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Copper Mountain Mining Corporation (CMMC) required a vehicle underpass at their Copper Mountain Mine site located in Princeton, BC. CMMC engaged Allnorth to propose options and it was decided that a multiplate culvert would be best suited for this application. Subsequently, CMMC engaged Allnorth to provide engineering, design and construction management services for the multiplate culvert. The structure would be capable of handling loaded Komatsu 830E haul trucks in both directions, while maintaining regular vehicle traffic within the culvert.

The Komatsu 830E haul trucks required a lane width of 13.5 metres, and a berm on either side of the haul road at 2.8 metres high. With these parameters in mind, the culvert measured 7 metres high by 11 metres wide and 65 metres long. Due to significant loading, a large foundation was required to transfer the loads and secure the entire culvert-soil system. During the foundation selection process, it was decided that a combination of a large concrete footings and subgrade preparation was required. In addition, the base channels were precisely laid out and cast into the concrete footings. The footings required over 690m3 of concrete, spanned 4 metres in width, 1.2 metres deep and 85 metres in length.

Allnorth successfully designed an economical, durable, yet sustainable structure that met the requirements of these vehicles.

Due to the COVID-19 pandemic, and floods experienced in the area, the project faced undesirable scheduling challenges. Allnorth was able to mitigate this through management, coordination and constant communication, keeping the project on track.


  • Civil engineering
  • Structural engineering
  • Surveying
  • Materials testing
  • Construction management

Princeton, BC

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With locations across Canada and into the US and Mexico, Allnorth prides itself on being responsive to client needs and to providing leading-edge methodologies, technologies and protocols. Having a local presence helps us build strong relationships, and working cross functionally throughout the company helps us leverage the strengths of our entire team to deliver successful client solutions. Contact us today for more information as to how we can work together for you.

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