Forrestania’s camp of nickel sulphide deposits is hosted by a sequence of ~2.9Ga meta-igneous and metasedimentary rocks that are part of the Forrestania Greenstone Belt (FGB) of the Youanmi Terrane of the Eastern Yilgarn Craton.

Forrestania’s nickel deposits is the ‘Kambalda-style’ Type 1 and Type 2 models where nickel sulphides are interpreted to have accumulated in channelised komatiitic lava flows. Many of Forrestania’s deposits are often tectonically displaced from the original depositional locations and have been deformed and/or dismembered by one or more local and/or regional post-depositional tectonic events.

The main deposit type is the komatiite hosted, disseminated to massive nickel sulphide deposits, which include the Flying Fox and Spotted Quoll deposits. The mineralisation occurs in association with the basal section of high MgO cumulate ultramafic rocks.

The greenstone succession in the district also hosts several orogenic lode gold deposits, of which the Bounty Gold Mine is the largest example.

Spotted Quoll’s mineralisation is of a brecciated style, containing clasts of quartz and garnet schists, and occurs in and along a complex shear zone, which is overlain by BIF and metasediments. As is common in most ultramafic rocks in the Forrestania region, amphibolite grade metamorphism has destroyed any primary volcanic textures. The deformed mineralisation has also undergone hydrothermal alteration that has changed the su ........

Spotted Quoll is an underground mine which is a part of Forestania operation.

As end of FY22 mineral resources estimate extends to ~1.3km below surface, and ore mining has reached to a depth of ~1.0km.

The mining method at Spotted Quoll is long hole stoping with filling of the mined voids with paste. The minimum mining width is 3m and the length of stopes ranges from 10 to 30m, depending on geotechnical conditions and local mineralised lense geometry. Stope heights range from 7 to 15m.

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