Alaska mining activity climbed to new heights in 2006 with the value of exploration, development and production exceeding $3.5 billion. Production values more than doubled, leaping to $2.86 billion from $1.4 billion in 2005, according to Alaska's Mineral Industry 2006, an annual report released Nov. 7.

Continuing high zinc prices played a key role in the record-breaking tally for the industry,...