A miner works at a cassiterite and tantalum ore in a semi-industrial mineral processing plant in Gatumba in western Rwanda, November 25, 2009. A joint venture between the Rwandan government and a Mauritius-based company is positioning the central African country to ramp up exploitation of coltan, a mineral that is crucial to the manufacture of mobile phones. Picture taken November 25, 2009. To match interview RWANDA-MINING/ REUTERS/Hereward Holland (RWANDA BUSINESS ENVIRONMENT)
REUTERS/STR