Tokyo 2020 Medal Project: Towards an Innovative Future for All.
'The Tokyo Organising Committee of the Olympic and Paralympic Games (Tokyo 2020) conducted the “Tokyo 2020 Medal Project” to collect small electronic devices such as used mobile phones from all over Japan to produce the Olympic and Paralympic medals.'
(Tokyo Organising Committee of the Olympic and Paralympic Games) >

https://olympics.com/tokyo-2020/en/games/medals-project/