Silver is mainly recovered as a byproduct of the bulk mining of other metals such as copper, lead, zinc and gold. Where in the United States do you think silver recovery would happen?

Explanation:

This question appear incomplete because of the absence of options. However, places where silver recovery would happen in the United States are states where huge mining of copper, lead, zinc or gold are been mined. Examples of such places include Arizona, California and Oregon; where copper (and some other metals in some cases like gold in Oregon) is heavily mined and silver is recovered as a byproduct.