<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222019000100139</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2019v71n1a8</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ensayo geometalúrgico para la recuperación de oro de la zona de sulfuros primarios de la mina La Herradura, Sonora, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Geometallurgic essay for gold retrieval in the primary sulfide zone of the La Herradura mine, Sonora, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Segura]]></surname>
<given-names><![CDATA[Efrén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Valle]]></surname>
<given-names><![CDATA[Juan Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orozco-Rivera]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosales-Suárez]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Peñuñuri]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sonora Departamento de Geología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Gerencia de Proyectos Mineros  ]]></institution>
<addr-line><![CDATA[ Sonora]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Investigación y Desarrollo Tecnológico Servicios Especializados Peñoles S.A. de C.V.  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Laboratorio Tecnológico de Metalurgia LTM  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>71</volume>
<numero>1</numero>
<fpage>139</fpage>
<lpage>168</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222019000100139&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222019000100139&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222019000100139&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La mina La Herradura, en Sonora, constituye uno de los distritos de oro más importantes de México, con una producción a la fecha superior a 5.5 millones de onzas de oro durante 17 años. Forma parte de un cinturón de yacimientos de oro orogénico que se extiende en dirección noroeste-sureste por más de 300 km de largo y 50 km de ancho. La mineralización consiste en vetas y enrejados de vetillas de cuarzo formadas en un ambiente geológico dúctil-frágil, que se hospeda en gneises cuarzo feldespáticos del Proterozoico. Los cuerpos mineralizados, definidos por una ley mínima de corte (cut off) de 0.3 g/t de Au tienen formas tabulares y alcanzan hasta 1 km de largo, 1 km de profundidad y 100 m de ancho. El control visual de la mineralización es la constancia de vetas y vetillas de cuarzo y una alteración hidrotermal sericítica persistente. Para este trabajo se utilizaron diferentes técnicas, poniendo énfasis en el programa Mineral Liberation Analizer (MLA), con el objeto de probar la posibilidad de predecir el oro recuperable en la mina, para la zona de sulfuros primarios. Se definieron 3 zonas geometalúrgicas (Zonas A, B y C) de las cuales se hicieron compósitos y concentrados gravimétricos. La composición modal de los concentrados es de cuarzo, feldespato y muscovita (sericita) y una mineralogía metálica de pirita, esfalerita, galena, magnetita, oro y telururos de oro y plata. El oro se identifica como inclusiones en pirita o en diversas gangas como cuarzo, albita, ortoclasa o ankerita, así como en películas en el borde pirita. La composición del oro es electrum con 74 % de Au y 26 % de Ag; también se identificó la presencia de petzita (Ag3AuTe2) y stutzita (AgTe). Se calcularon constantes de recuperación para cada zona geometalúrgica las cuales, incorporadas al modelo informático de recursos calculados en más de 14 millones de onzas de oro, indicaron rangos de error en oro recuperable de menos de 4 % para la Zona A, 6 % para la Zona C y 13 % para la Zona B, en relación con cálculos tradicionales efectuados con datos experimentales. Los resultados son aceptables para aplicar esta metodología al depósito. El rango de error más acusado en la Zona B se interpreta como causado por un &#8220;efecto pepita&#8221; muy común en este tipo de yacimientos. Se concluye también que un proceso de remolienda, incorporado actualmente a la planta de beneficio, es probablemente innecesario, lo cual implicaría un ahorro notable en energía y en la economía de la mina.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract La Herradura mine in Sonora is one of the most important gold districts in Mexico producing more than 5.5 million ounces of gold over 17 years. It is part of an orogenic gold deposits belt with a northwest-southeast direction for 300 km long and 50 kmwide. The mineralization consists of veins and quartz networks veinlets formed in a brittle-ductil geologic environment and it is hosted in Proterozoic quartz-feldspar gneisses. The ore bodies, defined by a 0.3 g/t Au cut-off grade, have tabular forms up to 1 km in length, 1 km in depth and 100 m in width. The visual control for mineralization is the abundance of quartz veins and veinlets, and a persistent sericitic hydrothermal alteration. Different techniques were used in this work with special focus on the Mineral Liberation Analizer (MLA) program to prove the possibility of predicting recoverable gold in the mine for the primary sulphide zone. Three geometallurgical zones (Zones A, B and C) were defined by ore composites and gravimetric concentrates from the same composites. Modal composition of the concentrates is quartz, feldspar and muscovite (sericite), and a metallic mineralogy of pyrite, sphalerite, galena, magnetite, gold and tellurides of gold and silver. Gold is identified as inclusions in pyrite or in gangue minerals like quartz, albite, orthoclase or ankerite, as well as coating pyrite crystals. The gold composition is electrum with 74 % Au and 26 % Ag; the presence of petzite (Ag3AuTe2) and stutzite (AgTe) were also identified. Recovery constants were calculated for each geometallurgical zone, which were introduced to the resource model of more than 14 million ounces of gold, indicating that error range in recoverable gold is less than 4 % for Zone A, 6 % for Zone C and 13 % for Zone B, in relation with gold recovery calculated with traditional methods. These results could be acceptable to applicate this methodology to La Herradura deposit. The most important error range in the Zone B is interpreted as due to a nugget effect, which isvery common in such mineral deposits. It is also concluded that the secondary milling process currently incorporated to the metallurgical plant is probably unnecessary, so its removal would result in a significant saving in energy and therefore in the economy of the mine.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[La Herradura]]></kwd>
<kwd lng="es"><![CDATA[oro]]></kwd>
<kwd lng="es"><![CDATA[geometalurgia]]></kwd>
<kwd lng="es"><![CDATA[Mineral Liberation Analizer]]></kwd>
<kwd lng="es"><![CDATA[Sonora]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Herradura]]></kwd>
<kwd lng="en"><![CDATA[gold]]></kwd>
<kwd lng="en"><![CDATA[geometallurgy]]></kwd>
<kwd lng="en"><![CDATA[Mineral Liberation Analizer]]></kwd>
<kwd lng="en"><![CDATA[Sonora]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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