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Australia
Lake Johnston Operation

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 Location:
120 km W from Norseman, Western Australia, Australia

  Address:
8, Churchill Court 331-335 Hay Street
Subiaco
Western Australia, Australia
6008
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Fax+61-8-6167-6649
WebsiteWeb
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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Nickel
Mining Method
  • Sub-level caving
  • Longhole stoping
  • Longhole open stoping
  • Backfill
HISTORY
-Emily Ann - 1.5Mt @ 3.5% Ni mined / processed between 2001-2007
-Maggie Hays – initial Resource of 12.3Mt @ 1.5%Ni, mined and processed between 2008-2013
CURRENT RESOURCES & INFRASTRUCTURE
-Maggie Hays - 3.5Mt @ 1.5% Ni for 52kt Ni
-1.5Mtpa process plant (on C&M)
-GR Engineering plant refurb estimate of $31M2 and opex of $36/t2
MOVING FORWARD
- NewExco exploration targeting completed, 1st phase drilling program of 15,000m POW approved, planned for CY2023
- Update mining study on Maggie Hays
- Undertake BFS


Owners

 
CompanyInterestOwnership
Poseidon Nickel Ltd. 100 % Direct

Contractors

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Deposit Type

  • VMS


Summary:

The surface geology at Emily Ann is totally obscured by transported sediments and a thick saprolite profile extends down to about 80 m below the surface.

The deposit occurs in a complex geological setting, consisting dominantly of felsic volcaniclastics hosting subordinate discontinuous lenses of mineralised and barren ultramafics, which dip at between 40° and 60° to the east in the vicinity of the deposit. The ultramafics and associated nickel-sulphide mineralisation do not extend to the bedrock surface and are therefore totally blind. The deposit has been subdivided into two main mineralised structural domains, termed the upper mineralised horizon (UMH) and lower mineralised horizon (LMH).

The UMH has a strike extent of about 520 m and down-dip extent of up to 150 m. The mineralisation is highly variable and consists dominantly of disseminated to matrix pyrrhotitepentlandite and lesser stringer and massive sulphides. The proportion of massive sulphides increases downwards towards the boundary mylonite. The mineralisation in the LMH is of greater economic significance and consists of lenses of high tenor (8-14% Ni) massive nickel sulphides (pyrrhotite-pentlandite) distributed over a strike length of about 520 m and with a down-dip extent of about 270 m.

The Maggie Hays deposit is blind, with the top of the main disseminated sulphide zone commencing at a depth of about 200 m beneath the surface and the massive sulphides at a depth of about 35 ........


Mining Methods

  • Sub-level caving
  • Longhole stoping
  • Longhole open stoping
  • Backfill


Summary:

All ore will be extracted using mechanised underground mining techniques. Development will be undertaken using mechanised jumbo drills for drilling and ground support installation. Diesel underground loaders and trucks will be used for material movement. Stope ore will be extracted by reactivating the existing sub-level cave, supplemented with separate areas of longhole stoping using unconsolidated backfill. Concurrent mining fronts will be established through the use of cemented aggregate fill and in-situ sill pillars.


Crushing and Grinding


Processing

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Operational Metrics:

Metrics2015
Annual processing capacity 1.5 Mt

Reserves at March 17, 2015:

CategoryTonnage CommodityGradeContained Metal
Indicated 2,600 kt Nickel 1.6 % 41,900 t
Inferred 900 kt Nickel 1.17 % 10,100 t
Total Resource 3,500 kt Nickel 1.49 % 52,000 t



Heavy Mobile Equipment:

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Corporate Filings & Presentations:

DocumentYear
Project Description 2022
Project Description 2016
Project Description 2016
Year-end Mineral Reserves 2016
Year-end Mineral Reserves 2015
Feasibility Study Report 2014
Project Description 2003
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