Summary

Mine Type	Open Pit
Study Completed	Feasibility
Study in Progress	Feasibility Update
Stage	Construction
Commodities	Lead Zinc Silver
Mining Method	Truck & Shovel / Loader
Project Timeline	...
Mine Life	...
Snapshot	The Sorby Hills Lead-Silver-Zinc Project is the largest undeveloped, near-surface Lead-Silver-Zinc deposit in Australia. The Project comprises granted mining leases covering six known Lead-Silver-Zinc deposits. The Study proposes the open-pit mining and processing of ore from five of the six Sorby Hills deposits, namely: Omega, A, B, Beta, and Norton. As of December 2025, the Final Investment Decision has been made, and on-site early works have commenced. Initial works include: • Construction of site access roads; • Establishment of foundations for the processing plant and accommodation camp. All major components for the Sorby Hills Process Plant have been secured via the DeGrussa Process Plant acquisition. In Q1 2026, Boab Metals plans to complete on-site early works, receive final regulatory approvals, and commence dismantling and relocation of the processing plant from DeGrussa to Sorby Hills.

Deposit type

• Mississippi Valley Type
• Carbonate replacement
• Stratabound

Summary:

The Sorby Hills mineralisation is classified as Mississippi Valley Type (“MVT”), implying replacement of carbonate and mixed carbonate siliciclasitic rocks by Pb-Ag-Zn-Fe sulphides. Recent geological assessment has refined this to a sediment-replacement system, with mineralisation focused within an interval below the base of the Knox Sediments and the Sorby Dolomite (Transition Facies). The Late Devonian/Early Carboniferous host rock succession was transgressively deposited over the flanks of a Precambrian basement-high (Pincombe Inlier) that extended into the Burt Range Sub-basin which is part of the southern Bonaparte Basin.

The mineralisation is largely stratabound and hosted mainly in the Transition Facies, an interval of about 20 to 25m consisting of 1 to 2m thick cyclic bedded, beds of massive dolomite, silty dolomite and clay matrix breccias in the immediate footwall of the Knox Sediments and the uppermost interval of the Sorby Dolomite. A massive micritic fossiliferous dolomite interval is located in the hanging wall. Strata generally dip shallowly, but variably to the east, southeast and northeast. The mineralisation consists of seven discrete carbonate-hosted Pb-Ag-Zn deposits: A, B, Omega, Norton, Beta and Alpha (Pb and Zn) deposits. The deposits form a curvilinear north-trending belt extending over 7km, sub-parallel to the eastern margin of the Precambrian Pincombe Inlier with sub economic mineralisation linking all deposits.

Mining Methods

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Comminution

Crushers and Mills

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Processing

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Commodity Production

Operational metrics

Metrics
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Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Jan 9, 2026
.......................	.......................		Jan 9, 2026