CONAKRY, Dec 27 (Reuters) - The head of Guinea's military junta which took power earlier this week, Capt. Moussa Dadis Camara, said on Saturday his administration will revise mining contracts if they are badly structured. "If the contracts are defective, experts will study them and they will be revised," Camara said. (Reporting by Saliou Samb; Editing by Daniel Magnowski)