Rio Tinto’s $473 Million South African Bet and a Rare Diamond Discovery

Rio Tinto navigates cyclone disruptions, copper gains, a diamond mine closure, and a $473M titanium bet while facing new China pricing pressures.

The mining giant Rio Tinto is riding a wave of investor enthusiasm, with its shares up roughly 51 percent since the start of the year to close at €104.58 on Friday — just a whisper below a 52-week high. But beneath the surface of this rally, the company is juggling a complex mix of operational triumphs, strategic pivots, and fresh geopolitical pressures.

Cyclones and a Record Quarter

Tropical cyclones Mitchell and Narelle hammered Western Australia’s Pilbara region in March, costing Rio Tinto roughly eight million tonnes in lost iron ore shipments. The company also pledged financial support for local recovery efforts. Yet the damage was contained. Iron ore extraction in the region actually jumped 13 percent to nearly 79 million tonnes, marking the second-strongest first-quarter performance for the division in eight years. Management has held firm on its full-year production target of 323 million to 338 million tonnes from Pilbara.

Copper Gains and a Diamond Farewell

Beyond iron ore, Rio Tinto’s copper production rose 9 percent, driven by the ramp-up of the underground Oyu Tolgoi mine in Mongolia and efficiency programs that have slashed annual costs by a three-digit million-dollar amount.

A historic chapter closed at the Diavik diamond mine in Canada, which ended production in late March after 23 years of operation. In its final weeks, miners unearthed a yellow rough diamond weighing over 158 carats. The company plans to sell the remaining stones through its international network over the course of the year.

A $473 Million Bet on Titanium and Zircon

Away from its core commodities, Rio Tinto is pushing deeper into titanium and zircon. The company is investing $473 million to revive the Zulti South project in South Africa’s KwaZulu-Natal province. Regional unrest had halted the project in 2020, but construction resumed in March 2026. First commercial production is slated for the fourth quarter of 2028. Once operational, the facility is expected to churn out 660,000 tonnes of concentrate annually, extending the life of the Richards Bay mines beyond 2050.

New Rules in China

The competitive landscape in iron ore is shifting. Rival BHP has struck a deal with China Mineral Resources Group on a new pricing formula for certain ore grades, based on a weighted average of four indexes. The Chinese COREX index will carry a 26 percent weight in the calculation. Analysts see this as a clear signal that Rio Tinto will face pressure to adopt similar mechanisms and give greater weight to Chinese market data. China remains the linchpin for the company’s valuation, with benchmark iron ore prices in Singapore hovering near $107 per tonne.

Political Talks in Australia

Attention this week turns to the Tomago aluminium smelter in New South Wales. The state government is negotiating with Canberra over a 50-50 cost-sharing arrangement to secure the facility’s future. A deal could unlock $7.5 billion in grid investments. Rio Tinto already struck a similar agreement for the Boyne smelter in December.

Market Momentum

The stock’s rally has been remarkable. After a geopolitical setback in March, shares recovered sharply and now trade just a hair below their 52-week peak. The distance to the 200-day moving line — nearly 54 percent — underscores the sheer force of the upward move. The market appears to be pricing in both strong fundamentals in copper and iron ore and a geopolitical risk premium.