Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Room-and-pillar
- Longhole open stoping
- Transverse stoping
- Longhole stoping
- Sub-level stoping
- Cemented paste backfill
|
Production Start | ... |
Mine Life | 2034 |
The major components of the Granny Smith operation are: • The Wallaby underground mine. • A carbon-in-pulp (CIP) processing facility. • A tailings storage facility (TSF). • A hybrid power station.
The PFS for the Zone 150 lode was completed in 2023. Initial infrastructure development is planned to start in 2025. |
Source:
p. 294,475
The Granny Smith Gold Mine (GSM) is owned by GSM Mining Company Pty Ltd a wholly owned subsidiary of Gold Fields Ltd.
Contractors
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Deposit Type
- Vein / narrow vein
- Orogenic
- Conglomerate hosted
- Breccia pipe / Stockwork
Summary:
There are two distinctly different types of basin successions; one forming linear geometries such as the Mt Lucky Conglomerate, and a second type; the Wallaby Conglomerate, that wraps around the southern margin of the Mt Margaret Dome.
Mineralisation
Granny Smith corridor
The Granny Smith gold deposits (including the Windich, Granny and Goanna lodes) occur along a north-trending structural corridor. The eastern contact zone of a granitoid intrusion within the metasedimentary rocks is the locus of the Granny Smith corridor mineralisation. The metasedimentary rocks consist of quartz-rich greywacke, lithic wacke and minor shale, and sandstone interbeds, with a basal conglomerate of clasts of shale, quartz, quartzite, banded iron formation (BIF) and feldspar-phyric volcanic rocks.
The Granny Smith granodiorite is a small (2 km × 5 km) elongate pluton which is porphyritic and has mafic-rich margins. Aplitic pegmatite dykes, which only cut the granitoid, represent the last magmatic phase. The present erosional level is close to the roof of the pluton, and in places has a thin cap of sedimentary rocks.
The pluton is surrounded by a 200 m-300 m wide contact metamorphic aureole that is progressively zoned from the granitoid contact outwards through a several metres-wide hornfelsed margin, to an andalusite-bearing slate, and finally to a slate with mica spots. Intrusive breccias and miarolitic cavities suggest a high-level intrusion, where a volatile phase was exsolved from the mag ........
Mining Methods
- Room-and-pillar
- Longhole open stoping
- Transverse stoping
- Longhole stoping
- Sub-level stoping
- Cemented paste backfill
Summary:
The Wallaby Project area is located west of Granny Smith Gold mine on the edge of Lake Carey. Open pit production commenced in 2001 and ended in 2006. The underground mining operation commenced in 2004 and is currently the only active mining at Granny Smith Gold mine.
Wallaby underground is accessed via a decline, and mining methods include room and pillar, bulk stopes and long-hole open stoping. The Zone 150 stopes reflect the deepest mining in the LOM plan at Wallaby between 1,500m and 2,000m below surface. Ground support, pillars and paste fill are designed to manage seismic activity. Operations utilise owner mining. Ore is transported to the processing plant from the decline portal by road.
Due to the variable sub-horizontal nature of the orebody, the mining methods at Wallaby underground mine involves a variation of a long-hole room and pillar methodology with no backfill in upper levels (above Z100 level) and hybrid of long-hole room and pillar with and without paste fill below Z100 level. The main mining method at Wallaby underground mine is inclined room and pillar (IRP). Other methods utilised are transverse long-hole stoping (TLHS) and sub-level long-hole stoping (SLHS).
Inclined room and pillar (IRP)
IRP is used in areas of moderate ore dip (10°-45°) and moderate ore width (4 m-6 m). Multiple ore drives are developed on a fixed gradient to traverse the ore lenses following the ore contour on that elevation. Stoping is ca ........
Source:
Source:
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Flow Sheet:
Summary:
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Source:
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Reserves at December 31, 2023:
Mineral Resources cut-off for open pit 0.89 g/t;
Mineral Resources cut-off for underground 2.1 – 3.5 g/t;
Mineral Reserves cut-off for underground 3.1 – 4.0 g/t.
Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
Stockpiles
|
21 kt
|
Gold
|
5.7 g/t
|
4 koz
|
Proven
|
In-Situ (UG)
|
1,490 kt
|
Gold
|
5.7 g/t
|
271 koz
|
Proven
|
Total
|
1,511 kt
|
Gold
|
5.7 g/t
|
275 koz
|
Probable
|
In-Situ (UG)
|
10,459 kt
|
Gold
|
6.3 g/t
|
2,116 koz
|
Proven & Probable
|
Stockpiles
|
21 kt
|
Gold
|
5.7 g/t
|
4 koz
|
Proven & Probable
|
In-Situ (UG)
|
11,949 kt
|
Gold
|
6.2 g/t
|
2,386 koz
|
Proven & Probable
|
Total
|
11,970 kt
|
Gold
|
6.2 g/t
|
2,390 koz
|
Measured
|
In-Situ (UG)
|
2,161 kt
|
Gold
|
5.2 g/t
|
359 koz
|
Indicated
|
In-Situ (UG)
|
13,157 kt
|
Gold
|
4.6 g/t
|
1,925 koz
|
Measured & Indicated
|
In-Situ (UG)
|
15,318 kt
|
Gold
|
4.6 g/t
|
2,284 koz
|
Inferred
|
In-Situ (OP)
|
271 kt
|
Gold
|
2.07 g/t
|
18 koz
|
Inferred
|
In-Situ (UG)
|
7,889 kt
|
Gold
|
5.2 g/t
|
1,327 koz
|
Inferred
|
Total
|
8,160 kt
|
Gold
|
5.1 g/t
|
1,345 koz
|
Corporate Filings & Presentations:
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