circulación de mercancías de esta región a lo largo de las primeras décadas del siglo XIX con base en los datos de los décimos de importación y exportación del registro de la Barra de Pombo, así como cuestionar la veracidad del concepto de espacio económico para el período posterior a la decadencia de la actividad minera. atravesaban modo áreas particular Pomba Pombo minera

ABSTRACT In the early years of the nineteenth century, the opening of a road between the central part of the so-called “Zona da Mata” (Forest Belt) of Minas Gerais and the city of Campos dos Goytacazes acted as a catalyst for a process of land occupation in the region. The process was accompanied by an increase in trade between the two areas, signaling the formation of a particular economic space. This article analyzes the rural production and the circulation of goods in the central area of the Zona da Mata during the first decades of the nineteenth century, based on records of tithes and on import and export data from the Barra do Pomba customs house. It also questions the validity of the concept of economic space for the period after the decline of mining activity. century socalled so called Forest Belt region areas house activity

RESUMO Nos primeiros anos do século XIX, a abertura de uma estrada entre a parte central da Zona da Mata de Minas Gerais e a cidade de Campos dos Goytacazes atuou como catalisador do processo de ocupação das terras por ela atravessadas. Do mesmo modo, assistiu-se ao incremento do comércio entre as duas áreas, sinalizando para a formação de um espaço econômico particular, em grande medida correspondente à bacia hidrográfica do rio Pomba. Este artigo tem por objetivo analisar a produção rural e a circulação de mercadorias nessa região ao longo das primeiras décadas do século XIX com base nos dados dos dízimos e de importação e exportação pelo registro da Barra do Pomba, bem como questionar a validade do conceito de espaço econômico para o período posterior ao declínio da atividade mineradora. atravessadas modo assistiuse assistiu se áreas particular Pomba mineradora

Over the years the study of the quantitative structure-activity relationship (QSAR) has transformed from a simple regression analysis to the implementation of machine learning (ML) with multiple statistics. Today ML-based QSAR models are quite important and play a notable role in drug design and screening, property prediction, biological activity, etc. ML methods applied to QSAR build classification or regression models to describe/predict the complex relationships between the chemical structure of molecules and biological activity. Even with the increase in scientific publications addressing this topic written in Portuguese, there is still a shortage of scientific articles explaining ML techniques applied to QSAR, how to build models, the types of models, algorithms, for the Brazilian scientific community. And to fill this need, we intend to approach the subject in a simple and didactic way for students and researchers who are starting in this very promising and important area. We will describe the fully explained theory of machine learning by applying QSAR, abstracting the complexity, and well-illustrated. structureactivity activity (QSAR (ML statistics MLbased based screening prediction etc describepredict predict Portuguese algorithms community need area complexity wellillustrated. wellillustrated well illustrated. illustrated well-illustrated