CLIENT: Williams Operating Corporation (subsidiary of Barrick Gold Corporation)
PROJECT: Hemlo Mine Reclaimed Pump Station
PROJECT TYPE: Brownfield
LOCATION: Ontario, Canada
SERVICE SCOPE: Design (Infrastructure)
A pump station located on a wall separating two operating tailings dams needed to be relocated due to silting issues caused by tailings levels rising in the dam. Halyard were commissioned to identify an alternative site for the vertical spindle pumps and to design an all-weather enclosure which permits year-round operation of the pumps and allow for reclaimed water to be pumped from the tailings dam back to the process plant.
Several options were investigated, and it was determined that the most suitable solution was to relocate the pumps to a floating barge anchored to the dam wall and located in a relatively deep section of the tailings dam.
Halyard undertook the structural design of the barge and walkway access bridge which included crawl beams within the enclosure to lift the pumps off their mountings and winched along a track installed in the walkway. To ensure the immediate area around the barge did not freeze, subsurface fans intended to continually circulate water were incorporated into the barge design. This design consideration permits the reclaim pumps to operate year-round.
Since the dam wall is due to be raised in the coming years, this solution was a resourceful way to allow for operations to continue pumping with minimal downtime while relocating the pumps on to the floating barge.