RECO successfully tendered for the design and supply of the two reclaim tunnels with a precast concrete arch design based on the TechSpan® system at Newpac mine in NSW. One tunnel incorporates three chambers, including one for bobcat turnaround. The other tunnel incorporates five different chutes to allow coal to be delivered from the stockpile above through a valve onto the conveyor below. This has been done using a unique ring beam system to tie the arches together and to support the valves. This innovative design improves construction efficiency and reduces costs.

The intricate arch design accommodates various dead and live loading cases arising in relation to the height and position of the coal stockpile and movement on top of the stockpile. The design also accommodates considerable changes in grade to some sections of the tunnels.

Reinforced Earth headwalls and wingwalls were adopted at tunnel entrances.