Chilean state-owned mining company Codelco resumed shipments of copper after a port strike blocked exports in the world’s top copper producing nation earlier this month.

Port workers returned to work after reaching a deal to end three weeks of strikes that halted shipments of copper, fruit and wood pulp in the export-dependent nation. The strikes caused serious concerns because Chile produces a third of the world’s copper and its solid economy is built around mineral exports.

About 60,000 metric tons of Codelco’s copper was stuck at port and the company lost more than $500 million since the strike began.

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