I-Ferromanganese iwuhlobo lwe-ferroalloy olwakhiwe ngensimbi ne-manganese.yenziwa ngokushisisa ingxube yama-oxides MnO2 kanye ne-Fe2O3, nge-carbon, ngokuvamile njengamalahle ne-coke, kuhhavini eliqhumayo noma ohlelweni lomlilo we-arc kagesi, ebizwa ngokuthi isithando somlilo esingaphansi kwamanzi.