Rio Tinto Company and the Zinc Corporation merge, forming The Rio Tinto – Zinc Corporation (RTZ) and Conzinc Riotinto of Australia (CRA), its main subsidiary.
In 1995, RTZ and CRA themselves merge and become a dual-listed, Anglo-Australian company: the Rio Tinto Group.
https://www.riotinto.com/about/business/history
https://web.archive.org/web/20090327021733/http://www.riotinto.com/documents/Investors/dlcsep06.pdf