Shares in Gold Fields closed up 3.86 percent higher at 51.06 rand and AngloGold shares jumped 2.40 percent to 170.00 rand.

"The share price did react fairly sharply after that," said Ryan Woods, trader at Independent Securities, referring to speculation about a merger.

AngloGold, Africa's biggest gold miner, declined to comment on speculation it was looking at a tie-up.

(Reporting by Tanisha Heiberg; Editing by James Macharia)