Freeport-McMoRan (NYSE: FCX) lost close to $9 billion of market value on Thursday over a decision Washington did not make. The refined-copper tariff still under review would be worth roughly $1.4 billion a year in additional gross revenue to the company at Thursday's prices, before tax, by our arithmetic. One session erased more than six years' worth of that.
That mismatch is the story. Nothing changed in Freeport's mines, its costs or its order book. What changed was the market's estimate of a probability.
The report that moved it
Reuters reported on Sept. 10 that the White House has not yet decided whether to tax imports of refined copper. Officials are split, according to the report. One camp wants to revive domestic mining. The other worries about what dearer metal does to manufacturing costs ahead of the November midterm elections.
A White House official told Reuters that "the administration continues to evaluate all options to reshore copper and other critical manufacturing back to the United States." That is not a rejection. It is simply not the confirmation the copper market had been trading on. Commerce Secretary Howard Lutnick was asked to update the president by June 30, 2026. Reuters said it was not immediately clear what he recommended.
How the market moved
Metals prices at Thursday's close (Sept. 10):
- LME copper (London Metal Exchange, the global benchmark for industrial metals): $14,312 a tonne, down 3.1%, after an intraday record of $14,875 — per 24/7 Wall St.
- COMEX copper (the New York metals exchange where U.S. copper trades): $6.59 a pound, down 4.4%, one day after a record $6.89 — per The Northern Miner.
Equities on the same session:
- Freeport-McMoRan: down about 8% to $70.43 (24/7 Wall St)
- Southern Copper (NYSE: SCCO), an Americas copper producer with mines in Peru and Mexico: down 7% to $195.66
- Teck Resources (NYSE: TECK), a Vancouver-based copper and zinc miner: down 7% to $65.08
- Hudbay Minerals (NYSE: HBM), a mid-sized Canadian copper miner: down 7.7% to $26.60 (The Northern Miner)
- Rio Tinto (NYSE: RIO): down 4.2% to $99.33 (The Northern Miner)
- Global X Copper Miners ETF: down 7% (24/7 Wall St)
The metal fell. The miners fell harder. That part is ordinary, because a producer's profit is the price minus a cost that does not move with it. Freeport fell hardest among the large names, and there is a specific reason for that.
Why it matters
A decision Washington has not made is now one of the biggest variables in copper. That is a strange place for an industrial metal to sit. Copper is normally priced off mines, smelters, warehouses and factory orders. For much of this year it has been priced off a memo.
The reason is structural. Refined copper is interchangeable and cheap to ship. Tax it at the American border, and the U.S. price separates from the world price. Decline to tax it, and the two converge again. There is little middle ground, so the market keeps reaching for a binary answer.
That makes these shares sensitive to reporting rather than to results. Earnings arrive on a schedule. A policy leak does not. The exposure also runs along geography. Producers selling metal inside the United States carry it. One of them sits further inside that fence than any other.
Why Freeport is the pure play
Freeport operates one of only two active copper smelters in the United States and says it accounts for roughly 70% of the refined copper produced domestically. Rio Tinto runs the other one. The company puts its share of U.S. mine output at about 60% for 2025. Those figures are the company's own, from its corporate site.
The pricing mechanism matters more than the market share. In its first-quarter 2026 earnings release, Freeport states that sales from its U.S. copper mines are "generally based on prevailing Commodity Exchange Inc. (COMEX) monthly average settlement copper prices." Those U.S. mines are guided to about 1.4 billion pounds this year, against roughly 3.1 billion pounds consolidated. Nearly half of Freeport's copper is priced on the very exchange a tariff would lift.
Peers do not have that. A Chilean or Peruvian producer sells into a world priced off London. A U.S. duty raises the price of metal delivered in America, and Freeport is already inside the fence. That is why the same headline costs it more.
The gap between the two exchanges is the tariff
Here is the arithmetic the wire copy skipped. The two exchanges quote the same metal in different units, which makes a direct comparison easy to skip. Do it, and the tariff shows up as a single number:
- A tonne is 2,204.62 pounds. London's close of $14,312 a tonne is therefore $6.49 a pound.
- COMEX closed at $6.59 a pound.
- The gap: ten cents, or about 1.5%.
- The duty under review: 15% from Jan. 1, 2027, stepping to 30% a year later.
- Fifteen percent of Thursday's London price: about 97 cents a pound.
So the American market closed Thursday carrying roughly a tenth of the duty it spent the summer anticipating. That is the recomputation. The wires reported a selloff in copper; what actually happened is that the premium for being inside the United States thinned to almost nothing.
One caveat belongs here, and it is a real one. The front-month COMEX contract settles long before January 2027, so it cannot cleanly price a duty that starts then. Part of those ten cents reflects the physical squeeze in American warehouses rather than trade policy. Read the exchange gap as a rough gauge of the odds, not a precise instrument.
Sizing the prize against the punishment
The next question is what the pending duty is worth in dollars, and how that compares with what the market just charged for the delay. Both halves are simple multiplication:
- Duty applied to volume: 15% of $6.49 a pound, across 1.4 billion pounds of U.S. sales, is about $1.4 billion of extra revenue a year.
- For scale: Freeport earned $984 million attributable to common stock in the second quarter, per its second-quarter earnings release.
- Shares outstanding: 1,436,017,523 as of July 31, per the cover page of the second-quarter Form 10-Q, the quarterly report U.S. companies file with securities regulators.
- An 8% decline from Thursday's $70.43 close removes about $8.8 billion.
- $8.8 billion divided by $1.4 billion: more than six years.
The revenue figure is before tax, and it assumes costs and volumes hold while the price moves. It is deliberately a gross number, because that is the cleanest way to see the scale of what is being argued about in Washington.
That ratio is not a verdict, and it should not be read as one. A duty, once proclaimed, pays every year rather than once, so six years of benefit is not an obviously wrong price for a policy that could run a decade. What the arithmetic does show is the shape of the trade. The stock is moving on the odds of a signature, not on copper coming out of the ground.
This is also why a stalled decision hurts more than a clean rejection would. A no releases the warehoused metal, resets the price, and lets everyone reprice the miners on production. An indefinite maybe keeps the inventory parked and the equities hostage to the next headline. Delay has a carrying cost, and somebody pays it every day.
The market has run this play before
It lost the last time, and the loss was violent. Section 232 is the trade law that lets a president tax imports on national-security grounds. The copper investigation run under it was widely expected to sweep in refined metal along with everything else. The market positioned for exactly that.
The scale of the misjudgment is worth setting out plainly:
- Before July 30, 2025, U.S. copper traded at a wide premium to London — roughly 28%, per contemporaneous market reports.
- The proclamation imposed 50% on semi-finished copper — pipe, wire, rod — effective Aug. 1, 2025.
- Refined cathode was explicitly excluded.
- COMEX copper fell more than 19% in minutes, which ING called the largest intraday fall on record.
- The same order told Commerce to report back by June 30, 2026, and floated the schedule now in limbo.
The premium never returned at anything close to that scale. Thursday's ten cents is what is left of it. Traders who lived through 2025 have been sizing this position with that memory intact.
Where the copper actually went
The metal kept moving to America regardless. COMEX warehouses held around 680,000 tonnes by early September, roughly eight times the level at the start of 2025, on ING's figures. July inflows topped 220,000 tonnes, a monthly record.
That inventory is a position, not a supply cushion. Someone paid to move it, is paying to store it, and needs the American price to stay above the world price for the trade to work. That is the constituency the Reuters report unsettled, and it extends well beyond the mining sector.
What we wrote six days ago
LineVest covered Freeport's second quarter on Sept. 4. The piece argued that the commodity cycle and the company's own operating cycle were unusually far out of phase. Copper was setting records while Freeport's volumes were still recovering from the September 2025 mud rush at the Grasberg Block Cave mine in Indonesia. Revenue fell 7.3% from a year earlier even as the realized copper price rose 36%.
Thursday closed that gap from the wrong end. The price leg gave way while the volume leg is still climbing. London's Thursday close of $6.49 a pound sits below the record $6.56 settlement of Aug. 6, 2026 that Freeport disclosed in its second-quarter filing. The record the company reported one month ago has already been handed back.
Goldman Sachs published a note the same afternoon arguing the selloff had left Freeport attractively valued, according to Seeking Alpha. LineVest takes no view on that question.
