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Australia
Cracow Mine

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 Location:
0 km from Cracow, Queensland, Australia

  Address:
Level 2, HQ South Tower, 520 Wickham Street
Brisbane
Queensland, Australia
4006
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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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
Processing
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2023
During the 2021 financial year, the Aeris Board approved the construction of a new multi-stage tailings storage facility at Cracow (TSF No.2). As at 30 June 2021 the construction was substantially complete and commissioning is targeted to occur in early August.
Latest NewsAeris emerges as buyer of Evolution’s Cracow gold mine     June 4, 2020


Owners

Source: p. 121
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).

Deposit Type

  • Vein / narrow vein
  • Epithermal
  • Breccia pipe / Stockwork


Summary:

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.

Mineralisation is hosted in steeply dipping low sulphidation epithermal veins. These veins found as discrete and as stockwork and are composed of quartz, carbonate and adularia, with varying percentages of each mineral. Vein textures include banding (colloform, crustiform, cockade, moss), breccia channels and massive quartz, and indicate depth within the epithermal system. Sulphide percentage in the veins are generally low (<3%) primarily composed of pyrite, with minor occurrences of hessite, sphalerite and galena. Rare chalcopyrite, arsenopyrite and bornite can also be found.

Alteration of the country rock can be extensive and zone from the central veined structure. This alteration consists of silicification, phyllic alteration (silica, sericite and other clay minerals) and argillic alteration in the inner zone, grading outwards to potassic (adularia) then an outer propylitic zone. Gold is very fined grained and found predominantly as electrum but less common within clots of pyrite.


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.

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.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 42" x 30" 1
Cone crusher ....................... Subscription required 4.25' 2
Ball mill ....................... Subscription required 4.0m x 5.9m 1400 kW 1
Ball mill ....................... Subscription required 2.9m x 4.3m 450 kW 1
Vertical mill / Tower ....................... Subscription required 500 kW 1

Summary:

The Cracow processing plant consists of a three-stage crushing circuit, primary and secondary ball milling.

Primary crushing/grinding plant/machinery:
- Jaw: Jaques 42x30;
- Secondary: 4 ¼ ft cone crushers;
- Tertiary: 4 ¼ ft cone crushers.

Grinding plant equipment:
- ML01: 4m x 5.9m Morgardshammer OFBM, 1400KW;
- ML02: 2.9 x 4.3 Morgardshammer OFBM, 450KW;
- HIG01: Outotec HIG500, 500kW.

Grinding media:
- 40mm and 60mm high chrome grinding balls (ball mills);
- 3mm ceramic beads (HIG mill).

Screening plant/equipment:
-Jaques Torrens double deck screen, top deck passing
-24mm, bottom deck passing 10mm


Processing

  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Cracow ore processing plant achieved annual 603,000 tonnes - (exceeding the previous assumed limit of 570,000 tonnes per annum) and monthly (57,100 tonnes) throughput records in FY2021. These records were achieved with minor capital expenditure on debottlenecking of the processing plant, particularly in the crushing circuit. The proved higher processing capacity is a factor in extending the life of Cracow as it enables lower gold cut-off grades to be contemplated.

During the year construction of a new multi-stage tailings storage facility at Cracow (TSF No.2) commenced. Cracow is currently discharging tailings into Tailing Storage Facility No.1 (TSF No.1), which has reached its maximum allowable construction height.

CRACOW ORE PROCESSING PLANT
The Cracow processing plant consists of a three-stage crushing circuit, primary and secondary ball milling, pre-leach thickening, fine grinding and conventional cyanidation leaching (CIP).

-Ore treatment/pro ........

Recoveries & Grades:

CommodityParameter202120202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required94.394.693.1
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required5.635.455.92

Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required908991
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required560 kt537 kt529 kt499 kt
Tonnes processed  ......  Subscription required  ......  Subscription required573 kt529 kt540 kt511 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required550 kt550 kt550 kt550 kt
Subscription required - Subscription is required.

Reserves at June 30, 2021:
Mineral Resource cut-off grade 1.5g/t Au for all Cracow deposits

CategoryTonnage CommodityGradeContained Metal
Proven 172 kt Gold 4.9 g/t 27 koz
Probable 519 kt Gold 3.8 g/t 63 koz
Proven & Probable 690 kt Gold 4.1 g/t 90 koz
Measured 200 kt Gold 9.1 g/t 59 koz
Measured 200 kt Silver 5.7 g/t 37 koz
Indicated 1,400 kt Gold 3.7 g/t 170 koz
Indicated 1,400 kt Silver 3.1 g/t 140 koz
Measured & Indicated 1,600 kt Gold 4.3 g/t 230 koz
Measured & Indicated 1,600 kt Silver 3.4 g/t 180 koz
Inferred 2,300 kt Gold 2.3 g/t 170 koz
Inferred 2,300 kt Silver 1.5 g/t 110 koz
Total Resource 3,900 kt Gold 3.1 g/t 390 koz
Total Resource 3,900 kt Silver 2.3 g/t 290 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required -9 / oz -10 / oz -12 / oz
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required† 762 / oz† 746 / oz† 746 / oz†
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required† 769 / oz† 751 / oz† 746 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,181 / oz† 1,123 / oz† 1,065 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,269 / oz† 1,208 / oz† 1,164 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required19.6   17.5   13.5  
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required34.1   14.2   12.2  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required147.7   146.1   144.5  
EBITDA M AUD  ......  Subscription required  ......  Subscription required70.2   71.6   67.9  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required70.8  
Subscription required - Subscription is required


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
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2021
Subscription required - Subscription is required.

Staff:

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

Corporate Filings & Presentations:

DocumentYear
................................... 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
Subscription required - Subscription is required.

News:

NewsDate
Aeris emerges as buyer of Evolution’s Cracow gold mine June 4, 2020

Aerial view:

Subscription required - Subscription is required.

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