Hecla Mining Company has a long-running practice of replacing reserves it mines each year at the Greens Creek Mine, a tradition it continued in 2016 despite producing a record 9.3 million ounces of silver at this high-grade underground operation in Southeast Alaska.

Going into 2017, Greens Creek had 7.6 million tons of proven and probable reserves averaging 11.7 oz per ton (88.9 million oz) si...