Overview
Stage | Production |
Mine Type | Stockpile |
Commodities |
|
Mining Method |
|
Processing |
- Gravity separation
- Intensive Cyanidation Reactor (ICR)
- Centrifugal concentrator
- Carbon re-activation kiln
- Smelting
- Concentrate leach
- Agitated tank (VAT) leaching
- Carbon in leach (CIL)
- Elution
- Carbon adsorption-desorption-recovery (ADR)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
At present Kailis open pit is in “care and maintenance”. All required Environment studies has been completed for current Reserve pit. All statutory government approvals including clearing permit, project management, operating licence and groundwater licences have been in granted. The existing Mining Proposal will be revised and resubmitted to accommodate future reserve pit. |
Source:
p. 146
The mining leases are 100% held and managed by Northern Star Resources Limited.
Summary:
Gold mineralisation at Kailis - Trump is hosted in quartz-sericite schist within a broad east-west trending, shallow to moderately dipping (40-50 degrees SSE) shear zone with a strike length in excess of 1800m. Mineralised intervals are often narrow (1-3m) but thicken to 8-20m in places. The shear zone encapsulates a high nugget mineralisation style with common occurrences of visual gold. Structural studies identified narrow sub vertical NE-SW trending quartz vein sets/structures that crosscut the main shear zone as possible controls on high grade mineralisation. The best gold grades tend to occur in the oxide and transitional zones with lower grades in the fresh rock. Mineralisation is open at depth but closed along strike.
The Kailis-Trump resource is contained within a + 40m wide shear zone which extends over a strike length of approximately 1,800m from 174,400mE to 176,200mE (MGA), and dips 30° to the south and flattens as move east toward Trump. Mineralisation is open at depth and to the west. It sits primarily within the oxide profile with economic mineralisation occurring at 30m below surface to 120m depth.
Summary:
The Kailis deposit has successfully been mined by open pit in the past and in Stage 1 and Stage 2.
The mining method employed at Kailis open pit was conventional open pit with hydraulic excavator and dump truck fleet, and drill and blast activity.
The Kailis reserve pit is designed as a successive cutback to the previously mined reserve. At present the mine is in “care and maintenance”. The cutback will be mined in appropriate manner such that it meets the operational efficiency, safety and production rates.
Processing
- Gravity separation
- Intensive Cyanidation Reactor (ICR)
- Centrifugal concentrator
- Carbon re-activation kiln
- Smelting
- Concentrate leach
- Agitated tank (VAT) leaching
- Carbon in leach (CIL)
- Elution
- Carbon adsorption-desorption-recovery (ADR)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Flow Sheet:
Summary:
Kailis previously mined Ore is currently being treated Thunderbox processing plant.
The plant is a conventional carbon-in-leach (CIL) gold circuit. It comprises a gravity circuit comprising centrifugal style gravity concentrators (2 × 30” Knelson Concentrators) and intensive leaching of the gravity concentrate. The gravity tailings product is processed through a six-stage leach/CIL circuit, pressure Zadra elution and refinery facility to produce gold doré.
Arsenopyrite is present in the ore and minor levels of arsenic are solubilised in the plant solutions. The arsenic levels are monitored on a regular basis and infrastructure exists for the addition of ferric sulphate where the levels impact the environment/exceed the environmental limits. The ferric sulphate is added to precipitate the free arsenic as ferric arsenate thereby locking the arsenic in the plant tailings for storage.
Tailings are thickened and pumped to a dual cell tailings storage facil ........

Recoveries & Grades:
Commodity | Parameter | 2019 | 2018 |
Gold
|
Head Grade, g/t
| ......  | 2.31 |
Production:
Commodity | Units | 2019 | 2018 |
Gold
|
oz
| ......  | 65,000 |
All production numbers are expressed as metal in ore.
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Operational Metrics:
Metrics | 2020 | 2019 | 2018 |
Waste
| ......  | 2,489,391 t | |
Ore tonnes mined
| ......  | 147,864 t | 871,000 t |
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Reserves at June 30, 2020:
The Ore Reserve is estimated at a cut-off grade of 0.60g/t.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
79 kt
|
Gold
|
2 g/t
|
5 koz
|
Indicated
|
490 kt
|
Gold
|
2.3 g/t
|
36 koz
|
Aerial view:
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