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Australia
Thunderbox UG Mine (Thunderbox Operation)

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 Location:
82 km NW from Leonora, Western Australia, Australia

  Address:
Level 1, 388 Hay Street PO Box 2008
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
Fax+61-8-6188-2111
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level open stoping (SLOS)
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life2027


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 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. At the known extremities of the mineralisation, interpreted as a pepperitic apron, the porphyry host is less continuous and interchanges with mafic volcaniclastics.

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. Synmineralisation veins have a continuum of vein textures ranging from laminated to pseudo-breccias.

Throughout the Thunderbox Deposit, elevated grades occur within southerly plunging ore shoots that are more evident in the lateral extents of the orebody. Whilst the shoots persist centrally, the gold ........


Mining Methods

  • Sub-level open stoping (SLOS)
  • Longhole open stoping
  • Paste backfill


Summary:

Sub-level open stoping (SLOS) with paste fill, and LHOS have been selected as the preferred mining methods.

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.

Average mining dilution is 11%. 15% dilution has been applied to up hole stopes to account for paste dilution, and 6% dilution assumed for the down hole stopes. All dilution was assumed to be at zero grade.

The average mining recovery is 94%.

Minimum mining widths of 3m, this is based on the current stope performance to date, and mining method considerations.

Inferred material is excluded from the ore reserves. The Life of Mine Plan (LOMP) design includes Inferred Resources representing 6% of the mining inventory, contained within the stopes and development in the periphery of the indicated resource. This amount contributes to a minor amount of metal (<6% of ounces). Ongoing grade control drilling is also part of the LOMP.

The selected mining method requires the development of an access decline, ventilation raises, and associated electrical, paste fill plant and dewatering infrastructure. Paste fill plant is currently operational.

Underground mechanised mining for development, ground support, and ........


Crushing and Grinding
Flow Sheet: Source

The process consists of a double toggle jaw crusher followed by a SAG and Ball milling circuit.

Metso Outotec has been chosen to supply its Premier SAG Mill for Northern Star Resources’ Thunderbox gold mine expansion. The expansion should double the throughput of the Thunderbox operation.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2022202120202019
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required126,171 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required199,081 t
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Reserves at March 31, 2022:
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.

The Mineral Resources estimated at a grade of 1.2g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 8,570 kt Gold 1.7 g/t 475 koz
Probable 7,132 kt Gold 1.9 g/t 439 koz
Proven & Probable 15,702 kt Gold 1.8 g/t 914 koz
Measured 12,986 kt Gold 1.8 g/t 733 koz
Indicated 13,811 kt Gold 1.8 g/t 805 koz
Inferred 4,342 kt Gold 1.8 g/t 254 koz
Total Resource 31,139 kt Gold 1.8 g/t 1,792 koz



Heavy Mobile Equipment as of December 17, 2022:
HME TypeModelQuantityLeased or
Contractor
Drill ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Explosives Charger ....................... Subscription required ....................... Subscription required Leased
Explosives Charger ....................... Subscription required ....................... Subscription required Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Leased
Raise boring rig ....................... Subscription required ....................... Subscription required Leased
Truck (underground) ....................... Subscription required ....................... Subscription required Leased
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Mine Management:

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


Corporate Filings & Presentations:

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