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Location: 150 km SE from Port Hedland, Western Australia, Australia
Level 18, Raine Square, 300 Murray StreetPO Box 7071 Cloisters Square, WA 6850PerthWestern Australia, Australia6000
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Atlas Iron Limited was acquired by Hancock Prospecting Pty Ltd, through its wholly-owned subsidiary Redstone Corporation Pty Ltd in December 2018.
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The Mount Webber Project consists of three deposits:• Gibson/Daltons – one deposit split on a tenement boundary;• Fender – located to the southwest on the same banded iron formation (BIF) unit as Gibson/Daltons; and• Ibanez – located slightly to the west of Gibson on a parallel BIF outcrop.The Project is located within the Archaean age Granite greenstone terrane of the Pilbara Craton, with the deposits occurring within the Gorge Creek and Sulphur Springs Groups of the Pilbara Supergroup (Slomp, 2017). Complex folding and faulting have resulted from the deposits being located between two large granitoid complexes – the Shaw Granitoid Complex to the east and the Yule Granitoid Complex to the west (Hermawan, 2013).The deposits are hosted within the Pincunah Banded Iron Member (Hickman, 2013) of the Kangaroo Caves Formation. The Pincunah Banded Iron Member comprises red-black BIF, chert, tuff, siltstone and shale and is unconformably underlain by the Warrawoona Group mafic and ultramafic lithologies. The BIF and chert of the Pincunah Banded Iron Member form steep-sided ridges with flat-topped summits. The Pincunah Banded Iron Member has been informally divided into Upper and Lower BIF units separated by a thin chert unit.One dolerite intrusive has been identified in the Fender deposit that cuts the entire sequence, but this has had no apparent effect on the mineralisation.MineralisationThe mineralisation has been recorded as predominantly gœthite with minor hæmatite (Hermawan, 2013). The mineralisation occurs as lenses of varying sizes ranging from 10 m to 15 m wide to several hundred metres wide and over a kilometre long and occurs in both the Upper and Lower BIF units, although the majority is within the Upper BIF unit. The mineralisation in the Lower BIF unit is thought to be poddy and laterally inconsistent, and consequently of lower prospectivity. The mineralisation has a hard cap that varies from 10 m to 30 m in depth.It is believed by Atlas that the mineralisation was formed by supergene processes only. This is borne out by the grade and distribution of the bulk of the mineralisation. However, a brief review of the chemistry of Gibson/Daltons revealed the presence of mineralisation that may have a different origin. The overall iron grade for the Gibson/Daltons resource (all categories) has been quoted as 57.9% Fe, 0.09% P and 8.3% LOI.The majority of the holes were between 40 m and 80 m deep, with several extending below 100 m. The deepest hole recorded was 120 m.A review of the Ibanez database revealed shallower holes, the majority ranging between 30 m and 60 m deep with several deeper than 100 m. The bulk of the mineralisation was goethitic, with minimal hæmatite. A few holes intersected higher grades, e.g. MWRC0933 which averaged 63.3% Fe, 0.094% P and 5.79% LOI for the 36 m intersection between 22 m and 58 m. This is most likely a martite-gœthite rather than having a metamorphic origin.The mineralisation occurs in synclinal fold closures where the BIF is thickened by intraformational folding, with the synclines corresponding to the topographic highs and the valleys to eroded antiformal hinges.
