A protest near MMG’s Las Bambas copper mine in Peru has held up around $530 million of exports in the past three weeks, leading the firm to declare force majeure on deliveries. Las Bambas represented 14.7% of Peru’s copper exports in the 12 months to Nov. 30, with 51.5% of the mine’s output headed to China. Exports from the mine had previously surged 44.9% higher sequentially in the three months to Nov. 30. That led it to outpace its peers with total Peruvian copper exports down by 5.5% due to a slump in shipments linked to the Antamina mine owned by BHP and Glencore...