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Australia
Deflector Mine (Deflector Operation)

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 Location:
170 Km E from Geraldton, Western Australia, Australia

  Address:
Suite 4, Level 3 South Shore Centre 85 South Perth Esplanade PO Box 876; South Perth WA 6951
South Perth
Western Australia, Australia
6151
Phone  ...  Subscription required
Fax+61-8-6313-3888
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
  • Copper
Mining Method
  • Longhole open stoping
  • Cemented backfill
Production Start...
Mine Life5 years (as of Jan 1, 2020)
The Deflector Region Operation is in the midwest region of Western Australia and comprised the Deflector and Rothsay underground mines and Deflector processing facility.


Owners

Source: p. 32
CompanyInterestOwnership
Silver Lake Resources Ltd. 100 % Indirect
Silver Lake Resources controls a 100% interest in M59/442 and M59/356 via its 100% owned subsidiaries Deflector Gold Pty Ltd and Gullewa Gold Project Pty Ltd respectively.

Silver Lake (Deflector) Pty Ltd (a wholly owned subsidiary of Silver Lake Resources Ltd) operate the Deflector Gold Copper Mine.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Orogenic
  • Vein / narrow vein


Summary:

The deposit type is classified as a hybrid Archean orogenic gold-copper deposit within the Gullewa greenstone sequence. The deposit comprises a series of en-echelon veins hosted within a flexure in the greenstone stratigraphy. Locally, the mineralisation is hosted in five main vein sets, the Western, Central, Da Vinci, Contact and Deflector South West Lodes. Ongoing work at Deflector Southwest indicates that it is likely the continuous strike extension of Western domain. The main lodes are narrow, sub-parallel, fault-hosted, quartz-sulphide veins within a thick sequence of high-Mg basalt intruded by a series of dacitic, dolerite, and lamprophyric dykes. The mafic sequence is bound in the east by a volcanic-clastic unit, and in the west by an ultramafic unit. The metamorphic grade is defined as lower green-schist facies. The Deflector resource extents are 1,700m strike, 430m across strike and 630m below surface and open at depth. These extents host approximately 56 known ore zones (ore domains). The ore zones vary between 0.3 to 5m in width. Domain continuity was extrapolated to half the average drill spacing.


Mining Methods

  • Longhole open stoping
  • Cemented backfill


Summary:

Mining at Deflector currently utilizes twin boom jumbos for ore development and longhole stoping between sill drives.

Underground
Ore lodes are accessed underground via a 5.3mW x 5.5mH, 1:7 decline centrally located along strike.

Level cross-cuts are mined to the east and west of the decline at 17 to 20m vertical intervals with ore development headings driven along strike to the lateral economic extents of lodes. Ore is mined using top-down mechanised open stoping methods on a shallow chevron retreat (when viewed in long section), leaving a variety of island, rib and sill pillars for stability. Localised portions of the upper mine will be extracted using a bottom-up mechanised open stoping method with cement and unconsolidated rock backfill.

All development has had 10%-15% overbreak applied, depending on drive type and location, as well as 100% mining recovery. All stoping has 0.5m hanging wall and 0.5m footwall dilution. The development overbreak estimation is based on 12 months actual data from July to April 2021. Stopes were designed as diluted shapes. Mining recovery is 95% for stopes with no island pillars, and 87.5% for stopes where an island pillar, 4.8mL x 6.0mH that will remain in-situ, is required. Minimum stope width has been applied based upon the lode being mined. Minimum mining widths are 2.5m for Western and Da Vinci Lodes, 2.3m for Central and Contact Lodes, 2.2 for Link Lode and 2.2 for Southwest Lodes. These widths are ........


Crushing and Grinding
Flow Sheet: Source

Regrind and Classification
The regrind circuit will consist of a single stage ball mill in closed circuit with a hydrocyclone cluster.

Flotation tailings will be directed to a high rate thickener to increase the density of the slurry prior to regrinding. Flocculant will be pumped to thickener feed and diluted (by a factor of ten) before addition. Clarified thickener overflow will gravitate to the leach thickener overflow tank.

Thickened underflow will be pumped to the regrind mill. The regrind mill will be a 2.85 (inside shell) x 4.5 (effective grinding length) overflow ball mill relocated from Andy Well. The mill will operate with the maximum ball load of 34% to maintain a motor power draw of 430 kW. Media addition to the mill will be via a ball loading kibble.

Slurry passing through the mill will flow into the Regrind Mill Discharge Hopper where it will be combined with the regrind gravity tails. Process water will be added to the hopper to achieve the correct density prior to being pumped to the Regrind Cyclones. The Regrind Cyclones will classify the ground slurry, with the cyclone overflow reporting to the each circuit and the cyclone underflow to the Regrind Mill for further regrinding. A portion of the cyclone underflow will report to the regrind gravity screen.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits202220212020201920182017
Gold Metal in ore koz  ......  Subscription required  ......  Subscription required
Copper Metal in ore t  ......  Subscription required  ......  Subscription required
Gold Metal in conc./ dorĂ© koz  ......  Subscription required  ......  Subscription required6549
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required
Gold Equivalent Metal in conc./ dorĂ© oz  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics20222021202020192017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required633,896 t429,614 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required607,116 t444,987 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required480,000 t
Subscription required - Subscription is required.

Combined reserves/resources are reported under Deflector Operation


Commodity Production Costs:

CommodityUnits2020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold AUD 1,190 / oz†   1,018 / oz†  
† Net of By-Product.

Financials:

Units20202017
Revenue M AUD  ......  Subscription required 97.3  
Pre-tax Income M AUD -17.9  
EBITDA M AUD  ......  Subscription required



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 9, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 9, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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