Overview
Stage | Permitting |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Transverse stoping
- Longitudinal stoping
- Longhole stoping
- Cemented paste backfill
- Cemented rockfill
|
Mine Life | 8 years (as of Jan 1, 2023) |
The 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). |
Source:
p. 29
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.
Contractors
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Summary:
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 l ........
Mining Methods
- Transverse stoping
- Longitudinal stoping
- Longhole stoping
- Cemented paste backfill
- Cemented rockfill
Summary:
One of the most material project design changes since the 2018 study is the shift from open pit to a 100% underground operation.
The assumed mining method for the deposit is a mixture of overhand and underhand long-hole stoping with cemented paste fill as the main method for backfilling with some requirements for cemented rockfill (CRF) in the upper levels during start-up commissioning of the pastefill system. Tailings forms a large part of the paste fill mix.
The underground mine is planned to be accessed via a boxcut positioned at 1,250 mRL adjacent to the processing process plant and run of mine (ROM) pad. A decline will be developed from the boxcut portal down first reaching the East zone level access after a chainage distance of 320 m, or 45 m vertically. The decline was designed on the southern (FW) side of the orebody and to the east of the breccia Main Fault to reduce ground control issues.
A separate access was designed for each zone level. Stoping is planned to be a mixture of transverse and longitudinal retreat depending on ore body geometry. On those levels which have transverse stoping, a footwall drive was designed to provide across strike access.
An undiluted minimum mining width (MMW) of 3.0 m was applied to all stope designs. 0.5 m of unplanned dilution was applied to stope hangingwalls and 0.5 m to stope footwalls. This dilution was added in the stope design stage and not as a factor in the schedule. As a result, ........
Source:
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Flow Sheet:
Summary:
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Reserves at June 2, 2023:
The NSR cut-off grade used for reporting of Mineral Resources at Sulphur Springs was A$80/t.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
8.8 Mt
|
Copper
|
1.1 %
|
100 kt
|
Probable
|
8.8 Mt
|
Zinc
|
5.4 %
|
479 kt
|
Probable
|
8.8 Mt
|
Lead
|
0.2 %
|
22 kt
|
Probable
|
8.8 Mt
|
Silver
|
20.6 g/t
|
5,818 koz
|
Probable
|
8.8 Mt
|
Gold
|
0.1 g/t
|
38 koz
|
Indicated
|
12,398 kt
|
Copper
|
1.2 %
|
|
Indicated
|
12,398 kt
|
Zinc
|
5.6 %
|
|
Indicated
|
12,398 kt
|
Lead
|
0.3 %
|
|
Indicated
|
12,398 kt
|
Silver
|
21.8 g/t
|
|
Indicated
|
12,398 kt
|
Gold
|
0.1 g/t
|
|
Inferred
|
1,401 kt
|
Copper
|
0.2 %
|
|
Inferred
|
1,401 kt
|
Zinc
|
6.4 %
|
|
Inferred
|
1,401 kt
|
Lead
|
0.5 %
|
|
Inferred
|
1,401 kt
|
Silver
|
38.4 g/t
|
|
Inferred
|
1,401 kt
|
Gold
|
0.2 g/t
|
|
Total Resource
|
13,798 kt
|
Copper
|
1.1 %
|
|
Total Resource
|
13,798 kt
|
Zinc
|
5.7 %
|
|
Total Resource
|
13,798 kt
|
Lead
|
0.3 %
|
|
Total Resource
|
13,798 kt
|
Silver
|
23.5 g/t
|
|
Total Resource
|
13,798 kt
|
Gold
|
0.2 g/t
|
|
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