New Delhi, Dec. 12 -- The world's largest miner Coal India ltd (CIL) has been caught on the wrong footing with its various subsidiaries and arms violating green norms with impunity. For instance, its arms CCL, BCCL and SECL continued to use ground water for their mining operations without obtaining no objection certificate from Central Ground Water Authority (CGWA).

The subsidiaries did not install sewage treatment plant at the residential colonies of the collieries, thereby contaminating the ground water.

The pollutants exceeded the limits prescribed by the Bureau of Indian Standards (BIS) in eight mines across three subsidiaries of CIL, according to a CAG report on 'Assessment of Environment Impact due to Mining Activities and its Mitig...