Mobile Heavy Diesel Mechanics at Tom Price Mine.

Service Requirements at Tom Price Mine

Sustaining 28 Mtpa iron ore throughput through open pit extraction places cyclic mechanical load on haul truck drivetrains, hydraulic systems, and ancillary diesel-powered plant that routinely exceeds standard OEM service intervals. Rio Tinto / Hamersley Iron Pty Ltd operates Tom Price Mine as a continuous production asset, meaning unplanned drivetrain failures translate directly into measurable tonnes-per-hour losses against a tightly scheduled rail loading programme to Dampier and Cape Lambert. The RFQ scope must therefore distinguish between scheduled preventive maintenance delivery and unplanned breakdown response, treating each as a separately resourced capability with independent SLA obligations. The Western Turner Syncline Phase 2 expansion, approved in 2019/2020, has extended the active mining envelope and increased the number of diesel-powered assets requiring field servicing across a larger spatial footprint. Scope documentation should specify unplanned Mean Time To Repair (MTTR) for Category 1 haul truck drivetrain faults as a minimum performance threshold.

• Ambient heat-rated field capability: Demonstrated service delivery in sustained ambient temperatures of 45°C, with documented evidence of tooling specifications, fluid management protocols, and personnel heat-management procedures validated at a comparable Pilbara open pit operation — minimum 24 months of continuous site exposure within the last 5 years.
• MTTR performance evidence: Documented Mean Time To Repair of ≤4 hours for Category 1 haul truck drivetrain faults (engine, transmission, final drive), evidenced by field service logs from an equivalent iron ore or hard-rock open pit operation producing ≥10 Mtpa, submitted with tender response.
• Mobile workshop self-sufficiency: Field service units must carry a minimum 72-hour consumable inventory (oils, filters, seals, common wear components) rated for operation at 48°C peak ambient without refrigerated storage dependency, with a documented restocking protocol from Newman or Karratha within 24 hours of drawdown.

Site-Specific Operational Constraints

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

• Environment: Pilbara summer ambient sustained at 45°C, with recorded peaks to 48°C; fine hematite dust from high-grade BIF ore creates aggressive particulate contamination risk for diesel fuel systems and air filtration components — tender documentation must require dust ingress protection ratings and filter change interval schedules specific to these conditions.
• Logistics: Tom Price Mine sits approximately 1,038 km from Perth; the nearest serviceable logistics hub is Newman (~210 km via sealed road). Critical parts not held in the contractor's on-site inventory must be routed through Newman or Karratha, with road freight via Nanutarra-Munjina Road as the primary overland supply corridor. Air freight via Tom Price Airport (TPR) is available for emergency components but must be costed separately in the RFQ schedule of rates.
• Response SLA: Unplanned breakdown response: 2–4 hours on-site call-out for assets within the active pit boundary; 12–24 hours extended mobilisation for specialist components or personnel requiring FIFO rotation from Karratha. Both windows must be contractually defined with KPI-linked penalty provisions for non-compliance.
• Roster: All field mechanics must operate on FIFO rotational rosters compatible with Tom Price Airport (TPR) flight schedules from Karratha as the primary hub. Minimum standby crew of two qualified heavy diesel mechanics must be maintained on-site at all times during scheduled production windows; roster handover documentation must ensure zero gap in mechanical coverage.
• Camp/facilities: Site-provided accommodation is available within the Tom Price township and mine camp infrastructure; contractors must confirm billet requirements during prequalification. Self-sufficient mobile workshop capability is mandatory — reliance on site workshop bays for routine field servicing is not guaranteed and must not be assumed in the contractor's methodology.

Contractor Capability Checklist

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

• Technical certifications: OEM authorisation or documented service competency for the specific haul truck and ancillary diesel plant fleet in operation (e.g. Komatsu, Caterpillar, or Hitachi as applicable); compliance with AS 3788 (pressure equipment in-service inspection) where applicable to diesel-driven ancillary plant.
• Personnel tickets: All mechanics must hold a current Certificate III in Heavy Commercial Vehicle Mechanical Technology (or equivalent AQF Level 3 trade qualification) recognised under WA law; site-specific verification of competency for high-voltage proximity awareness is required given the 45MW battery energy storage infrastructure on site.
• Mobilisation SLA: Documented evidence of achieving ≤4-hour on-site response from a standby position at an equivalent Pilbara mine site, with field service logs or client references confirming compliance over a minimum 12-month continuous period.
• Public Liability insurance: Minimum AUD $20M per occurrence — Certificate of Currency required with tender response; policy must name Rio Tinto / Hamersley Iron Pty Ltd as an interested party.
• Professional Indemnity: Minimum AUD $10M aggregate — required where the contractor's scope includes technical specification of replacement components, fluid grades, or service interval recommendations that deviate from OEM schedules.
• Workers Compensation: Full statutory cover under WA law (WorkCover WA) — Injury Management Plan must be submitted; coverage must explicitly include FIFO workers operating under WA jurisdiction.
• Site exposure: Minimum 3 years of continuous field service delivery at an open pit iron ore or hard-rock mine in the Pilbara, with documented evidence of haul truck fleet sizes of ≥20 units serviced concurrently; references from a site producing ≥10 Mtpa are mandatory.
• Safety systems: Certified HSE management system to ISO 45001:2018 or equivalent; demonstrated ICAM (Incident Cause Analysis Method) investigation capability with at least two completed ICAM reports available for procurement review; current Silica and Dust Exposure Management Plan aligned to WA regulatory requirements.

Regulatory & HSE Framework

The applicable compliance framework is the Work Health and Safety Act 2020 (WA) and the Work Health and Safety (Mines) Regulations 2022 (WA), administered by WorkSafe WA. For mobile diesel mechanics operating in an open pit environment, particular obligations arise under the WHS (Mines) Regulations 2022 in relation to plant management, isolation and lockout/tagout procedures, and working in extreme heat — all of which must be addressed in the contractor's site-specific Safe Work Method Statements prior to mobilisation. Diesel particulate exposure management is a concurrent obligation under WA occupational health provisions and must be addressed in the contractor's submitted health monitoring plan. Contractor registration is required via the Rio Tinto Supplier Portal (SAP Ariba) at https://www.riotinto.com/suppliers/supplier-portals prior to RFQ participation; the Rio Tinto Buy Local Portal (https://riotintobuy.local.riotinto.com/) is the secondary registration pathway for regionally based Pilbara suppliers. All contractors must complete site-specific induction via Rio Tinto / Hamersley Iron Pty Ltd procedures before mobilisation, including mandatory training on the site's Dust and Silica Exposure Management Plan and emergency response protocols relevant to diesel plant incidents in a remote open pit setting.

Sourcing Qualified Contractors

No confirmed tender activity for this specific service at Tom Price Mine is on record at the time of this briefing — procurement teams should initiate market sounding through the Rio Tinto Supplier Portal ahead of formal RFQ release. The regional labour pool for mobile heavy diesel mechanics is centred on Newman (~210 km from site), with moderate capacity across the Pilbara; demand from concurrent iron ore operations in the West Pilbara Mineral Field means availability of experienced, immediately deployable mechanics is competitive and lead times for prequalification must be factored into the procurement programme. Contractors with confirmed regional exposure include SHIFT Diesel and Earth, Marlee Resources, and Everything Diesel (noted as market reference only — not an endorsement or recommendation). Allow a minimum of 4–6 weeks for prequalification, portal registration, and onboarding documentation to be completed before planned mobilisation dates, particularly where FIFO roster approvals and site induction scheduling are required concurrently.