By Cecilia Jamasmie Chrome producer Tharisa (LON:THS)grew its exposure to Zimbabwe on Wednesday by acquiring a 26.8% stake in Karo Mining Holdings for $4.5 million, gaining access to 23,903 hectares of land in the country Great Dyke, which has a potential for 96 million ounces of platinum and palladium. Land is said to contain the world’s largest known platinum group metal (PGM) deposits outside of South Africa. The miner, which last month bought chrome business Salene in the landlocked country, said the area contained the world’s largest known platinum group metal (PGM) deposits outside of South Africa.