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Ph. D. Eng. TADEUSZ S. GOLOSINSKI - [email protected] - Consultor Intercade

PIQUES y CHIMENEAS:Diseño, Construcción y Operación

PIQUES y CHIMENEAS:Diseño, Construcción y Operación

Ph. D., P. Eng. TADEUSZ S. GOLOSINSKI [email protected]

Consultor INTERCADEJunio 2008

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7.PIQUES DE TRASPASO(Orepasses)

7.PIQUES DE TRASPASO(Orepasses)

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Chimeneas(Piques de Traspaso)

Chimeneas(Piques de Traspaso)

Orepasses

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CONSIDERATIONSCONSIDERATIONS

• Orepass size and shape.• Wall condition: smooth or rough?• Orientation: vertical or inclined.• Material size, shape and particle distribution.• Operational mode.

– Dump when full / empty.• Moisture condition.

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HOW BIG OREPASS? HOW BIG OREPASS?

• Depends on various considerations.– See the slide above.

• Usually defined by D/d ratio.– D is pass dia, d is diameter of the largest particles.

• For ratios up to D/d < 3, problems are likely.• For ratios of D/d > 5 , problems are unlikely.• Example: EL Teniente.

– Largest rocks 1,5m; pass dia 3,5m, 1m x 1m grizzly.

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LESSARD & HADJIGEORGIU SURVEY 2007

LESSARD & HADJIGEORGIU SURVEY 2007

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Scalper (31)

Cone dump (18)

Grizzly (32)No control structure: 72

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DUMPS: BLOCK SCREENINGDUMPS: BLOCK SCREENING

• Scalper.– High maintenance costs (operator “pushing through”, broken

bars plugging the orepass).– Large slabs can get through.

• Grizzlies.– Better retain big blocks.– Grid dimensions critical (bucket & muck size<<9.

• Cone plugs.– Low maintenance costs.– Easy to plug up.

• No structure (71/153).– Screens “spread out” material thus minimize impact forces ☺.

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DRAW CONTROLSDRAW CONTROLS

• Chutes using control chains (61).• Control chains (35).• Chutes using control chains and an arc gate (21).• No control over flow (33).• Chutes using solid doors (2).• Ross feeder (1).

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Control chainswithout chute

Control chainsin a chute

Control chains andan arc gate

DRAWSDRAWS

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Length of excavated sectionsLength of excavated sections Inclination of excavated sectionsInclination of excavated sections

Minimum diameterMinimum diameter Number of finger raises per sectionNumber of finger raises per section

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LENGTHS & EXCAVATION METHODSLENGTHS & EXCAVATION METHODS

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MATERIAL HANG-UPSMATERIAL HANG-UPS

Interlocking arches Cohesive arches

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OREPASS SUPPORTOREPASS SUPPORT

• Ground conditions.• In-situ stress regime.• Mining induced

stresses.• Method of excavation.• Excavation dimensions.• Victinity of other

infrastructure.• Required transfer

capacity.• Access to install

support.• Design life.• Consequences of

failure.

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TYPES OF GROUND SUPORTTYPES OF GROUND SUPORT

• Resin grouted rebar (116).• Resin grouted rebar and cemented grouted cables (9).• Resin-grouted cables (7).• Fibreglass rebar (8).• Resinn grouted rebar and split set (1).• No support (12).

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Note

Cavingfront determinesstressconditions

El TenienteSec. 4 Sur.

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