铁矿石跌至两个月低点，西芒杜供应激增冲击必和必拓、力拓和FMG

KEY POINTS

Iron ore fell to a two-month low as Guinea’s huge Simandou mine ramps up shipments, and more supply means lower prices.

That dragged down Australia’s big miners: Fortescue (ASX: FMG) fell 4.1%, while BHP (ASX: BHP) and Rio Tinto (ASX: RIO) each lost 3.3%.

Simandou is still ramping up and aims to produce far more by around 2028, so this supply pressure could last for years.

The miners are still highly profitable at these prices, so the risk is lower profits ahead, not the companies getting into trouble.

Australia’s biggest miners were among the ASX’s worst performers on Thursday as fears of oversupply swept through the iron ore market. The S&P/ASX 200 fell 1.13% to 8,686, with the materials sector leading the decline, down 3.2%. Iron ore producers bore the brunt of the selling after fresh data showed exports from Guinea’s long-awaited Simandou project accelerating faster than expected. For years, Simandou has been seen as the biggest potential disruption to the global iron ore market, and now that disruption appears to be arriving.

Simandou is one of the world’s largest undeveloped high-grade iron ore deposits. It has been talked about for decades, but production is now ramping up, and exports are flowing into global markets.

Iron ore prices are driven by supply and demand. Investors have spent years watching Chinese steel demand, but the market must now focus on the other side: rising supply. Exports from Simandou reached 2.2 million tonnes in May, smashing April’s record of 1.3 million tonnes and far above first-quarter volumes. The reaction was immediate, with iron ore futures falling 1.9% to US$101.65 per tonne, their lowest level in two months.

The concern is not the May figure itself, but what it signals about future supply. These shipments are only the ramp-up phase. Simandou’s two operators are targeting a combined 120 million tonnes a year, one of the largest new sources of seaborne supply in decades, once the 650km trans-Guinean railway and deep-water port reach full capacity around 2028. If exports keep climbing towards that goal, the extra tonnes could weigh on prices for years.

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Iron ore is the earnings engine for Australia’s largest miners, so even modest price falls hit sentiment hard. Fortescue (ASX:FMG) fell 4.1%, the worst of the majors, because it is the most heavily leveraged to iron ore and has fewer alternative earnings streams to soften the blow.

BHP (ASX:BHP) and Rio Tinto (ASX:RIO) each dropped 3.3%, while Mineral Resources (ASX:MIN) lost 2.3%. Rio faces an awkward dynamic as a major Simandou stakeholder: the project should eventually boost its production, but the extra supply is also pressuring the iron ore price that drives much of its profit today. Both BHP and Rio had also recently traded near record highs, giving investors reason to lock in gains at the first sign of trouble.

The answer hinges on whether Simandou’s export growth proves temporary or structural. If the recent jump is a short-term ramp-up that settles over the coming months, the selloff may prove excessive, and quality miners could look attractive after the pullback. But if production climbs as planned, investors may have to accept a major shift. For much of the past decade, iron ore prices have moved with China’s steel appetite, and Simandou now adds a powerful new supply source that can pressure prices regardless of what China does.

Reassuringly, BHP, Rio and Fortescue stay highly profitable even with iron ore around US$100 per tonne, so none face financial stress. The real risk is that earnings forecasts and valuations may need to reset if prices stay weak for long.

Simandou is moving from future threat to present reality, and supply has become the key story in iron ore. If exports keep climbing, BHP, Rio and Fortescue could face ongoing pressure even if demand holds steady. Investors looking to buy the dip should keep one eye on iron ore prices and the other firmly fixed on Guinea.

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