Dec 20 (Reuters) - Tawana Resources NL TAW.AX
* Board of directors has unanimously decided to exercise option to acquire Lithco
* Tawana completes diligence on Bald Hill mine
* Acquisition will result in company becoming joint venture partner of Alliance Mineral Assets Ltd in Bald Hill Lithium, Tantalum Project. Source text for Eikon: Further company coverage: TAW.AX
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