Tin production fell 63 percent, as the country's sole tin producer, Minsur, halted production at its San Rafael tin mine in the Puno region in mid-January amid violent protests. The mine resumed production last week.
Silver production fell 19.9 percent, molybdenum 12.4 percent, zinc 6.9 percent, gold 6.8 percent and lead 6.7 percent.
