Argyle Diamond Mine Kimberley Mining
In September 2021 Rio Tinto announced an investment of $803m to complete the project The money was used to ramp up the underground block cave in order to extend the mine s life to 2021 The Argyle mine was converted from open cut to underground operations in 2021 and the underground mine became operational by 2021 Since it started production in 1983 Argyle produced more than 865