Everest Metals has determined a JORC-compliant rubidium-lithium exploration target at its Mt Edon project in WA's South Murchison region, but says more work is required to quantify the geological system. The company has today outlined a resource target range of between 3.2 and 4.5 million tonnes, with potential grades going 0.23 to 0.35 per cent rubidium oxide and 0.08 to 0.12 per cent lithium oxide.