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Australia
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  ...  Subscription required
Fax+61 (8) 9037 6988
WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Cut & Fill
  • Longhole open stoping
  • Transverse stoping
  • Paste backfill
Processing
  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)


Owners

 
CompanyInterestOwnership
St Barbara Ltd. 100 % Direct

Deposit Type

  • Vein / narrow vein


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.

Gold mineralisation at Tower Hill is hosted within a moderately (35 - 50°) east-dipping quartz vein package adjacent to the contact of granite and strongly foliated ultramafic rocks. Quartz-gold vein lodes strike north to north-northwest with strike lengths of up to 600 m and widths from less than a metre to a vein package with a horizontal width of up to 50 m.


Mining Methods

  • Cut & Fill
  • Longhole open stoping
  • Transverse stoping
  • Paste backfill


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.

The Tower Hill reserve is planned to be extracted using two different production mining methods, Transverse Long Hole Stoping and Cut and fill stoping methods.


Crushing and Grinding


Processing

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

Flow Sheet: Subscription required

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.

All Tower Hill ore will be trucked to the Gwalia processing plant.

Recoveries & Grades:

CommodityParameter201920182017
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 10.812.510.7
Subscription required - Subscription is required.

Production:

CommodityUnits2019201820172016
Gold oz  ......  Subscription required  ......  Subscription required265,057276,278
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required924 kt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required1,027 kt
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 12,707 kt Gold 5.8 g/t 2,379 koz
Total Resource 28,783 kt Gold 5.8 g/t 5,400 koz

Commodity Production Costs:

CommodityUnits20192018
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required
Total cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required†  ......  Subscription required†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2019201820172016
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gross profit M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 22, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required Subscription required 2020

Corporate Filings & Presentations:

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

Subscription required - Subscription is required.

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