South African tanker and bulker owner Grindrod has released preliminary indications for the half year showing the company is set to record another leap in income.



Though detailed financial statements are not due out until 15 August, the Johannesburg-listed company said first-half profits had risen between 20% and 23%.



Higher shipping rates and a weaker rand are behind the results.



Grindrod's stock has more than doubled in the past twelve months.

The