Please answer the following question: What type of details about tesfai ghebreselassie can be gathered from the following bio? Bio: tesfai ghebreselassie was eritrea 's minister of energy & mines since independence until 2011 . he has overseen agreements with anadarko and various gold mining and mineral companies . furthermore he has overseen the maturation of the eritrean electric authority . his portfolio was changed to that of the ministry of land , water & environment in 2011 .
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