Solomon Islands

Kolosori Project

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Mine TypeOpen Pit
  • Nickel
  • Cobalt
Mining Method
  • Strip mining (roll-over)
Mine Life5 years (as of Jan 1, 2021)
ShapshotKolosori project, located on Isabel Island in the Solomon Islands is a direct shipping ore ("DSO") nickel laterite project with transitional and saprolitic ores as saleable products.


Pacific Nickel Mines Ltd. 80 % Indirect
The Project is 80% owned by Pacific Nickel Mines. Landowners have a 20% carried interest in the project.



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Deposit type

  • Saprolite
  • Laterite


The Kolosori deposit exists over a large area of approximately 2km by 3km on Isabel island (Solomon Islands). Individual regolith domains average in thickness ranging between 3m and 10m. The deposits all occur within 50m depth of the topography surface.

Thin fault-bound slices of peridotites are distributed on both sides of the Kia-Korigole-Kaipito Fault System (KKKFS). The ultramafic rocks also outcrop predominately in the south near San Jorge and have been termed the San Jorge Ultramafics. In all locations, they consist of a series of elongate pods of more or less serpentinised harzburgites and dunites, cut by pyroxenite veins. In contrast, only fragments of ultramafic rocks occur further north on Santa Isabel.

The nickel laterite deposits of the Solomon Islands have developed under tropical conditions by weathering and decomposition of the ultramafic host rocks. These processes lead to residual and supergene enrichment of nickel within the laterite profile.

The laterite profile in Kolosori tenement overlies ultramafic rocks and can be divided into two distinct zones. The lower zone consists of saprolitic rock, rocky saprolite and saprolite. The upper oxide zone consists of ferruginous saprolite, limonite, erruginous zone and soil types.

The lower saprolite zone consists of boulders of the bedrock in a soft, earthy matrix. The boulders generally have fresh cores and partially oxidised rims. Highly serpentinized rocks may have more pervasive oxidation and the boulders may be friable and lack a tough core. The matrix contains a high proportion of iron-oxides that are a product of weathering, but bedrock textures are usually still recognisable.

Iron grades increase rapidly upwards across the saprolite-limonite contact, reflecting the displacement of silicate minerals by iron oxides (goethite) as the dominant component. Bedrock textures are not readily recognisable and although relict bedrock boulders do occur, they tend to be more isolated and less abundant than in the underlying saprolite.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.



The nickel ore is mined at a sufficiently high grade for direct export and will be sold as four consistent products.

The ore will be placed in stockpiles for drying however no other processing is currently planned.

Recoveries & Grades:

CommodityParameterAvg. LOM
Nickel Head Grade, % 1.5


Nickel Ore Mt 6.2
Nickel Metal in ore kt 93

Operational metrics

Ore tonnes mined, LOM 0000000
Total tonnes mined, LOM 00000000
* According to 2021 study.

Production Costs

Site cash costs (produced) Nickel USD 00
Assumed price Nickel USD 00
* According to 2021 study / presentation.

Project Costs

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscribe
Total CapEx $M USD  ......  Subscribe
OP OpEx $M USD  ......  Subscribe
Total OpEx $M USD  ......  Subscribe
Net Income (LOM) $M USD  ......  Subscribe
After-tax NPV @ 8% $M USD  ......  Subscribe
After-tax IRR, %  ......  Subscribe
After-tax payback period, years  ......  Subscribe

Heavy Mobile Equipment


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Mine Management

Source Source
Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 6, 2024


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