Korba is a city and an industrial area in Korba District in the Indian state of Chhattisgarh. Korba is headquarter of Korba district situated about 200 km. from the capital city Raipur. Korba is known for its coal mines such as Gevra Area which is one of the biggest coal mines of Asia as well as Kusmunda Area and Dipka Area, all located in Korba Coalfield. It also has power plants such as NTPC, CSEB and Bharat Aluminum Company. Korba Super Thermal Power Plant of NTPC is located at Jamanipali area. It receives coal from Gevra and Kusmunda mines and source of water for the power plant is Hasdeo River. Korba Thermal Power Station is owned and operated by Chhattisgarh State Power Generation Company. There are more small Power Plant near city like Hasdeo Thermal Power Station, Dr Shyama Prasad Mukharjee Thermal Power Station and Lanco Amarkantak Power Plant. Bharat Aluminium Company has plant which is one of the Asia's largest aluminium production industries. In 2009, chimney under construction by Gannon Dunkerley & Company at the Balco smelter collapsed killing 49 workers and GDCL management have been accused of negligence in the incident. Korba is connected to other parts of India through national and state highways. The city is directly connected to Raipur, Bilaspur, Durg, Bhilai Nagar, Rajnandgaon. Korba is also connected with national highways like NH200 etc. Korba railway station is connected to Champa, the nearest railway junction on the Howrah-Nagpur-Mumbai line. The stations comes under South East Central Railway Zone. It is directly connected to Bilaspur which the Divisional Headquarter by rail and road through Katghora-Pali-Ratanpur. The 50.7 km (32 mi) long, 1,676 mm (5 ft 6 in) broad gauge was constructed between 1953 and 1956, electrified in 1987 and 1988, and extended to Gevra Road railway station in 1988 and 1989. New line surveys of Indian Railway were taken during 2012 and 2013, and included a line from Renukoot-Korba via Ambikapur Katghora and Korba-Ranchi.