Initial reporting of lithium mineral resources and ore reserves: supporting information and table 1 checklists / Исходный отчет о минеральных ресурсах и рудных запасах лития: вспомогательная информация и проверочная таблица 1

Rio Tinto today announces initial reporting of Mineral Resources and Ore Reserves for seven lithium assets acquired as part of the purchase of Arcadium Lithium, namely:

• Four lithium brines deposits: the Fenix and Olaroz operations, and the Sal de Vida and Cauchari projects in Argentina

• Three hard rock spodumene deposits: the Whabouchi and Galaxy projects in Northern Quebec, and the Mt Cattlin operation in Western Australia

This is first reporting by Rio Tinto of these Mineral Resources and Ore Reserves in accordance with the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves, 2012 Edition (JORC Code) and the ASX Listing Rules. Supporting information relating to the Mineral Resources and Ore Reserves is set out in this release and its appendices. Mineral Resources and Ore Reserves are quoted in this release on a 100 percent basis. The figures used to calculate Mineral Resources and Ore Reserves are often more precise than the rounded numbers shown in the tables, hence small differences may result if the calculations are repeated using the tabulated figures.

Mineral Resources are reported inclusive of Ore Reserves for lithium brines deposits1, and in addition to Ore Reserves (exclusive) for hard rock spodumene deposits. <...>