The mineralisation at Cerberus is blind at the surface and is covered by transported material. The original discovery hole (WED4) intersected the mineralisation at a depth of 700m vertically below surface. In contrast to typical exploration discoveries, Poseidon has drilled the mineralised lava channel from the bottom up, and has now defined the mineralisation to within 80m vertically below the surface. The mineralisation is around 450m in width and has a continuous strike length of ~1400m. The mineralisation is currently open at depth and the nickel grades increase with depth.
The Cerberus Deposit consists of 4 types of nickel sulphide mineralisation:
- The Main Zone (lower lode): Generally consists of massive to stringer nickel and some disseminated sulphides which occurs towards the base of the komatiite lava channel within the Windarra Ultramafic unit. The sulphides characteristically have an element of sulphide remobilisation and high grading due to structural overprinting.
- The Hangingwall Zone (upper lode): Occurs as disseminated sulphides and sits around 1-6m above the Main Zone within the lava channel. It is poddier and lower grade than the Main Zone.
- Top Zone: Consists of disseminated “cloud” sulphide that occurs about 10m above the hanging wall (upper lode) zone. It is continuous and high grade over short distances but is poddy at a deposit scale.
- Remobilised Footwall: Consists of structurally remobilised and high graded nickel sulphides which have squirted off into the footwall. These have not been modelled as they are erratic and cannot be tied together in the current wide spaced drilling. These may provide additional localised high grade nickel sulphide pods as drill density is increased. Typically drill intersect grades in this zone are between 3.5% and 7% nickel.
Nickel grades and widths are greatest towards the centre of the komatiite lava channel and form two higher grade zones towards the top and bottom of the mineralised channel. The nickel sulphide intersections typically become thinner and lower grade towards the edges of mineralised zone. This is consistent with Kambalda-style komatiite-hosted nickel models which helps the Poseidon geologist’s to interpret the geology and target the prospective mineralised channel.