The Woodlawn deposit is a stratiform volcanogenic massive sulphide (VMS) deposit that is hosted within the central part of the mid Silurian to early Devonian Goulburn Basin: a deep water, back-arc basin which developed within Ordovician to early Silurian sediments of the Lachlan Fold Belt that hosts numerous metalliferous deposits. Woodlawn lies on the eastern limb of the asymmetric north-northwest plunging Woodlawn Syncline.

Base metal (zinc, lead, copper) and precious (silver, gold) mineralisation is hosted within regionally metamorphosed (greenschist facies) fine- to coarse-grained felsic to intermediate volcanic rocks, volcanogenic sedimentary rocks and minor carbonaceous shale, known as the Woodlawn Volcanics.

The Woodlawn deposit comprises three mineralised horizons (Lower, Middle and Upper) hosting 13 known massive sulphide lenses within a 400 m × 600 m wide and 950 m deep northwest plunging corridor which remains open at depth. Across-strike widths vary from 1 m to <35 m.

The updated and new domains occur within the Lower, Middle and Upper horizons. New domains were assigned to Lower, Middle and Upper horizons based on spatial orientation and proximity to known lenses. Updated domains comprised massive sulphide and stringer mineralisation extensions laterally or down plunge within B,C, D, J, H and I lenses.

Exploration drilling by Develop targeting extensions to the north of existing corridor has resulted in the discovery a ........

Woodlawn underground mine is currently at a restart phase having been on care and maintenance since March 2020.

Optimisations have been completed by Develop Global to generate a detailed mine design and schedule. The mining method selected is longhole stoping with backfill using paste fill as the main method for backfilling with some requirements for cemented rockfill (CRF) and rockfill in the lower levels of Kate Lens during start-up re-commissioning of the pastefill system. Stope access and extraction is a combination of longitudinal and transverse orientation. Stoping is primarily top-down but some instances of bottom-up sequencing exist.

The majority of the mine development is planned to access stopes as end on and retreat stoping to abutments, the exception to this is the Kate lens where central access drives have been designed where stoping will be mined to a retreating pillar.

Ore is scheduled from a combination of new and remnant areas. The ore will be truck to surface then transferred 2.1km overland to the processing plant.

Significant changes in decline strategy from previous studies is incorporated into the current mine plan planning. Scheduling of the mine plan capital development and production areas are now decoupled with decline development ~200 vertical metres ahead of the stoping front. Decline path has been adjusted away from remnant areas and access the historic workings will be from new development.

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