Overview
Stage | Restarting |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole stoping
- Transverse open stoping
- Longitudinal stoping
- Cemented backfill
- Paste backfill
|
Mine Life | 7 years (as of Jan 1, 2023) |
Woodlawn underground mine and new processing plant/site infrastructure are currently under care and maintenance (since March 2020).
In 2022, Develop Global Ltd. acquired the Woodlawn copper-zinc project. The project is currently at a restart phase.
The Woodlawn mine plan update, released on September 12, 2023 and further amended on September 27, 2023, was based on a 7.2Mt of the Mineral Resource, a 5.1Mt mineral inventory of which the Reserves were 66% or 3.4Mt of the inventory, didn’t include the substantial increase in Resource in the October 2023 estimate. The updated Woodlawn Mineral Resource Estimate of 10.3Mt will feed into the final mine plan used for the Final Investment Decision on the restart of production, in March quarter 2024.
Pre-production activities will continue to de-risk the project even further. Capital development and production fronts are now decoupled with decline development ~200 vertical meters ahead of the production levels. |
Latest News | Develop Global Ltd.: Woodlawn Resource increases by 40%, paving way for +10-year mine life October 11, 2023 |
Source:
p. 8
The Woodlawn Project is 100% owned by Develop through its subsidiaries Tarago Operations Pty Ltd, Tarago Exploration Pty Ltd and Ochre Resources Pty Ltd. The Project comprises one mining lease and ten exploration licences.
Contractors
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Deposit Type
- Tailings
- Vein / narrow vein
- VMS
Summary:
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 ........

Mining Methods
- Longhole stoping
- Transverse open stoping
- Longitudinal stoping
- Cemented backfill
- Paste backfill
Summary:
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.
Th ........

Source:
Flow Sheet:
Summary:

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Reserves at October 11, 2023:
No change in the Ore Reserves estimation at Woodlawn project since August 2, 2022.
Woodlawn underground Zinc-Copper Mineral Resource, at NSR cut-off of A$100/t, with A$140/t used for remnant lenses.
Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
In-Situ (UG)
|
3.4 Mt
|
Zinc
|
3.8 %
|
131 kt
|
Probable
|
In-Situ (UG)
|
3.4 Mt
|
Copper
|
1.6 %
|
54 kt
|
Probable
|
In-Situ (UG)
|
3.4 Mt
|
Lead
|
1.3 %
|
44 kt
|
Probable
|
In-Situ (UG)
|
3.4 Mt
|
Gold
|
0.5 g/t
|
60 koz
|
Probable
|
In-Situ (UG)
|
3.4 Mt
|
Silver
|
31.7 g/t
|
3,462 koz
|
Measured
|
In-Situ (UG)
|
1,311 kt
|
Zinc
|
5.3 %
|
|
Measured
|
In-Situ (UG)
|
1,311 kt
|
Copper
|
2.3 %
|
|
Measured
|
In-Situ (UG)
|
1,311 kt
|
Lead
|
1.6 %
|
|
Measured
|
In-Situ (UG)
|
1,311 kt
|
Gold
|
0.9 g/t
|
|
Measured
|
In-Situ (UG)
|
1,311 kt
|
Silver
|
48.5 g/t
|
|
Indicated
|
In-Situ (UG)
|
5,918 kt
|
Zinc
|
4.9 %
|
|
Indicated
|
In-Situ (UG)
|
5,918 kt
|
Lead
|
1.7 %
|
|
Indicated
|
In-Situ (UG)
|
5,918 kt
|
Gold
|
0.4 g/t
|
|
Indicated
|
In-Situ (UG)
|
5,918 kt
|
Silver
|
34.6 g/t
|
|
Inferred
|
In-Situ (UG)
|
3,045 kt
|
Zinc
|
8.7 %
|
|
Inferred
|
In-Situ (UG)
|
3,045 kt
|
Copper
|
1.6 %
|
|
Inferred
|
In-Situ (UG)
|
3,045 kt
|
Lead
|
3.4 %
|
|
Inferred
|
In-Situ (UG)
|
3,045 kt
|
Gold
|
0.5 g/t
|
|
Inferred
|
In-Situ (UG)
|
3,045 kt
|
Silver
|
71 g/t
|
|
Total Resource
|
In-Situ (UG)
|
10,273 kt
|
Zinc
|
6.1 %
|
|
Total Resource
|
In-Situ (UG)
|
10,273 kt
|
Copper
|
1.8 %
|
|
Total Resource
|
In-Situ (UG)
|
10,273 kt
|
Lead
|
2.2 %
|
|
Total Resource
|
In-Situ (UG)
|
10,273 kt
|
Gold
|
0.5 g/t
|
|
Total Resource
|
In-Situ (UG)
|
10,273 kt
|
Silver
|
47.2 g/t
|
|
Source:

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