Mobile Heavy Diesel Mechanics at Silvergrass Mine

Site Logistics & Equipment Requirements

At a Glance

Operator

Rio Tinto / Hamersley Iron Pty. Limited

Commodity

Iron Ore

Region

Pilbara — West Pilbara Mineral Field

Distance from Perth

1,080 km

Nearest hub

Newman (~274 km)

Stage

Operating

Ambient peak

48°C (sustained 45°C+)

Typical SLA

Emergency breakdown 2-4h / Extended mobilisation 12-24h

Roster

2/1 FIFO (typical)

Supplier portal

Avetta + Rio Tinto Supplier Portal

Insurance min

AUD $20M PL / $10M PI

Service Requirements at Silvergrass Mine

Sustaining 21 Mtpa iron ore throughput at Silvergrass Mine places cyclic, high-intensity load on haul truck drivetrains, ancillary plant, and crusher feed equipment that routinely exceeds standard OEM service intervals. The open pit extraction of Marra Mamba hematite — fed via a 9 km overland conveyor to the Nammuldi processing facility — means unplanned drivetrain failures cascade rapidly into conveyor feed disruptions and rail-spur loading delays, making diesel mechanic response time a direct throughput variable, not a secondary maintenance metric. Rio Tinto / Hamersley Iron Pty. Limited operates this site under a continuous production model; RFQ scope must therefore address both scheduled preventive maintenance windows and unplanned breakdown response as distinct, separately priced service streams. Scope documentation should specify maximum mean time to repair (MTTR) for Category 1 drivetrain failures as a minimum performance threshold.

• Ambient temperature competency: Demonstrated delivery of heavy diesel maintenance in sustained ambient conditions of 45°C, with documented protocols for equipment derating and technician heat management at peaks to 48°C — minimum 24 months of verified site exposure within the last 5 years at a Pilbara or equivalent arid open-pit operation.
• MTTR performance evidence: Documented mean time to repair ≤4 hours for Category 1 drivetrain failures (haul truck engine, transmission, or final drive) drawn from a comparable iron ore or bulk-commodity open-pit operation, submitted as verifiable KPI records with tender response.
• Fleet coverage breadth: Demonstrated OEM-authorised or OEM-endorsed capability across a minimum of two heavy haul truck platforms (e.g. Caterpillar 793/797 series or Komatsu 830E/930E series) and one ancillary plant category (crusher, conveyor drive, or dozer) relevant to open-cut iron ore operations.

Site-Specific Operational Constraints

Conditions procurement must communicate to all bidders in tender documentation for Silvergrass Mine.

• Environment: Pilbara desert conditions with sustained summer ambient of 45°C and recorded peaks to 48°C impose mandatory heat-load derating on diesel engines and hydraulic systems; dust ingestion from Marra Mamba ore handling accelerates filter and injector wear cycles. All maintenance schedules submitted at tender must account for these compressed service intervals explicitly.
• Logistics: Silvergrass Mine sits approximately 1,080 km from Perth, with the nearest significant service hub at Newman (~274 km via sealed and unsealed haul corridors). Contractors must demonstrate pre-positioned consumable stock — filters, injectors, belts, and critical drivetrain components — at Newman or closer, with documented replenishment lead times. Reliance on Perth-sourced parts for breakdown response is not acceptable under the required SLA structure.
• Response SLA: Emergency call-out response (technician on-site, tools and parts available) must be achieved within 2–4 hours for Category 1 drivetrain failures. Extended mobilisation for specialist sub-assemblies or OEM field engineers must be completed within 12–24 hours. Both windows must be supported by documented MTTR evidence from equivalent Pilbara operations and are subject to KPI-linked penalty provisions in the contract.
• Roster: FIFO mobilisation via Paraburdoo or Tom Price regional airports is the standard access mode; contractors must confirm FIFO-compatible roster structures (minimum 8/6 or 14/7 patterns) and maintain a standby crew designation capable of activating within the 2–4 hour call-out window without roster gap exposure.
• Camp/facilities: Site-provided accommodation and messing arrangements apply for FIFO personnel; contractors must confirm self-sufficiency in tooling, diagnostic equipment, and personal PPE. No assumption of site-supplied specialist tooling is permissible — all OEM-specific diagnostic hardware must be contractor-furnished and listed in the mobilisation schedule.

Contractor Capability Checklist

Minimum evaluation criteria for shortlisting Mobile Heavy Diesel Mechanics contractors at Silvergrass Mine. Each criterion must be verifiable via documentation submitted with tender response.

• Technical certifications: OEM authorisation or documented OEM-endorsed service capability for heavy haul truck platforms deployed at site; AS 2790 (earthmoving machinery) compliance where applicable; MARCSTA site safety card or equivalent Pilbara site-access credential for all deployed personnel.
• Personnel tickets: Certificate III in Mobile Plant Technology (Heavy Diesel) or equivalent WA-recognised trade qualification; WA Driver's Licence (minimum Class C, HR preferred for site vehicle operation); confined space and working-at-heights competencies current within 2 years.
• Mobilisation SLA: Documented evidence of ≤4-hour Category 1 call-out response from a Pilbara or equivalent remote open-pit operation, including logistics plan showing pre-positioned parts inventory at Newman or equivalent forward location.
• Public Liability insurance: Minimum AUD $20M per occurrence (Certificate of Currency required with tender submission).
• Professional Indemnity: Minimum AUD $10M aggregate — mandatory where contractor scope includes technical specification of repair methodology, component substitution advice, or maintenance interval recommendations deviating from OEM schedules.
• Workers Compensation: Full statutory cover under WA law (WorkCover WA — Injury Management Plan required and must be submitted with prequalification documentation).
• Site exposure: Minimum 3 years of continuous or aggregate heavy diesel maintenance at an operating open-cut iron ore mine; Pilbara exposure preferred; Marra Mamba or Brockman formation site experience to be declared and weighted in evaluation scoring.
• Safety systems: Documented HSE management system certified to ISO 45001 or equivalent; demonstrated ICAM (Incident Cause Analysis Method) investigation capability with at least one completed ICAM report available for audit; fatigue management plan aligned to FIFO roster patterns.

Regulatory & HSE Framework

All mobile heavy diesel maintenance activities at Silvergrass Mine are governed by the Work Health and Safety Act 2020 (WA) and the Work Health and Safety (Mines) Regulations 2022 (WA), administered by WorkSafe WA. Contractor obligations under this framework include hazard identification specific to diesel engine maintenance in high-ambient environments — including heat-related illness risk at 45°C sustained and 48°C peak conditions, hydrocarbon exposure management, and pressurised system isolation protocols consistent with mine-site energy isolation standards. Supplier registration and prequalification are managed through the Avetta platform integrated with the Rio Tinto Supplier Portal (https://www.riotinto.com/en/suppliers); portal registration is mandatory prior to RFQ participation. All contractors must complete site-specific induction under Rio Tinto / Hamersley Iron Pty. Limited procedures before any personnel mobilise to site, with no exceptions for experienced or previously inducted personnel unless currency of induction is confirmed in writing by site management.

Sourcing Qualified Contractors

The regional labour pool for Mobile Heavy Diesel Mechanics capable of servicing Pilbara iron ore operations is constrained, with approximately 3–5 active providers holding the combination of Pilbara site exposure, FIFO-ready rosters, and pre-positioned parts infrastructure that Silvergrass Mine's response SLA demands. Newman (~274 km from site) functions as the primary forward-logistics hub for this service category; contractors without an established Newman or West Pilbara presence will face structural disadvantage in meeting the 2–4 hour call-out requirement and must demonstrate a credible alternative pre-positioning plan to be considered. Contractors with confirmed regional exposure include SHIFT Diesel and Earth, Everything Diesel, and Marlee Resources (noted as market reference only, not endorsement). Procurement teams engaging this market must allow a minimum of 6–8 weeks for prequalification, Avetta registration, and site induction scheduling before first mobilisation can be confirmed — compressing this timeline risks non-compliant contractor activation under the WHS (Mines) Regulations 2022 (WA). RFQ documentation should weight pre-positioned inventory evidence and documented MTTR records from comparable operations as primary differentiators, given the shallow regional pool and the direct throughput consequence of diesel mechanic response failure at this production scale.