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Australia
Duketon South Operation (Garden Well Mine, Garden Well South Project, Rosemont Mine)

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 Location:
81 km N from Laverton, Western Australia, Australia

  Address:
Level 2, 516 Hay Street
Subiaco
Western Australia, Australia
6008
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Fax+61-8-94-42-2290
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Open stoping
Production Start...
Mine Life6 years (as of Jan 1, 2022)
The Duketon South Operations (‘DSO’) includes the Garden Well, Rosemont, Erlistoun, Tooheys Well, Baneygo and other satellite projects in proximity to the Garden Well and Rosemont processing plants.


Owners

Source: p. 48
CompanyInterestOwnership
Regis Resources Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Orogenic
  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

Garden Well.
Garden Well is located on the eastern limb of the Erlistoun syncline of the Duketon Greenstone Belt. The gold of the Garden Well Deposit occurs as supergene mineralisation within upper Archaean regolith and as hypogene mineralisation in fresh rock. No significant amounts of gold occur in the transported quaternary clay sequence.

The gold is associated with intensely sheared and folded ultramafic and shale units that have been hydrothermally altered to a silica- carbonate-fuchsite-chlorite-pyrite-arsenopyrite assemblage, and underlying chert units.

The gold mineralisation trends roughly north- south over a distance of 2,100m and dips 50º to 60º east which is sub-parallel to the ultramafic-sediment contact.

Rosemont.
Rosemont gold deposit is hosted in a quartz dolerite zone of a dolerite sill intruding ultramafic and argillaceous sedimentary units of the western limb of the Erlistoun Syncline in the Duketon Greenstone Belt.

Gold mineralisation is associated with brittle fracturing and quartz albite sericite carbonate sulphide alteration within the quartz dolerite. Most gold occurs below the weathered profile in saprock and fresh rock with the upper saprolite being leached of gold.

The mineralisation trends NNW over a strike length of 4.9km and dips steeply to the east and west, varying along strike.

Erlistoun.
Erlistoun is an Archaean orogenic gold deposit hosted in narrow quartz vei ........


Mining Methods

  • Truck & Shovel / Loader
  • Open stoping


Summary:

The mining method assumed in the Ore Reserve study is the same as that currently employed at the Rosemont, Garden Well and Erlistoun Gold Mines, which utilises drill and blast, excavator and truck open pit mining.

The Rosemont operations include Rosemont open pit and underground mine, as well as Baneygo open pit. The Rosemont and associated surface deposits are mined using conventional open pit mining truck and shovel methods. The Rosemont underground produces approximately 600Ktpa and is mined using mechanised open stoping.


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required254223229
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required6.98 Mt7.4 Mt7.48 Mt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required21.3 Mbcm15,060,386 bcm17,783,273 bcm
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required6.45 Mt6.79 Mt6.83 Mt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required7.8 5.3 6.3
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Reserves at December 31, 2021:
Resources are reported at cut-off grades of 0.4 g/t Au for open-pit and Garden Well Underground reported at an Economic cutoff of 1.8g/t, Rosemont Underground reported at an economic cutoff of 2.0g/t.
Reserves are reported at cut-off grades not less than 0.5 g/t Au for open-pit and 2.0 g/t Au for underground, that vary according to oxidation and lithology domains.

CategoryTonnage CommodityGradeContained Metal
Proven 12 Mt Gold 0.5 g/t 210 koz
Probable 24 Mt Gold 1.3 g/t 1,020 koz
Proven & Probable 36 Mt Gold 1 g/t 1,230 koz
Measured 18 Mt Gold 0.9 g/t 510 koz
Indicated 83 Mt Gold 1.1 g/t 2,840 koz
Inferred 11 Mt Gold 1.4 g/t 490 koz
Total Resource 112 Mt Gold 1.1 g/t 3,850 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 751 / oz   867 / oz   795 / oz  
Total cash costs Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 826 / oz   940 / oz   867 / oz  
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 932 / oz   1,017 / oz   924 / oz  
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Financials:

Units2022202120202019201820172016
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 58.7   46.6   41.4  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 428.9   372.2   375.5  
Operating Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 177.2   127.5   137.9  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
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Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Corporate Presentation 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 2019
................................... Subscription required 2019
Annual Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Annual Report 2016
Other 2011
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