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espanolLa Faja Piritica Iberica, en la que se ubican mas de 70 yacimientos de sulfuros masivos volcanogenicos, constituye una provincia metalogenetica a escala mundial, con unos recursos considerables en azufre, hierro y metales basicos y en menor medida oro y plata. El Instituto Geologico y Minero de Espana (IGME), en el sector de las investigaciones minero-metalurgicas, ha participado en diversos proyectos encaminados a la recuperacion del oro de este tipo de mineralizaciones. Una buena parte de su labor investigadora, en el ambito de la hidrometalurgia, se ha centrado en la busqueda de tratamientos alternativos de las menas auriferas refractarias, tan caracteristicas de la Faja Piritica, contemplando simultaneamente la recuperacion de los metales basicos y del oro contenido en dichas menas, asi como la extraccion de cualquier otro metal minoritario, susceptible de beneficio economico, que pudiera contribuir a la reduccion de los costes de explotacion. A tal fin, se han combinado metodos de tratamiento tradicionales, como la cianuracion, con otros de caracter innovador, tales como la lixiviacion acida a presion, la tostacion oxidante, la lixiviacion ferrica a presion atmosferica y la biolixiviacion. EnglishThe Pyritic Belt is a world class metalogenetic province, with more than 70 known deposits of volcanogenic massive sulphides. These deposits contain relevant resources of sulphur, iron, basic metals and, to a lesser extent, gold and silver. The Spanish Geological Survey (IGME) has recently played a main role in several activities related to the research, exploration and production of gold. As a part of this public research, some of the developments of IGME in the field of hydrometallurgy have been dedicated to the alternative treatment of refractory gold ores, which are quite abundant in the Pyritic Belt. These treatments aim to recover the gold contained in such ores, plus the extraction of any other metal that may lead to an economic benefit, thus reducing production costs. To achieve this goal, some traditional treatments such as cyanidation may be used in combination with innovative ones, such as high pressure acid leaching, oxidizing roasting and bioleaching.

El beneficio del oro en minerales refractarios de la Faja Pirítica