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Dr Humphreys was appointed to the Board of Petropavlovsk "in August 2011. Dr Humphreys has a broad range of experience in the global mining industry through his work for mining companies and as a consultant and academic. He was chief economist at Norilsk Nickel, Russia’s largest mining company, from 2004 to 2008. He was previously with Rio Tinto for 18 years, the last eight of these as the company’s chief economist. Prior to joining Rio Tinto, Dr Humphreys worked for nine years in the UK government service, for six of these as an advisor on minerals policy."