Earnings release
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ASX Announcement: NST 21 October 2026 Quarterly Report September 2026 KCGM mill tie-in complete and commissioning progressing as Northern Star welcomes new CEO September quarter performance • SLTIFR1 at 0.5 injuries per million hours worked • September quarter gold sold totalled 364koz at an AISC of A$3,217/oz (US$2,244/oz) • Net mine cashflow of A$210 million for the quarter with all three production centres generating positive net cash flows; Group underlying free cash flow of A$(31) million including A$113 million in corporate tax payments • FY27 guidance remains unchanged at 1,500-1,650koz gold sold at an AISC of A$3,050-3,450/oz • Cash and bullion of A$1,200 million (at 30 September 2026); A$500 million bank facilities utilised post quarter end to maintain targeted cash on hand • Hemi Project studies progressing in line with plan for Final Investment Decision late FY27 KCGM Mill Expansion Project update • Legacy plants shutdown on 21 September, with tie-in to the expanded plant completed on 28 September • Commissioning of the integrated plant is in its early stages; focus remains on establishing stable, sustained operating performance • Stage II (single processing hub) commissioning scheduled for early 2H FY27; expected to deliver a 1–2% recovery uplift and eliminate concentrate haulage between KCGM and Gidji Conference call details • Northern Star’s September quarterly conference call will be held today at 10:30am AEDT (7:30am AWST). The call can be accessed at: https://loghic.eventsair.com/985481/594164/Site/Register Suresh Vadnagra, who commenced as Managing Director & CEO on 5 October 2026 said: “The September quarter has delivered another major milestone for Northern Star with completion of the KCGM mill tie-in and commencement of commissioning of the integrated plant. Commissioning is progressing in line with expectations for this early stage. We have also had a solid start to FY27 across our operations, with all sites delivering in line with plan. "While I still have a lot to learn about our individual assets, we have a high-quality asset base and a strong foundation on which to grow. Consistent delivery will be fundamental to our success and will require strong operating discipline, clear accountability and a group-wide focus on costs, execution and capital discipline. "My immediate priority is to understand the business in parallel with focusing on completing the KCGM mill expansion safely and efficiently as well as ensuring consistent delivery across the portfolio." 1 1 SLTIFR (12-month moving average) is defined as Serious Lost Time Injury Frequency Rate.
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Overview Northern Star Resources Ltd (ASX: NST) is pleased to report its operational and financial results for the September 2026 quarter, with gold sold of 363,891oz at an all-in sustaining cost (AISC) of A$3,217/oz. September quarter performance by production centre: • Kalgoorlie: 193,540oz gold sold at an AISC of A$2,919/oz, with the KCGM mill tie-in completed late in the quarter and commissioning ongoing • Yandal: 117,631oz gold sold at an AISC of A$3,687/oz, driven by improved grades at Thunderbox • Pogo: 52,720oz gold sold at an AISC of US$2,307/oz, as planned processing plant and underground infrastructure works were undertaken For the September quarter, all-in costs (AIC) of A$4,647/oz2 were higher than the June quarter reflecting reduced gold sold due to grade and recovery impacts, primarily associated with Pogo and KCGM commissioning activities. Figure 1: Group Gold Sales and AISC koz A$/oz 203 210 228 194 91 105 124 118 53 66 82 53 2,937 2,709 2,651 3,217 Kalgoorlie Yandal Pogo AISC(A$/oz) Dec Q 2025 Mar Q 2026 Jun Q 2026 Sep Q 2026 0 100 200 300 400 500 600 0 400 800 1,200 1,600 2,000 2,400 2,800 3,200 Figure 2: FY27 Group guidance FY27 GUIDANCE UNITS KALGOORLIE YANDAL POGO(3) TOTAL Gold Sold koz 850-970 400-420 250-260 1,500-1,650 AISC A$/oz 2,800-3,300 3,900-4,200 US$1,850-1,950 3,050-3,450 Sustaining Capital A$M 850-915(4) Growth Capital: (i) Operational Growth Capital A$M 985-1,075(5) 70-100 US$60-80 1,150-1,300(6) (ii) KCGM Mill Expansion and Readiness A$M 350-470 - - 350-470 (iii) Hemi Project A$M - - - 200-250 Total Growth Capital A$M 1,335-1,545 70-100 US$60-80 1,700-2,020 Exploration A$M 230-250 NST: September 2026 Quarterly Activities Report 2 2 Excludes Hemi development capital (A$17M), corporate growth capital (A$2M), Hemi exploration spend (A$8M) and exploration for non-producing projects and regional sites (A$1M). 3 Pogo AISC and capital expenditure outlook converted at a currency rate of AUD:USD = 0.70. 4 Sustaining capital is included in the AISC calculation. 5 Majority of operational growth capital at Kalgoorlie Production Centre is directed towards accessing new mining areas including Fimiston South open pit cutback and underground development at Mt Charlotte and Fimiston. 6 Total includes A$5-10M of corporate growth capital expenditure.
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Outlook The Company’s FY27 guidance was announced on 20 August 2026. Refer to the Company's ASX announcement titled 'FY26 Financial Results' for full details of production, costs, capital expenditure and key assumptions. FY27 Group production is forecast at 1,500–1,650koz of gold sold at an AISC of A$3,050–3,450/oz. Production is expected to be weighted to the second half, reflecting the progressive ramp-up of KCGM’s expanded processing facility. KCGM is forecast to deliver 550–650koz gold sold. AISC is expected to improve through FY27. The guidance reflects portfolio inflation, higher royalties and oil price assumptions as well as the drawdown of lower-grade stockpiles. Sustaining capital expenditure is forecast at A$850–915 million. Total FY27 capital investment, including sustaining and growth capital, is forecast at A$2,550–2,935 million. Growth capital is focused on accessing future ore sources, completing the KCGM Mill Expansion Project and associated infrastructure, and advancing the Hemi Project. Exploration expenditure is forecast at A$230–250 million, focused on KCGM, Pogo and Hemi. A portion of capital expenditure remains discretionary and can be managed in line with operating performance and capital priorities. KCGM Mill Expansion Project - Kalgoorlie, Western Australia The KCGM Mill Expansion Project at the Fimiston Processing Plant is being delivered in two stages. Stage I replaces approximately 85% of the existing 13Mtpa processing capacity and increases total capacity to 27Mtpa. Stage II will consolidate processing at Fimiston, integrating processing that used to be performed at the Gidji facility into a single hub at KCGM. Stage I tie-in of the existing Fimiston circuit to the expanded plant was completed on 28 September, approximately two weeks later than anticipated due to minor commissioning-related issues associated with the thickener and ball mill. These issues have since been addressed. The commissioning period contributed to lower-than-expected milled tonnes, grade and recovery during the quarter. Commissioning of the integrated plant is in its early stages with focus remaining on establishing stable, sustained operating performance. Stage II construction is ongoing, with commissioning scheduled to commence in early 2H FY27. Stage II is expected to deliver a 1–2% recovery uplift and eliminate concentrate haulage between KCGM and Gidji, simplifying the processing circuit and supporting the long-term operating model. Commenting on KCGM Mill Expansion Project's progress, Northern Star Chief Technical Officer Steve McClare said: “The team has delivered a quality plant safely and to a very high standard. KCGM brings together a world-class processing facility, an exceptional orebody and a tier-1 location. "The focus now shifts to a successful ramp-up in order to realise the benefits of the investment and establish a simpler, more efficient operation.” Project capital expenditure KCGM Mill Expansion and Readiness capital expenditure was A$221 million in the September quarter (vs FY27 guidance of A$350-470 million). FY27 forecast spend remains within the stated guidance range. The expenditure breakdown was: • KCGM Mill Expansion Project: A$141 million in the September quarter, bringing total project spend to date (from 1Q FY24) to A$1,746 million (vs forecast total project spend of A$1.75-1.81 billion). • KCGM Readiness: A$80 million in the September quarter. NST: September 2026 Quarterly Activities Report 3
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Table 1: September quarter 2026 performance summary - by production centre 3 MONTHS ENDING SEP 2026 Units Kalgoorlie Yandal Pogo (7) Total Underground Mining Ore Mined Tonnes 1,637,419 1,353,152 297,047 3,287,618 Mined Grade g/t Au 2.2 2.2 5.9 2.5 Ounces Mined oz 116,723 94,136 56,356 267,215 Open Pit Mining Open Pit Material Moved BCM 10,824,208 3,398,242 — 14,222,450 Open Pit Ore Mined Tonnes 2,509,991 1,423,213 — 3,933,204 Mined Grade g/t Au 1.6 1.2 — 1.4 Ounces Mined oz 127,213 54,438 — 181,651 Processing Milled Tonnes Tonnes 4,077,866 2,210,403 294,700 6,582,969 Head Grade g/t Au 1.8 1.9 5.9 2.0 Recovery % 81 86 88 83 Gold Recovered oz 192,097 112,744 49,316 354,157 Gold Sold (1) oz 193,540 117,631 52,720 363,891 Average Price A$/oz 5,123 4,856 4,868 4,999 Revenue - Gold A$M 991 571 257 1,819 Gold Inventories Total Stockpiles Contained Gold oz 3,817,171 277,810 1,276 4,096,257 Gold in Circuit (GIC) oz 35,806 7,594 3,185 46,585 Gold in Transit oz 200 — — 200 Total Gold Inventories oz 3,853,177 285,404 4,461 4,143,042 Costs Underground Mining A$M 151 139 81 371 Open Pit Mining A$M 89 55 — 144 Stockpile Rehandle A$M 1 — — 1 Processing A$M 164 77 40 281 Site Services A$M 28 20 16 64 Ore Stock & GIC Movements A$M (24) 2 (1) (23) Royalties A$M 37 27 — 64 By-Product Credits A$M (6) (2) (1) (9) Cash Operating Cost A$M 440 318 135 893 Rehabilitation A$M 7 5 1 13 Corporate Overheads (2) A$M 23 14 4 41 Sustaining Capital (4) A$M 94 95 31 220 All-in Sustaining Cost A$M 564 432 171 1,167 Exploration (3) A$M 20 11 16 47 Growth Capital (4)(5) A$M 418 22 33 473 All-in Costs A$M 1,002 465 220 1,687 Mine Operating Cash Flow (6) A$M 433 160 90 683 Net Mine Cash Flow (6) A$M 15 138 57 210 Cash Operating Cost A$/oz 2,277 2,710 2,573 2,460 All-in Sustaining Cost A$/oz 2,919 3,687 3,260 3,217 All-in Costs(4)(5) A$/oz 5,183 3,968 4,191 4,647 Depreciation & Amortisation A$/oz 1,138 1,150 520 1,052 Non-Cash Inventory Movements A$/oz (139) (98) 37 (100) (1) During the quarter 39koz of gold concentrate was sold from KCGM. (2) Includes the non-cash share-based payments expenses in corporate overheads. (3) Excludes Hemi exploration spend (A$8M) non-producing projects and regional sites (A$1M). (4) A$55M of lease repayments are included in Sustaining Capex (A$220M) and A$24M in Growth Capex (A$473M). Lease repayments are included in cash flows from financing activities in the Consolidated Statement of Cash Flows included in the Company’s financial statements. (5) Excludes Hemi development capital (A$17M) and corporate growth capital (A$2M). (6) Mine Operating Cash Flow is calculated as Revenue, less Cash Operating Costs (excluding inventory movements) and Sustaining Capital. Net Mine Cash Flow is calculated as Mine Operating Cash Flow less Growth Capital. (7) Pogo Operations costs are presented in AUD which is the Group’s reporting currency. USD cost disclosure is presented in Table 10. September quarter AUD:USD exchange rate is 0.71. NST: September 2026 Quarterly Activities Report 4
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Operations Safety Performance Northern Star prioritises the safety and wellbeing of our people. Safety is a Core Value and our commitment is consistently reflected in our strong safety performance. The end-of-quarter Serious Lost Time Injury Frequency Rate (SLTIFR) was 0.5 injuries per million hours worked, in line with the previous quarter's safety performance. Table 2: September 2026 Group safety performance (12-month moving average) Term Kalgoorlie Yandal Pogo Group SIFR 2.2 1.6 0.0 1.8 SLTIFR 0.5 0.8 0.0 0.5 Refer to Appendix 1 for additional operating and costs statistics on the individual operations. Kalgoorlie Production Centre (KCGM, Carosue Dam, Kalgoorlie Operations) The Kalgoorlie Production Centre generated mine operating cash flow of A$433 million and net mine cash flow of A$15 million after A$418 million of growth capital investment. Gold sold was 194koz at an AISC of A$2,919/oz, compared with 228koz at an AISC of A$2,589/oz in the June quarter. This reflects planned major shutdowns across the three operations and the commissioning of the expanded KCGM processing plant. AISC (A$/oz) was higher reflecting reduced gold sold due to grade and recovery impacts, primarily associated with KCGM commissioning activities. KCGM Operations: KCGM sold 112koz at an AISC of A$2,727/oz, compared with 136koz at an AISC of A$2,411/oz in the June quarter. The result reflected a planned shutdown and the commissioning of the new processing plant. Tie-in activities were completed late in the quarter. KCGM mine operating cash flow was A$274 million, with net mine cash flow of A$(115) million after A$389 million of growth capital investment primarily associated with the KCGM Mill Expansion Project. Mining continued to support future ore supply with Golden Pike North providing a source of higher-margin ore and waste stripping progressing at Fimiston South. Underground development continued at Fimiston and Mt Charlotte. Carosue Dam Operations: Carosue Dam has transitioned to underground mining, supplemented by stockpile processing, with lower-grade stockpiles providing the majority of mill feed. Early works commenced at Qena ahead of the planned development of the new underground mine, with ore currently expected to contribute from FY28. Kalgoorlie Operations: The South Kalgoorlie and Kanowna Belle mines continued to deliver consistent production outcomes, with higher throughput in the quarter partially offsetting lower grades. Figure 3: Kalgoorlie Production Centre - Gold Sales and AISC koz A$/oz Gold Sales (koz) AISC (A$/oz) Dec Q 2025 Mar Q 2026 Jun Q 2026 Sep Q 2026 0 50 100 150 200 250 0 400 800 1,200 1,600 2,000 2,400 2,800 3,200 NST: September 2026 Quarterly Activities Report 5
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Yandal Production Centre (Jundee, Thunderbox, Bronzewing) The Yandal Production Centre generated mine operating cash flow of A$160 million and net mine cash flow of A$138 million after A$22 million of growth capital investment. Gold sold was 118koz at an AISC of A$3,687/oz, compared with 124koz at an AISC of A$3,228/oz in the June quarter, reflecting planned major shutdowns across Jundee and Thunderbox. AISC (A$/oz) was higher reflecting increased sustaining capital expenditure at Thunderbox from deferred stripping at Bannockburn. Jundee Operations: Production was in line with plan with improved delivery consistency. Underground ore delivery at Jundee and Ramone exceeded plan, while recovery remained constrained by CIL tank availability (two of the three impacted tanks returned to service late September). Mined grade was in line with plan and is expected to increase in 2H, reflecting a higher contribution from Griffin, Cook and Armada ore sources. Ramone remains on track to complete mining in the December quarter. Thunderbox Operations: Thunderbox achieved record quarterly gold sales, reflecting improved feed grades, largely from the Orelia open pit, and a drawdown of gold in circuit. The paste plant at the Wonder underground mine was commissioned during the quarter, supporting orebody recovery and future mining productivity. Figure 4: Yandal Production Centre - Gold Sales and AISC koz A$/oz Gold Sales (koz) AISC (A$/oz) Dec Q 2025 Mar Q 2026 Jun Q 2026 Sep Q 2026 0 30 60 90 120 150 0 600 1,200 1,800 2,400 3,000 3,600 Pogo Production Centre The Pogo Production Centre generated mine operating cash flow of US$63 million and net mine cash flow of US$39 million after US$24 million of growth capital investment. Gold sold was 53koz at an AISC of US$2,307/oz, compared with 82koz at an AISC of US$1,384/oz in the June quarter, reflecting planned shutdowns, infrastructure works and lower mined grade. AISC (US$/oz) was higher reflecting reduced gold sold. The September quarter included a major processing plant shutdown and commencement of the rehabilitation of the underground ore bin and ore haulage infrastructure. Mining and processing rates were lower while the ore bin remained offline, with additional ore handling required underground and at surface. The underground ore bin and main ore haulage infrastructure are scheduled to return to service in late October, with mining rates expected to normalise through the December quarter. Mined grade of 5.9g/t in the September quarter was in line with plan and is expected to remain similar in the December quarter. Grades are forecast to increase in 2H as access to higher-grade stopes is established. Stoping ore contributed 64% to mill feed while mine development averaged 1,583 metres per month. NST: September 2026 Quarterly Activities Report 6
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Figure 5: Pogo Production Centre - Gold Sales and AISC Koz US$/oz Gold Sales (koz) AISC (US$/oz) Dec Q 2025 Mar Q 2026 Jun Q 2026 Sep Q 2026 0 20 40 60 80 0 400 800 1,200 1,600 2,000 2,400 Discovery and Growth For the September quarter, A$56 million was invested in exploration (FY27 YTD: A$56 million; vs guidance: A$230-250 million). Exploration activities have focused on high-priority in-mine projects across our three operating centres Kalgoorlie, Yandal and Pogo. Regional exploration activities also continued in the Pilbara, including early framework drilling and mapping across a number of key projects. Finance For the September quarter, the average gold sales price realised by Northern Star was A$4,999/oz to generate gold sales revenue of A$1,819 million. The September quarter non-cash inventory movement was a credit of A$37 million. Non-cash inventory movement is used for the reconciliation of AISC to EBITDA in the Profit and Loss statement. Cash and Bullion At 30 September, cash(1) and bullion(2) totalled A$1,200 million. Table 3: Cash and bullion Dec Q 2025 Mar Q 2026 Jun Q 2026 Sep Q 2026 Cash(1) A$M $865 $878 $1,018 $968 Bullion(2) A$M $311 $305 $217 $232 Total A$M $1,176 $1,183 $1,235 $1,200 (1) Cash is defined as cash and cash equivalents. (2) Bullion includes dore sold and is awaiting settlement. On 2 April, the Company announced a A$500 million on-market share buyback. There were no shares purchased during the quarter under the on-market share buyback program. The waterfall chart (Figure 6) highlights the September quarter movements in cash and bullion. Group underlying free cash flow from operations was A$(31) million. This includes A$76 million of equipment finance/leases and A$113 million in corporate tax payments. NST: September 2026 Quarterly Activities Report 7
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Figure 6: September quarter 2026 cash and bullion movements 1,235 809 (113) (600) (51) 1,280 (76) (4) 1,200 Opening Operating cashflow Income tax paid PP&E + Mine Properties Exploration Closing before M&A and Financing Equipment Finance/Leases Others (inc: FX) Closing Banking Facilities At 30 September, Northern Star held undrawn corporate bank facilities totalling A$1,750 million, comprising two equal tranches maturing in March 2030 and March 2031. The Group has added a A$500 million tranche to its revolving credit facilities, maturing in October 2029, increasing total facilities to A$2,250 million. On 9 October 2026, the Group utilised A$500 million of its banking facilities ahead of payment of the final FY26 dividend, maintaining financial flexibility while retaining substantial cash on hand. The Company has US$600 million senior guaranteed notes (“Notes”). The Notes, due in April 2033, are guaranteed by certain wholly owned subsidiaries of Northern Star with interest payable semi-annually at a rate of 6.125% per annum. Hedging The Company continues to wind down its hedge commitments. During the quarter, 140koz of hedges were delivered at A$3,278/oz. Total hedging commitments as at 30 September comprised 647.5koz at an average price of A$3,423/oz. Table 4: Hedging commitments at 30 September 2026 H1 FY27 H2 FY27 H1 FY28 H2 FY28 Total Ounces (oz) 140,000 237,500 180,000 90,000 647,500 Gold Price (A$/oz) 3,307 3,340 3,532 3,603 3,423 Hemi Project Integration Engineering and design work on the Hemi Project is progressing with a Final Investment Decision remaining on track for late FY27. Northern Star provides the following update and financial information relating to the Hemi Project. Permitting: Activities in relation to permitting continued to progress as planned. Managed Aquifer Recharge trials commenced during the quarter, with results expected to support the Western Australian EPA secondary approval process, engineering design and project scheduling. Tax: Tax depreciation commenced from the Implementation Date, which means Northern Star expects to amortise approximately 50% of the tax depreciable value within five years. This corresponds to approximately A$300-350 million in cash tax savings for the Group in FY27 and A$200-250 million in FY28. Transaction Costs (Including Duty): The current estimate of the transaction costs (including landholder duty) associated with the acquisition of De Grey Mining Ltd is estimated to be in the range of A$200-250 million, subject to asset value classification and determination for landholder duty purposes. Profit and Loss Depreciation: Depreciation and amortisation will commence once commercial production at Hemi is achieved and ore extraction is underway. NST: September 2026 Quarterly Activities Report 8
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Corporate During the quarter, Northern Star appointed Jeff Quartermaine and Terry Bowen as independent Non-Executive Directors, effective 9 July and 1 September 2026 respectively, and announced the appointments of Mark Cutifani CBE and Peter Rozenauers as independent Non-Executive Directors, effective 1 October 2026. On 20 August, the Company released its FY26 Annual Reporting Suite, including the Annual Report, Environment & Social Responsibility Disclosures, Corporate Governance Statement and Modern Slavery Statement. Subsequent to quarter end on 6 October, the Company released its Notice of Annual General Meeting. The AGM will be held as a hybrid event at 1:30pm AWST on Wednesday, 18 November 2026. On 15 October, Northern Star paid its FY26 final dividend of A$0.30 per share. The issued capital of the Company at the date of this Report comprises: • Ordinary Fully Paid Shares (NST): 1,425,444,385 • Performance & Conditional Retention Rights (NSTAA): 8,732,379 • NED Share Rights (NSTAC): 8,488 This announcement is authorised for release to the ASX by the Board of Directors. Investor Relations: Sophie Spartalis Northern Star Resources Ltd T: +61 8 6489 2488 E: investorrelations@nsrltd.com Media Enquiries: Peter Klinger Purple T: +61 411 251 540 E: pklinger@purple.au Forward Looking Statements Northern Star Resources Ltd has prepared this announcement based on information available to it. No representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information, opinions and conclusions contained in this announcement. To the maximum extent permitted by law, none of Northern Star Resources Ltd, its directors, employees or agents, advisers, nor any other person accepts any liability, including, without limitation, any liability arising from fault or negligence on the part of any of them or any other person, for any loss arising from the use of this announcement or its contents or otherwise arising in connection with it. This announcement is not an offer, invitation, solicitation or other recommendation with respect to the subscription for, purchase or sale of any security, and neither this announcement nor anything in it shall form the basis of any contract or commitment whatsoever. This announcement may contain forward looking statements that are subject to risk factors associated with gold exploration, mining and production businesses. It is believed that the expectations reflected in these statements are reasonable but they may be affected by a variety of variables and changes in underlying assumptions which could cause actual results or trends to differ materially, including but not limited to price fluctuations, actual demand, currency fluctuations, drilling and production results, Resource or Reserve estimations, loss of market, industry competition, environmental risks, physical risks, legislative, fiscal and regulatory changes, economic and financial market conditions in various countries and regions, political risks, project delay or advancement, approvals and cost estimates. ASX Listing Rules Disclosures The information in this announcement that relates to the current Ore Reserves and Mineral Resources of Northern Star has been extracted from the ASX release by Northern Star entitled “Resources and Reserves Update” dated 3 June 2026 available at www.nsrltd.com and www.asx.com (“Northern Star Announcement”). Northern Star confirms that it is not aware of any new information or data that materially affects the information included in the Northern Star Announcement other than changes due to normal mining depletion during the seven month period to 20 October 2026, and, in relation to the estimates of Northern Star's Ore Reserves and Mineral Resources, that all material assumptions and technical parameters underpinning the estimates in the Northern Star Announcement continue to apply and have not materially changed. Northern Star confirms that the form and context in which the Competent Person's findings are presented have not been materially modified from that announcement. Currency Conversion Rate Unless stated otherwise, all currency conversions for the September quarter have been calculated using an AUD:USD exchange rate of 0.71. NST: September 2026 Quarterly Activities Report 9
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Appendix 1 Additional Information - Operations KCGM Operations Table 5: Summary Details - KCGM Operations Ore Mined - Underground Tonnes 818,559 794,024 818,415 739,019 739,019 Mined Grade g/t Au 1.7 1.7 1.7 1.7 1.7 Ounces Mined - Underground Oz 43,848 42,396 43,610 41,318 41,318 Open Pit Material Moved BCM 8,118,893 9,256,897 8,875,895 9,983,270 9,983,270 Ore Mined - Open Pit Tonnes 3,334,543 2,940,354 2,415,993 2,446,802 2,446,802 Mined Grade g/t Au 1.5 1.6 1.5 1.6 1.6 Ounces Mined - Open Pit Oz 163,284 153,364 119,590 124,533 124,533 Total Mined Ounces Oz 207,132 195,760 163,200 165,851 165,851 Milled Tonnes Tonnes 2,634,884 2,387,478 2,348,876 2,510,844 2,510,844 Head Grade g/t Au 1.6 2.0 2.2 1.7 1.7 Recovery % 82 83 82 76 76 Gold Recovered Oz 113,411 125,928 133,972 105,990 105,990 Gold Sold Oz 111,135 116,944 136,424 112,234 112,234 Cost per Ounce Underground Mining A$/oz 396 388 364 400 400 Open Pit Mining A$/oz 846 668 627 738 738 Stockpile Rehandle A$/oz — 6 2 8 8 Processing A$/oz 1,084 984 889 993 993 Site Services A$/oz 79 77 77 133 133 Ore Stock & GIC Movements A$/oz (634) (351) (290) (295) (295) Royalties A$/oz 198 233 201 175 175 By-Product Credits A$/oz (25) (58) (23) (36) (36) Cash Operating Costs A$/oz 1,944 1,947 1,847 2,116 2,116 Rehabilitation - Accretion & Amortisation A$/oz 38 35 30 38 38 Corporate Overheads A$/oz 110 102 93 121 121 Mine Development / Sustaining CAPEX A$/oz 511 401 441 452 452 All-in Sustaining Costs A$/oz 2,603 2,485 2,411 2,727 2,727 Exploration A$/oz 88 91 85 106 106 Growth Capital A$/oz 3,448 3,342 3,300 3,469 3,469 All-in Costs A$/oz 6,139 5,918 5,796 6,302 6,302 Depreciation & Amortisation A$/oz 1,528 1,366 1,214 1,345 1,345 Non-Cash Ore Stock & GIC Movements A$/oz (807) (453) (270) (344) (344) Production Summary Units Dec-25 Qtr Mar-26 Qtr Jun-26 Qtr Sep-26 Qtr FYTD NST: September 2026 Quarterly Activities Report 10
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Carosue Dam Operations Table 6: Summary Details - Carosue Dam Operations Production Summary Units Dec-25 Qtr Mar-26 Qtr Jun-26 Qtr Sep-26 Qtr FYTD Ore Mined - Underground Tonnes 597,400 557,632 526,133 440,446 440,446 Mined Grade g/t Au 2.6 2.5 2.4 2.3 2.3 Ounces Mined - Underground Oz 49,181 44,361 40,916 33,014 33,014 Open Pit Material Moved BCM 588,030 316,793 305,494 338,811 338,811 Ore Mined - Open Pit Tonnes 170,728 308,610 374,011 — — Mined Grade g/t Au 1.0 1.1 1.0 — — Ounces Mined - Open Pit Oz 5,278 10,669 12,576 — — Total Mined Ounces Oz 54,459 55,030 53,492 33,014 33,014 Milled Tonnes Tonnes 956,289 880,515 925,683 1,022,338 1,022,338 Head Grade g/t Au 2.1 2.0 1.8 1.5 1.5 Recovery % 91 90 90 90 90 Gold Recovered Oz 57,753 50,843 47,283 44,530 44,530 Gold Sold Oz 58,331 52,068 49,675 44,110 44,110 Cost per Ounce Underground Mining A$/oz 921 1,064 1,204 1,204 1,204 Open Pit Mining A$/oz 189 327 287 109 109 Processing A$/oz 424 497 619 582 582 Site Services A$/oz 117 119 144 172 172 Ore Stock & GIC Movements A$/oz 122 (142) (6) 365 365 Royalties A$/oz 254 319 345 305 305 By-Product Credits A$/oz (21) (27) (26) (24) (24) Cash Operating Costs A$/oz 2,006 2,157 2,567 2,713 2,713 Rehabilitation - Accretion & Amortisation A$/oz 17 18 19 34 34 Corporate Overheads A$/oz 109 99 96 123 123 Mine Development / Sustaining CAPEX A$/oz 513 439 400 548 548 All-in Sustaining Costs A$/oz 2,645 2,713 3,082 3,418 3,418 Exploration A$/oz 19 10 21 19 19 Growth Capital A$/oz 49 10 83 276 276 All-in Costs A$/oz 2,713 2,733 3,186 3,713 3,713 Depreciation & Amortisation A$/oz 921 1,362 1,386 994 994 Non-Cash Ore Stock & GIC Movements A$/oz 245 93 117 311 311 NST: September 2026 Quarterly Activities Report 11
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Kalgoorlie Operations Table 7: Summary Details - Kalgoorlie Operations Production Summary Units Dec-25 Qtr Mar-26 Qtr Jun-26 Qtr Sep-26 Qtr FYTD Ore Mined Tonnes 358,800 473,552 515,424 457,954 457,954 Mined Grade g/t Au 2.6 3.0 3.1 2.9 2.9 Ounces Mined Oz 30,136 45,713 50,637 42,391 42,391 Open Pit Material Moved BCM 569,438 522,286 358,016 502,127 502,127 Ore Mined - Open Pit Tonnes — — 145,966 63,189 63,189 Mined Grade g/t Au — — 1.3 1.3 1.3 Ounces Mined - Open Pit Oz — — 6,197 2,680 2,680 Total Mined Ounces Oz 30,136 45,713 56,834 45,071 45,071 Milled Tonnes Tonnes 402,543 484,363 471,401 544,683 544,683 Head Grade g/t Au 2.7 3.0 3.3 2.7 2.7 Recovery % 86 87 88 87 87 Gold Recovered Oz 29,869 41,167 43,368 41,578 41,578 Gold Sold Oz 34,013 41,301 41,631 37,196 37,196 Cost per Ounce Underground Mining A$/oz 1,246 1,210 1,408 1,433 1,433 Open Pit Mining A$/oz — — 46 35 35 Processing A$/oz 576 447 588 733 733 Site Services A$/oz 141 127 121 139 139 Ore Stock & GIC Movements A$/oz 338 110 (307) (187) (187) Royalties A$/oz 155 133 109 118 118 By-Product Credits A$/oz (22) (27) (21) (21) (21) Cash Operating Costs A$/oz 2,434 2,000 1,944 2,250 2,250 Rehabilitation - Accretion & Amortisation A$/oz 36 31 33 38 38 Corporate Overheads A$/oz 114 104 90 118 118 Mine Development / Sustaining CAPEX A$/oz 546 394 513 505 505 All-in Sustaining Costs A$/oz 3,130 2,529 2,580 2,911 2,911 Exploration A$/oz 230 188 230 190 190 Growth Capital A$/oz 438 374 242 138 138 All-in Costs A$/oz 3,798 3,091 3,052 3,239 3,239 Depreciation & Amortisation A$/oz 480 540 803 637 637 Non-Cash Ore Stock & GIC Movements A$/oz 88 43 (256) (56) (56) NST: September 2026 Quarterly Activities Report 12
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Jundee Operations Table 8: Summary Details - Jundee Operations Production Summary Units Dec-25 Qtr Mar-26 Qtr Jun-26 Qtr Sep-26 Qtr FYTD Ore Mined - Underground Tonnes 656,076 618,371 696,033 696,655 696,655 Mined Grade g/t Au 2.6 2.7 2.8 2.5 2.5 Ounces Mined - Underground Oz 55,186 52,976 61,724 56,961 56,961 Open Pit Material Moved BCM — — — — — Ore Mined - Open Pit Tonnes — — — — — Mined Grade g/t Au — — — — — Ounces Mined - Open Pit Oz — — — — — Total Mined Ounces Oz 55,186 52,976 61,724 56,961 56,961 Milled Tonnes Tonnes 603,751 742,111 791,599 763,016 763,016 Head Grade g/t Au 2.7 2.3 2.5 2.4 2.4 Recovery % 86 86 86 84 84 Gold Recovered Oz 44,163 47,658 55,799 48,223 48,223 Gold Sold Oz 44,464 45,807 56,792 48,998 48,998 Cost per Ounce Underground Mining A$/oz 1,856 1,995 1,665 1,498 1,498 Processing A$/oz 673 658 434 658 658 Site Services A$/oz 185 175 142 177 177 Ore Stock & GIC Movements A$/oz (299) (304) 160 207 207 Royalties A$/oz 212 237 223 181 181 By-Product Credits A$/oz (10) (17) (14) (11) (11) Cash Operating Costs A$/oz 2,617 2,744 2,610 2,710 2,710 Rehabilitation - Accretion & Amortisation A$/oz 34 33 26 29 29 Corporate Overheads A$/oz 105 111 93 119 119 Mine Development / Sustaining CAPEX A$/oz 696 619 559 812 812 All-in Sustaining Costs A$/oz 3,452 3,507 3,288 3,670 3,670 Exploration A$/oz 138 150 136 160 160 Growth Capital A$/oz 765 599 302 241 241 All-in Costs A$/oz 4,355 4,256 3,726 4,071 4,071 Depreciation & Amortisation A$/oz 574 879 832 877 877 Non-Cash Ore Stock & GIC Movements A$/oz (136) (172) (25) 7 7 NST: September 2026 Quarterly Activities Report 13
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Thunderbox & Bronzewing Operations Table 9: Summary Details - Thunderbox & Bronzewing Operations Production Summary Units Dec-25 Qtr Mar-26 Qtr Jun-26 Qtr Sep-26 Qtr FYTD Ore Mined - Underground Tonnes 651,535 739,317 760,156 656,497 656,497 Mined Grade g/t Au 1.7 1.8 1.8 1.8 1.8 Ounces Mined - Underground Oz 35,437 43,125 43,361 37,175 37,175 Open Pit Material Moved BCM 4,355,766 3,471,326 3,397,120 3,398,242 3,398,242 Ore Mined - Open Pit Tonnes 1,057,637 1,175,845 1,255,686 1,423,213 1,423,213 Mined Grade g/t Au 0.9 1.0 1.1 1.2 1.2 Ounces Mined - Open Pit Oz 29,892 39,034 46,148 54,438 54,438 Total Mined Ounces Oz 65,329 82,159 89,509 91,613 91,613 Milled Tonnes Tonnes 1,470,273 1,430,862 1,621,222 1,447,387 1,447,387 Head Grade g/t Au 1.2 1.4 1.5 1.6 1.6 Recovery % 84 90 90 87 87 Gold Recovered Oz 47,547 56,191 71,706 64,521 64,521 Gold Sold Oz 47,023 59,115 67,145 68,633 68,633 Cost per Ounce Underground Mining A$/oz 1,186 975 925 962 962 Open Pit Mining A$/oz 795 685 850 802 802 Processing A$/oz 889 738 778 651 651 Site Services A$/oz 173 160 148 164 164 Ore Stock & GIC Movements A$/oz (429) (134) (337) (115) (115) Royalties A$/oz 243 291 260 266 266 By-Product Credits A$/oz (17) (24) (28) (22) (22) Cash Operating Cost A$/oz 2,840 2,691 2,596 2,708 2,708 Rehabilitation - Accretion & Amortisation A$/oz 38 30 28 58 58 Corporate Overheads A$/oz 111 103 95 123 123 Mine Development / Sustaining CAPEX A$/oz 578 398 457 808 808 All-in Sustaining Costs A$/oz 3,567 3,222 3,176 3,697 3,697 Exploration A$/oz 37 48 77 53 53 Growth Capital A$/oz 1,277 999 884 143 143 All-in Costs A$/oz 4,881 4,269 4,137 3,893 3,893 Depreciation & Amortisation A$/oz 1,651 1,163 1,252 1,344 1,344 Non-Cash Ore Stock & GIC Movements A$/oz (309) 159 372 (173) (173) NST: September 2026 Quarterly Activities Report 14
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Pogo Operations Table 10: Summary Details - Pogo Operations (US$)(1) Production Summary Units Dec-25 Qtr Mar-26 Qtr Jun-26 Qtr Sep-26 Qtr FYTD Ore Mined Tonnes 345,541 347,552 375,804 297,047 297,047 Mined Grade g/t Au 5.5 6.9 7.8 5.9 5.9 Ounces Mined Oz 61,252 77,423 94,245 56,356 56,356 Milled Tonnes Tonnes 347,710 340,844 381,693 294,700 294,700 Head Grade g/t Au 5.5 6.9 7.8 5.9 5.9 Recovery % 86 87 88 88 88 Gold Recovered Oz 52,832 65,662 84,059 49,316 49,316 Gold Sold Oz 53,095 65,573 81,815 52,720 52,720 Cost per Ounce Mining US$/oz 991 827 701 1,081 1,081 Processing US$/oz 456 416 342 542 542 Site Services US$/oz 158 151 119 217 217 Ore Stock & GIC Movements US$/oz (15) (8) 19 (11) (11) By-Product Credits US$/oz (7) (10) (6) (8) (8) Cash Operating Costs US$/oz 1,583 1,376 1,175 1,821 1,821 Rehabilitation - Accretion & Amortisation US$/oz 9 8 6 10 10 Corporate Overheads(2) US$/oz 45 38 32 56 56 Mine Development / Sustaining CAPEX US$/oz 234 107 171 420 420 All-in Sustaining Costs US$/oz 1,871 1,529 1,384 2,307 2,307 Exploration US$/oz 126 125 134 212 212 Growth Capital US$/oz 295 194 228 446 446 All-in Costs US$/oz 2,292 1,848 1,746 2,965 2,965 Depreciation & Amortisation US$/oz 422 411 401 367 367 Non-Cash Ore Stock & GIC Movements US$/oz 4 (12) — 27 27 (1) Pogo Operations costs are presented in USD which is the functional currency of the operation. The figures are presented in AUD in Table 1 above, which is the Group's presentational currency. The September quarter AUD:USD exchange rate is 0.71 and FYTD AUD:USD exchange rate is 0.71 respectively. (2) Corporate costs are allocated to Pogo based on services provided. The remaining amount is allocated to the Australian Operations based on gold sold (production ounces). NST: September 2026 Quarterly Activities Report 15