Australia

Cliffs Mine

Click for more information

Categories

Overview

Mine TypeUnderground
Commodities
  • Nickel
Mining Method
  • Bench stoping
  • Cemented paste backfill
Production Start... Lock
Mine Life2025
ShapshotCliffs underground mine is a part of BHP's Nickel West Operation.

Nickel sulphide ore is mined at the Cliffs and Leinster underground mines and processed through a concentrator and dryer at Leinster.
Related AssetNickel West Operation

Owners

SourceSource
CompanyInterestOwnershipInvestor's Info
BHP Group Ltd. 100 % Indirect
BHP Billiton Nickel West Pty Ltd. (operator) 100 % Direct
BHP Billiton Nickel West Pty Ltd operates the Cliffs Mine Site. BHP Billiton Nickel West Pty Ltd is a wholly owned subsidiary of BHP Group Ltd.

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

Lock

- subscription is required.

Mining Methods

Lock

- subscription is required.

Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

Lock

- subscription is required.

Production

Combined production numbers are reported under Nickel West Operation

Production Costs

Commodity production costs have not been reported.

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Source Source
Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 18, 2023
....................... Subscription required ....................... Subscription required ........... Subscription required ........... Subscription required Subscription required Oct 18, 2023

Aerial view:

Lock

- subscription is required.