Is the Copper Squeeze Over? The Smelters Say No.
Copper fell 6% from its record and the futures curve flipped to contango — but the benchmark fee for smelting copper just reset to zero. What the concentrate market knows that the warehouse data doesn't.
On September 10, copper did something it had never done: it traded at $14,875 per tonne on the London Metal Exchange, an all-time record. Five days later it had given back 6%, touching $13,958 — a three-week low — before stabilizing just above $14,000.
The unwind came with a full set of bearish furniture. LME warehouse stocks jumped 3.6% in a single session to 242,900 tonnes. The futures curve, which had spent August in backwardation — spot trading above the three-month forward, the classic scarcity signal — flipped into a $67.50 contango. And Reuters reported that the White House is hesitating on refined copper tariffs, removing the urgency that had Chinese buyers front-loading purchases all summer. Add a Federal Reserve that just delivered the first rate hike of the war economy and a dollar at two-week highs, and the surface read is simple: the squeeze is over.
But the most important price in the copper market right now isn't the price of copper. It's the fee smelters charge to turn mined concentrate into refined metal — and that fee just reset to zero.
What Actually Broke Last Week
Be precise about what the pullback was. The rally into the September 10 record had two engines: a genuine supply deficit, and a tariff-driven scramble to move metal ahead of a possible U.S. duty on refined copper. The Reuters report on September 11 switched off the second engine. Copper fell to roughly $14,330 the same day and kept sliding as the front-running trade unwound.
The warehouse build and the contango flip are real signals — they say near-term physical tightness has loosened. Metal is available on short notice in a way it wasn't in August. Traders who were reading the LME backwardation as a bullish tell were right to take note when it disappeared.
What the unwind did not touch is the upstream story. Chinese physical buyers told you as much: the Yangshan import premium — the key gauge of China's appetite for foreign copper — bounced back to $100 per tonne within days of the selloff, its highest level since mid-August. The dip found buyers immediately.
The Mines Can't Answer
Global mine supply is now expected to post its first annual decline since 2017. That is not a forecast artifact; it is a casualty list.
Grasberg — the world's second-largest copper mine — remains crippled a year after an estimated 800,000 tonnes of mud flooded its Block Cave section, which carried roughly 70% of the mine's planned output. Freeport's lost production through December 2026 is expected to exceed the entire annual output of Collahuasi, one of the largest mines on Earth. Kamoa-Kakula in the DRC lost roughly 300,000 tonnes to flooding. Cobre Panama remains shut, holding more than 300,000 tonnes off the market. Teck cut guidance by about 60,000 tonnes across its operations; Codelco's El Teniente lost 33,000 tonnes after a fatal accident and tightened regulatory oversight.
Historically, unplanned outages run about 5% of global supply, and the system absorbs them. This year there is no slack to absorb anything — which is why the concentrate market is screaming. The annual treatment-charge benchmark, the fee that anchors smelter contracts and historically sat in the $80s per tonne, reset to $0 for 2026, down from $21.25 last year. Spot treatment charges have gone further — negative, at fresh all-time lows. Smelters are effectively paying for the privilege of feedstock. That does not happen in a market heading for surplus.
So the question that matters for the next quarter: was last week the end of the squeeze — or the reload? The answer comes down to a handful of numbers, and they don't all point the same way.
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The rest of this briefing is for paid members: the deficit forecast spread — J.P. Morgan's 330,000-tonne shortfall versus Goldman's contrarian surplus — and which side the concentrate market backs, the January 1, 2027 tariff date the market has stopped pricing, three Q4 scenarios with price zones and the signals that confirm each, and the metal-versus-miners positioning framework.
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