Proterozoic geology and mineralisation of the Greenmount Cu-Au-Co deposit, Cloncurry District

TL;DRAbstract

The Greenmount deposit is hosted by mid-Proterozoic graphitic and carbonaceous slates of the Marimo Slate near the contact with the calcareous and evaporitic metasediments of the Staveley Formation in the southern Marimo Basin, some 40 km south of Cloncurry. A diorite intrudes the sequence and is altered and veined but not mineralised. Late brittle faults fragmented the geology and earlier tight D2 folds. The area around Greenmount is particularly disjointed and structurally complex. Alteration and mineralisation was localised in a \flat\" ramp within a reverse fault/shear regime and veining and mineralisation was in a dominantly brittle to brittle-ductile regime. The Marimo Slate the Staveley Formation and the diorite underwent alkali-rich metasomatism dominated by microcline with subordinate albite sericite (retrogressed microcline) and lesser hematite rutile tourmaline quartz dolomite ± sulphides ± magnetite. Episodic veining comprises a stockwork of millimetre to metre wide v

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