Overview
The Jharia coal fields have been burning beneath the ground for decades. A recent joint study by researchers from the UK and India, including the CSIR‑Central Institute of Mining and Fuel Research (CIMFR), reveals that the fire‑affected zones may be hotter and emit more greenhouse gases than earlier estimates.
Key Developments
- Collapse structures created by burning coal seams can extend vertically over 100 m, acting as chimneys for hot gases.
- Field work (2018‑2023) in the Ena, Bastacolla and Tisera collieries documented cavities up to 10 m wide and identified melted rock forms.
- Researchers discovered paralava and a glass‑enveloped rock dubbed “birianiite”.
- Computer simulations suggest isolated collapse structures could reach temperatures close to 4,000 °C, far above typical underground fire estimates.
- Using modeled coal consumption, the study estimates a global warming potential of up to 748.72 MT CO₂‑equivalent per year for Jharia – nearly double India’s total territorial emissions in 2023.
Important Facts
When mining exposes coal to oxygen, natural oxidation can trigger an underground coal fire. These fires spread irregularly, making direct measurement difficult. The study combined field observations with numerical modelling to overcome this limitation.
The authors note that their temperature and emission estimates exclude certain real‑world processes such as chemical reactions and mechanical deformation, which could modify the results. Mor