Forget the price chart, the real threat to Australian mine margins is hiding in the sulphur bill, the freight invoice and the silica assay

S&P Global’s June quarter market review shows the pressure on Australian operations shifting from what miners sell to what they spend. For site teams, the levers they control are becoming the ones that decide performance.

For most of the past decade, the first question on an Australian mine site when markets turned was a simple one: where is the price going? S&P Global Market Intelligence’s State of the Market review of the June quarter, presented on 9 September, suggests that question is no longer enough.

The headline numbers are mixed rather than bleak. Copper averaged US$13,408/t on the London Metal Exchange (LME) in the June quarter, up 4% on the March quarter. Zinc rose 6%. S&P expects gold to average around US$4,400/oz for 2026. But iron ore, Australia’s largest export, has held below US$100/dmt since mid-June, and the forces squeezing margins across commodities are increasingly arriving through inputs rather than outputs.

Pranay Shukla, who leads S&P’s new Metals Trading Research team from Singapore, summed up the quarter in one line: “Geopolitical shocks are now physical market shocks.”

When a strait becomes a site cost

The US-Iran standoff, now in its seventh month, has cut transits through the Strait of Hormuz by more than 70%, according to Pranay, and the cost of moving cargo has followed.

“Before the disruption happened, the insurance for a vessel was less than half a percent,” he said. “Now we are getting even 7 to 8%. That’s a big value.”

That matters on an Australian mine site even when no ore passes near the Gulf.

“If the oil moves materially higher, the impact shows up in mining,” Pranay said. “It shows up in smelting. It shows up in refining, freight, power, before it reaches the end-use demand.”

The sector, he said, faces two risks at once. The first is a higher operating cost base. The second is a less supportive financial backdrop if inflation keeps interest rates, the US dollar and real yields firm.

S&P’s economics team has revised its 2026 global growth forecast down from 2.9% to 2.4% since February, and its global inflation forecast up from 2.9% to 3.8%.

Sulphur is the clearest example of a reagent shock. On S&P data, Middle East spot sulphur prices have roughly tripled since mid-2025. Sulphur is the feedstock for sulphuric acid, and Joenelle Donato, an analyst in S&P’s non-ferrous markets team, traced the impact through high pressure acid leach (HPAL) nickel operations in Indonesia. “As sulphur prices have remained elevated, processing costs have increased across the value chain,” she said. Indonesian mixed hydroxide precipitate (MHP) exports fell around 20% year on year in the first half.

For any Australian operation that consumes acid, diesel, explosives or imported consumables, the lesson is the same. Reagent and logistics exposure has become a strategic question, not a line item to be managed at contract renewal.

Capital gets harder to win

The second pressure arrives through the balance sheet. Long-dated sovereign bond yields have trended upward across major economies, Australia included, since late February.

Pranay said higher yields raise discount rates and make capital-intensive mining projects harder to sanction, especially when operating costs are already rising. “The sector implication is straightforward,” he said. “The project needs stronger price assumptions, a cleaner execution, or shorter payback to compete for capital.”

The funding data supports that view. Mining companies raised US$13.64 billion in the June quarter, down 5% on the previous quarter. Major producers lifted their raisings 5% to US$5.73 billion, but junior miners raised US$6.15 billion, down 13%. S&P’s Pipeline Activity Index, which tracks drill results, resource announcements, financings and project milestones, fell 13% for gold and 18% for base and other metals over the quarter.

For drilling contractors and exploration service providers, that is an early signal worth reading carefully heading into the second half.

The permitting clock

Louanne De Sales, an analyst in S&P’s mine economics and emissions team, presented the 2026 update of the company’s discovery to production study, which covers 203 operating mines. The average lead time from discovery to first production has lengthened to around 16 years. For mines scheduled to start from 2026, S&P estimates the full timeline at 29.3 years.

Most of the growth sits after the feasibility study. For mines that started between 2020 and 2025, the wait between feasibility and construction averaged 2.2 years. For projects coming online from 2026, S&P projects 7.4 years, driven predominantly by permitting and regulatory hurdles.

Australia sits well inside the global pack. Its average lead time of 13.3 years compares with a global average of 15.9 years, and only Chile and the Democratic Republic of the Congo are faster among the 16 countries in the study with at least five mines. Canada and the US sit at 20.4 years each. S&P lists Australia’s 2025 EPBC Act reform among the government measures aimed at the bottleneck.

The practical implication cuts two ways. New supply everywhere is slow, which supports long-term prices for metals heading into structural deficit. On copper, Joenelle was blunt: “The copper industry continues to face significant challenges in bringing sufficient new supply to meet future demand.” It also means existing Australian operations, and the brownfield expansions attached to them, carry more strategic value than they did a decade ago.

Katherine Matthews, principal analyst in S&P’s mine economics and emissions team, pointed to a related shift in battery metals. Resource-rich countries are using export restrictions and ownership requirements to hold on to value, while the US and EU are restricting black mass exports to secure recycling feedstock. “The industry’s long-term challenge may be more about access to supply than supply availability,” she said. For a jurisdiction that can permit and deliver, that is a structural advantage.

Iron ore and the price of impurities

Iron ore shows the shift most clearly. The Platts IODEX averaged US$105.29/dmt in the June quarter, up 1.3%, helped by higher freight costs from the Middle East conflict. Since then, the picture has deteriorated. “I’m afraid to say the story has soured,” Katherine said. She said the IODEX has been range-bound near US$95/dmt on rising inventories and ample medium-grade fines. S&P has revised its 2026 forecast to US$100/dmt and expects seaborne oversupply to widen through to 2030. In S&P’s August China iron ore and steel sentiment tracker, 81% of participants expected prices to stay below US$100/dmt, up from 64% in July.

Buyer leverage has sharpened. China Mineral Resources Group (CMRG) advised Chinese mills against procuring BHP Newman fines from March before lifting those curbs, and has since imposed delivery restrictions on Fortescue’s Super Special Fines. BHP’s unionised workers at Port Hedland have taken strike action twice in as many months.

Against that backdrop, quality is being priced more precisely. Platts moved the IODEX benchmark from 62% to 61% Fe on 2 January. The reference specification now allows 2.5% alumina (from 1.7%), 4.5% silica (from 3.5%) and 0.1% phosphorus (from 0.09%). S&P has added a value-in-use adjustment to its iron ore cost curve that applies impurity premiums and discounts at the individual asset level.

“While on the surface this small percentage may seem immaterial, their presence can have significant impacts on the quality of finished products,” Louanne said. Higher silica and alumina increase slag volume and viscosity at the blast furnace and raise coke and flux requirements. With coking coal availability in China expected to stay tight for the rest of 2026, those penalties bite harder at the mill, and ultimately at the mine gate.

At the same time, lump premiums have climbed to a more than four-year high on sintering restrictions and tight domestic concentrate supply in China. For Pilbara operations, grade control, blending and lump yield are now as much commercial levers as metallurgical ones.

By-products, restarts and a nickel caution

Louanne’s zinc analysis carried a similar message about value hiding in the ore. Zinc’s share of revenue at zinc mines has fallen from 64% in 2022 to about 55% this year. “Not because zinc has become less profitable, but because by-products have become increasingly important,” Louanne said. Silver, gold, lead and copper credits have all grown in weight. On S&P’s cost curve, the same volume of paid zinc sat 26 US cents/lb lower in 2025 than in 2020 as precious metal prices rose. Mount Isa was among the polymetallic operations cited. Her conclusion was that value creation “extends well beyond the primary commodity”, and recovery performance on secondary metals is now moving cost positions materially.

In lithium, S&P’s trading research team pointed to Australian mine restarts as a key reason spodumene conversion spreads have narrowed. How well those restarts perform will shape the market as much as demand does.

Nickel carried a caution for anyone reading Indonesian policy as a signal for WA. Indonesia’s approved 2026 ore quota is 30.1% below 2025, but Pranay noted the LME market remains largely in contango, meaning nearby metal is not being bid up as it would be in a genuine shortage. “Until the inventories fall and contango turns, nickel looks like a policy risk premium and not a confirmed shortage,” he said.

Gold remains the sector’s strongest balance sheet story, and consolidation is following. Genesis Minerals signed a binding scheme implementation deed with Vault Minerals on 14 July after outbidding Regis Resources. Louanne said either bid would rank as the third-largest mining deal announced in Australia since 2021. For site teams, the next phase of that story is integration: fleets, processing hubs, contractors and systems across merged portfolios.

What to watch from site

Pranay reduced S&P’s macro watch list to five signals for the metals sector. They are shipping and trade flows; end-use demand; purchasing manager and order book data; interest rates, the US dollar and real yields; and exchange inventories, spreads and regional premiums. The last of these, he argued, tells you whether tightness is real, regional or just a headline.

Copper made the point during the quarter. LME backwardation deepened sharply as deliverable stocks tightened, while COMEX inventories in the US stayed elevated ahead of a tariff decision. “That market was paying not just for copper, but for copper in the right location,” Pranay said.

His broader conclusion applies well beyond the trading desk. “Location, inventory visibility, route operationality and deliverability now matter as much as the headline supply-demand balance,” he said.

Translated to an Australian operation, the equivalent list sits closer to home. It covers delivered cost and security of supply for reagents, fuel and critical spares; freight and insurance terms on inbound and outbound cargo; product specifications against buyer penalties; recovery of secondary metals; and the hurdle rate head office is now applying to sustaining and expansion capital.

Commodity prices will keep moving, and some are strong. But the June quarter data points to a period in which operations are separated less by what the market pays them and more by what they spend, what they recover and what they can reliably deliver. That is territory site teams control.

All figures are attributed to S&P Global Market Intelligence and S&P Global Energy as presented at the State of the Market webinar on Wednesday 9 September 2026, with underlying data current to dates between late July and 4 September 2026.