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Australia
Gwalia Mine (Leonora Operation)

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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
Phone+61-(8)-9037-2000
Fax+61-(8)-9037-6988
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
  • Paste backfill
Processing
  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
On-Site Camp yes
Mine Life2031
St Barbara approved the project to extend the historic Gwalia gold mine to at least 2000 metres below surface in March 2017. The $100 million project, which remained on track after the December 2018 quarter, is expected to take up to three years to complete. It consists of two main components, a ventilation upgrade and paste aggregate fill. St Barbara has forecast Gwalia to produce 290,000 ounces of gold a year by the 2022 financial year.
Latest NewsSt Barbara cuts gold production outlook at Gwalia     March 22, 2019


Owners

 
CompanyInterestOwnership
St Barbara Ltd. 100 % Direct

Deposit Type

  • Vein / narrow vein

Source: Source p.19

Summary:

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 2,080m below surface and remains open.


Mining Methods

  • Longhole open stoping
  • Paste backfill

Source: p.2

Summary:

The primary mining method since resumption of underground production in 2008 is a Longhole Open Stoping method with paste fill. Stoping configurations are predominantly double lift (40m vertical interval) however single lift stoping (20m vertical interval) is used in some areas. The Double Lift stoping method involves concurrently mining the uphole and downhole sections of the stope. The upper and lower portions of the stope are drawn back and bogged at the same time.


Crushing and Grinding
Source: Source p.4


Processing

  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Source

Summary:

All Gwalia ore is trucked to the Gwalia processing plant. The processing plant is located at St Barbara’s Leonora Operations and consists of a three stage crushing circuit, single stage milling circuit and hybrid CIL circuit with one designated leach tank and 7 adsorption tanks. Gold is recovered from activated carbon into concentrated solution via a split AARL type elution circuit. Electrowinning and smelting are conducted in an adjacent secure gold room. The tailings from the process are thickened and pumped to a paddock type tailings storage facility with multi-spigot distribution (Zimmerman 2013). Gold doré bars are transported by armoured trucks to the Perth Mint for refining.

Recoveries & Grades:

CommodityParameter2019201820172016
Gold Recovery Rate, % 98989796
Gold Head Grade, g/t 10.81210.79.3

Production:

CommodityUnits20202019201820172016
Gold oz 182 ^220,169268,428265,057267,166
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational Metrics:

Metrics2019201820172016
Ore tonnes mined 625 kt679 kt790 kt924 kt
Tonnes milled 652 kt711 kt828 kt951 kt

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 2,220 kt Gold 8 g/t 568 koz
Probable 7,915 kt Gold 5.9 g/t 1,506 koz
Proven & Probable 10,135 kt Gold 6.4 g/t 2,073 koz
Measured 5,034 kt Gold 7.3 g/t 1,183 koz
Indicated 17,527 kt Gold 6 g/t 3,393 koz
Inferred 1,129 kt Gold 5.5 g/t 199 koz
Total Resource 23,690 kt Gold 6.3 g/t 4,775 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Credits (by-product) Gold AUD -2 / oz -2 / oz
Cash costs Gold AUD 703 / oz 572 / oz
Total cash costs Gold AUD 746 / oz† 613 / oz† 592 / oz† 609 / oz†
All-in sustaining costs (AISC) Gold AUD 1,260 / oz ^† 1,027 / oz† 802 / oz† 785 / oz† 783 / oz†
^ Guidance / Forecast.
† Net of By-Product.

Financials:

Units20202019201820172016
Capital expenditures (planned) M AUD 92.5  
Revenue M AUD 392.68  461.26  441.95  440.33  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
Environmental Superintendent Dan Pintea LinkedIn Jan 16, 2020
Technical Services Manager Andrew Shepherd LinkedIn Jan 16, 2020


Corporate Filings & Presentations:

DocumentYear
Annual Report 2019
Quarterly Report 2019
Year-end Mineral Reserves 2019
Annual Report 2018
Corporate Presentation 2018
Quarterly Report 2018
Annual Report 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Project Description 2013

News:

NewsDate
St Barbara cuts gold production outlook at Gwalia March 22, 2019

Aerial view:

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