Loss-making Russian gold miner Petropavlovsk lost a quarter of its market value on Monday after unveiling plans for a deeply-discounted $235 million share issue as part of a refinancing deal that will help to cut its debts. The London-listed miner, hit by a fall in gold prices in 2013, has been in talks since April with bondholders over $310.5 million worth of convertible bonds that mature in February 2015. The company said its chairman Peter Hambro and chief executive Pavel Maslovsky could support a $235 million rights issue at 5 pence per share.