Thesis Recuperación de minerales remanentes de mina la cuenca mediante método de explotación subterráneo
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Date
2022-06
Authors
Journal Title
Journal ISSN
Volume Title
Program
DEPARTAMENTO DE INGENIERÍA METALÚRGICA Y DE MATERIALES. INGENIERÍA CIVIL DE MINAS
Campus
Campus Santiago San Joaquín
Abstract
El presente trabajo de título fue desarrollado para Compañía Minera Cerro Negro en su faena de Cabildo, Valparaíso, el cual consiste en un estudio de prefactibilidad para incorporar recursos remanentes al plan de largo plazo mediante la extracción por hundimiento con el objetivo de aumentar la vida útil de la faena.
El plan de largo plazo consiste en la explotación de cuatro zonas mediante el método de tajo abierto, el recurso de interés se encuentra ubicado entre dos de los cuatro sectores y se denomina Recurso Remanente debido a que anteriormente se explotó parcialmente de forma subterránea utilizando los métodos de Cámaras y Pilares y Caserones Vacíos por tratarse de un manto profundo.
Como resultado de la explotación subterránea, se tiene que uno de los caserones (caserón Júpiter) no se mantuvo vacío y se desplomó con efectos de subsidencia, lo cual confirma que la roca de sobrecarga es hundible y, por lo tanto, es posible explotar el manto por el método de Hundimiento por Subniveles.
Los antecedentes recopilados incluyen información topográfica superficial de la explotación proyectada del plan de largo plazo, información topográfica de la explotación subterránea antigua, resultados de mapeos históricos realizados en el sector, información de leyes de cobre y plata del manto y el paquete litológico existente.
Del estudio se desprende el diseño necesario para la extracción del Recurso Remanente, los planes de producción y operación, plan de desarrollo y preparación, ventilación y evaluación económica. La explotación se inicia en la pared oeste del caserón hundido y relleno, extendiéndose desde ahí hasta completar la explotación del mineral remanente en su entorno.
Se evalúan dos escenarios utilizando distintas tasas de extracción: 2.000 (tpd) y 3.000 (tpd) respectivamente, la selección se hace en base al mejor IVAN.
Los resultados muestran que existe un negocio atractivo para Compañía Minera Cerro Negro por lo que se recomienda pasar a las siguientes etapas de la ingeniería
This work was developed for Compañía Minera Cerro Negro at its mine site in Cabildo, Valparaíso, which consists of a pre-feasibility study to incorporate remaining resources into the long-term plan through extraction by caving with the objective of increasing life of mine. The long-term plan consists of the exploitation of four zones using the open pit method, the mineral resources is located between two of the four sectors and is called Remaining Resource because it was previously partially exploited using underground methods like Room and Pillars and Open Stopes because it is a deep mantle. As a result of underground exploitation, one of the stopes (Jupiter stope) was not kept empty and collapsed with subsidence effects, which confirms that the overburden rock is sinkable and, therefore, it is possible to exploit the mantle by the Sublevel Caving method. The information collected includes surface topographic information on the projected exploitation of the long-term plan, topographic information on the old underground exploitation, results of historical mapping in the sector, information on copper and silver grades from the mantle and the existing lithologies in the mine site. The study reveals the necessary design for the extraction of the Remaining Resource, the production and operation plans, the development and preparation plan, ventilation, and economic evaluation. The exploitation begins on the west wall of the caved and filled stope, extending from there until completing the exploitation of the remaining ore in its surroundings. Two scenarios were evaluated using different extraction rates: 2,000 [tpd] and 3,000 [tpd] respectively, the selection is made based on the best PIR. The results show that there is an attractive business for Compañía Minera Cerro Negro, so it is recommended to advance to the next stages of engineering
This work was developed for Compañía Minera Cerro Negro at its mine site in Cabildo, Valparaíso, which consists of a pre-feasibility study to incorporate remaining resources into the long-term plan through extraction by caving with the objective of increasing life of mine. The long-term plan consists of the exploitation of four zones using the open pit method, the mineral resources is located between two of the four sectors and is called Remaining Resource because it was previously partially exploited using underground methods like Room and Pillars and Open Stopes because it is a deep mantle. As a result of underground exploitation, one of the stopes (Jupiter stope) was not kept empty and collapsed with subsidence effects, which confirms that the overburden rock is sinkable and, therefore, it is possible to exploit the mantle by the Sublevel Caving method. The information collected includes surface topographic information on the projected exploitation of the long-term plan, topographic information on the old underground exploitation, results of historical mapping in the sector, information on copper and silver grades from the mantle and the existing lithologies in the mine site. The study reveals the necessary design for the extraction of the Remaining Resource, the production and operation plans, the development and preparation plan, ventilation, and economic evaluation. The exploitation begins on the west wall of the caved and filled stope, extending from there until completing the exploitation of the remaining ore in its surroundings. Two scenarios were evaluated using different extraction rates: 2,000 [tpd] and 3,000 [tpd] respectively, the selection is made based on the best PIR. The results show that there is an attractive business for Compañía Minera Cerro Negro, so it is recommended to advance to the next stages of engineering
Description
Keywords
Tajo abierto, Mina subterranea, Reservas mineras