JAKARTA, July 12 (Reuters) -
* The Indonesian government is expected on Thursday to announce the details of a deal to acquire a majority stake in the local unit of U.S. copper miner Freeport McMoRan Inc FCX.N , a source with knowledge of the matter said
* Announcement expected to include the share price, amount and structure of the deal
* Finance Minister Sri Mulyani Indrawati is scheduled to sign a heads of agreement with PT Freeport Indonesia at 4 p.m. on Thursday, a ministry spokesman said
* Representatives from Freeport and state-owned mining holding company PT Inalum, along with the ministers of state-owned enterprises, energy and mineral resources, and the environment are expected to attend the signing