Peru, the world’s second largest copper producer, began a strict quarantine in mid-March, while in May the government ordered the gradual restart of some key industries, a move that allowed miners to starting ramping up production.

The national INEI statistics agency said May copper output fell by 42.2%, while that of gold was down 65.1%. Zinc production tumbled 75.7% and silver 65.8%.

Mining is key for Peru because exports from the sector represent 60% of the South American country’s total.

Among other economic activities, the INEI said that the fishing sector fell by 46.99% in May, while cement consumption contracted 65.05%.