(Sharecast News) - Cadence Minerals updated the market on the conditional heads of terms with Premier African Minerals on Friday, to earn up to 30% directly into the Zulu Lithium and Tantalum Project in Zimbabwe.The AIM-traded firm had announced that on 27 June."Cadence and Premier have agreed to extend the due diligence period on the Zulu Project by a further 20 days until 14 September," the board said in its statement.It explained that was a result of "unexpected interruptions" as a result of the recent elections in Zimbabwe.