FOREVER MINERALS
S.A.C
PLAN DE MINADO
PROYECTO “ANGELITO VII
2008
UBICACIÓN DISTRITO
: PACOHA
PROVINCIA
: ILO
DEPARTAMENTO
: MOQUEGUA
Lima
– Perú
ENERO 2012
”
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RESUMEN
El presente trabajo, “Plan de Minado – Proyecto Angelito VII
2008”,
describe, analiza y
estudia cada una de las etapas que se deben llevar a cabo para hacer el diseño de mina de un determinado yacimiento, estas etapas se inician con la exploración geológica, esta información será procesada con el fin de crear un modelo de bloques, donde se puede tener la información geológica, leyes de los diferentes afloramientos, etc. LA empresa FOREVER MINERALS S.A.C tiene la necesidad de explotar los yacimientos minerales de Hierro con Magnetita y Hematita en los distintos afloramientos ubicados dentro de la concesión, por lo que se procederá a realizar el análisis de la secuencia de minado, mostrando las etapas de la explotación así como la disposición de sus botaderos, durante el tiempo de vida operativo de la mina. Se mostrara la disposición de sus instalaciones dentro de la concesión y los accesos desde la panamericana sur hasta el área de operación de la mina. Se realizara un análisis del movimiento de tierras a realizarse durante el tiempo de vida de la mina, así como el consumo de explosivos y los equipos a utilizar durante la explotación.
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CAPITULO I ASPECTO GEOLOGICO
La información geológica para el diseño de la mina es necesaria y fundamental, sin ella solo se podrían hacer intentos y con seguridad el resultado no no sería exacto, por eso la importancia de contar con la mayor cantidad de información que nos permita diseñar la mina. mi na. 1.1 GEOLOGÍA REGIONAL. En la región del área estudiada afloran rocas metamórficas, ígneas y sedimentarias que abarcan en edad desde el Precambriano hasta el Cuaternario reciente.
La formación más antigua es la denominada Complejo Basal de la Costa en un área relativamente pequeña a la orilla del mar. Consiste de rocas metamórficas asociadas con intrusiones de granito rojo. Esta formación se considera de edad precambriana y constituye el basamento cristalino.
Las rocas del grupo Yamayo constituyen la unidad más baja del Mesozoico, está compuesta por 600 metros de arenisca, limolitas, lutitas y derrames volcánicos cuya edad se supone entre el Triásico superior y el Jurásico inferior.
1.2 GEOLOGÍA LOCAL En el área Afloran Rocas R ocas Intrusivas (Kt-gd.) y Volcánicas (Ji-vch) ,tipos granodiorita y andesitas verduscas rojizas por la coloración de los Ox. de Fe.
1. Mineralización de Magnetita
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Las Estructuras Mineralizadas siguen siguen un patrón NW-SE Potencias de las Estructuras mineralizadas 0.20-4.0 mt. Mineralización principal Magnetita-Hematita-Pirolusita Magnetita-Hematita-Pirolusita y óxidos de Fe. Potencial Estimado Estimado 4,840,000 TMS TMS 2. Superficie Estratigráfica
3. Columna Estratigráfica
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CAPITULO II MODELAMIENTO GEOLOGICO Este capítulo describe el modelamiento geológico, que va desde la representación gráfica de los afloramientos presentes en la concesión, hasta las secciones longitudinales representando la proyección de la estructura mineralizada. La interpretación geológica consiste en procesar la información obtenida en el campo y llevarla a planos y diferentes secciones. En cada sección impresa o en computadora se va haciendo la interpretación geológica mediante contorneos, los cuales al unirlos nos dará como resultado un objeto tridimensional, que en este caso representara a la estructura mineralizada. 2.1. UBICACIÓN DE AFLORAMIENTOS Y LEYES ANGELITO VII – 2008 ZONA ESTRUCTURA COORDENADA NORTE A 1 8,076,587 A 1 8,076,274 B 1 8,079,438 B 2 8,079,251 B 3 8,079,146
COORDENADA ESTE COTA Pot(m) % Fe 248,430 783 2.00 55.80 248,685 606 0.30 58.90 246,675 920 4.00 55.84 246,604 816 1.00 62.29 246,516 757 1.00 45.68
4. Representación Estructuras Mineralizadas 3D
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2.2. MODELO DE BLOQUES El modelo de bloques es una matriz tridimensional, cuyos bloques tienen una base cuadrada de una determinada longitud y una altura de los bloques, el modelo de bloques del presente trabajo es de dimensiones de 5 x 5 x 5 para la estructura mineralizada más potente y de dimensiones de 2 x 2 x 2 para las estructuras es tructuras mineralizadas mineralizadas menos potentes. 5. Vista Modelo Bloques
Este modelo de bloques debe ser inicializado con todas las variables que se necesiten modelar. Cada block consta de variables numéricas como: Topografía, Leyes de mineral, tipo de roca, etc. Es importante tener el modelamiento geológico en un sistema electrónico porque es la base para determinar las reservas geológicas y económicas, para el plan de minado a corto, mediano y largo plazo. 6. Representación de un Block Mineralizado
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2.3 RESERVAS Y RECURSOS MINERALES. Se define como recurso a un material que se sabe existe en la corteza terrestre o que de inferencia geológica bien documentada se juzga sea probable que exista, mas generalmente se llama recurso a aquellos productos que un país o regió n puede usar en su provecho. Las reservas se definen como un material mineral que se considera explotable bajo las condiciones existentes incluyendo costo, precio, tecnología y circunstancias locales. 7.Relación Secuencial en el Desarrollo de los Recursos
A continuación se muestra el cuadro de recursos y reservas minerales del proyecto minero, cabe indicar que los mismos están determinados por estudios preliminares, para una mejor estimación es necesario realizar exploraciones mediante perforaciones diamantinas. RESERVAS CLASE
Pot. (m)
GE
TMS
% Fe
Probado
3.25
5.2
125,520
49.10
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CAPITULO III CONSTRUCCIÓN CONSTRUCCIÓN DE ACCESOS 3.1. UBICACIÓN DEL PROYECTO. Los accesos carrozables se ejecutaran dentro del área de la concesión minera ANGELITO VII – 2008, la misma que se ubica a 36 km al norte de la ciudad de Ilo, por la carreta costanera. La concesión minera tiene un área superficial superficial de 800 hectáreas, hectáreas, siendo las coordenadas UTM de los vértices como sigue.
VERTICES
NORTE
ESTE
1 2 3 4 5 6 7 8
8 080 000 8 075 000 8 075 000 8 076 000 8 076 000 8 079 000 8 079 000 8 080 000
249 000 249 000 247 000 247 000 248 000 248 000 246 000 246 000
Hacia el Oeste colinda con el denuncio minero denominado JUNE FIELDS, al Este colinda
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caso las características portantes del terreno así lo amerite, el radio de giro de los desarrollos será lo suficientemente amplio como para tener la seguridad que pueda transitar vehículo de carga como volquetes y otros, así mismo cada 500 a 600 metros se tendrá un sobre ancho a la vía para el cruce de vehículos, este cobre ancho será de 3.5 m. por 15m de largo.
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TRAMO B: Progresiva Inicio
: N: 8 077 670, E: 245 665 Cota: 350 msnm
Progresiva Final
: N: 8 079 438, E: 246 650 Cota: 920 msnm
Longitud y Gradiente: 7.00 Km aprox. con 8% de Grad. Mayoritariamente Corte Material
: 22,000 m3 8. Sección Típica de Corte de la Trocha Carrozable
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CAPITULO IV DISEÑO DEL OPEN PIT 4.1. MODELAMIENTO GEOTECNICO En este capítulo se mostrara la importancia de la geotecnia para el diseño de minas a tajo abierto. El talud de trabajo o el talud final del tajo es uno de los principales elementos que afectan la forma y el tamaño del yacimiento, una pared echada o con un ángulo de talud bajo significa un mayor desbroce. La pared del tajo o pared de una determinada zona debe ser tal que tiene que permanecer estable mientras haya actividad en esta zona, la estabilidad debe de ser analizada cuidadosamente. La información geológica, calidad de la roca, fallas junturas presencia de agua, etc. son factores claves en la determinación del talud del tajo. Existe una gran variedad de métodos y sistemas de explotación a Tajo abierto a continuación se muestra su clasificación y campo de a plicación. 9. Tipos de Yacimientos y Métodos de Aplicación Utilizados
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4.2. CONSIDERACIONES BASICAS DE DISEÑO. La selección de los parámetros de diseño básicos, es extremadamente importante. Los parámetros a ser evaluados son los siguientes: Talud del Pit Pendiente Total y Pendiente local l ocal Ancho y pendiente del camino de transporte. Ancho e intervalo de bermas. Ubicación de la infraestructura i nfraestructura principal. Un cambio de un grado en la pendiente total, puede resultar
en un cambio de toda la
situación económica del proyecto. 4.3. DIMENSIONAMIENTO DEL TALUD DEL TAJO.
La selección para la altura de los bancos, se rige por el tamaño del equipamiento
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4.4. ANALISIS DE ESTABILIDAD EN CONDICIONES CONDIC IONES ESTATICAS Y SEUDOESTATICAS El análisis de condiciones estáticas se analiza por el método del Equilibrio Limite y en condiciones seudoestáticas en función de las aceleraciones isovalóricas, a continuación se muestra la salida del programa SLIDE 5.0, así como los factores de seguridad obtenidos en condición estática y seudoestáticas. El diseño de las paredes del pit, debe considerar los parámetros de resistencia del material que conforman las paredes, la orientación de la estructura rocosa, intervalo y ancho de bermas. Parámetros Geomecánicos Talud Open Pit Tipo de Roca Granodiorita Peso Especifico 26 KN/m3 Criterio de Falla Mohr Coulomb Angulo Fricción Interno (Ø) 38° Cohesión 32 KN/m2
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4.5 ANCHO Y PENDIENTE DEL CAMINO DE TRANSPORTE Las minas a tajo abierto, requieren a lo menos de un camino de transporte y en algunas ocasiones ocasiones más de uno, uno, dependiendo dependiendo de de la l a configuración del yacimiento a minar hasta alcanzar la profundidad definitiva. El punto de entrada a la mina para un camino de transporte, es un aspecto de diseño importante. La selección de este punto de entrada afectara los siguientes aspectos económicos y operacionales: El tiempo de ciclo que realiza el camión hasta la chancadora, los botaderos de estéril, etc. La ubicación de los límites final del pit, incluyendo el camino de transporte. Los costos de transporte son directamente proporcional al diseño del camino de
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JJ MITCHEL INGENIEROS S.A.C.
FOREVER MINERALS S.A.C
4.6. PLAN DE PRODUCCION El tiempo de vida estimado del proyecto ANGELITO VII-2008, es inicialmente 5 años, dada las características y ocurrencia de la mineralización, primero se ejecutaran desbroces de de las estructuras mineralizadas, para el inicio de un un nivel de producción producción y posterior desarrollo, descubriendo las zonas mineralizadas en bancos para separar las zonas estériles del mineral. La producción de mineral será a un ritmo de 10,500 TM/ Mes promedio, promedio, distribuidas de las zonas Sur-Este y Nor-Oeste. Nor-Oeste. Siendo Siendo 200 TM/día de esta zona y 150 TM/día de la zona Sur-Este. 4.7. TIEMPO DE VIDA DE LA MINA En los siguientes cuadros se muestra la producción estimada del open pit, tanto en
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JJ MITCHEL INGENIEROS S.A.C.
FOREVER MINERALS S.A.C
En los cuadros siguientes se muestra el plan de producción estimado, detallado por zonas de explotación Plan de Producción Anual – Por Zonas ZONA NOR- OESTE OESTE
AÑO 1
AÑO 2
AÑO 3
AÑO 4
AÑO 5
(TM/Año)
84,420
84,420
84,420
84,420
84,420
EXTRACCIÓN DE DESMONTE DESMONTE (TM/Año)
234,000
246,000
255,000
255,000
255,000
TOTAL
318,420
330,420
339,420
339,420
339,420
AÑO 1
AÑO 2
AÑO 3
AÑO 4
AÑO 5
(TM/Año)
41,580
41,580
41,580
41,580
41,580
EXTRACCIÓN DE DESMONTE DESMONTE (TM/Año)
546,000
574,000
595,000
595,000
595,000
TOTAL
587,580
615,580
636,580
636,580
636,580
EXTRACCIÓN DE MINERAL
(TM/Año)
ZONA SUR - ESTE
EXTRACCIÓN DE MINERAL
(TM/Año)
16. Minado Zona NW
15. Minado Zona SE
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JJ MITCHEL INGENIEROS S.A.C.
4.8. UBICACIÓN DE LAS ZONAS DE EXPLOTACIÓN.
FOREVER MINERALS S.A.C
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JJ MITCHEL INGENIEROS S.A.C.
FOREVER MINERALS S.A.C
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JJ MITCHEL INGENIEROS S.A.C.
FOREVER MINERALS S.A.C
4.9 EQUIPOS DE MINA PARA TAJO ABIERTO Las excavadoras, camiones de transporte, maquinas cargadoras y perforadoras, constituyen unidades primordiales en las minas a tajo abierto. Los quipos auxiliares típicos incluyen tractores, maquinas niveladoras, camiones de servicios, transportadores de explosivos, perforadoras secundarias y grúas. A continuación se muestra una relación de los equipos a utilizar durante la etapa de la explot ación de proyecto ANGELITO VII – 2008.
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JJ MITCHEL INGENIEROS S.A.C.
FOREVER MINERALS S.A.C
4.10. PARAMETROS DE PERFORACIÓN Y VOLADURA. A continuación se muestran los parámetros utilizados para el determinar el consumo explosivo proyectado proyectado la explotación del proyecto ANGELITO VII-2008. Malla de Perforación Burden 3.5 Espaciamiento 4.0 Altura de Banco 5.0 Diámetro Broca 5.0
metros metros metros Pulg.
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JJ MITCHEL INGENIEROS S.A.C.
FOREVER MINERALS S.A.C
CAPITULO V DEPOSITOS DE DESMONTE 5.1. DEPOSITO DE DESMONTE. Basado en la información técnica disponible, se desarrollo el plan para el depósito de desmonte en zonas cercanas a la operación, representando una buena alternativa donde se puede almacenar desmonte dadas las condiciones favorables de topografía,
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El depósito de desmonte ha sido diseñado con las siguientes características geométricas. Altura Total
50 metros
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5.3. UBICACIÓN UBICACI ÓN DE LOS DEPOSITOS DE DESMONTE DENTRO DE LA CONCESION
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5.4. CARACTERISTICAS CARACTERISTIC AS DE LOS DEPOSITOS DE DESMONTE. El proyecto ha contemplado la construcción de 3 depósitos de desmonte. Para el
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CAPITULO VI INSTALAC IONES
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JJ MITCHEL INGENIEROS S.A.C.
6.3 UBICACIÓN DE LAS INSTALACIONES PRINCIPALES.
FOREVER MINERALS S.A.C
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