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An Engineering Challenge

Building Hauls Roads for These Ultra Class Dump Trucks

with GVW 600t

Location : Bowen Basin Queensland, Australia

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Liebherr weighs the same as A380 Jumbo

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Purpose of Presentation is “Information Sharing Only” and opinions

shared are of the author only

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Liebherr T282B

Gross Vehicle Weight (GVW): 600 ton

Payload Class: 363 ton

Empty Vehicle Weight (EVW): 237 ton

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What does the project involve

Mine Upgrade 2012 involves the introduction of additional fleets:

2 x Liebherr R9800 excavators (800t)

12 x Liebherr T282B dump trucks

Construction of 12km of new hauls for T282B fleet

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What does the project involve ?

Mine Upgrade 2012 involves the introduction of additional fleets:

2 x Liebherr R9800 excavators (800t)

12 x Liebherr T282B dump trucks

Construction of 12km of new hauls for T282B fleet

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Existing hauls roads

constructed from

overburden,

not weather proof

Roads will not

sustain T282 loads

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Process for tackling this Project July 2012 start

Principal & Main Contractor Sign New Mining Operations Contract

Scope of Works for Construction of New Hauls Completed

Appointment of Specialised Consultants (Pells Sullivan Meynink

Geotechnical Engineers)

Source Rock Assessment (On-Site Sandstone)

Source Rock Assessment (External Quarry Sites)

Review Past Learning from other Mining Projects in QLD and NSW

Review Technical Papers by Robert Thompson and others

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T282B vehicle Dimensions Width = 9.69m

Haul Road Width = 40m

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w Pad set up with sandstone that hs been used to build 800t excavator and withstood heavy

loading

Mechanical Team on were going to get site assessed by Geotechnical as a 250T crawler crane was going to operate on this hardstand for plant build of LiebherrR9800 800t excavator and T282B dump truck builds

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wPMS site investigation confirmed a large variability in sandstone rock geotechnical properties

Thorough and carefully material selection would be very important

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Potential sandstone source for suitable material for mobile crushing plant n site however large mudstone deposit also present within source

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wChallenge on site was to work on Change Management and work with Mining Team to : build and assign correct resources and equipment to construct haul route with appropriate material rather overburden which is unsatisfactory in wet weather

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PM

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nSite Sandstone Rock

Variability

Red = Stop: Siltstone / Mudstone

(not suitable for road construction

Amber = Caution: Sandstone with

excessive quantity of siltstone

Green = Go : Sandstone with

suitable properties CBR 30 - 45

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Adrian Smith’s from PSM Site inspection :

Some potential to utilise some sound sandstone material on site

Carefully mining will need to take place to only utilise certain sandstone

sources for feed to on site crushing and screen plant

Multiple samples take as per Thiess request for Laboratory Testing

Thiess and PMS to work together on optimising the pavement design based on

sandstone material on site

Dave Tulloch from Road Safety Training Services completed assessment on site on Mine Road Friction Resistance

Challenge was for Mining Management Team to incorporate these initiatives and recommendations

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wDave Tulloch from Road Safety Training Services completed assessment on

site on Friction Evaluation and Operational Protocol

Challenge was for Mining Management Team to incorporate these recommendation

Construction of new haul roads would include recommendation from report

Challenge for site teams to “change mindset” and learn to use Vericomsystem and adopt system of measuring and friction testing on haul routes rather than using Open Cut Examiners judgement on safety of haul roads post wet weather

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Site Sandstone Rock Variability

Sandstone with suitable

properties CBR 30 – 45

However variability was

evident in test results

PMS report provided guidance

on variability

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thank you for your time