A strike at Antofagasta’s Centinela copper mine in Chile began on Wednesday 7 October 2026. Unions say the full effect will come in November, when production “could decrease by half”. That is the unions’ estimate; Antofagasta declined to comment on it.
Spotted via @business on X
What is confirmed
Confirmed: a strike is under way. Reuters reported that labour groups launched it after government-mediated negotiations with management failed to produce a deal [1]. Labour representatives want all workers to receive the same benefits regardless of union affiliation; Antofagasta says that since 2020, bargaining schedules have been separate [1]. The unions represent “more than half of Centinela’s critical mine operators and over 60% of equipment maintenance workers” [1].
What is the unions’ claim
Reported (Reuters): the estimate is the unions’. The unions said the initial impacts will “gradually worsen due to the large amount of waste rock that will need to be removed”, with the full impact expected in November [1]. Antofagasta “previously said it would maintain its production guidance despite the strike” and “declined to comment on the union’s latest production estimates” [1]. The company has not confirmed any fall in output.
Reported (Bloomberg): a hunger strike. On Friday 9 October, Bloomberg said workers at an Antofagasta copper mine in Chile escalated the strike, “with three union members starting a hunger strike” [2]. TSN could not read the Bloomberg article, only its post on X, which does not name the mine.
What it did to the copper price
Reuters reported on 9 October that copper was on track for a weekly gain of “2.0%”, with the benchmark three-month contract on the London Metal Exchange “up 1.6% at $14,541 a metric ton” at 1604 GMT. It cited mine supply disruptions, active demand in China and tight inventories outside the US [3]. Reuters does not say the strike alone drove the move.
Possible US tariffs also matter. Reuters said copper has been supported by shipments to the US “ahead of potential import tariffs on refined copper”, and that Comex stocks stand at “a record 711,609 tons” [3]. No US tariff on refined copper has been announced; Reuters reported on 10 September that the White House “has not yet made a decision” [4]. Morgan Stanley said in a note: “Any slowdown in US stockpiling could make the market feel looser, but China’s demand has been resilient and supply is facing significant disruptions” [3].
What this does not show
- A fall in output. The halving is a union forecast, and the company has not confirmed it.
- The strike as the cause of the price rise. Reuters lists several factors.
- A US tariff. It is a possibility, not a decision.
The Bottom Line
The strike is real and the unions say November is when it will bite. Until Antofagasta says what has happened to output, “half” is one side’s estimate.
Related on TSN: The Metal Backbone of AI: Essential Minerals Powering Growth in 2026
Sources
- Reuters, “Strike could cut November output at Chile’s Centinela copper mine by half, unions say”, via Mining Weekly, 9 October 2026. https://www.miningweekly.com/article/strike-could-cut-november-output-at-chiles-centinela-copper-mine-by-half-unions-say-2026-10-09
- Bloomberg (@business), post on X, 9 October 2026, 23:00 BST, linking “Antofagasta Miners Escalate Copper Strike With Hunger Protest” (article not readable; TSN saw the post and its link card only). https://x.com/business/status/2108679011836559846
- Polina Devitt, “Copper price heads for a weekly gain on mine supply risks, China demand”, Reuters via Kitco, 9 October 2026. https://www.kitco.com/news/off-the-wire/2026-10-09/copper-price-heads-weekly-gain-mine-supply-risks-china-demand
- Reuters, “White House copper tariff plan stalls amid affordability concerns, sources say”, via Kitco, 10 September 2026. https://www.kitco.com/news/off-the-wire/2026-09-10/white-house-copper-tariff-plan-stalls-amid-affordability-concerns
Background: The Metal Backbone of AI: Essential Minerals Powering Growth in 2026
