Modelamiento estructural de la ocurrencia y distribución del arsénico en el yacimiento Rosario, distrito Collahuasi, región de Tarapacá, Chile
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2021
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es
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Universidad Andrés Bello
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Licencia CC
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Resumen
El Yacimiento Rosario ubicado en el Distrito Collahuasi perteneciente a “Compañía Minera Doña Inés de Collahuasi” es un depósito tipo pórfido Cu – Mo (Cobre – Molibdeno) con sobreimposición epitermal de alta sulfuración ubicado en el extremo norte del sistema de fallas de Domeyko, asociado al cinturón de Pórfidos de Cu de la franja metalogénica del Eoceno Tardío – Oligoceno Temprano.
Los depósitos de Pórfidos Cu – Mo con sobreimposición epitermal de alta sulfuración se le asocian grandes cantidades de arsénico (As), siendo este un elemento que es asociado a sistemas de fractura de la corteza superior en las etapas tardías de estos sistemas hidrotermales.
Los datos presentados en este estudio tienen como objetivo comprender la ocurrencia y distribución del arsénico en el Yacimiento Rosario con el propósito de disminuir la incertidumbre geológica que permita contribuir en la disminución en los costos de producción de Cu.
En el presente trabajo se integraron datos de sondajes y datos estructurales de superficie, y subsuperficie con Acoustic Televiewer (ATV), a fin de modelar dominios geológicos y tendencias estructurales con arsénico en profundidad, las que se presentan con una fuerte impronta NW relacionada a las fallas principales del yacimiento, seguido de tendencias NNE – NE con orientaciones EW y NS, asociadas mayormente a zonas de daño en alteraciones cuarzo – sericita (QS), argílica y argílica avanzada con enargita y scorodita.
De acuerdo con la integración realizada, se propone que el arsénico es un elemento controlado estructuralmente asociado a fluidos hidrotermales tardíos y que además es un excelente vector para delimitar estructuras que pudieron ser afectadas por estos.
The Rosario deposit located in the Collahuasi District is owned by Compañía Minera Inés de Collahuasi. It is a porphyry Cu - Mo deposit with an overlapping high sulfidation epithermal system, it is located in the northern end of the Domeyko Fault System, related to the porphyry copper deposit belt taking place between Late Eocene – Early Oligocene. Porphyry Cu – Mo deposits with superimposed high sulfidation systems are associated with large concentrations of arsenic (As), where this element is related with fracture systems of the upper crust in the late stages of these hydrothermal systems. The data presented in this study, aims to comprehend the occurrence and distribution of arsenic in the Rosario deposit, with the purpose of decreasing the geological uncertainty in order to contribute to the efficiency regarding Cu production costs. In addition, drilling data, surface and sub-surface structural data were integrated with Acoustic Televiewer (ATV) in pursuance to model geological domains and structural trends with arsenic in depth, where there is a strong NW imprint related to the main faults of the deposit, followed by NNE - NE trends with EW and NS orientations mainly associated with damage zones in quartz – sericite (QS), argillic and advanced argillic alteration zones with the occurrence of enargite and scorodite. According to the data brought together, it is proposed that arsenic is a structurally controlled element associated with late stages of hydrothermal fluids, demonstrating that is also an excellent pathfinder vector for the delimitation of structures that could be affected by them.
The Rosario deposit located in the Collahuasi District is owned by Compañía Minera Inés de Collahuasi. It is a porphyry Cu - Mo deposit with an overlapping high sulfidation epithermal system, it is located in the northern end of the Domeyko Fault System, related to the porphyry copper deposit belt taking place between Late Eocene – Early Oligocene. Porphyry Cu – Mo deposits with superimposed high sulfidation systems are associated with large concentrations of arsenic (As), where this element is related with fracture systems of the upper crust in the late stages of these hydrothermal systems. The data presented in this study, aims to comprehend the occurrence and distribution of arsenic in the Rosario deposit, with the purpose of decreasing the geological uncertainty in order to contribute to the efficiency regarding Cu production costs. In addition, drilling data, surface and sub-surface structural data were integrated with Acoustic Televiewer (ATV) in pursuance to model geological domains and structural trends with arsenic in depth, where there is a strong NW imprint related to the main faults of the deposit, followed by NNE - NE trends with EW and NS orientations mainly associated with damage zones in quartz – sericite (QS), argillic and advanced argillic alteration zones with the occurrence of enargite and scorodite. According to the data brought together, it is proposed that arsenic is a structurally controlled element associated with late stages of hydrothermal fluids, demonstrating that is also an excellent pathfinder vector for the delimitation of structures that could be affected by them.
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Tesis (Geólogo)
Palabras clave
Yacimientos Minerales, Arsénico, Impacto Ambiental, Estructura de la Superficie Terrestre, Datos Estadísticos, Tarapacá-Chile