Hecla Mining Co. Feb. 22 reported that its 2016 exploration program successfully replaced the 11.9 million ounces of silver and 79,150 oz of gold mined at its Greens Creek Mine in Southeast Alaska last year, leaving reserves of both precious metals virtually unchanged.

Greens Creek ended 2016 with 7.59 million tons of reserves averaging 11.7 oz/ton (88.87 million oz) silver; 0.09 oz/t (673,000...