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Australia
Cracow Operation

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 Location:
0 km from Cracow, Queensland, Australia

  Address:
Level 2, HQ South Tower, 520 Wickham Street
Brisbane
Queensland, Australia
4006
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WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Bench stoping
  • Transverse stoping
  • Avoca
  • Uppers Retreat
  • Cemented backfill
  • Dry waste backfill
Production Start...
Mine Life4 years (as of Jan 1, 2022)


Owners

Source: p. 56
CompanyInterestOwnership
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 hosted in steeply dipp ........


Mining Methods

  • Bench stoping
  • Transverse stoping
  • Avoca
  • Uppers Retreat
  • Cemented backfill
  • Dry waste backfill


Summary:

Mining activities during the financial year were focused on improving development and backfilling rates, testing the limits of mining capacity. The mining method used at 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. 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 kilometres 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 ensure maximum recovery. Design parameters are: o Minimum mining width = 1.5m. This width has been achieved utilising a zipper pattern. Widths equal to or greater than 1.8m are mined with di ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required9089
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required560 kt537 kt529 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required573 kt529 kt540 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required550 kt550 kt550 kt
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Reserves at June 30, 2022:
Cracow Operation Mineral Resource figures are reported at a 1.5 g/t gold cut-off on a block by block basis.

Ore Reserve cut-off grade varies moderately depending on the estimated cost to extract a stope. The median cut-off grade applied is 2g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 199 kt Gold 4 g/t 26 koz
Probable 622 kt Gold 3.3 g/t 67 koz
Proven & Probable 821 kt Gold 3.5 g/t 92 koz
Measured 401 kt Gold 4.7 g/t 61 koz
Measured 401 kt Silver 3.8 g/t 49 koz
Indicated 1,885 kt Gold 4.1 g/t 247 koz
Indicated 1,885 kt Silver 3 g/t 183 koz
Inferred 1,893 kt Gold 2.4 g/t 147 koz
Inferred 1,893 kt Silver 2 g/t 121 koz
Total Resource 4,179 kt Gold 3.4 g/t 455 koz
Total Resource 4,179 kt Silver 2.6 g/t 353 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required -9 / oz   -10 / oz  
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required† 762 / oz†   746 / oz†  
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required† 769 / oz†   751 / oz†  
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,181 / oz†   1,123 / oz†  
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,269 / oz†   1,208 / oz†  
† Net of By-Product.
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M AUD  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 19.6   17.5  
Growth Capital M AUD  ......  Subscription required  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required 34.1   14.2  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 147.7   146.1  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 70.2   71.6  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required 70.8  
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Heavy Mobile Equipment as of December 31, 2019:
HME TypeModelQuantity
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Explosives Charger ....................... Subscription required ....................... Subscription required
Explosives Charger ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Truck (fuel / lube) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 23, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 23, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 23, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 23, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 23, 2022
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Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Corporate Presentation 2022
Financial Review 2022
Press Release 2022
Press Release 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Fact Sheet 2017
Annual Report 2016
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