sentences:  The Greens Creek mine, owned by Hecla Mining, produced 8,452,153 troy ounces of silver.Teck Resources' Red Dog mine, the world's largest source of zinc, in 2014 produced 7.56 million troy ounces of silver as a byproduct of lead and zinc production.More than 80% of the state's silver was a byproduct of copper mining; other silver came as a byproduct of lead, zinc, and gold mining.