The Problem: Conveyer belt system subside in several places.
At Newmont Gold's Mine at Boddington, South East of Perth, the conveyor belt system was in danger of becoming unstable because of weak ground.
The mine engineers called in Uretek Ground Engineering. With previous experience of many similar problems, for example, at the Glennies Creek Hunter Valley coal mine, Uretek's Tom Bailey knew the solution.
Geotechnical work to log the depths and dimensions of the mine conveyor belt structure
The first step was to determine and log the precise depths and dimensions of the underground footings of the affected construction elements. These footings were quite massive: the slab holding the motor drive for the belt pulley system was 25 x 12 metres and 1.5 metres deep, built onto 12 metres deep spoil from past mining.
The five affected pedestal footings supported sections of the two kilometre long conveyer belt rising to more than 20 metres above the ground. The footings varied in size up to 6m x 4m x 1.5m set 3.5m under the surface.
Uretek resin injections 15m down to correct the mine conveyor system
The Uretek mines operations team injected Uretek expanding structural resins into the foundation ground areas, at angles to get directly under the footings. In some places injection tubes of 15 metres were required.
The Result of 19 days Uretek work: Conveyer system up and running again on stronger foundations and with no down-time for the mine
The conveyor belt system was returned to very stable operating conditions in just 19 days. No mine downtime was incurred and the Uretek solution was judged to be very effective and economical.