Tinkler Group's Nathan Tinkler

Tinkler Group's Nathan Tinkler

Martyn Rushby/Aston Resources Ltd. via Bloomberg

Nathan Tinkler, the 37-year-old electrician turned miner who sold his house in 2006 to buy into a coal mine, made a A$5.3 billion bid ($5 billion) for Whitehaven last year, which collapsed in August as coal prices fell.