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Mbuji-Mayi was created in 1914.
The population of Mbuji-Mayi is 1,480,000.
The airport code for Mbuji Mayi Airport is MJM.
Assuming you mean the Millennium Star Diamond, owned by De Beers. According to Wikipedia:
"The diamond was discovered in the Mbuji-Mayi district of Zaire (Democratic Republic of the Congo) in 1990 in alluvial deposits..."
Taranis mayi was created in 1909.