After completing a switch to 100% green energy earlier this year, Apple is trying to pack more renewable materials into its latest iPhones.

The new iPhone Xs and iPhone Xr will used recycled tin in their logic boards, preventing 10,000 tons of tin ore from being mined per year. The phones will also use 35% post-consumer recycled plastic in their speaker enclosures, and 32% bio-based plastic for the frame around the cover glass.

“We hope to one day eliminate our need to mine new materials from the earth,” Lisa Jackson, Apple’s vice president of environment, policy, and social initiatives, said during a press event on Wednesday.

Read more at FastCompany.com.