 About 30% of the world's silver production comes from primary silver mines; the balance is produced as a co-product from polymetallic, base metal, or gold mines.The Institute solicited input from stakeholders on the proposal, including its advisability, policy or technical issues, and any other related matters.Following receipt of stakeholder comments, all of which were supportive of the change, ICMI's Board of Directors approved the program's expansion, effective January 1, 2017.