FREEPORT GBC SERVICE SHAFT
Scope of Works
Shaft excavation by raise drill strip and line method. The GBC Service Shaft is an 8.5 meter diameter internal, circular, concrete-lined, vertical shaft, fitted with a large double-deck service cage running on tubular steel guides supported by standard buntons on 6.0-meter vertical spacing. The shaft is 353 meters in length, extending from the floor of the headgear room to the shaft bottom. There is a single conveyance in the shaft, running in cage-and-counterweight configuration, a manway, and pipe, electrical, and communications utilities on brackets. The Project included;
Excavation, construction, and furnishing of the Grasberg Block Cave (GBC) Service Shaft, including four stations
Installation of the GBC Service Shaft permanent hoisting system, (2,500 hp Modified Blair) and construction of the associated shaft stations and related facilities
Mobilisation, setup, teardown and demobilisation of the Contractor’s temporary plant forsinking the shaft.
HV & LV power supply, shaft control cabling, communication cabling including fibre optic, sensors, video, instrumentation wiring, installation of permanent conveyances, ropes safety devices and fire water services
Wet and dry commissioning of the entire permanent facility and handover to PTFI