Sulphur Springs Project

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Mine TypeUnderground
  • Copper
  • Zinc
  • Lead
  • Silver
  • Gold
Mining Method
  • Transverse stoping
  • Longitudinal stoping
  • Longhole stoping
Backfill type ... Lock
Mine Life... Lock
SnapshotThe Updated DFS of the Sulphur Springs Zinc-Copper project was released on June 30, 2023. The Updated DFS reflects the fundamentally different development and operational strategy adopted by Develop compared with that which underpinned the 2018 DFS. The planned Sulphur Springs open pit in oxide and transitional material and satellite Kangaroo Caves deposit, which were in the 2018 DFS, have been removed from the Updated DFS.

New mine plan based on underground mining only, with potential for small pit at end of life.

All major project approvals have been granted (Ministerial environmental approval, Mining Proposal and Mine Closure plan).


DEVELOP Global Ltd. 100 % Indirect
The registered owner of the tenement is Venturex Sulphur Springs Pty Ltd, a wholly owned subsidiary of Develop Global Ltd. The prospects are held by Venturex Sulphur Springs Pty Ltd.

Deposit type

  • VMS


The Sulphur Springs deposit has been classified as a volcanogenic massive sulphide (VMS) zinc-copper deposit located within the Sulphur Springs Group in the central east of the Archaean Pilbara Craton. The Sulphur Springs Group lies within a north–northeasterly trending litho-tectonic zone known as the Lalla Rookh-Western Shaw Structural Corridor (LWSC) that is bound by regional-scale faults.

At the prospect scale, deposit lithologies and base metal mineralisation lies within the upper part of the Kangaroo Caves Formation. Local geology comprises polymictic breccia, chert, massive and stringer sulphide mineralisation, and felsic volcanic rocks of dacitic composition.

At deposit scale, Sulphur Springs deposit lithologies intersected in drill holes comprise polymictic breccia, chert, massive and stringer sulphide mineralisation, and felsic volcanic rocks of dacitic composition. Massive pyrite and base metal mineralisation occurs over a 550 m strike length and 600 m down dip extent, and consists of an upper zone of massive sulphide overlying a disseminated/stringer (disseminated) zone. The upper contact of the massive sulphide unit is generally sharp, while the lower contact with the footwall disseminated zone is diffuse, with gradational metal tenor over several metres. There are indications of structural thickening in some mineralisation areas, which has obscured primary morphology and metal zonation.

Massive sulphide horizon widths vary from less than 2 m at the periphery to greater than 50 m in the central part of the east and west lenses, whereas the lower disseminated stringer zone has more variable widths between 2 m and 20 m.

The following major mineralisation styles and relationships are recognised:
- Zinc-rich mineralisation is most prominent towards the hangingwall of the massive sulphide. Discrete zones of zinc occur towards the footwall of the massive sulphide and are interpreted to be structural emplacement. Lower tenor zinc-rich mineralisation is also defined within the footwall.
- Copper-rich mineralisation is most prominent towards the footwall of the massive and upper disseminated area of sulphide mineralisation.
- Hangingwall zinc mineralisation that lies 10–40 m above the massive sulphide is interpreted to be structural repetition of the massive sulphides. There is low marker breccia below the hangingwall mineralisation that is interpreted as localised thrust faulting.

The principal zinc mineral is a pale brown–coloured, iron-poor sphalerite occurring as fine-grained disseminations throughout the sulphide mineralisation, but is preferentially concentrated with pyrite in massive sulphide lenses towards the hangingwall of the massive sulphides. Finegrained galena occurs as discrete, localised mineralisation.

Sulphide mineralisation is offset by a steeply dipping north–south oriented fault (Main fault) which divides the mineralisation into the east and west lenses.

Drill holes intersecting the Main fault area show significant intersections of breccia, which is interpreted to be growth fault breccia that is not mineralised.



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Mining Methods


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Crushers and Mills


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CommodityUnitsAvg. AnnualLOM
Zinc kt 52415
Silver koz 3112,488
All production numbers are expressed as payable metal.

Operational metrics

Annual ore mining rate  ....  Subscribe
Annual processing rate  ....  Subscribe
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Ore tonnes mined, LOM  ....  Subscribe
Tonnes processed, LOM  ....  Subscribe
* According to 2023 study.

Production Costs

Assumed price Zinc USD  ....  Subscribe
Assumed price Copper USD  ....  Subscribe
Assumed price Silver USD  ....  Subscribe
* According to 2023 study / presentation.

Operating Costs

UG mining costs ($/t milled) AUD 52.3 *  
Processing costs ($/t milled) AUD  ....  Subscribe
G&A ($/t milled) AUD  ....  Subscribe
Total operating costs ($/t milled) AUD  ....  Subscribe
* According to 2023 study.

Project Costs

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscribe
Sustaining CapEx $M AUD  ......  Subscribe
Total CapEx $M AUD  ......  Subscribe
UG OpEx $M AUD  ......  Subscribe
Processing OpEx $M AUD 504.9
Refining and treatment costs $M AUD  ......  Subscribe
Transportation (haulage) costs $M AUD 172.3
G&A costs $M AUD 35.3
Total OpEx $M AUD  ......  Subscribe
Royalty payments $M AUD  ......  Subscribe
Gross revenue (LOM) $M AUD  ......  Subscribe
Net revenue (LOM) $M AUD  ......  Subscribe
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscribe
Pre-tax NPV @ 5% $M AUD  ......  Subscribe
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Heavy Mobile Equipment

Fleet data has not been reported.


Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 13, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 13, 2023


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