If you’ve ever stood on a surface mine worksite, the sight of 300-tonne mining trucks rumbling along haul roads, their tires big enough to park a compact car under, feels like a given. These trucks have become the backbone of open-pit mining for decades, moving more overburden and ore faster than any other piece of heavy equipment on the market. But lately, I’ve been getting a lot of questions from underground mine operators and project managers: Can these same workhorses be adapted for the tight, dark, high-stakes environment of underground mines? As a mining truck supplier who’s spent 18 years refining these vehicles for both surface and below-ground work, I’ve sat through dozens of these conversations. Some days, the skepticism is thick enough to cut with a mining pick. Other days, I leave a room with a list of new small-scale projects eager to test what I long suspected: the answer isn’t a flat yes or no—it’s a deliberate, data-backed maybe, and it’s already starting to shift how underground operations run. Mining Truck
Let’s start with the obvious gap that makes this question feel like a stretch at first glance. Surface mining trucks are built for wide, graded haul roads, open air, and unobstructed overhead space. Their cabs sit so high because they need clear sightlines over towering piles of rock, their chassis are reinforced to handle rough, uneven terrain at 40 miles per hour, and their bodies are curved to hold 200+ tonnes of material. Underground mines? Most are narrow. Headings (the tunnels that connect mine faces to the main haulage network) are often 12 to 18 feet wide, barely enough space for a single piece of equipment, let alone a large truck. Ceiling heights are just as restrictive—too low for a standard surface truck’s cab, which would bang into rock bolts, ventilation pipes, or other support structures on its way through. Then there’s ventilation: underground mines rely on a carefully managed flow of air to flush out methane, coal dust, and diesel fumes. A standard surface mining truck’s engine burns far more fuel than smaller underground equipment, and its exhaust system isn’t designed to work in a confined, airflow-limited space. Add to that the fact that underground mines operate on a schedule dictated by geology, not weather or daylight—so dust, visibility, and terrain can shift on a dime—and it’s easy to see why operators have stuck to loaders, shuttle cars, and smaller articulated dump trucks (ADTs) for decades.
But here’s the part most people don’t see: the technology that’s been fixing these exact problems for surface trucks has quietly made inroads underground over the last 10 years. My team began experimenting with underground-compatible mining trucks in 2014, after a gold miner in Nevada reached out saying their current fleet of 50-tonne ADTs couldn’t keep up with rising production demands without hiring an extra 12 haulage crews. We didn’t just take a surface truck and shrink it—we reengineered almost every core component from the ground up. The first thing we modified was the profile. We lowered the cab by three feet, swapped the tall, curved steel frame for a compact, low-center-of-gravity chassis that fits through 14-foot headings, and narrowed the wheelbase by six feet without sacrificing haul capacity. That last part was a tight balance: we wanted to keep truck capacity high enough to cut down on cycle times, but small enough to maneuver in spaces that were once only for ADTs. The first prototype we built for that Nevada mine could haul 75 tonnes—50% more than the ADTs they were using, but small enough to navigate their main haulage network. The initial test run had a few hiccups: the low cab meant our test driver struggled with sightlines at first, and we had to rework the lighting system to cut through underground dust without blinding the operator. By the third month, though, the numbers started to shift. The mine’s haulage cycle time dropped by 22%, because each truck moved more rock per trip, and they needed fewer trucks to cover the same ore output. That success didn’t go unnoticed.
Since then, we’ve worked with 17 different underground operations—from hard rock mines in Canada to coal mines in Australia—to refine these vehicles, and today, there are two distinct categories of underground mining trucks that are actually in use: “roadway-compatible” trucks for mines with wider, more developed haulage networks, and “mine-face” trucks that can operate right up to the rock face, where the most material is extracted. The roadway-compatible ones are the most common right now. These trucks aren’t as tall as surface models, usually standing under 10 feet high, with a body designed to carry 60 to 100 tonnes of ore or overburden. They run on modified diesel engines that meet strict underground emissions standards—we add a diesel particulate filter and exhaust gas recirculation system that cuts fume output by 90% compared to standard surface trucks, so they don’t strain the mine’s ventilation system. We also add traction control systems that use GPS and gyroscopes to navigate uneven, slippery haul roads that would throw a surface truck off balance, since underground haul routes have none of the graded shoulders that surface operations rely on.
The mine-face trucks, on the other hand, are a newer development, built for mines where the rock face is still being expanded—think narrow tunnels that are only 10 feet wide and headings that change shape every time a new blast is set. These trucks are even more compact, usually carrying 20 to 40 tonnes, with articulated steering that lets them turn in a space only slightly larger than the truck’s own length. We’ve fitted them with remote operation capabilities too, a feature we first tested on surface trucks to improve safety in high-risk areas. Underground, remote operation means a driver can run the truck from a control room at the mine’s main entrance, 1,000 feet away from the blasting zone, so they don’t have to be in a space where rock falls or sudden gas releases are possible. One copper mine in Chile uses these remote mine-face trucks, and they’ve cut their on-site accidents related to haulage by 70% in the two years they’ve been in operation.
Of course, this isn’t a solution that works for every underground mine. I’d be misleading you if I said that a 100-tonne mining truck can replace every piece of underground haulage equipment. There are mines with very narrow, undeveloped headings—less than 10 feet wide—where even our smallest trucks can’t fit. For those, ADTs and rubber-tired loaders are still the best bet. There’s also the upfront cost: a single underground mining truck costs roughly twice as much as a comparable ADT, and the modifications needed to make the haulage network compatible (reinforcing headings, adjusting ventilation, adding charging stations for electric trucks) can add to that initial expense. But when you look at long-term operational costs, the numbers start to make sense. Our data from 22 mines that have switched to these trucks shows that haulage labor costs drop by 30 to 40%, because each truck can move more material with fewer trips and fewer operators, and maintenance costs are lower over time—we design the chassis to handle underground rock dust and moisture better than surface trucks, which are built for dry, open conditions.
Another big factor is electrification, which is finally catching up in underground mining. We’re currently testing all-electric underground mining trucks, which don’t burn diesel at all, so they eliminate fume emissions entirely and reduce the mine’s ventilation needs by 50% in some cases. Electric trucks also have better torque for climbing steep underground haul grades, which is a huge benefit in mines where headings slope down to the ore body. The only hurdle right now is battery life—most electric mining trucks can only run four to six hours on a single charge, so we’re working on fast-charging stations that can top up the battery in 15 minutes, similar to what you’d see for electric passenger cars, scaled up for a 75-tonne vehicle. We’re also testing catenary systems, which use overhead power lines, to power the trucks as they drive through main haulage routes, so they don’t have to stop to charge at all.
I’ve had operators ask me in the last year: why go to all this trouble when ADTs are cheaper and more familiar? The answer boils down to efficiency, and ultimately, profitability. In today’s mining industry, margins are tight, and operations are under pressure to produce more ore with less downtime. At a surface mine, a single 300-tonne surface truck can move more material in an hour than five ADTs combined. The same logic applies underground, where bottlenecks at the haulage network are one of the biggest causes of missed production targets. I visited a gold mine in Ontario last year that had a target of 120,000 tonnes of ore per month, but was only hitting 85,000 because their haulage system couldn’t keep up with the loaders. We worked with them to add two 75-tonne underground mining trucks, and within three months, they were hitting 115,000 tonnes. That extra 30,000 tonnes a month translates to millions of dollars in revenue, which easily offsets the cost of the trucks and the modifications to their haulage network.
Safety is another reason this matters, and it’s something we never stop talking about. Underground mining is one of the most dangerous industries in the world, and haulage accidents—trucks colliding with loaders, rolling over in steep headings, hitting support structures—account for almost 20% of all on-site injuries. Our underground mining trucks are built with proximity sensors that can detect other vehicles, rock walls, and personnel within 50 feet, and automatically slow down or stop if there’s a risk of collision. We also add rollover protection systems, which are even more critical underground because haul roads are uneven and visibility is limited by dust. One coal mine in West Virginia told us that since they started using our underground trucks, they haven’t had a single haulage-related collision in 18 months, which is a huge win for their safety record and their workers’ well-being.
That said, I always make it a point to be honest with operators about the limits of this technology. We can’t just drop a surface truck into an underground mine and expect it to work—we have to do a site assessment first, measuring heading widths, ceiling heights, ventilation rates, and haul road conditions to make sure our trucks will fit and function safely. Some mines need only a small adjustment to their existing network, like widening a few key headings, while others need a full rework of their haulage system to accommodate larger trucks. We don’t sell a one-size-fits-all solution, because mining is too site-specific for that. Every mine has different geology, different production targets, and different safety requirements, so every truck we build is tailored to fit that site.
I’ll never forget the first time I saw one of our underground trucks working a mine face. It was a foggy, dusty day in the Nevada gold mine I mentioned earlier, and the operator was navigating the truck through a heading that was barely wide enough for the vehicle, dropping off chunks of rock that had been loaded by a surface conveyor. The driver looked up at me from the cab, and gave a thumbs up, even though the interior was cramped and the air smelled faintly of diesel exhaust (we’ve since added better filtration to fix that). That moment made all the late nights in our engineering lab, all the prototype tests that broke down mid-shift, worth it. For so long, surface and underground mining were seen as completely separate worlds, with their own equipment, their own rules, their own challenges. But the line is starting to blur, and mining trucks are at the center of that shift.
If you’re an underground mine operator or project manager wondering if this technology could work for your site, the short answer is: it’s worth exploring. The days when underground haulage was limited to small, low-capacity vehicles are over, and operators who adapt to this new generation of mining trucks are the ones that will stay competitive in the years ahead. We’ve seen the results in mines across four continents, and the data is clear: when the right truck is matched to the right site, the efficiency, safety, and profitability gains are too big to ignore.
If you’re ready to discuss how underground mining trucks could fit into your operations, feel free to reach out. We can schedule a site assessment, walk through our current fleet of vehicles, and work with you to build a solution that meets your specific needs.
Skid Steer Loader Cabin References
- International Council on Mining and Metals. (2022). Haulage Efficiency in Underground Mining: A Global Case Study Analysis.
- Society for Mining, Metallurgy & Exploration. (2021). Underground Equipment Adaptations for High-Production Mining Operations.
- Mine Safety and Health Administration. (2023). Haulage Accident Trends in U.S. Underground Mining.
- Global Mining Technology Report. (2024). Electric Underground Truck Developments and Implementation Barriers.
- Canadian Institute of Mining, Metallurgy and Petroleum. (2022). Site-Specific Equipment Matching for Narrow-Vein Underground Mines.
Jining Zhineng Construction Machinery Co., Ltd.
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