Work begins again Friday at Peru’s Cerro Verde mine. The country’s largest copper mine, owned by Phoenix-based Freeport McMoRan, has been on strike for three weeks.

Output has been cut in half. 

This resolution comes as Freeport reassures workers at its Grasberg mine in Indonesia that work will resume shortly.

Grasberg accounts for 30 percent of Freeport’s copper production annually. Peru’s Cerro Verde is one of the largest copper mines in the world. 

Freeport’s stock price rose six percent after the announcement.