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Australia
Rosemont Mine (Duketon South Operation)

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

  Address:
Level 2, 516 Hay Street
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
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 Life2024
The Rosemont operations include Rosemont open pit and underground mine, as well as Baneygo open pit.


Owners

Source: p. 17
CompanyInterestOwnership
Regis Resources Ltd. 100 % Indirect
Current registered holders of the tenements are Regis Resources Ltd & Duketon Resources Pty Ltd (100% subsidiary of Regis Resources Ltd). Normal Western Australian state royalties apply plus there is a 2% Royalty to Franco Nevada.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

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.

The geology at Rosemont has gold hosted in a steeply dipping quartz-dolerite unit intruding into a mafic-ultramafic sequence. Gold mineralisation is within a brittle quartz-dolerite phase of the Rosemont Dolerite, primarily occurring within discrete, steeply dipping, quartz-dolerite paralleled, en-echelon and stacked vein structures. The quartz-dolerite varies from 5 metres, up to 100 metres wide.


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 Gold Mine, which utilises drill and blast, excavator and truck open pit mining. The existing pit has been designed to be developed in a series of progressive cutbacks. The Ore Reserve pit is designed as a further series of extensional cutbacks to the existing pit.

Geotechnical and hydrogeological recommendations have been applied during pit optimisation and incorporated in design with ongoing reviews. Mining dilution and ore loss factors have been dealt with in the estimation of the OK Mineral Resource.

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:

- subscription is required.


Production:

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required1041079172
All production numbers are expressed as metal in ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required2.5 Mt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1.8 Mt2.1 Mt2.2 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Resources are reported at cut-off grade 0.4 g/t Au for open-pit and 2.0 g/t Au for underground.
Reserves are reported at cut-off grades of 0.6 g/t Au for open-pit and 2.0 g/t Au for underground.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 1 Mt Gold 0.7 g/t 20 koz
Probable In-Situ (OP) 2 Mt Gold 1.5 g/t 80 koz
Probable In-Situ (UG) 1 Mt Gold 3.3 g/t 120 koz
Proven & Probable In-Situ (OP) 3 Mt Gold 1.2 g/t 100 koz
Proven & Probable In-Situ (UG) 1 Mt Gold 3.3 g/t 120 koz
Measured In-Situ (OP) 3 Mt Gold 0.9 g/t 80 koz
Indicated In-Situ (OP) 7 Mt Gold 1 g/t 220 koz
Indicated In-Situ (UG) 1 Mt Gold 4.9 g/t 220 koz
Inferred In-Situ (UG) 1 Mt Gold 5.9 g/t 120 koz
Total Resource In-Situ (OP) 10 Mt Gold 1 g/t 300 koz
Total Resource In-Situ (UG) 2 Mt Gold 5.2 g/t 340 koz


Pipelines
Source: Subscription required


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 is required.

Staff:

EmployeesYear
Subscription required 2022
Subscription required 2021
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Sustainability 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Other 2018
Other 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2015
Other 2011
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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