Northern Star Resources Limited announced positive progress from its FY23 exploration program, designed to support the Company's five-year profitable growth strategy. Northern Star will provide an Annual Mineral Resource and Ore Reserve Statement ended 31 March 2023 in 2H23. KALGOORLIE OPERATIONS: The Kalgoorlie region of Western Australia's Goldfields has been a prolific region for gold production and exploration success.

Northern Star's ongoing exploration investment in this highly prospective region continues to deliver strong drilling results, driving continued growth in mine production profiles at KCGM and the Kalgoorlie region. KCGM Operations: Fimiston North: Drilling from the Golden Pike underground drill drive has continued at Fimiston North with the current phase of drilling designed on a 200m x 200m grid pattern to test the northern extensions of known lodes from the Fimiston open pit. The initial drill program has successfully overcome the technical challenges of drilling through numerous historical voids to intersect mineralised target structures, creating a significant opportunity to test larger areas around historical mining areas.

Significant intersections of "Fimiston-style" gold mineralisation characterised by quartz veinlets associated with shearing and tellurides, occur both on the hangingwall and footwall margins of these voids as well as in intact "virgin" lodes. The continuing drilling program is infilling the drill spacing to a 100m x 100m grid pattern to further refine geology, resource potential and the extent of void models in this highly prospective area. Significant Fimiston North underground drilling intersections received include: Significant drill results include: All widths are estimated true width: FNUD0049: 4.7m @ 22.9g/t; FXGD02B2: 10.2m @10.2g/t, 13.4m @2.0g/t; FNUD0050: 13.8m @ 3.0g/t, 2.3m @ 13.5g/t; FNUD0040: 7.28m @ 6.7g/t, 3.35m @ 9.8g/t, 4.41m @ 6.4g/t, 8.7m @ 2.6g/t, 3.6m @ 3.3g/t; FNUD0038: 7.5m @ 4.1g/t, 0.56m @ 54.8g/t; FNUD0062: 0.38m @ 66.3g/t, 8.68m @ 3.2g/t; Fimiston South Open Pit: The Fimiston South cutback encompasses the southern end of the world-class `Super Pit' on the Golden Mile deposit in Kalgoorlie.

The current existing pit design for the Super Pit includes an Ore Reserve of 104Mt @ 1.7g/t for 5.9Moz (at 31 March 2022) as well as a significant Inferred Mineral Resource. Recent surface and in-pit drilling programs have continued to target these Inferred Resource areas to confirm the continuity of mineralised lodes and upgrade these areas, potentially adding significant ore reserves not currently in the mine plan. Drilling continues to outline significant zones of Fimiston-style mineralisation together with several quartz stockwork zones analogous to Mt Charlotte-style mineralisation.

The ongoing drilling campaign is successfully defining these zones to enhance the geological interpretation and confirm grade continuity of the Inferred Resource areas. Significant Fimiston South drilling intersections received include: Significant drill results include: All widths are estimated true width: CTGD052A1: 8.2m @ 9.6g/t, 4.5m @ 23.2g/t; HOGD038: 7.8m @ 9.8g/t, 5.4m @ 3.5g/t, 5.0m @ 3.6g/t; MA04069: 6.6m @ 5.6g/t; CTGD052C1: 6.5m @ 4.9g/t, 3.3m @ 3.9g/t, 6.0m @ 2.8g/t; HMGD042: 8.94m @ 5.5g/t, 2.95m @ 3.8g/t; Mt Charlotte - Maritana Orebody: The Maritana Orebody (MOB) is part of the existing Mt Charlotte underground operation located 3km north of the Fimiston processing plant. The MOB is separated from the Reward (ROB) and Charlotte (COB) orebodies by the Maritana Fault.

Gold mineralisation occurs in broad (15 to 20 metres wide), shallow and steeply dipping quartz stockwork vein sets developed within the Golden Mile dolerite units that are suited to bulk mining methods such as sub-level caving. Recent underground drilling from the 1790 Level targeting the southern extents of the lower MOB, has returned highly encouraging results identifying a significant new lower zone of gold mineralisation north of the Golden Pike Fault.