Barclays bank is playing a lead role in the establishment of a tax haven in Ghana, in a move that could see huge mineral wealth in west Africa vanish into it from poverty-stricken countries' coffers, the Observer can reveal…The process of establishing a Ghanaian tax haven has been under way since 2005 and Barclays was instrumental from the start…Barclays stresses that the creation of a tax haven in Ghana will be a source of high quality jobs and will encourage tourism and economic activity. The company said: "We adhere to the highest and most stringent levels of international regulation, rules and industry guidance…"