The Capstone Copper guidance cut is small. The bottom of the 2026 range moved from 200,000 tonnes to 195,000, and the top stayed at 230,000.
The market still reacted. The ASX CSC share price reaction on Friday was a 4.8% drop to $11.04 by 12:15pm AEDT. The stock is down 27% for the year.
Five thousand tonnes doesn’t explain that. Something else was being priced.
The Pinto Valley restart delay grew out of a job meant to be short
Pinto Valley sits in Arizona. In Capstone’s release, the plant was expected to resume in early November. Then crews commissioning the primary crusher found “a few of the major mechanical components” needed more work.
The parts are being built off-site by the original equipment manufacturer. Nobody can rush that. The crusher is now due back in mid-December.
In the meantime, Capstone is bringing in temporary mobile crushers. They should allow a partial restart of the concentrator in mid-November, at up to 40,000 tonnes a day.
Wind the clock back. On the second-quarter call, the plan was a 10-day shutdown in the third quarter. Management later said the work had already been pushed from May to September. Now it runs into December, if nothing else turns up.
That is a lot of Arizona mine maintenance for something sold as a short stop.
Pinto Valley’s crusher work has slipped from a planned 10-day stop to a mid-December finish.
Five thousand tonnes is small, but the pattern is not
Copper futures sat near US$13,641 a tonne on Friday. At that price, 5,000 tonnes is roughly US$68 million of revenue. Capstone booked US$358 million of adjusted EBITDA in the September quarter alone. The lost sales are under a fifth of that.
So the tonnes aren’t the worry. The trend is.
Capstone held its 2026 guidance at the March quarter result. It held again in the June quarter. In late October it said the year would land at the low end. Now the floor itself has moved. Every update since the middle of the year has stepped one rung down.
Pinto Valley is the common thread. Unplanned maintenance hit the filter plant in the first quarter, cut throughput again in the second, and struck once more in July and August.
The mine had produced 27,115 tonnes after nine months. Its original 2026 range was 42,000 to 48,000 tonnes. Even at 10,000 tonnes a quarter, Pinto Valley finishes the year in the high 30,000s. That is a back-of-envelope sum, not a company figure. It points to a miss against the mine’s own target that the group number is hiding.
Costs tell the same story. Pinto Valley’s C1 cost was US$6.11 a pound in the September quarter, against US$3.63 a year earlier. Copper is trading near US$6.20 a pound. A cash cost that close to the selling price leaves almost nothing for sustaining capital.
The 2026 copper production outlook now leans on a big fourth quarter
Add up the first three quarters: 47,960, 51,759 and 45,218 tonnes. That is about 144,900 tonnes. To reach 195,000, the fourth quarter needs roughly 50,000. To have reached the old 200,000 floor, it would have needed about 55,100.
The second quarter managed 51,759 with Pinto Valley running. The fourth quarter starts with Pinto Valley on borrowed crushers.
Management has said the final quarter was set up to be the strongest of the year. That case rests on the Mantoverde expansion ramping up and better grades in Chile. The expansion’s critical tie-ins were finished during a September shutdown. So the Chilean mines are carrying the load.
That is why the other item in the release matters. A national truckers’ strike over fuel prices is under way in Chile. Capstone says Mantoverde and Mantos Blancos are unaffected so far, thanks to preparation and on-site storage. But concentrate and cathode shipments are exposed, along with deliveries of fuel and sulphuric acid. Readers tracking the diesel supply crunch or the slide in sulphur prices will know how fast those inputs can swing.
Two risks now sit on one plan. Pinto Valley removed the cushion. Chile is where a second slip would come from.
One more wrinkle. The 195,000 figure includes a full year of Cozamin, the Mexican mine Capstone has agreed to sell to Luca Mining. The sale is expected to bring in up to US$385 million. Cozamin made 17,720 tonnes in the first nine months. Once the sale completes, group output steps down, and 2026 stops being a clean comparison for 2027.
The fourth quarter needs to land near the second quarter’s output to reach the new floor.
The next three dates will show whether the new floor holds
- Mid-November: mobile crushers restart the concentrator at up to 40,000 tonnes a day.
- Mid-December: the primary crusher is recommissioned.
- Q1 2027: the board’s Santo Domingo decision, pushed back from late 2026.
A floor that was just lowered has no padding. Capstone’s own 5,000-tonne estimate depends on when the mobile crushers perform and when the main crusher returns. A week’s slip in December costs little. A second parts delay costs a lot more.
Plain view: if the replacement components arrive on schedule, 195,000 is a fair bet. If they don’t, the number moves again. Copper near US$13,600 a tonne is doing Capstone a favour. The operations have to catch up, a theme that runs through Australia’s wider mining project delivery test.
For a different copper story on the ASX, see Evolution Mining’s copper-gold growth push.
Also Read: CBA ASIC lawsuit: a 27.5c fee, charged twice
FAQs
Q: Did Capstone cut its full-year range?
A: Only the bottom. The new range is 195,000 to 230,000 tonnes.
Q: When is the Pinto Valley crusher due back?
A: Mid-December 2026, per the company.
Q: How much copper does the delay cost?
A: About 5,000 tonnes in 2026, says Capstone.
Q: Where does Capstone trade?
A: On the ASX as CSC and on the TSX as CS.
Q: Is the Chile strike hitting output yet?
A: Not at Mantoverde or Mantos Blancos, per the company.
Disclaimer:
General information only, not financial product advice. Colitco does not consider your objectives, financial situation or needs. Speak to a licensed adviser before making an investment decision. Share prices and figures are as reported on 13 November 2026 and may change.
Luke Carlino is a seasoned Copywriter, Content Strategist, and Social Media Manager specialising in Mining, Finance, and Business journalism. With more than a decade of industry experience, he brings rigorous editorial standards and commercial acuity to every project.
