Christian Frenzel Herrenknecht

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The Shaft Boring System for deep shafts.

Christian Frenzel

Santiago de Chile, April 16th, 2010

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Rio Tinto – Mine of the FutureTM

Program unveiled in Jan. 2008

Create next generation technologies

Block Cave Mining Method -Resolution Copper and Oyu Tolgoi

Significant underground infrastructure prior to ore production.

Aim - improve safety and speed of constructing underground

infrastructure (shafts and tunnels).

Civil tunnelling industry partners, contractors, and Rio Tinto

Herrenknecht is our partner in shaft construction

We are pleased to have this opportunity to present this

breakthrough to the mining community

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HERRENKNECHT AG.

3,700 Employees Worldwide

Schwanau, Germany

Guangzhou, China

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Product Range.

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Accessing Deep Ore Bodies: Requirements.

Vertical shafts (ventilation and production)

Inner diameter: 10-12 m

Depth: up to 2000 m

Geology: hard rock

Conventional ground support

Increased safety

Increased shaft construction rate

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New Shaft Boring System for Deep Shafts in Rock.

Approach for new concept

Team approach Rio Tinto – shaft contractor

Use of existing technologies wherever possible

Best possible access to bench area

Full set of rock support options

Possibility for pre-excavation grouting

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Existing Shaft Boring System for Shallow Shafts in Soils And Soft

Rock.

Dredging type submerged

operation, partial face excavation

Hydraulic muck transport

Precast segmental lining

70 – 100m depth

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Key Element for Mechanized Shaft Sinking

→ Rock Excavation And Muck Removal

Disc cutters for partial

face rock excavation

Muck removal by buckets

and muck chutes

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Rock Excavation And Mucking Process.

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Shaft Boring System (SBS).

Cutterhead (1)

Dust shield (2)

Rock bolters (3)

Gripper system (4)

Vertical conveyor (5)

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Mining Cycle.

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SBS: Cross Section.

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SBS Mucking System.

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Health Safety: Workplaces.

S1: Below dust shield

Permanent: none

Only occasional activities

S2: Main beam area

Permanent: rock bolting

Occasional: cutter changing

S3: Infrastructure platforms

Permanent: SBS operator

SBS infrastructure

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Summary

Rio Tinto and Herrenknecht partnership for Shaft Boring System

development

Concept development finished, detail engineering started

Test site to be fixed in the near future