Investment company Widespread Portfolios faces "developments that may have a material impact on the value of the company's assets", said director Chris Castle.
He recommended shareholders wait until Friday, when details of the developments would be made public, before trading any shares in the company.
Widespread invests principally in overseas-based mining and mineral exploration.
Shares in the company nearly doubled yesterday, up 14c to 29c.
'Don't sell' message from Widespread
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