Sierra records 36% y/y increase in first-quarter copper production

For the first quarter of this year, TSX-listed copper producer Sierra Metals has recorded a 36% year-on-year increase in consolidated copper production of 11.2-million pounds from its two underground mines in South America, the Yauricocha polymetallic mine, in Peru, and the copper-producing Bolivar mine, in Mexico. Silver production was also up 10% year-on-year, while gold production increased by 19% and lead production by 10%.