What did the two-year Tokyo 2020 Medal Project do, in respect of the medals created for the 2020 Olympic Games?

Question

From 1928 the obverse of medals awarded at the Olympic Games carried a picture of the Roman Colosseum. At which Games was this replaced by the Panathinaikon Stadium in Greece?

Answer 1

Collect recycled consumer electronics to provide the metal from which the medals were made
A total of 78,985 tons of used mobile phones, laptops, digital cameras and hand-held games were collected from which 30.3 kg of gold, 4,100 kg of silver and 2,700 kg of bronze were extracted. Using recycled metal was an element of previous Games, but the scale of the Tokyo project was unprecedented.