Doncaster-based UK Coal's borrowings rose from £182 million in December 2009 to £243 million last year, despite property sales bringing in £26.3 million after costs and related land purchases.
Production for the 12 months, ending on December 25, was 7.2 million tonnes – up from 7.0 million tonnes in the preceding year.
A total of 5.8 million tonnes came from deep mines and the rest from surface mines.
UK Coal improved its safety record, reducing the number of incidents that resulted in employees having to take time off work by 20 per cent.
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