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.

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.

The process consists of a double toggle jaw crusher followed by a SAG and Ball milling circuit.

Metso Outotec has been chosen to supply its Premier SAG Mill for Northern Star Resources’ Thunderbox gold mine expansion. The expansion should double the throughput of the Thunderbox operation.

Kailis previously mined Ore is currently being treated Thunderbox processing plant.

The Ore Reserve will be treated at the established Thunderbox processing facility which is currently processing ore from the Thunderbox open pit and underground operations. The facility is a conventional crushing, gravity circuit, grind, and CIL (carbon in leach) plant and is appropriate for the extraction of gold from free milling mineralisation.

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 ........