The world’s 50 most valuable mining companies saw their combined market capitalisation fall by $264 billion in September, the second-largest monthly decline in the history of the ranking. The drop reversed more than three-quarters of August’s record $357 billion gain, driven by the same metal that fuelled the advance: gold.
Bullion futures in New York slid from $4,441 per troy ounce at end-August to $4,158 by the close of September, a 6.4% decline that pushed gold below its level at the start of the year. The reversal coincided with a Federal Reserve rate hike on 16 September – the first since 2023 – a global bond selloff that pushed yields to their highest since 2008, and a stronger US dollar. All three factors weigh on gold, which generates returns solely through price appreciation.
Gold miners bear the brunt
Gold mining stocks that had added $138 billion in August gave back $79 billion in September, a 12.7% sector decline. Of the fifteen gold companies in the ranking, none ended the month higher. Newmont and Agnico Eagle both suffered double-digit billion-dollar losses. Agnico Eagle, which had crossed the $100 billion market capitalisation threshold in August, slipped back below it.
AngloGold Ashanti, the sector leader during August’s rally, fell 16.4% and lost $9.4 billion. Kinross dropped 21.3% after cutting its 2026 and 2027 production guidance by about 8% from the midpoint, citing winter storms at its La Coipa mine in Chile and lower grades at Round Mountain in Nevada; its shares fell more than 10% in a single session. The sharpest decline in the entire ranking belonged to Shandong Gold, which fell 27.8% after its board reduced the group’s 2026 mined gold target to between 1.16 million and 1.22 million ounces from a previous plan of at least 1.58 million ounces. Zhongjin Gold, its Beijing-based peer, lost 17.7%.
Gold Fields lost $8.6 billion in market value during the month, falling 21%, after its unsolicited A$38.7 billion (about $27 billion) bid for Northern Star was rejected on 28 September as “highly opportunistic” by the Australian company’s board. Gold Fields is said to be weighing a larger cash component to revive the proposal. Northern Star, the target, was the best-performing gold miner in the ranking, falling only 3.1% as the bid premium cushioned it against the metal’s decline.
Copper and iron ore: record price but mixed fortunes
Copper producers lost $44 billion collectively, a 7.6% fall that appeared orderly beside gold’s 12.7% rout. The copper price ended September at $6.56 per pound ($14,500 per tonne), almost exactly where it started the month. In between, it set a fresh all-time high after a stalled US tariff proposal drained inventories from London and Shanghai warehouses, but gave back the gains when the White House hesitated.
Southern Copper fell 3.0% to $171 billion, ending the quarter in second place in the ranking for the first time. The Mexican-Peruvian miner had briefly overtaken Rio Tinto in August but ended September $9.9 billion behind it, with Rio down 8.9% and $15.8 billion lighter as iron ore remained stuck below $100 per tonne. Teck Resources fell 3.4% as it awaits final regulatory decisions in China and South Korea regarding its proposed merger with Anglo American’s copper business.
The largest dollar loss anywhere in the ranking – $26.4 billion, or 11% – was suffered by BHP after a worker was killed at its Escondida mine on 23 September, the world’s largest copper operation, prompting a suspension of operations. Supervisors also voted for strike action that same week. Freeport-McMoRan fell 7.6% to $100.5 billion, clinging to its place in the $100 billion club by a narrow margin. The club, which had seven members at end-August, counted six at end-September.
Lithium and silver: a sharper retreat
Silver, which tends to amplify gold’s moves, fell 9% in September. Platinum group metals continued to slide deeper into negative territory. Lithium, which had appeared to be gaining momentum earlier in the year, lost more than a fifth of its value in September alone and now shows only a small gain for 2026. Only one lithium producer remains in the top 50 ranking, a stark contrast to earlier in the year when several had entered the list.
Key takeaways
- The top 50 mining stocks lost $264 billion in September, the second-worst month in the ranking’s history.
- Gold’s 6.4% decline and a 12.7% drop in gold mining stocks drove the majority of losses.
- Copper hit a record price intra-month but closed flat; copper miners fell 7.6% overall.
- BHP suffered the largest single-company loss ($26.4 billion) after a fatal accident at Escondida.
Common questions
Why did gold prices fall in September?
The Federal Reserve raised interest rates for the first time since 2023, a global bond selloff pushed yields to multi-year highs, and the dollar strengthened. All of these factors are negative for gold because the metal does not pay income and competes with yield-bearing assets.
Which miners were hardest hit?
Shandong Gold fell 27.8% after cutting its production target. Gold Fields lost 21% after its bid for Northern Star was rejected. BHP recorded the largest dollar loss ($26.4 billion) after a fatal accident at its Escondida copper mine.
How did the lithium sector perform?
Lithium prices lost more than 20% of their value in September, wiping out most of 2026’s gains. Only one lithium producer remains in the top 50 mining companies ranking.
The September selloff erased a significant portion of the gains miners had built in August, and the outlook for the sector remains tied to central bank policy, metal demand in China and the trajectory of the US dollar. For investors tracking the broader market, the live gold price provides a real-time gauge of sentiment across the precious metals complex.