Replies to post #289 on Ioneer Ltd (IONR)

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Ioneer Wednesday, 26 April 2023

Wednesday, 26 April 2023 – Ioneer Ltd (“Ioneer” or the “Company”) (ASX: INR, NASDAQ: IONR) is
pleased to announce an updated Mineral Resource estimate for the South Basin at the Rhyolite Ridge
Lithium-Boron Project located in Nevada, USA. The effective date for the updated Mineral Resource
estimate is March 31, 2023.
WSP USA Inc. (‘WSP’; formerly Golder Associates Inc.) estimated the March 2023 Mineral Resource
and provided the previous (2020) Mineral Resource and Ore Reserve estimates for the Rhyolite Ridge
Definitive Feasibility Study (‘DFS’)2
completed in April 2020.
The updated South Basin Mineral Resource estimate comprises:
• Tonnage increase from 146.5 Mt to 360.0 Mt (up 145%)
• Lithium carbonate equivalent (LCE) increase from 1.2 Mt to 3.4 Mt (up 168%)
• Boric acid equivalent (BAE) increase from 11.9 Mt to 14.1 Mt (up 18%)
• Cut-off grades unchanged at 1,090ppm Li and 5,000ppm B

https://wcsecure.weblink.com.au/pdf/INR/02657829.pdf