Acacia Mining Plc jumped to the highest in almost two months after the gold miner confirmed it is in early-stage talks with rival Africa-focused producer Endeavour Mining Corp. about a possible merger of the two companies which have a combined value of about $4 billion. Acacia, which mines the precious metal in Tanzania, rose 4 percent to close at 435 pence in London, the highest since Nov. 21, after earlier rising as much as 7.7 percent.