NAIROBI, Sept 11 (Reuters) – The following company announcements, scheduled economic indicators, debt and currency market moves and political events may affect African markets on Thursday. – – – – – EVENTS: ZIMBABWE – Finance Minister Patrick Chinamasa is expected to present his half-year budget statement. SOUTH AFRICA – August Reuters Econometer to be released. Reuters polls for South Africa’s long term economic prospects. SOUTH AFRICA – Statistics South Africa releases mining output