North Ore Shoot Shaft Recovery
Kennecott Utah Copper and Gold contracted Atkinson to recover its North Ore Shoot (NOS) that was built years before but had since been capped, backfilled, and abandoned. To uncover the old shaft, crews excavated a 230-foot-deep, 28-foot-diameter shaft through unconsolidated waste rock fill to an existing heavily-reinforced concrete shaft collar. Once complete, Atkinson installed a new shaft collar and concrete liner throughout the new excavation, and later removed the existing shaft collar and dewatered the 3,300-foot-deep, 20-foot-diameter shaft.
Late in 2007 the scope of work expanded to include a permanent headframe structure, construction of all surface infrastructure, and a complete retrofit of the underground facilities. The scope included furnish and installation of a dirty water pumping system, shaft steel, ventilation system, and station development.