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Australia
Thunderbox & Bronzewing Operation (Bronzewing Mine, Thunderbox OP Mine, Thunderbox UG Mine)

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 Location:
84 NW from Leonora, Western Australia, Australia
  Address:
Level 1, 388 Hay Street PO Box 2008
Subiaco
Western Australia, Australia
6008
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Fax+61-8-6188-2111
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Sub-level open stoping (SLOS)
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life2027
The Thunderbox & Bronzewing operations are part of Yandal Production Centre. Thunderbox Operation (TBO) includes the Thunderbox, the Kailis (care and maintenance), the Bannockburn (care and maintenance) and the Waterloo (exploration) Projects. In 2023, Bronzewing operations have been included in the Thunderbox operating segment.

During 2023, commencement of mining at Orelia (Bronzewing) and Otto Bore (Thunderbox). The Thunderbox mill expansion project advanced towards delivering its 6Mtpa nameplate capacity.

The Wonder underground project, which will provide highgrade feed sources for the expanded Thunderbox mill, is scheduled to commence in January 2024.

Owners

Source: p. 453
CompanyInterestOwnership
Northern Star Resources Ltd. 100 % Indirect
The tenements (Thunderbox Operations) are all held by Northern Star (Thunderbox) Pty Ltd, Northern Star (SR Mining) Pty Ltd and Northern Star (Talisman) Pty Ltd which are all wholly owned subsidiaries of Northern Star Resources Ltd.

Contractors

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Deposit Type

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

Summary:

Thunderbox Operation (TBO) includes the Thunderbox Project (comprised of the Thunderbox, Rainbow and Otto Bore gold deposits), the Kailis Project (comprised of the Kailis Stage 1 & 2 gold deposits), the Bannockburn Project (comprised of the Bannockburn and North Well gold deposits) and the Waterloo Project (comprised of the Waterloo and Amorac nickel deposits). In 2023, Bronzewing operations (Orelia Pit) have been included in the Thunderbox operating segment.

Thunderbox
Thunderbox is a mesothermal lode gold deposit located at the southern end of the Yandal greenstone belt in an area where several major shear zones converge and join with the Perseverance Fault.

The shear zone dips at 30° to 60° WSW, with the exception in the vicinity of the mineralisation, where the shear is vertical to steeply dipping. Mineralisation is hosted by strongly deformed, silicified and carbonate altered albite-quartz porphyry in the hangingwall of the shear zone. The shear juxtaposes foliated basalts and intrusive porphyries in the hangingwall against sedimentary rocks in the footwall. The zone of shearing is over 200m wide. An ultramafic unit occurs within the shear, in the footwall of the deposit and is attenuated along the shear.

The main gold related hydrothermal alteration assemblage comprises quartz-ankerite-arsenopyrite-pyrrhotite-galena and gold. This assemblage has been overprinted by a retrograde chlorite-epidote-white mica-biotite-quartz and pyrite a ........

Mining Methods

  • Truck & Shovel / Loader
  • Sub-level open stoping (SLOS)
  • Longhole open stoping
  • Paste backfill

Summary:

Thunderbox Operation (TBO) includes the Thunderbox Project (comprised of the Thunderbox, Rainbow and Otto Bore gold deposits), the Kailis Project (comprised of the Kailis Stage 1 & 2 gold deposits), the Bannockburn Project (comprised of the Bannockburn and North Well gold deposits) and the Waterloo Project (comprised of the Waterloo and Amorac nickel deposits). In the 2023, Bronzewing operations (Orelia Pit) have been included in the Thunderbox operating segment.

Thunderbox
The Thunderbox deposit is amenable to mining by both open pit and underground methods. Mining method employed at Thunderbox mine is conventional open pit with hydraulic excavator and dump truck fleet, and drill and blast activity. The TBO UG Ore Reserve is based on sub-level open stoping (SLOS) with paste fill, and long hole open stoping (LHOS) mining methods. SLOS is the dominant mining method, and accounts for 87% of the Ore Reserve estimate by tonnes. The SLOS zone, ranges in width from 3m to 50m, and dips at 70-80 degrees.

Rainbow
The Rainbow deposit is amenable to mining by open pit methods. There has not been any previous mining at Rainbow. There are reasonable grounds to assume that in the future this deposit will be mined by conventional open pit methods given the close proximity to surface of the mineralisation.

Otto Bore
During 2023, commencement of mining at Otto Bore.

The mining method to be employed at the Otto Bore deposit is convent ........

Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required145,152116,837
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics202320222021202020192018
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required2.5 Mt2.5 Mt2.5 Mt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,984 kt3,353 kt3,410,000 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required2,891 kt2,826 kt2,656,000 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required8,988,037 t5,928,631 t
Subscription required - Subscription is required.

Reserves at March 31, 2023:
Thunderbox Underground:
The Ore Reserve estimated at a variable cut-off grade of 1.01g/t was calculated based upon an assumed gold price of AUD$1750/oz.
Thunderbox Open Pit:
The Ore Reserve estimated at cut-off grade of 0.50g/t, estimated using assumed gold price of AUD$1,850/oz.

The Mineral Resources estimated at a grade of 0.5g/t for Open Pits and 0.8g/t for underground operations.

CategoryTonnage CommodityGradeContained Metal
Proven 12,204 kt Gold 1.5 g/t 596 koz
Probable 29,019 kt Gold 1.8 g/t 1,724 koz
Proven & Probable 41,223 kt Gold 1.8 g/t 2,320 koz
Measured 20,030 kt Gold 1.5 g/t 996 koz
Indicated 49,773 kt Gold 1.8 g/t 2,886 koz
Inferred 9,864 kt Gold 1.6 g/t 518 koz
Total Resource 79,668 kt Gold 1.7 g/t 4,400 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required 851 / oz   839 / oz  
Total cash costs (sold) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required 1,071 / oz   1,253 / oz  
All-in sustaining costs (sold) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in costs Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
† Net of By-Product.
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Financials:

Units202320222021202020192018
Growth Capital M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 30.7  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 234.8  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 74.4  
EBITDA M AUD  ......  Subscription required  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 65  
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Water Supply
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Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2023
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Staff:

Total WorkforceYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2023
Press Release 2023
Quarterly Report 2023
Sustainability Report 2023
Year-end Mineral Reserves 2023
Annual Report 2022
Corporate Presentation 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
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Annual Report 2018
Quarterly Report 2018
Annual Report 2017
Corporate Presentation 2017
Quarterly Report 2017
Year-end Mineral Reserves 2017
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