BuzzFeed News:

Apple has announced a milestone in its five-year-long effort to ensure that the minerals used in its products are sourced responsibly and “do not finance armed conflict.” These “conflict minerals” are so called because the proceeds from their mining have at times been used to fund armed groups associated with murder, rape, and other human rights violations in the Democratic Republic of Congo and neighboring countries where they are mined.

As of today, all of the smelters and refiners that supply the tech company with conflict minerals are enrolled in a third-party auditing program, a process Apple COO Jeff Williams calls “a journey.”

From Apple’s previous conflict minerals report (covering calendar year 2014):

Apple’s strategy of continuous engagement and accountability has driven real change. The number of conflict-free smelters and refiners in Apple’s supply chain has more than doubled in the past year, so that a majority of the identified and reported smelters and refiners as of December 31, 2014 have been verified as conflict-free. More than 88% of the identified smelters and refiners have either successfully completed conflict-free audits or have begun the audit process, and Apple is working with its suppliers to verify the rest or remove them from its supply chain.

Looks like they’ve pushed that number from 88% to 100%.