Northern Star Resources Limited

The Business

Northern Star is Australia's largest gold miner by production, pouring roughly 1,630 thousand ounces in FY25 across three production centres: Kalgoorlie in Western Australia (54% of revenue), Yandal in Western Australia (24%), and Pogo in Alaska (22%). The company operates its own mines and processing infrastructure, which distinguishes it from the joint-venture or royalty models used by some peers. Its flagship asset, KCGM (the "Super Pit" in Kalgoorlie), is one of Australia's oldest and largest gold operations with over a century of continuous mining. A mill expansion currently doubling KCGM's processing capacity from 13 to 27 million tonnes per annum is more than 90% complete.

Recent Performance

NST shares have roughly doubled over the past 12 months, driven almost entirely by the gold price surge. FY25 revenue rose 30% to A$6,415 million off an FY24 base that itself grew modestly, with gold's move from A$3,031 to A$3,922 per ounce explaining the bulk of the increase. Production was flat at 1,630 thousand ounces. EBITDA expanded to A$3,502 million at a 55% margin. Free cash flow was negligible after A$2.3 billion in growth capital spending on the KCGM expansion, and management cut FY26 production guidance three times during the year.

Outlook

The next 12 months are defined by the KCGM mill commissioning in mid-2026, which should lift group production from approximately 1,500 thousand ounces toward 1,700-plus thousand ounces by FY27 and ultimately 1,860 thousand ounces by FY29. More importantly, capital expenditure drops from roughly A$2.6 billion in FY26 to A$1.3 billion by FY28, swinging free cash flow from negative to an estimated A$1.6 billion. EBITDA margins compress from 54% to around 49% in our base case as gold mean-reverts, but the FCF transformation is structural regardless of gold's direction. A legacy hedge book covering 953 thousand ounces at A$3,362 per ounce creates a A$760 million revenue headwind through June 2028.

Key Risks

Gold price reversion is the dominant risk: a move back to A$3,200 per ounce would compress EBITDA by roughly 40%. KCGM ramp execution remains uncertain after three guidance cuts in FY26. The Hemi development project (8 million ounces, pre-feasibility) carries permitting risk that could trigger a material write-down if regulatory approval is denied.

What to Watch

The thesis-defining event is the KCGM mill commissioning in July to September 2026, which will confirm whether the capacity doubling translates into the production uplift underpinning the forward earnings trajectory.

• Jul-Sep 2026 KCGM mill commissioning — Successful ramp to 22-plus million tonnes per annum validates the FCF inflection thesis.
• Aug 2026 FY26 full-year results — First comprehensive look at the capital expenditure wind-down and FCF trajectory under expanded capacity.
• FY27-FY28 Hemi final investment decision — A go-ahead on this 8 million ounce resource adds meaningful optionality; delay or cancellation removes a key growth lever.

Company Description

Northern Star operates three production centres across two of the world's most established mining jurisdictions. Kalgoorlie, anchored by the KCGM Super Pit and surrounding underground mines, is the largest centre and generates roughly A$3,490 million in annual revenue. Yandal, a hub of underground operations in the northern Goldfields, contributes approximately A$1,530 million. Pogo, a high-grade underground mine in Alaska's interior, adds A$1,395 million and provides geographic diversification along with natural USD revenue exposure. All three centres are owner-operated with captive processing facilities, giving the company direct control over its cost structure. The combined reserve base exceeds 20 million ounces, with an additional 8 million ounces in resources at the pre-development Hemi project in the Pilbara region of Western Australia.

Where the Growth Is

The KCGM expansion is the single most consequential growth driver. The mill upgrade from 13 to 27 million tonnes per annum is designed to lift Kalgoorlie's production from roughly 600 thousand ounces to 855 thousand ounces per annum by FY29, an increase of approximately 300 thousand ounces representing a 40% uplift in group output. The expansion also lowers all-in sustaining costs by an estimated A$200-400 per ounce through processing scale. Beyond production, the transformation is financial: capital expenditure falls from roughly A$2.6 billion at peak construction to A$1.3 billion by FY28, converting a cash-consuming business into one generating over A$1.6 billion in free cash flow annually.

Competitive Position

NST's competitive advantages are real but narrow, and they require continuous execution to sustain. The KCGM deposit itself is the company's most durable asset: 100-plus years of geological data, established infrastructure, proximity to Kalgoorlie's skilled labour pool, and a remaining mine life exceeding a decade. Post-expansion, KCGM's processing scale should place the operation in the lowest-cost quartile of Australian gold producers. The company's exploration capability is genuinely distinctive, with a discovery cost of A$19 per ounce against an industry average several multiples higher. This translates into reserve replacement without relying on acquisitions.

However, NST remains a commodity price-taker. No brand, switching cost, or network effect protects revenues. The competitive advantage is surviving downturns better than peers through cost position and balance sheet strength, not avoiding them. These advantages are durable for roughly seven years before reserve depletion and cost inflation begin to erode them absent continued exploration success.

Management & Capital Discipline

CEO Stuart Tonkin has led Northern Star for a decade, delivering two transformative transactions: the 2021 Saracen merger that created the current company and the 2025 De Grey acquisition that secured the Hemi resource. Both were executed at valuations that appear reasonable relative to acquired ounces. The company maintains a conservative balance sheet and has initiated a A$500 million buyback. Dividends remain modest at a 25% payout ratio, reflecting ongoing capital requirements.

Management emphasised "cash earnings" in FY25 communications while underlying free cash flow was negative, a framing choice that required investors to look beyond the headline to the actual cash flow statement. Three production guidance downgrades during FY26, attributed to workforce productivity and crusher issues, suggest operational execution does not match the quality of strategic decision-making. We have applied a 5% haircut to management's steady-state production targets throughout our forecasts.

Financial Position

The balance sheet is a clear strength. Northern Star carries a net cash position with A$2.7 billion in available liquidity, including A$865 million in cash and A$311 million in gold bullion. Gross debt of approximately A$1.4 billion (primarily US dollar-denominated notes) is comfortably covered by earnings, with net debt to EBITDA effectively at zero. The company has no covenant risk under any realistic gold price scenario. Rehabilitation provisions of A$823 million for mine closure obligations are the most material off-balance-sheet consideration. Even at A$3,200 per ounce gold, the company would remain cash flow positive after sustaining capital expenditure.