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PT Freeport Indonesia | GBC (Grasberg Block Cave) Mine Service Shaft

The GBC (Grasberg Block Cave) is an underground copper and gold mine located within the Grasberg minerals district, Papua Province, Indonesia. More information here

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


Underground Mining Jobs Indonesia
Client:PT Freeport | Grazberg Block Cave
Location:Freeport GBC West Papua
Contract Duration:5 years
Safety Statistics:0.0 LTIFR

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Nick Maguire Manager Mechanised Mining and Raise Boring

Nick Maguire

Manager Mechanised Mining and Raise Boring

Since 1996, Nick’s career to date has predominantly involved underground metalliferous mining.
His experience gained during this time has been from the ground up, having spent years working underground at the ‘coal face’ through to statutory and senior management positions on site and at corporate head offices. This has given Nick an in depth knowledge of all aspects associated with underground mining.

Tracey Chan

Chief Financial Officer & Company Secretary

Tracey is a CPA qualified Accountant with over 22 years’ experience, 9 of which have been with RUC Mining Contractors as Financial Controller.  Prior to her tenure with RUC Mining, she worked in various industries including engineering and construction, property and telecommunications across Perth, Melbourne and London.  Tracey leads the Finance, Procurement, and supply chain functions, supporting internal and external stakeholders, while also managing company secretarial obligations for RUC Mining and its subsidiaries.

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