Cosmos - Odysseus Project

Click for more information



Mine TypeUnderground
  • Nickel
  • Cobalt
Mining Method
  • Longhole open stoping
Backfill type ... Lock
Mine Life... Lock
SnapshotThe Cosmos Project primarily comprises the development of the Odysseus underground mine focused on the production of nickel concentrate, containing nickel and cobalt metal.

In late January 2024, IGO made the difficult decision to transition Cosmos into care and maintenance. The transition, which is expected to be concluded by 31 May 2024, will prioritise the safe preservation of the Cosmos assets and the completion of select key workstreams include finishing the wet commissioning of the processing plant and processing of existing ore on the ROM pad.

During the transition to care and maintenance, IGO will also assess the value of continuing work on select exploration programs to increase the size and definition of the mineral resource, in particular the AM5 and AM6 orebodies, and optimising the mining and materials handling methods. IGO intends to protect the optionality to restart Cosmos in the future should market conditions improve.


IGO Ltd. (operator) 100 % Indirect
The Cosmos Nickel Project, 100% owned and operated by IGO.



- subscription is required.

Deposit type

  • VMS
  • Metamorphic


Cosmos’ cluster, or ‘camp’ of nickel sulphide deposits, occurs within or adjacent to a local sequence of ~2.7 billion year (Ga) old (Archean age), and now metamorphosed, komatiitic lavas that are part of the Agnew-Wiluna Greenstone Belt (AWGB) of the Kalgoorlie Terrane of the Eastern Yilgarn Craton.

The genetic formation model for the nickel mineralisation is the ‘Kambalda-style’ model where precipitation of nickel sulphides is interpreted to occur in channelised komatiitic lava flows and/or lava tubes. This model proposes two dominant deposit types – Type 1 and Type 2.

‘Type 1’ deposits are interpreted to have formed where the hottest lava in the centre of a lava channel thermally erodes into a sulphidic substrate and massive sulphides accumulate at the channel’s base. This high-grade primary formation style is applicable to the Cosmos, Cosmos Deeps, AM1, AM2, parts of AM5 and the Odysseus Massive zones.

Type 1 deposits are often subject to mobilisation into structural sites when massive sulphide bodies behave plastically or even re-melt under the high metamorphic temperatures and pressures that are generated by local or regional tectonic faulting and/or folding events. The Cosmos Deeps and the Odysseus Massive zone are examples of this remobilisation style.

‘Type 2’ deposits are interpreted to have formed from cooler and slower-flowing lavas than those for Type 1 deposits. In this model, the mineral olivine is envisaged to crystallise from these cooler lavas, with the olivine grains settling to the channel’s base shortly after the precipitation of sulphides. In this model, the coeval sulphides crystallise between the olivine grains, giving rise to a disseminated to ‘matrix’ textured nickel sulphide mineralisation that builds up from the channel base. This style of mineralisation is applicable to the AM5, AM6 and Odysseus disseminated zones at Cosmos.

The sulphide nickel assemblages at Cosmos are ‘high tenor’, meaning that the sulphides are dominated by the nickel-bearing mineral pentlandite (Pe). The sulphide assemblages also contain the sulphide mineral pyrrhotite (Po), with minor amounts of pyrite (Py) and chalcopyrite (Py), and in some pla

The mineralisation typically occurs in association with the basal zone of high magnesium oxide (MgO) cumulate ultramafic rocks.

ODS occurs within the Cosmos ultramafic and is located approximately 1,000-1,100m below surface. The AM5 and AM6 zones are both situated to the south and are thought to be genetically related to Odysseus given they all exhibit similar mineralisation characteristics (grade, tenor and sulphide type)

ODS is an elongated, oblate tubular body that strikes north-south (355°) for over 330m, dips 45° east and plunges -5° to the north. Sulphide mineralisation is best concentrated 20-30m above the footwall and consists of highly disseminated to net-textured pentlandite-pyrrhotite in the central and basal zones and pentlandite-pyrite at the edges of the deposit. A higher-grade central core containing >1.5% Ni can reach a thickness of 65m. The central core is enveloped by disseminated sulphides of lower grade (0.5-1.5% Ni). Sulphide mineralisation bifurcates at the northern end and eventually terminates, due to steeply dipping cross cutting pegmatite dykes that are interpreted to have been intruded along brittle fault structures.

The ODN orebody is located 1,000-1,075m below surface and is interpreted to be the northern continuation of Odysseus mineralisation. The ODN and ODS deposits appear to be bifurcated and offset by northeast striking faults now sealed with pegmatite. The entire ODN orebody is dextrally offset ~60m in relation to Odysseus and the dip is rotated 50° counter-clockwise (now near horizontal).



- subscription is required.

Mining Methods


- subscription is required.


Crushers and Mills

Milling equipment has not been reported.



- subscription is required.


CommodityUnitsAvg. Annual
All production numbers are expressed as metal in concentrate.

Operational metrics

Annual processing capacity  ....  Subscribe
* According to 2022 study.

Production Costs

Credits (by-product) Nickel USD -0.11 / lb *  
Total cash costs Nickel USD 2.43 / lb * **  
All-in sustaining costs (AISC) Nickel USD 2.63 / lb * **  
C1 cash costs Nickel USD 1.98 / lb * **  
Assumed price Cobalt USD 12 / lb *  
Pre-tax break-even price Nickel USD 4.58 / lb *  
Assumed price Nickel USD 7.5 / lb *  
* According to 2018 study / presentation.
** Net of By-Product.

Operating Costs

UG mining costs ($/t milled) USD 47.8 *  
Processing costs ($/t milled) USD  ....  Subscribe
Total operating costs ($/t milled) USD  ....  Subscribe
* According to 2018 study.

Project Costs

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscribe
Sustaining CapEx $M AUD  ......  Subscribe
Closure costs $M AUD  ......  Subscribe
Total CapEx $M AUD  ......  Subscribe
Gross revenue (LOM) $M AUD  ......  Subscribe
EBITDA (LOM) $M AUD  ......  Subscribe
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscribe
After-tax Cash Flow (LOM) $M AUD  ......  Subscribe
Pre-tax NPV @ 7% $M AUD  ......  Subscribe
After-tax NPV @ 7% $M AUD  ......  Subscribe
Pre-tax IRR, %  ......  Subscribe
After-tax IRR, %  ......  Subscribe
Pre-tax payback period, years  ......  Subscribe

Heavy Mobile Equipment


- subscription is required.


Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2023

Aerial view:


- subscription is required.