OTR Tire Solutions for US Mining: Processing Haul Truck and Loader Tires

By:     Kieran Donnelly

Mining operations across the United States generate end-of-life OTR (off-the-road) tires at a scale that most recyclers never encounter. A single haul truck tire from a large-scale surface mine can weigh 4,000 to 12,000 pounds and stand 13 feet tall. A medium-sized coal or copper mine may retire dozens of these tires per year. Managing them is a logistics, safety, and regulatory challenge that requires purpose-built equipment and a clear operational plan.

This article covers the OTR tire categories generated by US mining operations, the processing equipment available to handle them, the regulatory requirements that govern their disposal, and the practical considerations for setting up OTR tire processing on or near a mine site.

OTR Tire Categories in US Mining Operations

US mining generates OTR tires from several distinct vehicle categories. Surface mine haul trucks, including the Caterpillar 797 and Komatsu 930E class machines that dominate large copper, coal, and iron ore operations, use the largest tires in regular commercial production: sizes from 53 inches to 63 inches in diameter, weighing 4,000 to 12,000 pounds each. These are fundamentally different from any tire a standard recycling operation handles.

Smaller OTR categories from mine loaders, graders, scrapers, and service trucks are more manageable but still significantly larger than highway truck tires. Loader tires in the 35-inch to 49-inch range are common across surface and underground mining. Underground mining equipment generates smaller OTR categories in confined tire profiles designed for tunnel environments.

The Core Processing Challenge: Size Reduction

The defining challenge with large OTR tires is that their physical size makes them unmanageable for any standard processing equipment. A 57-inch haul truck tire does not fit in a standard tire baler. It cannot be transported on a standard flatbed without permits and specialized loading equipment. It cannot be stored efficiently in anything less than a large open area. The first processing objective is size reduction, which transforms an unmanageable object into sections that can be handled, transported, and processed further.

The Gradeall OTR Tire Sidewall Cutter is designed to cut the sidewalls from large OTR tires, producing sections that are significantly more manageable than the whole tire. The Gradeall OTR Tire Splitter further reduces the tread and belt section into segments suitable for transport and downstream processing. Together, these two machines form the core of an on-site OTR tire size reduction capability.

On-Site vs. Off-Site Processing for US Mine Operations

US mining operations face a fundamental decision in OTR tire management: process on site or contract out. On-site processing makes sense for operations that generate enough OTR tires to justify the capital investment in processing equipment, that have the site space and electrical infrastructure to support the equipment, and that have the operational capacity to manage the additional process safely.

Off-site processing through a specialist contractor makes sense for smaller mining operations generating fewer tires per year, or for mines in remote locations where on-site infrastructure investment is prohibitive. The contractor brings equipment to the site, processes the tires, and removes the reduced-size material. Gate fees for large OTR tires can range from $50 to $300 or more per tire depending on size and location, making the on-site capital investment case straightforward for larger operations.

“The economics of on-site OTR tire processing are compelling once a mine is generating more than 50 to 100 large tires per year,” says Conor Murphy, Director of Gradeall International. “At that volume, the gate fee savings alone typically pay for the equipment within 18 to 24 months, and the operational benefit of managing the tires on your own schedule rather than waiting for a contractor is significant.”

Fire Safety and Storage for OTR Tires

Unprocessed OTR tires stored on a mine site represent a significant fire risk. A single large OTR tire contains an enormous amount of combustible material, and a tire fire involving multiple large OTR tires is extremely difficult to control and generates intense heat and toxic smoke. State environmental permits for tire storage, including at industrial sites, typically impose storage limits and fire safety requirements.

Rapid on-site processing reduces the inventory of whole OTR tires and the associated fire risk. Cut and split OTR tire sections are still combustible but present a lower fire risk than whole tires because their open structure lacks the oxygen-trapping geometry of a whole tire. Maintaining a processing cadence that prevents excessive accumulation of whole tires is a practical fire safety measure in addition to a regulatory compliance strategy.

For US mining operations planning an OTR tire management program, the complete Gradeall OTR tire cutting equipment range covers the full size spectrum from mid-size OTR through to the largest haul truck formats. Contact Gradeall to discuss the specific tire sizes in your operation and the equipment configuration appropriate for your mine’s OTR tire mix.

Frequently Asked Questions

What state and federal permits govern OTR tire disposal at US mine sites?

OTR tire disposal at US mine sites is subject to state solid waste and waste tire regulations, which vary by state. Most states classify end-of-life OTR tires as solid waste subject to storage limits, handling requirements, and disposal documentation. At the federal level, RCRA provides the framework but defers most tire-specific regulation to states. Mine operators should confirm requirements with their state environmental agency, and with their Mine Safety and Health Administration (MSHA) district for any processing equipment installation requirements.

Can OTR tire rubber be recycled or only disposed of?

OTR tire rubber can be recycled, though the processing pathway is more complex than for passenger tires. Size-reduced OTR sections are accepted by some TDF buyers for energy recovery at cement kilns and industrial boilers. OTR rubber also goes to shredding and granulation operations that produce crumb rubber, though the higher steel and fabric content of OTR tires compared to passenger tires affects processing parameters. The steel wire recovered from OTR tire processing is a separate revenue stream with value to scrap metal dealers.

How do we handle polyurethane-filled or solid fill OTR tires?

Some mine operators fill OTR tires with polyurethane foam or other solid fill materials to eliminate flat tire events in critical haul truck applications. These filled tires require a different processing approach from pneumatic tires. The fill material must be assessed before processing, as some fills are incompatible with standard cutting equipment or downstream recycling routes. Specialist processing is required for solid-fill OTR formats; consult with Gradeall regarding your specific fill type and tire format.

What is the lead time for OTR tire processing equipment delivery to a US mine site?

OTR tire processing equipment from Gradeall is manufactured in Northern Ireland and shipped to the United States. Lead time from order to delivery at a US port is typically 12 to 18 weeks. Add site preparation time, electrical installation, and commissioning for an estimate of total time from equipment order to first production. For mine sites in remote locations, logistics planning for the final delivery from port to site needs to account for road access and any oversize load permit requirements for the equipment dimensions.

How many people does it take to operate an OTR tire processing line?

A basic OTR tire processing line with a sidewall cutter and splitter typically requires two operators: one to operate the cutting equipment and one to handle the tire positioning, which is a significant physical task even with mechanical assistance for the largest formats. Additional labor for moving whole tires to the processing area and moving cut sections to storage or transport areas is also needed. For very large haul truck tires, mechanical handling equipment (front-end loader or telehandler) is required for positioning; manual handling of tires above approximately 1,000 pounds is not practical.

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