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Australia
Deflector Operation (Deflector Mine, Rothsay Mine)

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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
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  • Geology
  • Mining
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  • Production
  • Reserves
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  • 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 comprised the Deflector and Rothsay underground mines and Deflector processing facility.


Owners

Source: p. 32,42
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 Resources controls a 100% interest in tenements M59/39 and M59/40 (Rothsay).

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

Contractors

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Deposit Type

  • Orogenic
  • Vein / narrow vein


Summary:

The Deflector Region Operation is comprised the Deflector and Rothsay underground mines. Deflector 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. Rothsay The Rothsay Gold Mine is located within the Warriedar Greenstone gold belt, an Archaean sequence of mafic, ultra-mafic, meta-volcanic and sedimentary rocks folded in an anticlinal formation which plunges and strikes to the north-northwest with steeply dipping limbs. The deposit is hosted in three discrete areas and within five in ........


Mining Methods

  • Longhole open stoping
  • Cemented backfill


Summary:

Deflector
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. T ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits202220212020201920182017
Gold Metal in conc./ dorĂ© koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required6549
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent Metal in conc./ dorĂ© oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
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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
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Reserves at June 30, 2022:
A reserve cut-off grade of $173NSR has been used for Deflector Underground.
A reserve cut-off grade of $222NSR has been used for Deflector Southwest.
A reserve cut-off grade of 2.3g/t has been used for Rothsay.

Cut-off parameters are 1.0g/t Au in the upper 100m of the deposit and 2.0g/t for the material 100m below surface for the resource estimate.

CategoryTonnage CommodityGradeContained Metal
Proven 601 kt Gold 5.5 g/t 106 koz
Proven 540 kt Copper 0.2 % 1,200 t
Probable 2,389 kt Gold 5 g/t 384 koz
Probable 1,774 kt Copper 0.2 % 3,900 t
Proven & Probable 2,990 kt Gold 5.1 g/t 490 koz
Proven & Probable 2,314 kt Copper 0.2 % 5,100 t
Measured 567 kt Gold 13.8 g/t 252 koz
Measured 513 kt Copper 0.9 % 4,800 t
Indicated 1,928 kt Gold 13 g/t 805 koz
Indicated 1,347 kt Copper 0.7 % 9,200 t
Inferred 1,191 kt Gold 9.6 g/t 367 koz
Inferred 716 kt Copper 0.4 % 2,800 t
Total Resource 3,686 kt Gold 12 g/t 1,424 koz
Total Resource 2,576 kt Copper 0.7 % 16,800 t

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold AUD 1,190 / oz†   1,018 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2022202120202017
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 97.3  
Pre-tax Income M AUD -17.9  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 9, 2023
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....................... Subscription required ....................... Subscription required ....................... Subscription required Jul 27, 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 Nov 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 9, 2023
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Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... 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
Corporate Presentation 2018
Annual Report 2017
Corporate Presentation 2017
Press Release 2017
Press Release 2016
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