NAIROBI, Aug 21 (Reuters) - Thungela Resources, South Africa's largest shipper of coal burned in power stations, suffered a 69% drop in first-half profit, hit by lower prices and transportation problems, it said on Monday.

The Johannesburg-based thermal coal producer spun off from Anglo American in 2021 added that the challenges could force it to "resize the portfolio". (Reporting by Felix Njini Editing by David Goodman )