At present, MOIL operates 10 mines, six located in the Nagpur and Bhandara districts of Maharashtra and four in the Balaghat district of Madhya Pradesh. All these mines are about a century old. Except 3, rest of the mines are worked through underground method. The Balaghat Mine is the largest mine of the Company. The mine has now reached a mining depth of about 383 meters from the surface. Dongri Buzurg Mine located in the Bhandara district of Maharashtra is an opencast mine that produces manganese dioxide ore used by dry battery industry. This ore in the form of manganous oxide is used as micro-nutrient for cattle feed and fertilizers. MOIL fulfils about 50% of the total requirement of dioxide ore in India. At present, the annual production is around 1.1 million tonne which is expected to grow in the coming years.