Mine Dewatering

Rockwater Projects

Mine Dewatering

Representative Projects


Cliffs Asia Pacific: Central Yilgarn Operations

Cliffs Asia Pacific mines about 11 mtpa of high-grade iron ore from banded iron-formation deposits at Windarling, Mt Jackson and Koolyanobbing, in the central Yilgarn Craton. The ore occurs as steeply dipping, tabular-shaped bodies with high porosity and permeability. Dewatering of the ore is achieved using in-pit bores and sumps. Rockwater designed and supervised the drilling of dewatering bores in the mine pits using a variety of techniques including: dual-rotary, mud-rotary, air-rotary and conventional hammer. Rockwater also regularly reviews mine plans and bore performance to assists Cliffs with on-going management and planning of their dewatering operations.


Evolution Mining: Westonia

Evolution Mining re-commenced mining of the Edna May gold deposit, near Merredin, during early 2010. The hanging-wall of the ore-body is bounded by highly permeable micro-granite intrusions that were emplaced along a major shear. High inflows from this aquifer posed a major problem during earlier phases of mine operation. Rockwater established a dewatering borefield comprising a combination of the three ex-pit dewatering bores drilled into the shear and two "breakthrough" bores drilled in a flooded decline beneath the pit floor.


Kimberley Diamond Company: Ellendale

Kimberley Diamond Company operates the Ellendale 4 and 9 diamond mines in the Canning Basin of the Kimberley region Western Australia. To enable dry mining in each mine, shallow and deep lamproite aquifers require dewatering. On Kimberley Diamond Company's behalf, Rockwater has undertaken hydrostratigraphic drilling programmes to identify aquifers, and geological contacts and structures associated with major groundwater inflows. Effective dewatering borefields have been established, which since 2003 have lowered water levels by up to 120 m. Rockwater also provides on-going advice on dewatering strategies and assistance in dewatering management as plans for the mines evolve overtime.



Western Areas: Forrestania

Western Areas is mining the Flying Fox and Spotted Quoll nickel sulphide deposits at Forrestania. The mineralisation at Spotted Quoll occurs near the contact of metasedimentary and ultramafic strata. Rockwater commenced work at Spotted Quoll in the exploration phase of the mine to investigate the extent and permeability of fractured bedrock in the area. Yields of up to 50 L/s were produced by bores located to the south of a major fault which trends oblique to the bedrock strata. Extraction from the bores has effectively dewatered the deposit so that underground development of the mine now requires minimal pumping. The water from Spotted Quoll was disposed of using injection bores, an evaporation basin and an abandoned mine pit. Rockwater continues to work with Western Areas to provide guidance for their dewatering programme.





Other Mine Dewatering Projects:

  • KCGM - Deep Bore

  • WMC - Phosphate Hill, QLD

  • Golden Grove - Gossan Hill

  • Tectonic Resources - Ravensthorpe




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