Chile Copper Output Risk Put at 5.2% as Strikes, Storms and Geology Hit Top Mines
A new Production-at-Risk Index from GEM Mining Consulting puts an average 5.2% of output at Chile's 14 largest copper mines at risk, with El Teniente at 9%, Los Pelambres at 8% and Escondida at 7.5%. The assessment lands as more than 700 workers strike at Antofagasta's Centinela and Chilean production runs 9.3% below 2025 levels through July.
Strikes, severe weather, accidents and geological problems put an average 5.2% of production at Chile's largest copper mines at risk, according to GEM Mining Consulting's first Production-at-Risk Index, reported by MINING.COM on 8 October. The study assessed 14 major operations across eight threat categories, with scores ranging from 2.6% to 9%. El Teniente ranked highest at 9%, followed by Los Pelambres at 8% and Escondida at 7.5%, while nine operations carry at least one risk rated high. The index is an exposure measure rather than a forecast, but it shows why headline capacity can differ from dependable supply.
The findings follow a turbulent few months in the world's largest copper producer. Workers at Antofagasta's Centinela began an indefinite strike on 7 October after mediation overseen by Chile's Labour Inspectorate failed, with more than 700 workers walking off the job; the two unions represent about 22% of the mine's direct workforce, and the mine produced 240,400 tonnes of copper in 2025. BHP's Escondida shut after a fatal accident, and its supervisors remain in government-mediated wage talks after voting in favour of a strike, while storms disrupted Los Pelambres and Caserones and Codelco suspended the Andes Norte project at El Teniente over deep seismic risk. Chile produced 9.3% less copper from January through July than in the same period of 2025, with July output at its lowest monthly level since 2011.
GEM's model treats each high rating as an expected production loss of about 3%, or roughly 11 days of annual output, with medium at 0.75% and low at 0.19%, and compounds rather than simply adds the eight risks. Labour, and metallurgy and grades, are the biggest contributors at 0.83 percentage points each, with weather and safety at 0.79 each. Collahuasi's metallurgy risk is rated high after its ore grade fell to 0.90% from 1.15%, contributing to a 27% production decline in 2025; Chuquicamata carries high safety risk after restrictions following an accident drove a 13% decline; and Quebrada Blanca faces high ramp-up risk as construction of its tailings storage facility constrains output.
The supply picture is filtering into prices and inventories. LME three-month copper traded around $14,476 a tonne on 7 October, up 0.42% on the day, with LME copper stocks down 0.79% to 242,975 tonnes - the steepest fall in the complex - alongside declines in aluminium, nickel and lead, according to SteelMint's daily round-up. Aluminium slipped 0.53% to $3,117 a tonne with stocks down 0.62% to 238,875 tonnes, while nickel rose 0.34% to $15,735 with inventories down 0.28% to 284,178 tonnes; zinc was the only metal to build stocks, up 0.24% to 127,275 tonnes. Indonesia is meanwhile considering a moratorium on new semi-finished nickel capacity such as nickel pig iron and ferronickel to address persistent oversupply, a meaningful signal given it produced an estimated 2.6m tonnes of mined nickel in 2025, about 67% of global supply.