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Australia
Leonora Operations - Gwalia Mine

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 Location:
3 km S from Leonora, Western Australia, Australia

  Address:
Kane Street, Gwalia
PO Box 67
Leonora
Western Australia, Australia
6438
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WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life12 years (as of Jan 1, 2021)
The cornerstone of Leonora Operations, Gwalia mine, is the deepest underground trucking mine in Australia. Its depth is over 1,600 metres below surface. Leonora Operations includes the Gwalia 1.4mtpa processing plant and underground mine, as well as nearby development opportunities which form part of our Leonora Province Plan.

Prefeasibility study (PFS) work continues to focus on the expansion of the Leonora processing plant capacity from 1.4Mtpa to 2.1Mtpa.


Owners

Source: p. 4,13
CompanyInterestOwnership
St Barbara Ltd. 100 % Direct
Gwalia Mine is 100% owned by St Barbara Limited.

Contractors

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Deposit Type

  • Vein / narrow vein


Summary:

Gold mineralisation occurs as a number of en echelon, moderately east dipping foliation parallel lodes within strongly potassic altered mafic rocks and extends over a strike length of approximately 500 m and to a vertical depth of at least 2,300 m. Four primary lodes (Main Lode, South West Branch, South Gwalia Series and West Lode) have been identified and the geometries summarised below.

Mineralisation domains are defined by abundance of quartz and quartz/carbonate veining, the presence of distinctive laminated veining (quartz/sericite/sulphides +/- au), strong potassic alteration, abundance of sulphides (commonly >3% pyrite) and elevated gold grade (>0.5g/t).

The mineralised zone strikes 15 degrees east of true north over a distance of 500m and plunges 45 degrees to the southeast. The mineralised zone consists of several stepped or en echelon style foliation parallel lodes disposed in plan in a “horse-shoe” shape with the limbs converging at the southern end. The mineralised zone and individual lodes dip east at 35 to 45 degrees and are conformable with the foliation of the Mine Sequence mafic schists. Individual lode widths vary from 2m to 30m true width. Mineralisation has been tested to approximately 2,300m below surface and remains open.


Mining Methods

  • Longhole open stoping
  • Paste backfill


Summary:

St Barbara’s Leonora Operations comprise almost 300 square kilometres of mineral tenure and consists of the Gwalia underground mine and 1.2 Mtpa processing plant, as well as nearby development opportunities as:
- Gwalia open pit mineralisation between 280 and 500 metres below surface(mbs) was identified as a potential source of open pit mill feed upon completion of underground mining.

- The Harbour Lights Deposit is located approximately 5 kilometres from the Leonora Processing Facility. The deposit was initially mined by underground methods between 1904 and 1935 via a series of shafts to around 40 mbs. More recently, ore was extracted from an open pit by Harbour Lights Mining between 1985 and 1992. Since 1995, mining is not undertaken.

- Tower Hill is located approximately 2 km north of the Leonora Processing Facility. Intermittent mining has occurred in the vicinity of Tower Hill since 1898. Early mining was from a small open cut and underground mine to 66 metres depth. The existing Mineral Resources and Ore Reserves for Tower Hill will remain in place while work continues on the best extraction and processing options for this mineralisation.

- The Jasper Region comprises a series of historic open pits and prospects approximately 25 km north of Gwalia. These include the Jasper Flat, Jasper Hill, Falklands Trend, Hawaii, Greenland and Trevor Bore deposits.

St Barbara’s flagship mine Gwalia is located 3 kilometres south of ........


Crushing and Grinding
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Processing

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Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required268265276
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required625 kt679 kt790 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required652 kt711 kt828 kt
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1.4 Mt
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Reserves at December 31, 2021:
Ore Reserves Cut-off Grades: Gwalia (4.0 g/t Au).
Mineral Resources Cut-off Grades: Gwalia (2.5 g/t Au), Gwalia Open Pit (0.4 g/t Au), Harbour Lights (0.4 g/t Au Oxide / 0.8 g/t Au Sulphide), Tower Hill (0.4 g/t Au).

CategoryTonnage CommodityGradeContained Metal
Proven 1,543 kt Gold 7.3 g/t 361 koz
Probable 11,318 kt Gold 4.8 g/t 1,761 koz
Proven & Probable 12,862 kt Gold 5.1 g/t 2,121 koz
Measured 5,997 kt Gold 4.5 g/t 868 koz
Indicated 58,114 kt Gold 3.1 g/t 5,838 koz
Inferred 3,100 kt Gold 5.7 g/t 573 koz
Total Resource 67,211 kt Gold 3.4 g/t 7,279 koz

Commodity Production Costs:

CommodityUnits20222021202020192018
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -2 / oz  
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 572 / oz  
Total cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 613 / oz†  
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 802 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units2022
UG mining costs ($/t mined) AUD 199.6
Processing costs ($/t milled) AUD  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M AUD  ......  Subscription required
Growth Capital M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 33.8   30.2  
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 70.6   -47.5  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 461.3   441.9  
Gross profit M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 303.3   298.8  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 285.2   281.5  
Subscription required - Subscription is required



Heavy Mobile Equipment as of August 9, 2018:
HME TypeModelSizeQuantity
Drill (long hole) ....................... Subscription required
Jumbo ....................... Subscription required
Loader ....................... Subscription required
Truck (underground) ....................... Subscription required 65 t ....................... Subscription required
Truck (underground) ....................... Subscription required 60 t ....................... Subscription required
Truck (underground) ....................... Subscription required 65 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required Subscription required 2022
Subscription required Subscription required 2021
Subscription required Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Corporate Presentation 2022
Quarterly Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Quarterly Report 2018
Annual Report 2017
Year-end Mineral Reserves 2016
Project Description 2013
Subscription required - Subscription is required.

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