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Australia
Thunderbox Operation (Bannockburn Mine, Kailis Mine, Thunderbox OP Mine, Thunderbox UG Mine, Waterloo 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

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
Thunderbox Operation (TBO) includes the Thunderbox, the Kailis (care and maintenance), the Bannockburn (care and maintenance) and the Waterloo (exploration) Projects.During FY21, the Thunderbox Operations were added to the Northern Star Yandal Operations portfolio as a result of the merger with Saracen.

Throughout FY22 key infrastructure developments were installed at Thunderbox to increase capacity of the Thunderbox mill operations from 3Mtpa to 6Mtpa, due to be completed in Q2 FY23.

Owners

Source: p. 84
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

  • 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).

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 assemblage. Syn-mineralisation veins have a continuum of vein textures ranging from laminated to pseu ........

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). 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. 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. The mining method to be employed at the Otto Bore deposit is conventional open pit with hydraulic excavator and dump truck fleet, and drill and blast activity. The Kailis deposit has successfully been mined by open pit in the past and in Stage 1 and Stage 2. The mining method employed at Kailis open pit ........

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 required145,152116,83731,465
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,353 kt3,410,000 t2,611,000 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required2,826 kt2,656,000 t2,305,000 t
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required2.5 Mt2.5 Mt2.5 Mt
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required9,281,631 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required5,928,631 t
Subscription required - Subscription is required.

Reserves at March 31, 2022:
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$1,750/oz.

The Mineral Resources estimated at a grade of 0.5g/t for Open Pits and 1.2g/t for underground operations.

CategoryTonnage CommodityGradeContained Metal
Proven 10,495 kt Gold 1.5 g/t 522 koz
Probable 31,476 kt Gold 1.6 g/t 1,625 koz
Proven & Probable 41,971 kt Gold 1.6 g/t 2,147 koz
Measured 17,821 kt Gold 1.6 g/t 914 koz
Indicated 57,614 kt Gold 1.6 g/t 2,995 koz
Inferred 8,878 kt Gold 1.6 g/t 459 koz
Total Resource 84,313 kt Gold 1.6 g/t 4,368 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Credits (by-product) Gold AUD  ......  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†
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required 1,071 / oz   1,253 / oz   1,293 / 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.
Subscription required - Subscription is required.

Financials:

Units20222021202020192018
Growth Capital M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 30.7  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 234.8  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 74.4  
EBITDA M AUD  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 65  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 7, 2022
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Subscription required - Subscription is required.

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
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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