Canada-based, London-listed Nautilus Minerals Inc. sank to fresh lows in London, falling almost 5%, hit by the news of a Papua New Guinea’s landowners petition to the Government to cancel the firm’s seabed mining permit. The company, the first to explore the ocean floor for polymetallic massive sulphide deposits, was granted a mining lease by the PNG authorities in January 2011, following the environmental permit award in December 2009. But the mine developer has been swimming in choppy waters ever since. (Anglo American is a major shareholder in Nautilus.)