Antamina’s 45-strong Caterpillar 400 t truck fleet: haulage design notes for engineers
Reviewed by Tom Sullivan
First reported on International Mining – News
30 Second Briefing
Antamina has expanded its fleet of 400 t class Caterpillar 798 ultraclass haul trucks to 45 units at its open-pit operation in the Áncash region of Peru, situated at around 4,300 m elevation. The miner has acquired 27 new 798s from dealer Ferreyros, adding to 18 existing units already in production. Operating a large, standardised 400 t fleet at high altitude will influence haul road design, pit ramp geometry, and maintenance planning for engines and braking systems under reduced oxygen conditions.
Technical Brief
- High-altitude operation at ~4,300 m requires derating of diesel engines and adapted maintenance intervals.
- Reduced air density at this elevation affects retarding performance, demanding careful brake and cooling management.
- Larger ultraclass units concentrate traffic, influencing haul road wear patterns and granular base thickness requirements.
- Standardising on a single 400 t truck model simplifies critical spares inventory and component rebuild planning.
- Fleet expansion of this scale typically drives upgrades to in-pit shovel capacity and crusher feed handling.
Our Take
Antamina’s move to a 45-unit fleet of 400‑t Cat 798s in Áncash follows its earlier adoption of the Komatsu P&H 4800XPC shovel at the same copper‑zinc operation, signalling a deliberate strategy to pair ultraclass haulage with ultra‑large loading tools for higher bench productivity.
Ferreyros’ role in supplying 27 of these ultraclass trucks aligns with its recent deployments of Cat AI Assistant and underground autonomy in Peru, suggesting Antamina will likely be a priority candidate for advanced telematics, fleet health and autonomy‑ready configurations on the 798 fleet.
Caterpillar’s presence in our mining coverage now spans both Antamina’s Peruvian expansion and Glencore’s large truck order with Finning in South America, indicating the OEM is consolidating its position in high‑tonnage copper corridors where haulage efficiency and OEM support are increasingly critical to cost control.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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