Teck Resources Ltd. July 28 reported that the Red Dog Mine produced 260,000 metric tons (573.2 million pounds) of zinc during the first six months of 2021, more than a 22% increase over the 212,300 metric tons (468 million lb) of the galvanizing metal produced at the midway point of 2020.

Likewise, the Northwest Alaska mine produced 54,300 metric tons (119.7 million lb) of lead during the first...