Overview
Stage | Production |
Mine Type | Open Pit & Underground |
Commodities |
|
Mining Method |
- Truck & Shovel / Loader
- Longhole open stoping
- Cemented (undefined) backfill
|
Production Start | ... |
Mine Life | 2024 |
The Rosemont operations include Rosemont open pit and underground mine, as well as Baneygo open pit, and crushing and grinding Plant.
On June 1, 2020, commercial production was announced at Rosemont Underground. |
Source:
p. 21
Current registered holders of the tenements are Regis Resources Ltd & Duketon Resources Pty Ltd (100% subsidiary of Regis Resources Ltd).
Contractors
- Subscription is required.
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
- Longhole open stoping
- Cemented (undefined) backfill
Summary:
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.
Open Pit
At the Rosemont Gold Mine 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.
Underground
There are two mining methods proposed to extract ore from the Rosemont Underground deposit. Rosemont South and Rosemont Central are planned to be extracted using a top-down long-hole open stoping method with no backfill, and with pillars to be left for support. Rosemont Main is also planned to be extracted using a long-hole open stoping method, however sequenced as bottom-up and to be filled using a combination of cemented rock fill and waste rock fill to allow a full extraction of the higher-grade orebody.
Source:
Source:
- subscription is required.
Flow Sheet:
Summary:
- subscription is required.
Source:
Production:
Commodity | Units | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
Gold
|
koz
| ...... | ...... | 104 | 107 | 91 | 72 |
All production numbers are expressed as metal in ore.
- Subscription is required.
Operational Metrics:
Metrics | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
Ore tonnes mined
| ...... | 1.8 Mt | 2.1 Mt | 2.2 Mt | 2.3 Mt | 1.8 Mt |
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.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | OreType | Tonnage | Commodity | Grade | Contained 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
|
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.