Associated Press reported that Chilean port workers are returning to work after reaching a deal to end three weeks of strikes that blocked exports of copper.

The stoppage in the world’s No.1 copper producing nation began in the northern port of Angamos when workers demanded 30 minute lunch break. Dockers in 10 other ports joined in solidarity.

The Ultraport company managing the Angamos port agreed late Friday to compensate workers with a bonus following negotiations mediated by Chile’s work minister.

The strike caused worries because Chile produces a third of the world’s copper and its stable economy is built around exports of minerals.