Borderland constructed approximately 11,000 LF of new 24” HDPE discharge gravity flow pipeline between the mill and a tailings storage facility. The new gravity line required significant earthwork and grading to establish the new horizontal alignment and vertical profile for the transmission pipeline.
Also as part of the project, a pump station was installed to recover, pump, and return decant water to the mill. The decant water is returned to the mill via an 18” HDPE pressurized pipeline.
Location: near Town of Sahuarita, Pima County, Arizona
Construction Cost: $2.7 M
Owner: Hanlon Engineering (ASARCO, LLC)
Project Delivery: DBB
Scope: Lift Station and Transmission Pipeline
The pump station and transmission pipeline project included earthwork, grading, paving, storm drain, rip-rap, fencing/gates, 84” diameter x 10’ deep drop structure, vaults, pads, vertical turbine pumps, hydrogates, trash screens, conduits, wiring, breakers, disconnects, lighting, enclosures, flow meters, pressure indicators, and instrumentation.