Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Avoca
- Bench stoping
- Transverse stoping
- Uppers Retreat
- Open stoping
- Unconsolidated rockfill
|
Production Start | ... |
Mine Life | 2026 |
Cracow Gold Operations is an established underground gold operation. The Cracow gold mine ore is treated at the existing Cracow ore processing plant located close to the mine portal. Gold and silver metal are recovered to a doré bar by cyanide leach methods.
Cracow will be investing significant growth capital on a tailings dam lift in the first half of FY24 to add an additional 3 years capacity. |
Source:
p. 57,71
Company | Interest | Ownership |
Aeris Resources Ltd.
|
100 %
|
Indirect
|
Lion Mining Pty Ltd.
(operator)
|
100 %
|
Direct
|
On 1 July 2020, Aeris Resources Limited, through its wholly owned subsidiary Aeris Regional Holdings Pty Ltd, acquired 100% of the issued shares in Lion Mining Pty Ltd, owner and operator of the Cracow Gold Operations (Cracow).
Contractors
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Deposit Type
- Vein / narrow vein
- Epithermal
- Breccia pipe / Stockwork
Summary:
Gold mineralisation within the Cracow field forms along various broadly north-south striking corridors. Historical gold mining focused on the Golden Plateau deposit which yielded over 850 thousand ounces of gold between 1932 to 1992. Current underground mining, referred to as the Western Vein Field, is located immediately west of Golden Plateau.
The Cracow project area gold deposits are in the Lower Permian Camboon Andesite on the south-eastern flank of the Bowen Basin. The regional strike is north-northwest and the dip 20° west-southwest. The Camboon Andesite consists of andesitic and basaltic lava, with agglomerate, tuff and some inter bedded trachytic volcanics. The andesitic lavas are typically porphyritic, with phenocrysts of plagioclase feldspar (oligoclase or andesine) and less commonly augite. To the west, the Camboon Andesite is overlain with an interpreted disconformity by fossiliferous limestone of the Buffel Formation. It is unconformably underlain to the east by the Torsdale Beds, which consist of rhyolitic and dacitic lavas and pyroclastics with inter-bedded trachytic and andesitic volcanics, sandstone, siltstone, and conglomerate.
Gold mineralisation at the Cracow Operation is hosted in the Lower Permian Camboon Volcanics (intermediate volcanics) on the south-eastern flank of the Bowen Basin. The Camboon Volcanics consists of andesitic and basaltic lava, with agglomerate, tuff and inter-bedded trachytic volcanics. Gold mineralisation is ho ........
Mining Methods
- Avoca
- Bench stoping
- Transverse stoping
- Uppers Retreat
- Open stoping
- Unconsolidated rockfill
Summary:
Cracow has multiple ore bodies accessed by a single decline to the surface and mined via open stoping through a modified Avoca mining sequence.
The mining method used at the Cracow gold mine is underground mining with backfill. A variety of stoping methods are used. The most common method is bench stoping with dry backfill with an upwards extraction sequence known as modified Avoca.
Underground mining methods are bench stoping with backfill (Modified Avoca) and up-hole retreat stoping without backfill.
There are 15 separate deposits being mined, all by underground methods. The Ore Reserve estimate reported is a consolidation of the estimates for the fifteen deposits. Fourteen of the deposits are accessed via the Cracow mine infrastructure. The Roses Pride mine infrastructure is three kilometers to the North of the main Cracow mine.
Several mining methods are used for the extraction of stopes at Cracow:
• Modified Avoca. This is the primary method of extraction at Cracow. A bottom-up extraction method. Stopes are backfilled with dry rockfill;
• Uphole retreat. A method used on the top level of an orebody or in a sill pillar. Stopes remain open as there is no backfill horizon;
• Benching. Used on the bottom level of an orebody to extract ore that would not be economical to mine conventionally (capital costs associated with another level below); and
• Transverse stoping. A method used in wider (>15m) areas to ensu ........
Source:
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Flow Sheet:
Summary:
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Source:
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Reserves at December 31, 2022:
Cracow Operation Mineral Resource figures are reported at a 1.5 g/t gold cut-off on a block-by-block basis.
Cracow Operation Ore Reserve figures are reported at a range of gold cut-off grades between 2.2 g/t to 3.0g/t gold depending on the deposit and mining method.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
230 kt
|
Gold
|
3.7 g/t
|
27 koz
|
Probable
|
360 kt
|
Gold
|
3.5 g/t
|
41 koz
|
Proven & Probable
|
590 kt
|
Gold
|
3.6 g/t
|
68 koz
|
Measured
|
550 kt
|
Gold
|
4.1 g/t
|
73 koz
|
Measured
|
550 kt
|
Silver
|
3 g/t
|
60 koz
|
Indicated
|
1,900 kt
|
Gold
|
4 g/t
|
241 koz
|
Indicated
|
1,900 kt
|
Silver
|
4 g/t
|
240 koz
|
Inferred
|
2,500 kt
|
Gold
|
2.6 g/t
|
212 koz
|
Inferred
|
2,500 kt
|
Silver
|
5 g/t
|
370 koz
|
Total Resource
|
4,900 kt
|
Gold
|
3.3 g/t
|
526 koz
|
Total Resource
|
4,900 kt
|
Silver
|
4 g/t
|
670 koz
|
Corporate Filings & Presentations:
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