Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
|
Processing |
- Gravity separation
- Intensive Cyanidation Reactor (ICR)
- Centrifugal concentrator
- Agitated tank (VAT) leaching
- Carbon in leach (CIL)
- Elution
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
The Daisy Complex production sourced from Haoma West, Lower Prospect, Easter Hollows and remnant mining areas. In FY22, ore from the Daisy Mining Centre will continue to be sourced from Haoma West and Lower Prospect lodes. |
Latest News | Silver Lake halts operations at Daisy Complex June 10, 2021 |
Source:
p. 38
The mining operations for Daisy Complex occurs on these granted Mining Leases – M26/129, M26/251, M26/38, M26/389, M26/825 and are held by Silver Lake Resources Limited.
Deposit Type
- Orogenic
- Vein / narrow vein
Summary:
The deposit type is classified as an orogenic gold deposit within the Norseman-Wiluna greenstone sequence. The accepted interpretation for gold mineralisation is related to (regional D2-D3) deformation of the stratigraphic sequence during an Archaean orogeny event.
Locally, the mineralisation is characterised as a deformed vein, hosted within intermediate volcanic and volcaniclastic units and closely associated with felsic intrusive rock types of the Gindalbie Terrane. The metamorphic grade is defined as lower green-schist facies.
The Daisy Complex resource extents are 2,200m strike, 700m across strike and 1,200m down dip and open at depth. These extents host approximately 78 known ore zones (ore domains).
Summary:
Mining at Daisy Complex utilizes a single boom jumbo for ore development and longhole stoping between sill drives. All stope panels are assumed to have a minimum width of 2.4m and variable dilution is added at 0.0 g/t when mining each stoping block.
Major assumption made for optimisation parameters include minimum stoping widths of 2.4m and maximum stope height of 15m. Minimum mining width parameters for hand held and mechanised mining were set at 2.4 metres, based on current experience at the Daisy Complex. An additional 20% dilution factor is then applied. Mining recovery factor of 80% was applied to account for ore loss in pillars and unplanned ore loss. Infrastructure to support mining operations is already in place at the Daisy Complex.
Processing
- Gravity separation
- Intensive Cyanidation Reactor (ICR)
- Centrifugal concentrator
- Agitated tank (VAT) leaching
- Carbon in leach (CIL)
- Elution
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Source:
Summary:
Daisy Complex feeds the 1.3Mtpa Randalls mill.
Reasonable assumptions for metallurgical extraction are based on metallurgical processing the Daisy Complex ore through the Randalls (CIL) process facility. The current recoveries for gold are greater than 94%.
Recoveries & Grades:
Commodity | Parameter | 2021 | 2020 | 2019 | 2018 | 2017 |
Gold
|
Head Grade, g/t
| ......  | ......  | ......  | 6.4 | 7 |
Production:
Commodity | Units | 2021 | 2020 | 2019 | 2018 | 2017 |
Gold
|
oz
| ......  | ......  | ......  | 68,033 | 67,106 |
All production numbers are expressed as metal in ore.
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Operational Metrics:
Metrics | 2021 | 2020 | 2019 | 2018 | 2017 |
Ore tonnes mined
| ......  | ......  | 298,357 t | 328,941 t | 300,201 t |
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Reserves at June 30, 2021:
Cut-off parameters are 2.0 g/t Au for resource reporting.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
94 kt
|
Gold
|
8.1 g/t
|
25 koz
|
Probable
|
344 kt
|
Gold
|
8.8 g/t
|
98 koz
|
Proven & Probable
|
438 kt
|
Gold
|
8.7 g/t
|
122 koz
|
Measured
|
582 kt
|
Gold
|
6.7 g/t
|
125 koz
|
Indicated
|
2,425 kt
|
Gold
|
6.3 g/t
|
492 koz
|
Inferred
|
3,017 kt
|
Gold
|
8.1 g/t
|
790 koz
|
Total Resource
|
6,024 kt
|
Gold
|
7.3 g/t
|
1,406 koz
|
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