Santiago, October 1, 2026: Supervisors at BHP’s Escondida copper mine in Chile, the world’s largest copper mine, have rejected the company’s latest collective contract offer, opening the way for a potential strike at the major mining operation.
The supervisors’ union, representing around 1,020 members, voted overwhelmingly against the proposal, with 95% of participating members voting in favour of strike action, according to the union. The rejection follows weeks of negotiations between the company and employees over a new collective agreement.
Mandatory Mediation Before Strike
Under Chilean labour law, the rejection does not mean an immediate work stoppage. The company and union must first enter a mandatory five-day government-led mediation process. The mediation can be extended by another five days if both sides agree.
If an agreement is not reached through the process, the union could proceed with a legally sanctioned strike.
Disagreement Over Pay and Work Conditions
The union has argued that BHP’s offer does not provide a significant improvement over the existing agreement. Supervisors have also objected to proposals that could require them to undertake additional operational duties, including training to perform tasks such as operating heavy equipment.
The union’s rejection comes shortly after a maintenance-related accident at Escondida in which a worker died. The supervisors had also rejected BHP’s request to extend negotiations following the incident.
BHP, however, said its proposal includes improvements and new benefits compared with the existing collective agreement. The company has indicated that it may seek mandatory mediation in an effort to reach an agreement.
Potential Impact on Copper Supply
Escondida is a major contributor to global copper supply, making labour developments at the mine closely watched by the metals market. The mine is operated by BHP, which owns 57.5%, while Rio Tinto holds 30% and Japan Escondida Corporation owns the remaining 12.5%.
The labour dispute comes at a sensitive time for Chile’s copper sector. The country recorded its lowest monthly copper production in more than 15 years in August, adding to concerns about supply disruptions.
For now, no strike has begun. The immediate focus will be on the government-mediated negotiations and whether BHP and the supervisors’ union can reach a new agreement before industrial action becomes possible.