18/10/2011
Fundamentos de Block/ Panel Caving un imiento por oques y paneles) Ing. Abdel Arroyo Aguilar
Introducción
Block/Panel Caving son métodos subterráneos masivos de explotación de mineral. Es el método de explotación subterráneo de menor costo (3 – 4 US$/ ton) y mayor productividad productividad (> 40.000 tpd productividad tpd/mina). /mina). Esto se debe entre otros factores a que la fragmentación del mineral/esteril mineral/ esteril no se basa en la voladura voladura sino en voladura en los esfuerzos inin-situ -situ creados por el hundimiento, ademas adem ad emas as el transporte de mineral es principalmente gravitacional. La granulometría del mineral y estéril depende de las características característica s intrínsecas del mineral y de los esfuerzos que in - -s situ i t u durante el proceso de caving actúan en el macizo in cavi ca ving ng y posterior flujo hacia puntos de extracción. hidrau hid raulic lico o bus busca ca El acondicionamiento por explosivos o hidraulico mejorar la fragmentación del mineral mas competente.
1
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18/10/2011
Block and panel caving
Block caving – – Método de explotación masivo
casos representando el area basal basal del del cuerpo cuerpo mineralizado se corta en su base y luego a partir de la extracción se produce la propagación del hundimiento Pane Pa nell ca cavi vin n – e ess u una na fforma orma d del el m método étodo d de e hundimiento en que bloques consecutivos se hunden en forma continua de modo de evitar la dilución latera y los esfuerzos de relajación producidos en el método convencional de block caving.. caving
Preparación base block block caving . 2. 3. 4. 5. 6. 7. 8. 9.
-
-
adit vent adit ventila ventilación ilación ción Accesos a niveles: producciónproducción- hundimientohundi hun dimi mien ento to- ventilaciónventil ven tilaci ación ónreducción secundaria Construcción nivel producción: calles estocadas y zanjas Construcción nivel hundimiento: calles, galerias Construcción nivel ventilación ons rucc n n ve ranspor e re ucc n secun ar a Chimeneas de traspaso Chimenea slot Hundimiento y producción
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18/10/2011
Definiciones – – niveles minas explotadas por hundimiento
Nivel de reducción secundaria secundaria
Es el nivel donde se reduce el tamaño de mineral mediante mart ma rtilillo loss ic icad ador ores es- este nivel uede ir en una cota distinta al esde producción (El TenienteTeniente- Sub6) en el el nivel (Esmeralda(Esmeralda (Esmera lda- El Teniente), en el nivel directo a chancador chancador (Pipa NorteNorte- Di Diab Diablo ablo lo Regimiento-- El Teniente). Regimiento Teniente Tenie nte). ).
Nivel de aca acarreo rreo
Es el nivel donde se realiza el carguío y posterior transporte de mineral proveniente del nivel de producción. Carguío es ( trenes o camiones)
Nivel de tr ansporte
Es el nivel donde se realiza el carguío y posterior transporte de mineral proveniente del nivel de acarreo. Carguío es mecanizado y automatizado (buzones) asi como el transporte transporte transport e ( trenes o camiones)
Level 7210 ore bin layout, Henderson Mine, USA (Keskimaki et al 2004)
675 Tonne cap, Storage bin
Ore pass & Exhaust raise
Loading chute
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18/10/2011
Sistema Minero de Block Cave
General vertical section, Henderson Mine, USA (Keskimaki et al 2004)
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18/10/2011
Extraction level layout, Northparkes E26 Lift 1, Australia
7.9
Extraction level layout, Lift 2, Northparkes E26 Mine, Australia (Flores & Karzulovic 2002)
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18/10/2011
Extraction level layout, Palabora Mine, South Africa
7.11
Inca Central Oeste Mina El Salvador
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18/10/2011
Block caving Block
Desc De scri ri pción del Mét odo
En est est e mét odo el min eral es fr actur ado por si , int ernos, se requier e mínim a perf perf oración y
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18/10/2011
Caracteristicas del Método Método
Utilizado por las minas subterráneas más grandes del mundo Alta producción: 5,000 to 45,000 tpd
El menor costo de producción por tonelada
Excelente productividad por persona y equipos
Se puede automatizar
Se requiere de una fuerza de trabajo con conocimiento de las labores subterráneas
Ventajas
método de minado económico requiere de poca perforación, voladura, y poco sostenimiento. Permite una alta producción.
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18/10/2011
Block Caving con hundimiento hundimiento convencional
Nivel hundimiento Nivel producción
Block Caving en Mina Palabora, South Africa (Moss, 2007)
Método Block Block Caving Caving E Extracción xt racc racción ión Gravit ac acional ional :
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18/10/2011
Cuerpos masivos con una proyección en planta suficiente para inducir el hundimiento de la roca La roca mineralizada a hundir debe ser medianamente competente La roca estéril de techo debe ser La roca de caja puede ser competente Se induce el hundimiento de la roca a través del corte basal 44--12 -12 m. El hundimiento se propaga en la medida que la roca es extraída del hundimiento utilizando la infraestructura de producción Fine material complete gravity flow Highly productive 0.75 t/m2/día t/m2/día,, lower operations cost 2.5 $/t high capital cost 1500 $/m2 Productividad 12000 a 48000 tpd Dilución 20% Recuperación 75% Costo 2.12.1-5$/t -5$/t
Block Caving
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18/10/2011
Panel Caving
Existe interfase interf int erfase ase min minera mineral erall estéril parte de la vida de la mina Se desarrolla para poder tener un mejor control de la dilución horizontal Coarse rock, equipment can handle different volumes Productivity 0.55 t/m2/día t/m2/día,, Operation cost 3.5 $/t Capital cost 700$/m2
Existe una gran zanja como en el
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18/10/2011
Método Mét odo Panel Panel C Cavin avin aving g (Bloc (Block k Caving Caving E Extracción xt racc racción ión Mecanizada (LHD))
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18/10/2011
Why is Block Caving relevant? Bingham Canyon Henderson
IVANHOE
Philex_Padcal Freeport_DOZ
De Beers- Beers - Finsch
Chuquicamata El Salvador
De Beers- Beers - Premier
RTZ_Argyle
RTZ_Palabora
Andina El Teniente
New Mines Mines in operations 2003
RTZ_Northparkes
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18/10/2011
Evoluc Evo Evolución lución ión de la producción produc pro ducció ción n de minas minas subterraneas que ap que aplilica can n BC 160000
g f n o i n g i n m i d n r e u d o o F M . R m s f i S o c I n e a c h n c e e g r e m o m e E g
120000
Y A D R100000 E P S E 80000 N N O T 60000
t e c e g d j e l r n o l u p o o C r s l g o r a i i e t r a e d v p n u a m c I x e
l y a d n u o t i S t a g n i n r e v t n a I C
Bingham Canyon San Manuel Climax
40000
Kiruna
20000
Miami Mount Isa
0 1880
El Teniente
1900
1920
1940
Malmberget Premier Kidd Creek Salvador
1960 1980 YEAR
Henderson Andina Olympic Dam Palabora Freeport IOZ/DOZ Ridgeway
2000
2020 Brown (2004)
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18/10/2011
Unidad básica de explotación
Nivel hundimiento (UCL) calle Estocada/ punto de extracción
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18/10/2011
Aspectos Críticos de Minería de Block Caving Propagación Fragmentación/ Flujo Esfuerzos
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18/10/2011
Aspectos Críticos de Minería de Block Caving Propagación Fragmentación/ Flujo Esfuerzos
•Kvapli & Jenike 196
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18/10/2011
Modelo Conceptual Ore Body Cavability
Stresses
Fragmentation
Undercut De Design
Layout De Design
Mining Sequence
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18/10/2011
Caracterización Geotécnica Karzulovic 2003a)
(Flores &
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18/10/2011
Caracterización Geotécnica
(Flores & Karzulovic 2003a)
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18/10/2011
Hundibilidad A menudo mide en forma cualitativa si un cuer o hundirá o no en ue forma lo hará Parámetros interesantes son los siguientes:
Hundirá?
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18/10/2011
Modelo Idealizado de Inducción de Hundimiento
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18/10/2011
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18/10/2011
Layout Ideal en un block/panel caving (Richardson 1981)
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18/10/2011
Gráfico de Hundibilidad de Laubscher – – El
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18/10/2011
Medición de Hundibilidad a partir de TDRs
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