At least six people have died after a cassiterite mine collapsed in burundi , 120km ( 75 miles ) north of the capital .
布隆迪首都北部120公里处一座锡石矿发生坍塌，至少6人死亡。
Moreover , the congolese army is driving rebel groups closer to mining areas that have hitherto been considered fairly clean , such as the maniema province and north kivu 's bisie mine , which provides most of the country 's cassiterite .
