Tata Steel has picked up a 14.99 per cent stake in Sydney-based Riversdale Mining, which owns coal mines in South Africa and Mozambique. Tata Steel has steadily bought into Riversdale, listed on the Australian Stock Exchange, through its Singapore-based subsidiary Tata Steel Global Minerals Holdings. In a filing before the Australian Stock Exchange earlier this week, Tata Steel Global Mineral said it had acquired a 4.99 per cent stake in Riversdale through market purchases at an estimated investment of $41 million (Australian), or Rs 143 crore. When contacted, a spokesperson for Tata Steel declined to comment. […]