One of the leading copper producers in the world, Antofagasta Minerals, has just established a new labor agreement with a supervisors’ union. The contract covers supervisors at the firm’s top mine in Chile. Included in the agreement is a 1 percent salary increase, a signing bonus, and other employee incentives.
See "Chile's Antofagasta reaches labor deal with supervisors at Los Pelambres copper mine", Dave Sherwood, Reuters, October 15, 2019