Atalaya Mining PLC Announces First Quarter 2021 Operations Update Proyecto Riotinto Operating Highlights: 52,000 - 54,000 Copper production in Q1 2021 was 13,979 tonnes, 5.7% higher than Q1 2020 although slightly lower than Q4 2020 due to lower copper grades and recoveries during the Period. As a result of the robust copper price environment and strong mill performance, the Company continues to supplement mill feed with some stockpiled lower grade ore in order to maximise the long-term value of the orebody. The plant processed a record 4.0 million tonnes of ore during Q1 2021 despite seven days of planned maintenance stoppage during February, which were offset by a new monthly performance record in March when 1.5 million tonnes were processed.