Mining Intelligence and News
Australia

Cliffs Mine

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Categories

Summary

Mine TypeUnderground
StatusInactive / Suspended
Commodities
  • Nickel
Mining Method
  • Bench stoping
Backfill type ... Lock
Production Start... Lock
Mine Life... Lock
SnapshotThe Cliffs mine is a part of Nickel West Operation.

Nickel sulphide ore is mined at the Cliffs underground mine and processed through a concentrator and dryer at Leinster.

The Nickel West Operation transitioned into temporary suspension at the end of the first half of FY2025. The decision to temporarily suspend Western Australia Nickel, announced on 11 July 2024, follows oversupply in the global nickel market.

The BHP intends to review the decision to temporarily suspend Western Australia Nickel by February 2027.

Owners

SourceSource
CompanyInterestOwnershipInvestor's Info
BHP Group Ltd. 100 % Indirect
BHP Nickel West Pty Ltd. (operator) 100 % Direct
The Cliffs mine is wholly owned and operated by BHP Nickel West Pty Ltd, a subsidiary of BHP.

Contractors

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Deposit type

  • Intrusion related
  • Metamorphic

Summary:

Steeply dipping massive textured nickel-sulphide mineralisation associated with metamorphosed ultramafic lava flows.

In the Cliffs section, the Cliffs Ultramafic Unit has a total thickness of up to *420 m: the upper unit, which comprises a series of stacked spinifex-textured flows, can be up to *200 m thick, and the peridotite base generally attains similar thicknesses. The discrete flows making up the upper unit display a typical range of spinifex textures, from fine random to coarse plate, which correlate with the A–B komatiite zonation described by Pyke et al. (1973). Conversely, the lower cumulate unit contains both orthocumulate and mesocumulate textural zones, and is dominated by mesocumulate texture. Pseudomorphed olivine occurs as both equant and elongated crystals and is typically in the range 2–10 mm long, although in areas the long axis of crystals can reach 2 cm. Bimodal crystal size distributions occur in places and have a population of elongated crystals up to 2 cm-long set in a matrix of finer (2– 10 mm) former olivine grains. Typically, the elongated crystals display a shape-preferred orientation, with their long axis parallel to the flow top. Thin (up to *10 cm thick) horizons of skeletal and hopper olivine crystals, ranging in size from 8 mm to 1.5 cm, occur sporadically in the lower peridotite unit. The coarse mesocumulate grades into a finer orthocumulate along strike from Cliffs as the Cliffs Ultramafic Unit thins to *180 m northward.

The Cliffs Ni deposit is located along the basal contact of the Cliffs Ultramafic Unit (lower peridotite), and is developed along a strike extent of *800 m. Typically, the mineralised zone comprises a basal massive Fe–Ni–Cu sulfide zone, overlain by matrix and stringer sulfide, and a final upper zone of disseminated sulfides. The basal massive sulfide horizon varies in thickness along its strike length from *5 cm to *9 m (Rosengren 2004). Local thickenings are inferred to represent structural remobilisation related to heterogeneous strain. The primary sulfide assemblage comprises pyrrhotite pentlandite–chalcopyrite–pyrite (Grguric et al. 2006).

Reserves

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Mining Methods

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Heavy Mobile Equipment

Fleet data has not been reported.

Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Commodity Production

Combined production numbers are reported under Nickel West Operation

Production Costs

Commodity production costs have not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2025
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2025

Workforce

Aerial view:

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