UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
DEDICATÓRIA
Este Este trab trabaj ajo o está está dedi dedica cado do a nues nuestr tros os padres quienes nos guían en el camino que vamos pisando una y otra vez, y al hacerlo nos esmeramos en dejar huellas bien formadas con el ejemplo que nos dieron.
EXPLOTACIÓN SUBTERRANEA
1
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
INTRODUCCIÓN La tecnología de explotacin empleada en las minas subterráneas del !er", es fruto de una paciente investigacin de los m#todos de explotacin que se aplica a la peque$a, mediana y gran minería. m inería. El m#todo de explotacin es la estrategia global que permite la excavacin y extraccin de un cuerpo mineralizado del modo t#cnico y econmico más eficiente% &
'efine los principios generales seg"n los que se ejecutan las
operaciones unitarias. &
'efine criterios con respecto al tratamiento de las cavidades que deja
la extraccin. En este trabajo hablaremos acerca del minado por almacenamiento provisional ()*+ ()*+-/ /0E 0E 1E2/1E2/-3 3/' /'45 4566 el cual cual está está dent dentro ro de los los
m#to m#todo dos s de
explotacin con sostenimiento artificial en el cual se incluye el almacenamiento prov provisi ision onal al lo cual cual se utili utiliza za en cuer cuerpo pos s mine minera raliz lizad ados os con con buza buzami mien ento tos s pron pronun unci ciado ados, s, mine minera rale les s resi resist sten ente tes s y roca rocas s comp compet eten ente tes s para para un auto auto soporte.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
OBJETIVOS •
2onocer la forma y manera de extraccin subterránea a trav#s del m#todo de shrin7age mecanizado, las t#cnicas y los costos que conlleva eficientemente.
•
Eleg Elegir ir de mane manera ra corre correct cta a el m#to m#todo do a utili utiliza zarr para para la expl explot otac aci in n tomando en cuenta criterios, consideraciones, características y factores que influyen en el cuerpo mineralizado.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
MÉTODO DE EXPLOTACIÓN SUBTERRANEA “SHRINKAGE MECANIZADO” .
2+8E+ 2+8E+4) 4) !/ !/+/ L/ )ELE22 )ELE2299- 'EL 'EL 1E84'4 1E84'4 'E E:!L E:!L48 48/ /29-% 29-% En consideracin a estos factores, se debe tomar una decisin respecto a si explotar el cuerpo m i n e r a l i z a d o m# to dos de explotacin de
explotacin
subterráneos.
mediante
de s u p e r f i c i e o m # t o d o s Las
características
espaciales
;geometría ;geometría del cuerpo< cuerpo< y la competencia de la roca son esenciales dado que pueden determinar la conveniencia de utilizar un m#todo por sobre otros. Estos criterios pueden ser% •
2aracterísticas espaciales
•
2ondiciones geolgicas e hidrolgicas
•
2onsideraciones geot#cnicas y econmicas.
•
=actores tecnolgicos.
•
=actores medioambientales.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
. 1>84'4) 'E E:!L48/29)?@8E++/-E/ )E0A- +ELLE-4 %
.
1E84'4 1E84'4) ) 'E 'E E:!L E:!L48 48/ /2929- )?@8 )?@8E++ E++/-E /-E/ / )E0A)E0A- )4!4+8 )4!4+8E% E%
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
B. B.
24-' 24 -'2 24 4-E -E) ) !/+/ L/ /!L /!L2/ 2/2 299- 'EL 'EL 1E84 1E84'4 '4 )*+ )*+- -/0 /0E E 1E2/-3/'4 ;)84!-0<%
El shrin7age shrin7age mecanizad mecanizado o es un m#todo m#todo de explotaci explotacin n vertical vertical aplicable a vetas ;estructura ;estructuras s verticales<. En su esencia, consiste en utilizar el mineral quebrado como piso de trabajo para seguir explotando de manera ascendente. Este mineral provee además soporte adicional de las paredes hasta que el casern se completa y queda listo para el vaciado. Los caserones se explotan ascendentemente en tajadas horizontales, sacando solamente el CD F GH que se esponja y dejando hasta el momento del vaciado el resto. El m#todo de corte y reduccin o shrin7age, se está utilizando en vetas de las siguientes características%
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS •
@uzamiento mayor de IHJ, dando lugar a que la carga de las
•
cajas no se cuelguen. 'ebe tener rumbo y potencia uniforme a K a CHm. El cuerpo mineralizado debe ser regular en cuanto a su forma,
•
• • • •
caso contrario presenta gran dilucin. +egular presin de las cajas. 1ineral no aglomerable ;arcilla< ni inflamable i nflamable poco oxidable. 1ineral firme. El mineral debe tener ley uniforme.
SHRINKAGE MECANIZADO EN LA MINA SAN RAFAEL DE MINSUR S.A. La mina )an +afael de 1-)?+ )./ ha venido utilizando el m#todo de ()*+-/0E (. 'esde KC ha cambiado su m#todo de explotacin a ()?@F LEBEL )84!-05 con taladros largos, incorporando para sus operaciones unitarias equipos como los ('oMn the hole5 ;'8*<. La minería continuamente viene evolucionando en funcin de los avances de la tecnología debido a que constantemente se investiga y se dise$a nuevos m#todos de minado de mayor eficiencia, m enor costo, mejor produccin y productividad.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
Latitud sur
*asta
la
fecha
KGJKGN
en
su
desarrollo
han
intervenido
muchas
compa$ías compa$ías extranjeras extranjeras y nacionales nacionales,, siendo siendo hoy la propietaria propietaria 1-)?+ )./.
CARACTERISTICAS GEOLÓGICAS DEL YACIMIENTO:
La mineralizacin es de origen hidrotermal epigen#tico constituidas por vetas de relleno de fracturas fracturas y reemplazamie reemplazamiento nto de brechas brechas pre existentes, reemplazadas de
en
menore menoress dimens dimension iones es
intrusivo
de
dimensiones
batolíticas
y volcá volcánic nicas as con edades edades que varían varían del
jurásico al terciario. La potencia varía desde H.O m hasta varios metros, con buzamiento buzamiento de PHJF ODJ -E y abarca una extensin mineralizada de C.G 7m. Las rocas que formas el distrito minero son pizarras y cuarcitas del grupo /mbo. La actividad ígnea esta representado por intrusiones acidas, emplazadas cerca de la superficie prfido monzoniticocuarzifero y
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
m7ine m7inerale raless de ganga ganga el cuarzo, cuarzo, clorita, clorita, arseno arsenopir pirita, ita, pirita pirita fluori fluorita, ta, y marcasita. La ley promedio de de esta$o es C y de cobre cobre K. GEOLOGIA GENERAL:
La mineralizacin de la 1ina )an +afael es de origen hidrotermal, esta es vetas tipo relleno de fracturas y de reemplazamiento en los intrusivos y en el grupo /mbo.
ZONEAMIENTO Y PARAGENESIS %
En la veta )an +afael hay un marcado zoneamiento vertical, cobre en la parte superior% C de cobre y H.D de esta$o en la parte superior mas Q de esta$o y H.D de cobre6 cobre6 la textura de la mineralizacin dentro de la veta se presenta bandeada, masiva, diseminada y brechada esta ultima englobando varios minerales pre existentes, incluye a la casiterita lo que indica varias etapas de mineralizacin. CUERPO DE MINERAL:
La mineralizacin de cobre y esta$o es en forma de veta en rosario y está
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
PREPARACIÓN Y DESARROLLO:
!ara !ara la aplica aplicaci cin n del m#todo m#todo shrin7 shrin7age age mecani mecanizad zado, o, se desarr desarroll ollaro aron n niveles espaciados de GH metros verticalmente, comunicados a la rampa principal de acceso -BEL DQC con una gradiente de KH y una seccin de G x G.D metros. metros. ?na vez alcanzado alcanzado el deposito deposito mineralizado mineralizado,, se procede a delimitar
la estructura mediante galerías, dichas galerías se
desarr desarroll ollan an parale paralelam lament ente e al rumbo rumbo de la estruc estructur tura a minera mineraliz lizada ada,, a diferencia de estos dise$os Rpara la extraccin, en este caso, en el nivel inferior se desarrollan dos labores, una de ellas la galería a lo largo de la veta delimitada el tama$o del tajeo, paralela a esta se desarrolla una labor denominad denominada a (@S !/))5 que sirve para la extraccin extraccin del mineral, estas labores están comunicadas mediante mediante cruceros espaciados cada KH metros con una seccin de C x C metros para el ingreso del equipo de carguío. 8ambi#n se desarrollaron las chimeneas para la ventilacin y otras labores para el echadero de mineral en otros niveles6 ni veles6 las cuales se desarrollaron con equipos equipos (+/)E @4+-05 con un diámetro de G pies. METODOS DE EXPLOTACION%
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
perforacin tipo ?!!E+ '+LL ;perforacin hacia arriba< y además este mineral sirve de soporte para las paredes del tajeo. APLICACIONES%
Este m#todo se aplica a depsitos de mineral que tengan las siguientes características% ¬
El yacimiento mineral es firme y competente.
¬
Las cajas son relativamente estables y
¬
El minera minerall es bastan bastante te homog# homog#neo neo en conce concentra ntraci cin n y
competentes.
leyes6 la veta persiste en continuidad. ¬
Betas de alto buzamiento, mayor que el /ngulo de reposo del material fragmentado.
¬
El almacenamiento del mineral no es afectado por minerales de sulfuros que pueden oxidarse oxidarse y descomponerse. descomponerse.
PRODUCCION: •
P!"#!$%&'(: La del primer corte se va realizar con jumbo a
lo largo largo y ancho de la veta que se desplaza galería, galería,
los
taladros taladros
son
ligerament ligeramente e
sobre la inclinados, inclinados,
posteriormente se contin"a con los demás cortes sobre el
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SOSTENIMIENTO%
Las cajas y el mineral son competentes, no requieren sostenimiento en las
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS •
KUF)e corre una galería sobre mineral en el fondo de bloque.
•
QUF)e corre otra galería en mineral en la cima del bloque.
•
CUF)e construyen chimeneas en los extremos del bloc7 ;los cuales se desarrollan con (+/)E @4+-05<.
•
GUF)e construye una galería principal de extraccin en la caja piso, paralela a la galería sobre mineral denominada @S !/)).
•
DUF)e construyen cruceros ;'+/V !4-8)< desde el nivel de extraccin hacia la galería de mineral a intervalos de Pm a Om en sesgo ;KHm de una seccin de CxCm<.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
El shrin7age stopingF mecanizado es un m#todo de explotacin vertical apli apliccable able a
vetas etas ;est ;estru ruct ctur uras as vert vertic ical ales es<, <,
prin princi cipa palm lmen ente te
para para
explotaciones menores. En su esencia, consiste en utilizar el mineral quebra quebrado do como como piso piso de trabaj trabajo o para para seguir seguir explot explotand ando o de manera manera ascend ascendent ente. e. Este Este minera minerall prove provee e además además sopor soporte te adici adiciona onall de las paredes hasta que el casern se completa y queda listo para el vaciado. Las características del m#todo son% • !arte del mineral volado permanece en la cámara constituyendo el piso de trabajo del personal para realizar perforacin y voladura en la rebanada siguiente, hasta que se alcance el nivel del pilar de la
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS •
)e utiliza como sostenimiento el propio mineral arrancado, que se deja deja en la cáma cámara ra,, a esto esto debe debe su nomb nombre re;a ;alm lmac acen enam amie ient nto o
•
provisional< El mineral se arranca a lo largo de la cámara por rebanadas en realces sucesivos de Q a C.Dm de altura, y con barrenos horizontales
•
o verticales de C a Gm de largo. El ciclo de explotacin consiste en perforar, cargar, volar, y bulonar, acom acompa pa$a $ado do de una una extr extrac acci cin n parc parcia iall peri perid dic ica a de mine minera rall
•
arrancado. /l momento de vaciar el mineral almacenado adicional;CDFGH<, se debe calcular la cantidad exacta de mineral arrancado, puesto que si
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS •
8ambien se utiliza bulones;sostenimiento con pernos< para zonas d#biles d#biles de los hastiales, hastiales, con el fin que no se desprendan desprendan trozos de
•
roca y ensucien;diluyan< el mineral ?na vez que llegado al pilar de la corona superior, se descarga todo el mineral almacenado hasta vaciar la cámara, los costados bajo el
•
pilar de la corona pueden bulonarce para aumentar la estabilidad. !ara evitar el exceso de polvo en los cargadores de mineral antes de vaciar la cámara, se instalan riegos de agua pulverizada.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
La tronadura se realiza utilizando /-=4, geles ;hidrogeles<, slurry ;emulsiones< y con iniciacin no el#ctrica normalmente.
MANEJO DE MINERAL: El sistema tradicional o más antiguo consiste en el carguío directo del esponjamiento por el nivel de extraccin mediante de peque$os carros de ferrocarril, mediante buzones instalados en la base de los embudos recolectores.
Es necesario nivelar el piso para seguir perforando despu#s de cada tronada, dentro del casern, para lo que se pueden utilizar slushers,
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
El aire viciado se extrae hacia el nivel superior por la chimenea emplazada en el otro pilar correspondiente al casern vecino.
FORTIFICACIÓN: 'ependie 'ependiendo ndo de la estabilidad estabilidad de la roca encajadora encajadora,, se recurre normalmente a un
do parcial o sistemático de las paredes del
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
PRODUCTIVIDAD Y COSTOS DE METODO SHRINKAGE MECANIZADO
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
. El )hri )hrin7 n7ag age e es el m#to m#todo do más más conf confia iabl ble e en cuan cuanto to a disponibilidad de mineral roto se refiere, porque no depende de equipo de limpieza como Minchas, cavos o scoopRs. KH. KH. El )hri )hrin7 n7ag age e no depe depend nde e de rell rellen eno o hidrá hidrául ulic ico, o, por por lo tant tanto o no depende de la disponibilidad de relleno para contar con mineral roto. KK. 2uan 2uando do exis existe ten n miner mineral ales es de dist distin inta ta cali calida dad d en los
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
. 2uan 2uando do las las cajas ajas se hund hunden en ante antess de lo prev previs isto to,, se pier pierde de demasiado mineral.
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UNIVERSIDAD NACIONAL DANIEL ALCIDES CARRIÓN FACULT ACULTAD DE INGENIERÍA INGE NIERÍA DE MINAS M INAS
BIBLIOGRAF-A o
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