<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742025000200060</article-id>
<article-id pub-id-type="doi">10.22201/igc.20072902e.2025.2.1857</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mineralogical characterization of gold alluvial sands preconcentrates in the mining districts of Huepetuhe and Delta 1, Madre de Dios Department, Peru]]></article-title>
<article-title xml:lang="es"><![CDATA[Caracterización mineralógica de preconcentrados aluviales de arena aurífera en los distritos mineros de Huepetuhe y Delta 1, Departamento Madre de Dios, Perú]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Merino]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Marroquín]]></surname>
<given-names><![CDATA[Mery]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Telmer]]></surname>
<given-names><![CDATA[Kevin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paccha]]></surname>
<given-names><![CDATA[Cesar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Ingeniería Facultad de Ingeniería Ambiental ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Ingeniería Facultad de Ingeniería Geológica, Minera y Metalúrgica Escuela Profesional de Ingeniería Metalúrgica]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Artisanal Gold Enterprises Inc.  ]]></institution>
<addr-line><![CDATA[Victoria BC]]></addr-line>
<country>Canada</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<fpage>60</fpage>
<lpage>72</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742025000200060&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742025000200060&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742025000200060&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Artisanal and small-scale gold miners (ASGM) in the Madre de Dios Department, Peru, use mercury for gold processing, making it the primary source of environmental contamination. However, the lack of geochemical and mineralogical characterization of alluvial preconcentrates limits the search for alternative metallurgical processes. To address this, seven samples of alluvial preconcentrates (CQI-04, CQI-05, DAI-01, DAI-02, DAI-03, DAI-29, DAI-Hg-06) from two mining concessions in the Huepetuhe and Delta 1 mining districts were analyzed to determine their geochemical and mineralogical composition. The study included X-ray fluorescence (XRF) and inductively coupled plasma mass spectrometry (ICP-MS), as well as X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), and sieve analysis with fire assay for gold quantification. The samples of the Puerto Belén concession, located in the Huepetuhe district, contain more than 80 % coarse gold particles (&gt;250 µm), are rich in iron oxides (ilmenite, magnetite, hematite), quartz, and contain minor amounts of andalusite, zircon, and unidentified phases containing light rare earth elements (LREE). The samples of the Raul 1 concession, in the Delta 1 district, have 50 % medium-sized gold particles (106-250 µm), 28 % fine gold (&lt;106 µm), and 23 % coarse gold (&gt;250 µm), with dominant quartz content, followed by hematite, ilmenite, zircon, rutile, muscovite, and LREE-bearing phases. In both concessions, gold exhibits high purity (99 % Au, 1 % Ag). Optical and electron microscopy analyses reveal sub-rounded to elongated gold particles within ferritic and siliceous matrices. Understanding the geochemical and mineralogical characteristics of alluvial preconcentrates is essential for proposing mercury-free metallurgical alternatives that enhance gold recovery and enable the extraction of other economically valuable minerals such as iron, titanium, zircon, and rare earth elements.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los mineros artesanales y de pequeña escala (ASGM, por sus siglas en inglés) en el Departamento Madre de Dios, Perú, utilizan mercurio para el procesamiento del oro, lo que constituye una problemática ambiental. Sin embargo, la falta de caracterización geoquímica y mineralógica de los preconcentrados aluviales limita la búsqueda de procesos metalúrgicos alternativos. Para abordar esta problemática, se analizaron siete muestras de preconcentrados aluviales (CQI-04, CQI-05, DAI-01, DAI-02, DAI-03, DAI-29, DAI-Hg-06) de dos concesiones mineras en los distritos mineros de Huepetuhe y Delta 1, con el objetivo de determinar su composición geoquímica y mineralógica. El estudio incluyó fluorescencia de rayos X (XRF) y espectrometría de masas con plasma de acoplamiento inductivo (ICP-MS), así como difracción de rayos X (XRD), microscopía óptica (OM), microscopía electrónica de barrido (SEM) y análisis granulométrico con ensayo al fuego para la cuantificación de oro. En las muestras de la concesión de Puerto Belén, ubicada en el distrito de Huepetuhe, el oro ocurre en más del 80 % en partículas gruesas (&gt;250 µm), acompañadas de óxidos de hierro (ilmenita, magnetita, hematita), cuarzo y cantidades subordinadas de andalucita, circón y fases no identificadas con elementos de tierras raras ligeras (LREE, por sus siglas en inglés). La concesión Raúl 1, en el distrito Delta 1, tiene 50 % de partículas de oro de tamaño medio (106-250 µm), 28 % de oro fino (&lt;106 µm) y 23 % de oro grueso (&gt;250 µm), con contenido dominante de cuarzo, seguido de hematita, ilmenita, circón, rutilo, moscovita y fases portadoras de LREE. En ambas concesiones, el oro presenta una alta pureza (99 % Au, 1 % Ag). Los análisis mediante microscopía óptica y electrónica revelan partículas de oro subredondeadas a elongadas dentro de matrices ferríticas y silíceas. La comprensión de las características geoquímicas y mineralógicas de los preconcentrados aluviales es fundamental para proponer alternativas metalúrgicas libres de mercurio que mejoren la recuperación del oro y permitan la extracción de otros minerales de interés económico, como hierro, titanio, circón y tierras raras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[artisanal mining]]></kwd>
<kwd lng="en"><![CDATA[small-scale mining]]></kwd>
<kwd lng="en"><![CDATA[alluvial preconcentrate]]></kwd>
<kwd lng="en"><![CDATA[geochemistry]]></kwd>
<kwd lng="en"><![CDATA[mineralogy]]></kwd>
<kwd lng="en"><![CDATA[beneficiation]]></kwd>
<kwd lng="en"><![CDATA[gold]]></kwd>
<kwd lng="en"><![CDATA[mercury]]></kwd>
<kwd lng="en"><![CDATA[rare earth elements]]></kwd>
<kwd lng="en"><![CDATA[mining district]]></kwd>
<kwd lng="en"><![CDATA[Huepetuhe]]></kwd>
<kwd lng="en"><![CDATA[Delta 1]]></kwd>
<kwd lng="en"><![CDATA[Madre de Dios]]></kwd>
<kwd lng="en"><![CDATA[Peru]]></kwd>
<kwd lng="es"><![CDATA[minería artesanal]]></kwd>
<kwd lng="es"><![CDATA[minería de pequeña escala]]></kwd>
<kwd lng="es"><![CDATA[preconcentrado aluvial]]></kwd>
<kwd lng="es"><![CDATA[geoquímica]]></kwd>
<kwd lng="es"><![CDATA[mineralogía]]></kwd>
<kwd lng="es"><![CDATA[beneficio]]></kwd>
<kwd lng="es"><![CDATA[oro]]></kwd>
<kwd lng="es"><![CDATA[mercurio]]></kwd>
<kwd lng="es"><![CDATA[tierras raras]]></kwd>
<kwd lng="es"><![CDATA[distrito minero]]></kwd>
<kwd lng="es"><![CDATA[Huepetuhe]]></kwd>
<kwd lng="es"><![CDATA[Delta 1]]></kwd>
<kwd lng="es"><![CDATA[Madre de Dios]]></kwd>
<kwd lng="es"><![CDATA[Perú]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Alves]]></surname>
<given-names><![CDATA[K. D. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[S. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Barreiro]]></surname>
<given-names><![CDATA[J. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Palomares]]></surname>
<given-names><![CDATA[R. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Prieto]]></surname>
<given-names><![CDATA[J. M. C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Morphological and compositional analysis of alluvial gold: The Fresnedoso gold placer (Spain)]]></article-title>
<source><![CDATA[Ore Geology Reviews]]></source>
<year>2020</year>
<volume>121</volume>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<collab>Artisanal Gold Council</collab>
<source><![CDATA[Reporte de Inventario: Estimaciones de referencia del uso y consumo de mercurio en la minería de oro artesanal y de pequeña escala en Perú, Proyecto: Plan Nacional de Acción sobre Mercurio en el sector de la Minería de oro Artesanal y de Pequeña escala en el Perú]]></source>
<year>2017</year>
<publisher-loc><![CDATA[Perú ]]></publisher-loc>
<publisher-name><![CDATA[Ministerio del Ambiente]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<collab>Artisanal Gold Council</collab>
<source><![CDATA[Reporte interno: Piloto IV uso de tecnologías limpias libre de mercurio]]></source>
<year>2022</year>
<publisher-name><![CDATA[Artisanal Gold Council]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aranda]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Hacia la localización de minerales pesados en el Perú]]></source>
<year>1999</year>
<conf-name><![CDATA[ Simposium Internacional de Minerales Industriales del Perú]]></conf-name>
<conf-loc> </conf-loc>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Song]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Cai]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Mineralogical characteristics of a micro-fine and low grade refractory gold ore]]></source>
<year>2017</year>
<conf-name><![CDATA[ International Conference on Materials Applications and Engineering (ICMAE 2017)]]></conf-name>
<conf-loc>Qingdao, China </conf-loc>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Craw]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Lilly]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gold nugget morphology and geochemical environments of nugget formation, southern New Zealand]]></article-title>
<source><![CDATA[Ore Geology Reviews]]></source>
<year>2016</year>
<volume>79</volume>
<page-range>301-15</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Delgado Madera]]></surname>
<given-names><![CDATA[G. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Benavente Escobar]]></surname>
<given-names><![CDATA[C. L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación del río Vilcanota en el distrito de San Salvador, Provincia de Calca - región Cusco]]></source>
<year>2011</year>
<publisher-name><![CDATA[Instituto Geológico, Minero y Metalúrgico]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Espin]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Perz]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Environmental crimes in extractive activities: Explanations for low enforcement effectiveness in the case of illegal gold mining in Madre de Dios, Peru]]></article-title>
<source><![CDATA[The Extractive Industries and Society]]></source>
<year>2021</year>
<volume>8</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>331-9</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Galloso Carrasco]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Steinmüller]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Pari Pinto]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación geológico-minera por oro y dispersión de mercurio en el río Madre de Dios (Boca del río Colorado-lago Sandoval) y estudio geofísico de las áreas: Huepetuhe, Caychihue, Puquiri y Puerto Carlos]]></source>
<year>1996</year>
<publisher-name><![CDATA[Instituto Geológico, Minero y Metalúrgico]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huamán-Paredes]]></surname>
<given-names><![CDATA[F. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Palma-Figueroa]]></surname>
<given-names><![CDATA[G. U.]]></given-names>
</name>
<name>
<surname><![CDATA[Flores-del Pino]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Caracterización preliminar de residuos de minería aluvial en la región Madre de Dios - Perú]]></article-title>
<source><![CDATA[Revista Cubana de Química]]></source>
<year>2020</year>
<volume>32</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>232-44</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lanckneus]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Los placeres auríferos de Madre de Dios (SE Perú)]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Herai]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Fornari]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Yacimientos Aluviales de Oro, Actas del Simposio Internacional sobre Yacimientos Aluviales de Oro]]></source>
<year>1991</year>
<page-range>83-6</page-range><publisher-name><![CDATA[Institut Français de Recherche Scientifique pour le Développement en Coopération]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mathioudakis]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Xiroudakis]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Petrakis]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Manoutsoglou]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Alluvial gold mining technologies from ancient times to the present]]></article-title>
<source><![CDATA[Mining]]></source>
<year>2023</year>
<volume>3</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>618-44</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Medina]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Minerales pesados en gravas auríferas de Huepetuhe y Caychive (Madre de Dios)]]></source>
<year>1999</year>
<conf-name><![CDATA[ Simposium Internacional de Minerales Industriales del Perú]]></conf-name>
<conf-loc> </conf-loc>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mosquera]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[M. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pachas]]></surname>
<given-names><![CDATA[V. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Moschella]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio diagnóstico de la actividad minera artesanal en Madre de Dios]]></source>
<year>2009</year>
<publisher-loc><![CDATA[Perú ]]></publisher-loc>
<publisher-name><![CDATA[CooperAccion]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<collab>Observatorio Nacional de Política Criminal</collab>
<collab>United States Agency for International Development</collab>
<source><![CDATA[La minería ilegal en la Amazonía peruana]]></source>
<year>2021</year>
<publisher-name><![CDATA[Ministerio de Justicia y Derechos Humanos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Osores Plenge]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas Jaimes]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Manrique Lara Estrada]]></surname>
<given-names><![CDATA[C. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Minería informal e ilegal y contaminación con mercurio en Madre de Dios: Un problema de salud pública]]></article-title>
<source><![CDATA[Acta Médica Peruana]]></source>
<year>2012</year>
<volume>29</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-5</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Palacios-Torres]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[De la Rosa]]></surname>
<given-names><![CDATA[J. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Olivero-Verbel]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Trace elements in sediments and fish from Atrato River: An ecosystem with legal rights impacted by gold mining at the Colombian Pacific]]></article-title>
<source><![CDATA[Environmental Pollution]]></source>
<year>2020</year>
<volume>256</volume>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez Honores]]></surname>
<given-names><![CDATA[C. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Castro Sánchez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Loaiza Choque]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Reconocimiento de las actividades mineras y metalúrgicas en la cuenca de los ríos Madre de Dios e Inambari]]></source>
<year>2003</year>
<publisher-name><![CDATA[Instituto Geológico, Minero y Metalúrgico]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Prater]]></surname>
<given-names><![CDATA[L. S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Black Sands]]></source>
<year>1957</year>
<publisher-name><![CDATA[Idaho Bureau of Mines and Geology]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Velásquez Ramírez]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Guerrero Barrantes]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Gamarra Miranda]]></surname>
<given-names><![CDATA[L. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Pillaca]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tello Peramas]]></surname>
<given-names><![CDATA[L. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Bazán Tapia]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Heavy metals in alluvial gold mine spoils in the Peruvian Amazon]]></article-title>
<source><![CDATA[CATENA]]></source>
<year>2020</year>
<volume>189</volume>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sousa]]></surname>
<given-names><![CDATA[R. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Veiga]]></surname>
<given-names><![CDATA[M. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Klein]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Telmer]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Gunson]]></surname>
<given-names><![CDATA[A. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bernaudat]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Strategies for reducing the environmental impact of reprocessing mercury-contaminated tailings in the artisanal and small-scale gold mining sector: Insights from Tapajos River Basin, Brazil]]></article-title>
<source><![CDATA[Journal of Cleaner Production]]></source>
<year>2010</year>
<volume>18</volume>
<numero>16-17</numero>
<issue>16-17</issue>
<page-range>1757-66</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Uba]]></surname>
<given-names><![CDATA[C. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Strecker]]></surname>
<given-names><![CDATA[M. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Schmitt]]></surname>
<given-names><![CDATA[A. K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Increased sediment accumulation rates and climatic forcing in the central Andes during the late Miocene]]></article-title>
<source><![CDATA[Geology]]></source>
<year>2007</year>
<volume>35</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>979-82</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Velásquez Ramírez]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Metales en suelos explotados por la pequeña minería aurífera aluvial en Madre de Dios, Perú]]></source>
<year>2017</year>
<publisher-name><![CDATA[Universidad Nacional Agraria la Molina]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Velásquez Ramírez]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Guerrero Barrantes]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Gamarra Miranda]]></surname>
<given-names><![CDATA[L. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Pillaca]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tello Peramas]]></surname>
<given-names><![CDATA[L. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Bazán Tapia]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Heavy metals in alluvial gold mine spoils in the Peruvian Amazon]]></article-title>
<source><![CDATA[CATENA]]></source>
<year>2020</year>
<volume>189</volume>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Qin]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiao]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Yang]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Cui]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Song]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Mineralogy and pretreatment of a refractory gold deposit in Zambia]]></article-title>
<source><![CDATA[Minerals]]></source>
<year>2019</year>
<volume>9</volume>
<numero>7</numero>
<issue>7</issue>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Youngson]]></surname>
<given-names><![CDATA[J. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Craw]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Variation in placer style, gold morphology, and gold particle behavior down gravel bed-load rivers: An example from the Shotover/Arrow-Kawarau-Clutha River system, Otago, New Zealand]]></article-title>
<source><![CDATA[Economic Geology]]></source>
<year>1999</year>
<volume>94</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>615-34</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
