In Photos: Mobile phone metals to be used in 2020 Tokyo Olympic medals

Used mobile phones are seen piled up at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Used mobile phones are seen piled up at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Circuit boards containing gold and silver are removed from mobile phones at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Circuit boards containing gold and silver are removed from mobile phones at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Workers skillfully remove circuit boards from video game consoles at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Workers skillfully remove circuit boards from video game consoles at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Workers skillfully remove circuit boards from video game consoles at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Digital cameras and video cameras are seen piled up at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Digital cameras are seen piled up at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Workers skillfully remove circuit boards from desktop computers at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Workers skillfully remove circuit boards from desktop computers at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)

Circuit boards processed into chips are seen at a recycle factory of an affiliated company of NTT Docomo Inc. in Ishikawa Prefecture on Nov. 8, 2018, before their precious metals will be collected for the production of medals for the 2020 Tokyo Olympics and Paralympics. (Mainichi/Koichiro Tezuka)