Last week Glencore warned that some buyers in China reneged on contracts after seeing prices plunge, forcing the company to renegotiate the commercial terms of the deals.
Paulson's campaign could have implications across the sector, where activism is historically low, returns have been disappointing, compensation is above-average and insider ownership is below-average.
Aurizon's 4 major railways in the Bowen Basin of Queensland, the world's largest coking coal export region, carry coal from mines owned by BHP Billiton , Glencore , Anglo American and Peabody Energy.
The Toronto-based company, which already owns 15% of Reunion, said the fresh $2.27-million investment leaves its stake in the Quebec-based miner unchanged.