Copied this on their website about the Tanami/Browns Range...

Copied this on their website about the Tanami/Browns Range project.
A few familiar words: Killi Killi


The project area covers the eastern extent of both the Palaeoproterozoic Tanami Complex and Lower-Mid Proterozoic sedimentary rocks of the Birrindudu-Victoria Basin.

Deformed granitoids and sedimentary rocks of the 1,800 - 1,850 Ma old Ware Group (sandstones and volcaniclastics) and the Killi Killi Formation comprise most of the Tanami Complex known to occur in the project area, which are unconformably overlain by sandstones, grits and conglomerates (including the Gardiner and Pargee Sandstone members) of the Lower Proterozoic ( 1,700 - 1,750 Ma) Birrindudu-Victoria Basin.

Deposition in the Birrindudu Basin began with sandstone transgressing over metamorphic and crystalline basement (Tanami Complex) around 1,700 Ma. Transgression was associated with regionally extensive north-trending growth faults and volcanism, which may indicate rifting. The Birrindudu and Tolmer Groups represent the exposed section of this basin and may be up to 6,000m thick locally. These units are dominated by coarse clastic sedimentary rocks with minor felsic volcanics (tentatively assigned to undifferentiated Birrindudu Group) and carbonate rocks and minor shale of the upper Tolmer Group.

The Gardiner Range Sandstone is a flat-lying sequence starting with a basal conglomerate which passes upwards into a series of feldspathic sandstones and grits. This lower sandstone unit is overlain by a sequence of flaggy sandstones and grits.

Overlying the basal Birrindudu Group is a a thick package of predominantly siliciclastic and carbonate rocks, with minor shales and mudstones.

Areas of the project, particularly those underlain by Lower Proterozoic rocks are covered by surficial deposits, including alluvium and wind-blown sand. The plateau areas which are underlain by the Gardiner Formation are frequently capped by a silcrete layer of variable thickness. Such areas may have hindered exploration in the past by masking potential zones of mineralisation.

The unconformity between the Tanami Complex and the Lower Proterozoic sedimentary rocks is partially concealed in the central project area by mafic volcanics and sedimentary rocks assigned to the Cambrian Wiso Basin.