Source Active Pathway Trap - Chemical Scrubber Trap - Chemical/physical scrubber Trap - Physical throttle Modification

Transporting through the Komatiite Formation Sulphur addition and saturation Metals sequester into sulphides Physical concentration of metal rich sulphides Modification of original ore body


Critical Critical Process

: ? Assimilation of A high degree of physical Early timing of sulphide Abrupt decrease in Tectonic High-degree mantle melting to produce ultramafic and komatiite Interaction with S Hydrothermal country rocks to interaction between sulphide concentration – relative magma flux to modification; e.g., , plus volcanic rocks (i.e., a bimodal volcanic High-flux magma pathways Lithospheric faulting rich rocks to induce alteration forming induce sulphur droplets and metals in a proportion of sulphide vs accumulate high folding, faulting association) sulphur saturation ore zones saturation komatiitic melt. silicate proportion of sulphides duplication, remobilisation of

massive sulphides

Constituent Process Constituent What are the processes that that processes the are What process critical the control

Thick, abundant, Bi-modal rock / Cumulate rich Ni content in Fold hinges, Weathered Association with Morphology of Continental S rich rocks and S Changes in Changes in Veins/disseminated laterally extensive association (e.g., thick sequences of rocks, indicated by komatiite indicating lithosphere margins, komatiite Ni concentration in sulphides, Sulphide vs silicate and (e.g., intersecting faults, ; ? concentration in morphology of zones that host Ni ultramafic rocks felsic volcanic rocks greenstone texture and eg., identifying high Ni tenors ratios low Ni content in massive sulphides in identifying rocks, high flux magma e.g., large scale/ komatiites chemistry (e.g., komatiite channels sulphides

: with the potential coeval with rifting) indicating extensive, terranes, where chemistry pathways e.g., deep penetrating trace element silicates may felsic rocks alteration and to produce high-degree melting komatiites are most embayments and faults; rocks coeval chemistry which indicate high Ni in geochemical komatiite flows common (but also channelized with or indicators of indicates crustal sulphides) anomalies consider possible environments rifting. contamination)

younger ages)

Targeting How can we target each each target we can How process constituent

Komatiite Archean and MgO >32% map Crustal Felsic Relative changes in Komatiite sulphide- Map of change in Fold hinge map Alteration mineral occurrence map Mafic rock Proterozoic rock age (m+c) map (m) Sulphidic rock map contaimination Komatiite with insitu occurrence map (m) komatiite thickness Structure occurrence map Ni tenor maps (m+c) primary morphology (m+g) map (m+WAROX+ occurrence map (m) map (m+c+WAROX) maps/plots (e.g., regolith map (m+reg) (m) map (m+g) complexity map (m) (m+c) texture map (m+c) in komatiites (m+g) WAMEX) (m+dhd+c+g+s+WA (m+chron+ENS) TiO2 vs Zr, Sm vs La, Ni/Cr map (m+c) ROX+WAMEX) Th vs Nb, Th vs YB; map (m) Intersecting faults m+c) Geochemical Komatiite rock age Alkaline rock age map (m+g) Mafic rock thickness Volcanic Talc abundance map anomaly map map Ni/Ti Map (m+c) Magnetic structure map (m+chron) Ultramafic map (m) map (m) model (m+c) (WAROX+WAMEX+s) (m+c+hydro) occurrence map (m+chron+ENS) complexity map (g) (m+dhd) Felsic volcanic rock age map (m+chron) Mg# map (m+c) Coeval (sulphidic) Geochemical Mafic classification anomaly soil map Rhyolite map (m) occurrence map map (m+c) Gravity structure (WAMEX+soil+c) Komatiite thickness complexity map (g) Alkaline rock (m+chron)

? map (m+g+dhd) Komatiite texture occurrence map map (m+c+WAROX) (m+c) BIF age and classification occurrence map Dacite map (m) map (m+c) Palaeocratonic (m+chron) boundary map (i) occurrence map (m+c) VMS age and occurrence map : Felsic volcanic rock (m+chron) age map (m+chron) Felsic volcanic rock occurrence map (m) occurrence map (m+c)

Quartz andesite m = mapping c = s = reflectance spectroscopy hydro = hydrochemistry data g = geophysical interpretation chron = WAMEX= WAMEX database/reports reg = regolith map map (m) occurrence map

i = isotopic ratios (e.g. Nd-Sm) dhd = drillhole database WAROX = WAROX database soil = soil map (m+c)

Mappable Proxies Mappable Which layers are needed and how are they created they how are and needed are layers Which Blue text = geological proxy layer available in the Atlas [hyperlinked] Recommended reference = Geological Survey of Western Australia 2019, Mineral Systems Atlas: Komatiite Hosted Nickel system, Department of Mines, Industry Regulations and Safety, accessed date, Scale of use: Terrane vs District