Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Processing |
- Gravity separation
- Agitated tank (VAT) leaching
- Concentrate leach
- Carbon in leach (CIL)
- Elution
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
The Duketon South Operations (“DSO”) includes the Garden Well, Rosemont, Erlistoun, Tooheys Well, Baneygo and other satellite projects in proximity to the Garden Well processing plant. |
Source:
p. 90
Company | Interest | Ownership |
Maca Ltd.
(operator)
|
|
|
Regis Resources Ltd.
|
100 %
|
Indirect
|
Duketon Resources Pty Ltd.
|
100 %
|
Direct
|
Rosemont Gold Mines Pty Ltd.
|
100 %
|
Direct
|
Deposit Type
- Breccia pipe / Stockwork
- Orogenic
Summary:
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.
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.
Erlistoun.
Erlistoun is an Archaean orogenic gold deposit hosted in narrow quartz veins within sheared intermediate to felsic intrusions located on the eastern limb of the Erlistoun Syncline. The host units are bounded by a granodiorite on the east and adjacent to a dolerite and ultramafic unit to the west. Gold mineralisation is hosted in quartz veins and associated shear zones with high grade pods of gold mineralisation associated with weathering event horizons. Gold mineralisation trends N to NNE over a strike length of 1.9km and dips shallowly at 40° to the west.
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.
Processing
- Gravity separation
- Agitated tank (VAT) leaching
- Concentrate leach
- Carbon in leach (CIL)
- Elution
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Flow Sheet:
Summary:
The Duketon South Operations (“DSO”) includes the Garden Well, Rosemont, Erlistoun, Baneygo and other satellite projects in proximity to the Garden Well processing plant.
Recoveries & Grades:
Commodity | Parameter | 2019 | 2018 | 2017 | 2016 | 2015 |
Gold
|
Recovery Rate, %
| ......  | ......  | ......  | ......  | ......  |
Gold
|
Head Grade, g/t
| 1.4 | 1.24 | 1.1 | 1.08 | 1.1 |
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Reserves at March 31, 2019:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
7.6 Mt
|
Gold
|
0.89 g/t
|
219 koz
|
Probable
|
30.9 Mt
|
Gold
|
1.37 g/t
|
1,359 koz
|
Proven & Probable
|
38.5 Mt
|
Gold
|
1.27 g/t
|
1,578 koz
|
Measured
|
9.4 Mt
|
Gold
|
0.87 g/t
|
263 koz
|
Indicated
|
98.6 Mt
|
Gold
|
1.02 g/t
|
3,245 koz
|
Inferred
|
17.9 Mt
|
Gold
|
1.04 g/t
|
599 koz
|
Total Resource
|
125.9 Mt
|
Gold
|
1.01 g/t
|
4,108 koz
|
Aerial view:
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