Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Processing |
- Gravity separation
- Carbon re-activation kiln
- Smelting
- Consep Acacia Reactor
- Centrifugal concentrator
- Crush & Screen plant
- Concentrate leach
- Agitated tank (VAT) leaching
- Carbon in leach (CIL)
- Carbon in pulp (CIP)
- AARL elution
- Carbon adsorption-desorption-recovery (ADR)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
Source:
p. 16
Company | Interest | Ownership |
Evolution Mining Ltd.
|
100 %
|
Indirect
|
Evolution Mining Mungari Pty Ltd.
(operator)
|
100 %
|
Direct
|
Evolution operates wholly-owned mine Mungari in Western Australia.
Evolution Mining Ltd (EVO) operates the Mungari Gold Operations (MGO) including the Frog’s Leg and White Foil gold projects.
Evolution Mining (Mungari) Pty Ltd is a wholly owned subsidiary of Evolution Mining Limited.
Summary:
Mineralisation at White Foil is hosted within a brittle quartz gabbro unit. The gold is associated with quartz stockworks. Structural studies confirms the presence of two main vein sets at White Foil with a dominant moderately NNW dipping set (51º/346º dip and dip direction) and a secondary SSE dipping set (56º/174º dip and dip direction). An identifiable systematic bias associated with drilling direction has not been established. The main strike to the gabbro unit is NNW-SSE and it plunges steeply towards the NNE. The predominant drill direction was to the SE.
The White Foil gold deposit is a quartz stockwork hosted in a gabbro. The gabbro is differentiated broadly into a quartz-rich phase in the west. This quartz gabbro unit is the most hydrothermally altered unit and contains the bulk of the gold mineralisation. The White Foil deposit is bounded to the west by hangingwall volcaniclastic rocks. To the east mineralisation becomes irregular and uneconomic in the more melanocratic phase of gabbro. Mineralisation is controlled by sheeted systems of stockwork veining, which has imparted strong alteration and sulphidation to the quartz gabbro.
Summary:
White Foil is the open pit mine at the Mungari operations and utilises conventional drill and blast, load and haul methods.
Flow Sheet:
Processing
- Gravity separation
- Carbon re-activation kiln
- Smelting
- Consep Acacia Reactor
- Centrifugal concentrator
- Crush & Screen plant
- Concentrate leach
- Agitated tank (VAT) leaching
- Carbon in leach (CIL)
- Carbon in pulp (CIP)
- AARL elution
- Carbon adsorption-desorption-recovery (ADR)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Flow Sheet:
Summary:
Three stage crushing, ball mill, gravity and carbon-in-pulp (CIP).
-Recovery: 90 - 93%
Leaching:
- Leaching: 2 x 1,140 m3 tanks;
- Adsorption: 6 x 750 m3 tanks;
- Elution: split AARL;
- Electrowinning: 3 x Consep tanks [2 x carbon-in-leach (CIL), 2 x gravity].
Gravity circuit:
- Concentrator: 2 x Knelson;
- Intensive Leach: Consep Acacia.
Recoveries & Grades:
Commodity | Parameter | 2020 | 2019 | 2018 |
Gold
|
Head Grade, g/t
| ......  | ......  | 1.61 |
Production:
Commodity | Units | 2020 | 2019 | 2018 |
Gold
|
koz
| ......  | ......  | 26 |
All production numbers are expressed as metal in ore.
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Operational Metrics:
Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Ore tonnes mined
| ......  | ......  | 1,640 kt | 501 kt | 1,044 kt | 1,121 kt |
Waste
| ......  | ......  | 5,436 kt | 3,086 kt | | |
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Reserves at December 31, 2020:
The Ore Reserve reported at a cut-off of 0.75 g/t.
The Mineral Resource reported at a cut-off of 0.5 g/t.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
9.68 Mt
|
Gold
|
1.35 g/t
|
419 koz
|
Indicated
|
37.55 Mt
|
Gold
|
1.19 g/t
|
1,443 koz
|
Inferred
|
6.8 Mt
|
Gold
|
1.35 g/t
|
296 koz
|
Total Resource
|
44.36 Mt
|
Gold
|
1.22 g/t
|
1,739 koz
|
Aerial view:
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