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Australia
Carosue Dam Operation

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 Location:
106 km NE from Kalgoorlie-Boulder, Western Australia, Australia
  Address:
Level 1, 388 Hay Street
PO Box 2008
Subiaco
Western Australia, Austria
6008
Phone  ...  Subscription required
Fax+61-8-6188-2111
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  • Overview
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Avoca
  • Longitudinal stoping
  • Paste backfill
Production Start...
Mine Life2027
Carosue Dam Operations includes the Carosue Dam Project (comprised of the Karari and Dervish gold deposits), the Porphyry Project (comprised of the Porphyry, Million Dollar, Enterprise, and Wallbrook gold deposits), and the Deep South Project (comprised of the Deep South, Safari Bore and Box Well gold deposits).

The FY22 results demonstrate that the Carosue Dam FY21 mill expansion has been a sound investment and continues to operate well above the design nameplate of 3.2Mtpa. Development of Carosue Dam Porphyry underground, scheduled to commence in H1 FY23.

Owners

Source: p. 310-425
CompanyInterestOwnership
Northern Star Resources Ltd. 100 % Indirect
The Scheme of Arrangement in relation to the merger of Northern Star and Saracen Mineral Holdings Limited (Saracen) was implemented on 12 February 2021, As a result, Saracen became wholly owned subsidiarie of Northern Star on 12 February 2021.

Karari: mining Leases M28/166 and M28/167 are held 100% by Northern Star Resources Limited.
Dervish: the tenements are held 100% by Northern Star (Carosue Dam) Pty Ltd, a wholly owned subsidiary of Northern Star Resources Limited.
Porphyry, Million Dollar,Enterprise, Wallbrook: the tenements are held 100% by Northern Star Resources Limited.
Deep South, Safari Bore, Box Well (Moody’s Reward): the tenement is held 100% by Northern Star Resources Limited.

Contractors

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Deposit Type

  • Hydrothermal
  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Porphyry

Summary:

The Carosue Dam Operations (CDO) assets include the Carosue Dam Project (comprising the Karari and Whirling Dervish gold deposits), the Porphyry Project (consisting of the Porphyry, Million Dollar, Enterprise and Wallbrook gold deposits) and the Deep South Project (consisting of the Deep South, Safari Bore and Box Well (Moody’s Reward) gold deposits).

Gold mineralisation at Karari is hosted within extensive quartz vein breccia zones in an altered volcaniclastic metasandstone and tuff sequence. This sequence is offset by an anastomosing system of NE-SW and NW-SE trending shear zones and intruded by monzonite bodies post- mineralisation (ca. 2.6 Ga). The host sedimentary sequence dips moderately to the north. Gold mineralisation is strongly associated with sodic alteration (quartz+albite+carbonate) of the host rock that was subsequently overprinted by hematite alteration. High grade mineralisation is controlled by 60° east dipping shear zones. Mineralisation has continuity over 1,000 m along strike, 1,100 m down dip and 250 m across strike.

Mineralisation occurs at the intersection of Eliot Lode Shear and Monty North Shear. Occurs as quartz stockwork veining along contact between fine grained porphyry and underlying volcanic sandstone sequence, with strong and pervasive hematite alteration halo. Gold occurs mainly as blebs, intergrown within pyrite or as disseminations in the host units. Lodes comprise NW trending lensoidal to anastomosing mineralised zon ........

Mining Methods

  • Truck & Shovel / Loader
  • Open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Avoca
  • Longitudinal stoping
  • Paste backfill

Summary:

The Karari-Dervish mine and Deep South mine are the active underground mines. Karari underground mine has been operating for 5 years and has continually ramped up production and currently produces approximately 1.2Mtpa. Underground mechanised mining for development, ground support, and open stoping is utilised at Karari. Mining and geotechnical studies have determined open stoping (both transverse and longitudinal) with paste fill is appropriate for the deposit. Some stoping locations will utilise remnant rib and sill pillars for either geotechnical reasons and/or availability of paste fill. This mining method of open stoping and backfilling with paste fill is widely used throughout the Western Australian Goldfields and Australia. Dervish underground mines the orebody via a longhole open stoping method from top down with the ore production ramped up to approximately 850kt per annum, and along with Karari forms ‘Carousue Dam Underground’ which provides the majority of the mill feed. The current Dervish mine design allows for: some areas of the resource to remain in-situ, as either rib or sill pillars, plus some resource areas to achieve higher extraction rates via the backfilling of adjacent stopes with paste fill. The current Karari mine design allows for paste fill to be used throughout the mine design and therefore the overall extraction ratio of this portion of the mineral resources is approximately 96%. Some mining of remnant pillars has been included in the mine des ........

Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required171,301155,970157,191
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,976 kt1,718,000 t1,566,000 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required2,437 kt2,479,000 t2,469,000 t
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required2.4 Mt2.4 Mt2.4 Mt
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required2,853,724 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required877,724 t
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Reserves at March 31, 2022:
Karari-Dervish:For the purpose of Ore Reserve Estimation a marginal cut-off of 0.50gpt.
Porphyry: Mineral Resources a cut-off grade of 0.5gpt has been implemented. The Open Pit Ore Reserve a cut-off grade of 0.50gpt, Underground Ore Reserve Estimate a planning cut-off grade of 1.63g/t.
Wallbrook: the Ore Reserve is estimated at cut-off grade of 0.50gpt. Mineral Resource Estimation were set at 0.5gpt
Million Dollar: Mineral Resources a cut-off grade of 0.5gpt has been implemented. The Ore Reserve a cut-off grade of 0.60gpt.
Deep South: Mineral Resources was reported within an optimised pit shell at $2250 at a 0.5g/t cut off for the open pit resources, and for the underground resource within MSO underground shells generated at 1.2 g/t cut-off. For Ore Reserve Estimate a variable cut-off grade of 1.67g/t.
Safari Bore: the Ore Reserve is estimated at cut-off grade of 0.50gpt.
Box Well (Moody’s Reward): Mineral Resources cut-off grade at a grade of 0.5gpt.

CategoryTonnage CommodityGradeContained Metal
Proven 7,133 kt Gold 2.1 g/t 481 koz
Probable 22,120 kt Gold 1.8 g/t 1,295 koz
Proven & Probable 29,252 kt Gold 1.9 g/t 1,776 koz
Measured 13,903 kt Gold 2.2 g/t 980 koz
Indicated 35,371 kt Gold 2 g/t 2,253 koz
Inferred 16,444 kt Gold 2.1 g/t 995 koz
Total Resource 65,718 kt Gold 2.1 g/t 4,227 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required 935 / oz   1,037 / oz  
Total cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required 1,199 / oz   1,413 / oz  
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†
† Net of By-Product.
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Operating Costs:

Units20202019
Processing costs ($/t milled) AUD 22.921
G&A ($/t milled) AUD  ......  Subscription required  ......  Subscription required
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Financials:

Units20222021202020192018
Growth Capital M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 24.1  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 276.2  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 51.7  
EBITDA M AUD  ......  Subscription required  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 84.6  
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Heavy Mobile Equipment:
HME TypeModelQuantityLeased or
Contractor		Ref. Date
Drill ....................... Subscription required ....................... Subscription required Leased Dec 15, 2022
Drill ....................... Subscription required ....................... Subscription required Leased Dec 15, 2022
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased Dec 15, 2022
Excavator ....................... Subscription required ....................... Subscription required Leased Apr 21, 2021
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Leased Dec 15, 2022
Truck (service) ....................... Subscription required ....................... Subscription required Leased Dec 15, 2022
Truck (underground) ....................... Subscription required ....................... Subscription required Leased Dec 15, 2022
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Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Dec 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 31, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 31, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 31, 2022
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Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
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................................... Subscription required 2020
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................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Quarterly Report 2018
Annual Report 2017
Quarterly Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
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