Bauxite Deposits of Odisha

Geological Formation of Bauxite

Bauxite, the primary ore of aluminium, occurs in Odisha as cappings on the high plateaus of the Eastern Ghats, formed by the intense and prolonged chemical weathering of the underlying khondalite rocks. Khondalites — garnet-sillimanite-graphite schists of the Eastern Ghats Granulite Belt — are aluminium-rich silicate rocks. Under the hot and humid tropical conditions that have prevailed over millions of years, silica has been leached out of these rocks, leaving behind a residual concentration of hydrated aluminium oxides — gibbsite, boehmite, and diaspore — which together constitute bauxite. This process, known as lateritisation, has been most effective on the flat, stable plateau surfaces of the Eastern Ghats, such as the Panchpatmali plateau in Koraput and the Niyamgiri plateau in Kalahandi, where deep weathering profiles could develop without significant erosion. The bauxite deposits of Odisha are of the ‘blanket’ or ‘capping’ type, forming a tabular body typically 5 to 40 metres thick at or near the plateau surface.

Distribution and Reserves

Odisha possesses the largest reserves of bauxite in India, estimated at over 2,000 million tonnes, accounting for approximately 69 per cent of the country’s total bauxite resources. These deposits are concentrated along a north-south belt in the Eastern Ghats, spanning the districts of Koraput, Rayagada, Kalahandi, Kandhamal, and Malkangiri. The key deposits include:

The Panchpatmali Mine

The Panchpatmali bauxite deposit in Koraput district, situated on a plateau at an elevation of about 1,200 metres, was the first major bauxite deposit to be brought into commercial exploitation in independent India. The mine is operated by the National Aluminium Company Limited (NALCO), a Government of India enterprise established in 1981, as a captive source of raw material for its integrated aluminium complex at Angul and its alumina refinery at Damanjodi, located at the foot of the Panchpatmali plateau. The bauxite is transported from the mine to the refinery via a 14.6-kilometre-long cable ropeway, one of the longest in Asia, which descends nearly 700 metres. NALCO’s refinery at Damanjodi has a capacity of 2.275 million tonnes per annum of alumina, and its smelter at Angul produces around 460,000 tonnes of aluminium annually. NALCO is one of the lowest-cost producers of alumina and aluminium in the world, a direct consequence of the high grade and easy accessibility of the Panchpatmali bauxite.

The Niyamgiri Controversy

The Niyamgiri Hills in Kalahandi district, sacred to the Dongria Kondh tribe (a PVTG), contain high-grade bauxite deposits that the Vedanta Group (through its subsidiary Sterlite Industries) sought to mine to feed an alumina refinery at Lanjigarh. This proposal became one of the most significant environmental and tribal-rights legal battles in Indian history. The Dongria Kondh’s opposition, supported by national and international environmental organisations including Survival International, and the intervention of the Supreme Court of India resulted in a landmark judgment in 2013. The Court mandated that the gram sabhas (village assemblies) of the affected Dongria Kondh settlements must be consulted, and the gram sabhas unanimously rejected the mining proposal. The Supreme Court subsequently refused permission for mining, effectively halting the project. The Niyamgiri case set important precedents regarding the rights of indigenous communities under the Forest Rights Act, 2006, the Panchayats (Extension to Scheduled Areas) Act, 1996, and the principle of Free, Prior and Informed Consent (FPIC).

The Aluminium Industry and Future Prospects

The availability of bauxite has catalysed a substantial aluminium industry in Odisha. Beyond NALCO, Vedanta operates a 2-million-tonne alumina refinery at Lanjigarh (currently sourcing bauxite from outside Odisha), and Hindalco (Aditya Birla Group) operates a refinery at Sambalpur. These plants make Odisha one of India’s primary aluminium-producing hubs, contributing significantly to the national output. The state’s bauxite reserves are large enough to support expanded production for decades, but the challenge lies in reconciling mineral extraction with the rights of tribal communities and the imperative of environmental conservation. The Odisha Government has been exploring a balanced approach, identifying bauxite deposits that can be mined with minimal displacement, while committing to preserve the most ecologically and culturally sensitive areas. The future of bauxite mining in Odisha hinges on transparent, participatory decision-making processes and strict adherence to environmental regulations and benefit-sharing mechanisms with local communities.