Rutongo Mines sit 26km north of Kigali, comprising six underground tin mines – Gisanze, Masoro, Nyamyumba, Gasambya, Karambo and Mahaza. Together, they contain one of the biggest cassiterite deposits in Africa. The Rutongo mines operate under a 25-year license that began in 2015. They are estimated to contain approximately 54,000 tonnes of ...