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Australia
Wiluna Mining (Matilda-Wiluna) Operation

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 Location:
3 km SE from Wiluna, Western Australia, Australia
  Regional Office:
Level 3 1 Altona Street
PO Box 1412
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
Fax+61-8-9322-6429
WebsiteWeb
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
Production Start...
Mine Life15 years (as of Jan 1, 2021)
Wiluna Mining Operation has long history of gold production and produced over 4.4 million ounces since 1897. In mid-2016 the Wiluna Mining Corporation (previously Blackham Resources Limited) re-started mining at the Wiluna Gold Operation.

Planned cessation of mining operations mid December 2022 with processing expected to continue until mid January 2023 with the mine moving to care and maintenance basis once processing is completed.

Care and maintenance will involve maintaining dewatering systems and access to the underground to facilitate restart of operations as required in the future.

The company is exploring toll treatment opportunities and low capital solutions for the reprocessing of Wiltails to commence immediately following completion of the processing ore from current mining activities.

Process established seeking proposals for a sale of the Company’s assets and/or a recapitalisation.

Owners

Source: p. 2
CompanyInterestOwnership
Wiluna Mining Corporation Ltd. (operator) 100 % Indirect
Wiluna Mining Corporation Limited (formerly Blackham Resources Limited) is a Western Australian based gold mining company that owns and operates the Wiluna Mining Operation.

On 20 July 2022, Michael Ryan, Kathryn Warwick, Daniel Woodhouse and Ian Francis, all Senior Managing Directors of FTI Consulting, were appointed as Voluntary Administrators of Wiluna Mining Corporation Limited.

18 August 2022 - The Voluntary Administrators of Wiluna Mining Corporation Limited (Administrators Appointed) and its subsidiaries (Together, “Wiluna” or “Wiluna Mining Group”) have obtained a court order to postpone the second creditors meeting by a period of approximately four months from 24 August 2022 to 16 December 2022. The Administrators have previously advised they would explore opportunities for a recapitalisation or sale of Wiluna.

Contractors

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Deposit Type

  • Orogenic
  • Vein / narrow vein

Summary:

Wiluna Mining Operation comprises four mining centers being Wiluna, Matilda, Lake Way and Regent.

WILUNA MINING CENTRE
The Wiluna gold deposits are categorised as orogenic gold deposits, with similarities to many other gold deposits in the Yilgarn region. The deposits are hosted within the Wiluna Domain of the Wiluna Greenstone Belt. Rocks in the Wiluna Domain have experienced greenschist-facies regional metamorphism and brittle and ductile deformation. The Wiluna Domain is comprised of a sequence of basalts and high-magnesian basalts, with intercalated felsic intrusions, lamprophyre dykes, metasediments, and dolerites.

Mineralisation is structurally controlled by the Wiluna strike-slip fault system. Gold occurrences are predominantly associated with north or northeast trending dextral strike-slip faults. Gold mineralisation is localised at dilational bends or jogs along the faults, at fault intersections, horsetail splays and in later stage cross-cutting structures.

Post mineralisation reactivation on the main structures has offset ore bodies by a few hundred metres. Lodes are generally associated with silica-sericite-carbonate-sulphide alteration and comprise quartz lodes, cataclastic breccias and narrow veins associated with splay structures.

Depending upon the nature of the host rock and structural control, the ore zones generally form steeply dipping and southerly plunging lenses from 2 m to 25 m in thickness and exten ........

Mining Methods

  • Longhole open stoping

Summary:

In December 2021 quarter the first sulphide stopes in both Happy Jack North and Bulletin mines commenced extraction with good recovery.

Stage 1 operations were in production as at the end of the June 2022 quarter with gold in concentrate successfully being produced onsite and shipped to China. Key activities for the June 2022 quarter included:
• Underground mine development and ramp up of stoping operations in the Happy Jack and Bulletin mining areas;
• Construction of the Wiltails tailings retreatment operation (not yet completed);
• Stage 2 and 3 Expansion Studies put on hold during the quarter due to escalating costs and industry wide labour shortages.

Subsequent to the end of the June 2022 quarter, WMC has continued with its production post the appointment of the voluntary administrators. Mining has been principally within already developed areas. There has been a reduction in development equipment from 10 August 2022.

The production method employed is long hole open stoping with in-situ pillars for local support, until the cemented paste fill plant is constructed, and paste distributed to the underground workings.

SULPHIDE DEVELOPMENT PLAN
The Wiluna Mining Centre is divided into three geographical areas, centred on underground mine portals and planned mining areas of the Stage 1 Sulphide Development plan. Mining is planned to commence at the Wiluna North Mine area via the existing Bulletin Decline, and ........

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

Production:

CommodityProductUnits202220212020201920182017
Gold Metal in conc./ doré oz  ......  Subscription required
Gold Metal in doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required70,56539,413
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,938,606 t1,696,842 t1,323,616 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required9.1 8.6 13.7
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1,807,931 t1,835,057 t965,300 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1.8 Mt1.8 Mt
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Reserves at March 31, 2022:
Mineral Resource at each Mining Centre in reported at cut-offs related to material type inside A$2,750 optimised pit shells (> 0.35 g/t for oxide and transitional material, and >0.70 g/t for fresh rock), and >2.3 g/t below the pit shells.

CategoryTonnage CommodityGradeContained Metal
Proven 0.58 Mt Gold 1.27 g/t 23.6 koz
Probable 36.19 Mt Gold 1.2 g/t 1,401 koz
Proven & Probable 36.76 Mt Gold 1.2 g/t 1,424 koz
Measured 1.43 Mt Gold 1.24 g/t 57 koz
Indicated 57.1 Mt Gold 1.91 g/t 3,495 koz
Inferred 19.9 Mt Gold 3.09 g/t 1,978 koz
Total Resource 78.4 Mt Gold 2.19 g/t 5,531 koz

Commodity Production Costs:

CommodityUnits20212020201920182017
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,629 / oz†   1,875 / oz†  
† Net of By-Product.
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Financials:

Units202220212020201920182017
Capital expenditures M AUD  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 118.3   47.3  
Gross profit M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 4.8   7.5  
After-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required -20   -6.8  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 6.2   24.7  
Subscription required - Subscription is required

Heavy Mobile Equipment as of November 4, 2021:
HME TypeModelQuantityLeased or
Contractor
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required Leased
Explosives Charger ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Truck (underground) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 4, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required 2022
Subscription required 2021
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Half-year Report 2022
Press Release 2022
Quarterly Report 2022
Quarterly Report 2022
Year-end Mineral Reserves 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 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Other 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Fact Sheet 2017
Feasibility Study Report 2017
Annual Report 2016
Annual Report 2015
Pre-Feasibility Study Report 2015
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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