Overview
Stage | Production |
Mine Type | Open Pit & Underground |
Commodities |
|
Mining Method |
- Transverse open stoping
- Longitudinal stoping
- Open stoping
- Truck & Shovel / Loader
- Avoca
- Longhole open stoping
- Cemented paste backfill
- Unconsolidated rockfill
|
Production Start | ... |
Mine Life | 2027 |
Carosue Dam Operations includes the Carosue Dam Project, the Porphyry Project and the Deep South Project.
Growth projects planned for FY24: Pre-production of Porphyry underground and Wallbrook open pit as feed sources for Carosue Dam Operations. |
Source:
p. 172-266
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
- 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).
Karari-Dervish
The Karari-Dervish deposits are lithologically and structurally controlled and have been offset along a series of major faults running NE-SW and NW-SE, as well as intruded by large lamprophyre units post mineralization. 60 degrees. Mineralisation is dominated by pyrite and hosted in broad hematite altered sandstone units with a central high grade siliceous core light-moderately dipping to the North.
Dimensions
Mineralisation at Karari-Dervish has continuity over 1000m along strike, 1100m down dip and 250m across strike. High grade mineralisation is controlled by 60° East dipping shear zones. Mineralisation is hosted within extensive quartz vein breccia zones adjacent to the shears. The high-grade mineralisation is associated with intense haematite, silica and sericite alteration that occurs predominantly where flatter cross-linking structures intersect with the steeper dipping shears.
Porphyry
Mineralisation, especially high gold values is associated with intense shearing and confined to thin, intensely sheared bands approximately 10cm thick. The edge of the mineral ........
Mining Methods
- Transverse open stoping
- Longitudinal stoping
- Open stoping
- Truck & Shovel / Loader
- Avoca
- Longhole open stoping
- Cemented paste backfill
- Unconsolidated rockfill
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.
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 design. Standard underground infrastructure is currently operational; this includes a decline for access and truck ........
Source:
- subscription is required.
Flow Sheet:
Summary:
- subscription is required.
Source:
- subscription is required.
Production:
Commodity | Units | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
Gold
|
oz
| ...... | ...... | ...... | ...... | ...... | 171,301 | 155,970 |
All production numbers are expressed as metal in doré.
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Operational Metrics:
Metrics | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 |
Annual milling capacity
| ...... | ...... | ...... | ...... | 2.4 Mt | 2.4 Mt |
Waste
| ...... | ...... | ...... | ...... | 877,724 t | |
Ore tonnes mined
| ...... | ...... | ...... | ...... | 1,976 kt | 1,718,000 t |
Tonnes milled
| ...... | ...... | ...... | ...... | 2,437 kt | 2,479,000 t |
Total tonnes mined
| ...... | ...... | ...... | ...... | 2,853,724 t | |
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Reserves at March 31, 2023:
Karari-Dervish: For the purpose of Open Pit Ore Reserve Estimation a cut-off of 0.50gpt. For the purpose of Underground Ore Reserve Estimate’s a variable cut-off grade of 1.75g/t (Karari) and variable cut-off grade of 1.52g/t (Dervish). 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 1.57g/t. Wallbrook: the Ore Reserve is estimated at cut-off grade of 0.8gpt. Mineral Resource Estimation were set at 0.6gpt. Million Dollar: Mineral Resources a cut-off grade of 0.5gpt has been implemented. The Ore Reserve a cut-off grade of 0.50gpt. Deep South: Mineral Resources a cut-off a grade of 1.0g/t. For Ore Reserve Estimate a variable cut-off grade of 1.03g/t. Safari Bore: the Ore Reserve is estimated at cut-off grade of 0.9gpt. Box Well (Moody’s Reward): Mineral Resources cut-off grade at a grade of 0.5gpt. The Ore Reserve is at cut-off grade of 0.6g/t.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
12,639 kt
|
Gold
|
1.8 g/t
|
729 koz
|
Probable
|
12,239 kt
|
Gold
|
1.9 g/t
|
749 koz
|
Proven & Probable
|
24,879 kt
|
Gold
|
1.8 g/t
|
1,478 koz
|
Measured
|
16,050 kt
|
Gold
|
1.9 g/t
|
970 koz
|
Indicated
|
30,338 kt
|
Gold
|
2.1 g/t
|
2,084 koz
|
Inferred
|
16,872 kt
|
Gold
|
2.2 g/t
|
1,048 koz
|
Total Resource
|
63,259 kt
|
Gold
|
2.1 g/t
|
4,102 koz
|
HME Type | Model | Quantity | Leased or Contractor | Ref. Date | Source |
Drill
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.......................
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Oct 31, 2023
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p.1
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Drill
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.......................
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Oct 31, 2023
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p.1
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Drill
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.......................
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Oct 31, 2023
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p.1
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Drill (long hole)
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.......................
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.......................
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Oct 31, 2023
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p.1
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Excavator
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.......................
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.......................
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Apr 21, 2021
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p.7
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Explosives Charger
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.......................
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.......................
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Oct 31, 2023
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p.1
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Grader
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.......................
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.......................
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Oct 31, 2023
|
p.1
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Jumbo
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.......................
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.......................
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Oct 31, 2023
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p.1
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Loader
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.......................
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.......................
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Oct 31, 2023
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p.1
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Loader - Tool Carrier
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.......................
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.......................
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Oct 31, 2023
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p.1
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Load-Haul-Dump (LHD)
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.......................
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.......................
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Oct 31, 2023
|
p.1
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Truck (service)
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.......................
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.......................
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Oct 31, 2023
|
p.1
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Truck (underground)
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.......................
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.......................
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Oct 31, 2023
|
p.1
|
Truck (underground)
|
.......................
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.......................
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Oct 31, 2023
|
p.1
|
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