Dual Truck Mobile Sizer

The Dual Truck Mobile Sizer allows a significantly reduced truck fleet to service multiple benches or mine faces. This provides much needed flexibility, while allowing the mobility and high productivity of a conventional, shiftable, at-the-face mining system.

  • Equipment Details
  • DTMS Mobility


The Dual Truck Mobile Sizer (DTMS) is an innovative technical solution that offers haul truck flexibility with complete mobility, utilizing a shiftable face conveyor.

There have been a few new developments in semi-mobile station design that have yielded some improvement on reducing the cost of relocation. However, the challenge of in-pit crushing stations using anything other than fixed conveyor systems is still an issue.

FLSmidth engineered a unique solution with an innovative machine that incorporates hinged, flat hoppers. The system can be relocated throughout the project as the haul distances increase.

Operational Description

The operational sequence of the system begins as a truck backs into the skip:

  • A truck backs into the skip against a curb in the floor. After dumping its load on the skip floor, it then slowly pulls ahead, lowers its bed, and pulls away.

  • After the truck clears the end of the skip, the skip can be raised. As the skip is elevated, it pours material from the discharge of the skip and deposits the material into the apron feeder hopper.

  • As material is introduced onto the apron feeder, it conveys the material to the sizer where it is crushed to the appropriate size.

  • After being crushed, the material is deposited onto the discharge conveyor where it is taken to the bench conveyor. This process is performed while another haul truck is depositing material into the twin skip, increasing the number of truck cycles.

Based on client preference, the DTMS is offered in two available models of mobility. 

  • Fully Mobile / Self Propelled
  • Semi Mobile / Crawler Transporter

A fully mobile version utilizing twin crawler tracks integrated into the main chassis is offered. This is a completely self-contained machine. Steering and maneuvering is accomplished by differential (skid) steering of each crawler. Four integrated and guided lifting cylinders are attached at the corners of each crawler frame. Extension of these cylinders allows the crawlers to contact the ground, thus raising the entire DTMS for transport.

When multiple DTMS systems are employed in the same mine, the semi mobile version of the machine becomes an economically viable choice. A single crawler transporter type machine can service multiple stations, reducing the overall initial capital costs, while still retaining a very high degree of mobility. The design of this semi mobile station is such that it significantly lowers the overall center of gravity of the entire machine as compared to current market systems, additionally allowing for a single move to relocate the entire DTMS.

In a conventional system, the overall design needs to provide sufficient clearance under each module for a typical crawler transporter to drive under for lifting and transport. The DTMS significantly reduces this height by using four lifting cylinders to raise the entire machine, allowing a conventional crawler transporter access for relocation of the system.

As we can see, this innovative crusher station is unique in many ways; especially in the area of mobility as compared to current technologies on a scale of this magnitude. The DTMS can literally be relocated as frequently as needed while minimal cost is incurred each time it is repositioned. - Not hundreds of thousands to millions of dollars as with current technologies.

Major operational savings magnify, as well as production rates when a holistic type system is employed. As previously mentioned, a typically system would include: 
  1. DTMS(s)
  2. Rail mounted overland hopper
  3. Shiftable face conveyor
  4. Out of pit overland conveyor
  5. Mobile Stacking Conveyor (MSC)