<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692022000300251</article-id>
<article-id pub-id-type="doi">10.22201/igeof.00167169p.2022.61.3.2207</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Gamma-ray spectrometry applied in the identification of potential acid mine drainage generation zones in waste rock pile with uranium ore and associated sulfides (Caldas, Brazil)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gastmaier Marques]]></surname>
<given-names><![CDATA[Anna Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreira]]></surname>
<given-names><![CDATA[César Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stanfoca Casagrande]]></surname>
<given-names><![CDATA[Matheus Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldana Arcila]]></surname>
<given-names><![CDATA[Erika Juliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Estadual Paulista Department of Geology ]]></institution>
<addr-line><![CDATA[Rio Claro SP]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Católica de Manizales Departament of Engineering and Architecture ]]></institution>
<addr-line><![CDATA[Manizales Caldas]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<volume>61</volume>
<numero>3</numero>
<fpage>251</fpage>
<lpage>266</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692022000300251&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692022000300251&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692022000300251&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Metal mining deeply modifies local environmental dynamics and produces large volumes of waste rock and residues, which is expected to be carefully disposed in order to prevent soil, water, and environment degradation. The Osamu Utsumi mine was a pioneer uranium ore exploitation site in Brazil, located in the State of Minas Gerais. The open pit and the high concentration of sulfide in waste rock piles are nowadays a dispendious concern to the Nuclear Industries of Brazil (INB, in Portuguese), due to sulfide oxidation and the resultant acid mine drainage (AMD). The objective of this research is to analyze the correlation between gamma-ray spectrometry data and the generation of AMD in a waste rock pile, locally known as BF-04. Potassium concentrations can be used to distinguish zones of rock depletion, lowest concentrations, and radioelement sedimentation. The radiometric data acquisition combined with previous studies indicates that high uranium and thorium concentrations are associated with high sulfide zones. The mineralized uranium ore includes sulfides that are rapidly destroyed by surface hydration conditions, responsible for generating acid mine drainage. In this sense, superficial zones in the waste rock pile with high levels of eU and eTh are areas exposed to oxidation and hydration of sulfides, and, therefore, their recognition and neutralization can contribute to decrease AMD generation in the study site and areas with similar characteristics. The gamma-ray spectrometry results can subsidize more effective and low-cost remediation techniques.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La minería de metales modifica profundamente la dinámica ambiental local y produce grandes volúmenes de roca y residuos, los cuales se espera sean eliminados cuidadosamente para evitar el deterioro del suelo, el agua y el medio ambiente. La mina Osamu Utsumi fue un sitio de explotación de mineral de uranio pionero en Brasil, ubicado en el estado de Minas Gerais. La mina abierta y la alta concentración de sulfuro en las capas de material estéril son hoy en día un tema de preocupación para las Industrias Nucleares de Brasil (INB), debido a la oxidación del sulfuro y el drenaje ácido de la mina resultante (AMD, por sus siglas en inglés). El objetivo de esta investigación es analizar los datos de espectrometría de rayos gamma y la generación de AMD en una capa de material estéril, BF-04, en el sitio. La adquisición de datos radiométricos combinada con estudios previos indica que las altas concentraciones de uranio y torio están asociadas con zonas de alto contenido de sulfuro. El mineral de uranio mineralizado incluye sulfuros que se destruyen rápidamente por las condiciones de hidratación de la superficie y son responsables de generar el drenaje ácido de la mina. En este sentido, las zonas superficiales de la capa de material estéril con altos niveles de eU y eTh son áreas expuestas a la oxidación e hidratación de sulfuros y, por lo tanto, su reconocimiento y neutralización pueden contribuir a disminuir la generación de AMD en el sitio de estudio y áreas con condiciones similares. Los resultados de la espectrometría de rayos gamma pueden ser de interés para una remediación de bajo costo en el entorno local.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[minería]]></kwd>
<kwd lng="es"><![CDATA[contaminación]]></kwd>
<kwd lng="es"><![CDATA[aguas subterráneas]]></kwd>
<kwd lng="es"><![CDATA[geofísica]]></kwd>
<kwd lng="es"><![CDATA[medio ambiente]]></kwd>
<kwd lng="es"><![CDATA[radiactividad]]></kwd>
<kwd lng="en"><![CDATA[mining]]></kwd>
<kwd lng="en"><![CDATA[pollution]]></kwd>
<kwd lng="en"><![CDATA[groundwater]]></kwd>
<kwd lng="en"><![CDATA[geophysics]]></kwd>
<kwd lng="en"><![CDATA[environment]]></kwd>
<kwd lng="en"><![CDATA[radioactivity]]></kwd>
</kwd-group>
</article-meta>
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