The government has said they must adhere to the 2007 law requiring at least 51% of shares to be held by locals.

The policy has divided the Zimbabwean authorities, with the reserve bank and finance ministry arguing it could damage the economy.

The latest deadline also includes hotels and telecommunications firms.

It follows a deal earlier this year with one of the world's biggest platinum producers, Impala, to transfer a 51% stake in its Zimplats subsidiary.