BHP owns 100% of the West Musgrave Project, having acquired it as a part of OZ Minerals.
On May 2, 2023, BHP announced the completion of the OZ Minerals acquisition and implementation of the scheme of arrangement for BHP Lonsdale Investments Pty Limited, a wholly owned subsidiary of BHP Group Limited, to acquire 100% of the shares in OZ Minerals Limited (OZL) (the Scheme). BHP Group Limited is now the ultimate parent company of OZL.
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Summary:
The Nebo-Babel deposits are both hosted by a sub-horizontal, tube-shaped mafic intrusion which is classified as a gabbronorite. The mafic intrusion has a known extent of 5 kilometres, trends in an easterly direction, has a gentle 15 degree dip to the south and, in the case of Babel, a less than 10 degree plunge toward the southwest. Babel and Nebo are separated by the steeply-dipping, north-south trending Jameson Fault. Babel occurs to the west of the fault and Nebo occurs to the east.
Babel consists of three main lithostratigraphic units, which are variably textured leucogabbronorite (VLGN) that forms the outer shell around mineralised gabbronorite (MGN), and barren gabbronorite (BGN) in the core of the intrusion. At Nebo, the main lithostratigraphic units are VLGN that forms an outer shell of the intrusion around barren gabbronorite, and oxide-apatite gabbronorite, which occurs in the core of the intrusion at the eastern end.
The Nebo-Babel deposits contain two main styles of mineralisation: disseminated gabbronorite-hosted sulphides, which represent the bulk of the mineralisation, and massive and breccia sulphides, which are a comparatively minor component of the overall sulphide inventory.
Interpretation and wireframes have been constructed for lithology (including dykes), weathering and estimation grade domains. Mineralisation is intimately associated with the brecciated contact of the gabbronorite intrusive into the surrounding orthogneiss host rock and, although there is a strong, almost exclusive relationship between lithology and mineralisation, it was determined to construct estimation grade domains to optimise the estimation. At Nebo, ’high-grade’ domains were constructed to model Massive Sulphide zones where continuity could be interpreted between sections and drill holes. Weathering surfaces were constructed for Oxide (OX), Pyrite-Violarite (PV), Transitional (TR) and Primary (PR) zones.
Dimensions
The Nebo Mineral Resource is contained within an area defined by a strike length of 1,670 m and across-strike width of 1,500 m. Mineral Resources have been reported within a defined potentially economic pit shell that has a maximum depth of 230 m below surface.
The Babel Mineral Resource is contained within an area defined by a strike length of 2,440 m and across-strike width of 1,665 m. Mineral Resources have been reported within a defined potentially economic pit shell that has a maximum depth of 580 m below the surface.