According to GlobalData, the total number of underground mining trucks and loaders, haulers and dumpers in underground mines last year, including both active and those in care and maintenance, was estimated at 23,514 of which 20,085 were at active mines.
The scale of these fleets highlights the importance of reliability. When a major component fails, the consequences extend beyond repair costs. Downtime affects production schedules, maintenance teams and ultimately the economics of the mine itself.
As such, operators are paying closer attention to factors that influence machine health. One of the most important is lubrication. Lubricants protect critical components from friction, heat and wear and their performance can determine how long machinery operates between service intervals and how well components withstand sustained mechanical stress.
Electric wheel motor systems provide a clear example. These assemblies are at the centre of haul truck drivetrains and must operate under high torque and extreme temperature conditions. Protecting them requires lubricants that maintain film strength, resist degradation and perform consistently under load.
“Modern mining fleets operate under extreme temperatures, heavier loads and tighter tolerances, placing greater importance on effective lubrication,” says Gord Susinski, senior advisor for technical services at Petro-Canada Lubricants, an HF Sinclair brand.
“Lubrication today is not simply about routine greasing schedules. It plays a central role in contamination control, extending component life and preventing unplanned downtime. This requires a more disciplined approach, combining condition monitoring, cleaner handling practices and higher-performance fluids to identify issues early and keep critical assets operating reliably.”
As mining companies look to maximise asset life and reduce unplanned downtime, lubrication strategy is becoming an increasingly important part of overall reliability planning.
The key to enhancing machinery efficiency
Mining equipment operates under conditions that challenge both machine components and the lubricants that protect them. Shock loads, abrasive particles and large temperature swings place continuous pressure on gears, bearings and seals.
Over time these stresses can degrade lubricant performance. Oxidation, contamination and viscosity changes may affect the protective film that separates metal surfaces. When this film is compromised, friction increases and wear accelerates.
Traditional mineral oils have been widely used for many years. However, the operating conditions of modern mining fleets are pushing the limits of conventional lubrication approaches. Longer duty cycles and higher utilisation rates mean lubricants must maintain stability for extended periods.
Advanced synthetic lubricants have therefore gained increasing attention across the sector.
These lubricants are increasingly favoured in mining environments because of their ability to perform consistently under demanding operating conditions. They can withstand higher operating temperatures while also providing reliable protection during low-temperature start-ups, helping maintain lubrication integrity across a wide range of environments. In many applications, synthetic formulations also offer extended oil life.
Their stronger wear protection supports longer component service life, while improved resistance to contamination helps keep systems cleaner for longer periods.
Synthetic lubricants also typically exhibit a lower coefficient of friction, which can contribute to improved fuel efficiency and overall energy performance. Crucially, they maintain protective film strength under heavier loads, making them well suited to the intense operating demands of modern mining equipment.
Moreover, improving lubrication performance is not only about selecting the right product. Monitoring lubricant condition is equally important and oil analysis programs allow maintenance teams to observe changes in wear metals, contamination levels and viscosity.
Susinski compares oil analysis to a diagnostic test for mining equipment. “It is essentially a blood test for machinery,” he says. “It provides early warning of wear, detects contamination and monitors lubricant health, allowing operators to plan maintenance before problems escalate.” By shifting maintenance from reactive repairs to data-driven planning, operators can avoid costly disruptions. “The most expensive repair,” he adds, “is the one you did not plan for.”
Such practices are becoming increasingly aligned with predictive maintenance strategies. By combining advanced lubricants with condition monitoring, mining operations can improve equipment efficiency while reducing unexpected stoppages.
Engineering the right product
The growing focus on lubrication performance has also placed greater emphasis on product design. Lubricants used in mining applications must perform reliably in environments where loads are heavy and operating conditions can change rapidly.
Petro-Canada Lubricants has been developing synthetic gear oils intended for severe duty mining applications. These formulations are designed to provide strong film strength and stable viscosity under high temperatures and sustained mechanical stress.
The objective is to ensure that drivetrain components such as electric wheel motors remain protected throughout demanding operating cycles. Maintaining lubricant stability helps reduce friction and wear while supporting longer service intervals.
At the same time, lubrication strategy extends beyond formulation. Effective use of advanced lubricants requires proper contamination control, filtration and condition monitoring. Without these practices, even high performance products may struggle to deliver their full benefits.
But interpreting oil analysis results, identifying contamination risks and setting appropriate warning thresholds require specialist knowledge. Collaboration between lubricant suppliers and maintenance teams can help translate technical data into practical maintenance decisions.
For mining operators managing large fleets, these insights support more structured maintenance planning and lubrication data can inform decisions on service intervals, component inspection schedules and broader reliability programmes.
Petro-Canada Lubricants’ high performance, heavy-duty product line is designed to operate in these extreme conditions typical of mining environments. Its ENDURATEX™ Synthetic OHV 680, for example, is engineered to perform under high-pressure loads common in wheel motor gear systems used in large haul trucks.
Formulated using advanced synthetic base oils, the lubricant delivers strong film strength and wear protection, helping safeguard critical components from sustained mechanical stress. It is suitable for both AC and DC motor-driven wheel systems, where maintaining lubrication integrity is essential to supporting reliable drivetrain performance and extending equipment service life.
Long-term gains
As mining equipment becomes more advanced and operational expectations increase, lubrication will remain a critical factor in protecting machine health. Combining engineered synthetic lubricants with disciplined monitoring and expert interpretation helps operators extend equipment life while maintaining reliable performance.
For fleets operating at scale, small improvements in wear protection or service life can produce meaningful operational benefits. In an industry where uptime is closely linked to productivity, effective lubrication strategies continue to play an essential role.
To learn more about how advanced lubrication strategies can support haul truck performance and reliability, download the free white paper below.
