Mediation between Antofagasta Minerals and two unions at its Centinela copper mine in Chile concluded after three days with no progress, Bloomberg reported, and the unions could now walk out from October 7. SP Angel’s October 5 market note flagged that this would be the first strike ever at an Antofagasta operation. The unions had already rejected the company’s collective contract offer, with IndexBox reporting on September 29 that 98.73 percent of members voted against it.
Centinela is one of Antofagasta’s core Chilean copper assets, and the timing is awkward for supply. Copper closed October 5 at $14,340 per tonne, its highest since May, on weak US jobs data that eased pressure on the Federal Reserve. A strike at Centinela would tighten an already firm market and could lend near-term support to prices if it persists. Antofagasta has not publicly detailed contingency plans or expected production impact; no output guidance change has been announced.
The dispute is not isolated. Fastmarkets reported on October 1 that unions at Escondida (BHP), Centinela and Philex’s Padcal mine had all voted for strike action, pointing to a tense Chilean bargaining season. Whether Centinela’s two unions actually walk out on October 7 is the immediate catalyst to watch; a settlement would unwind the risk premium just as quickly.