KEY POINTS:
Centennial Coal shares had a record plunge after the Australian coal-miner said full-year profit may drop as much as 36 per cent because of production problems at two of its main mines.
The shares dropped 23 per cent after the Sydney-based company said it would write down the value of its Newstan mine by A$34 million ($39.4 million).
Profitability at the company's Tahmoor mine has also risen by less than expected.
