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"Coal India Ltd (CIL) has graded all mines in high, moderate and low-risk categories. Mine-wise action plan to mitigate high and moderate risks and bring such mines into low risk category has been done by CIL," Coal Minister Piyush Goyal said in a written reply to the Rajya Sabha.
In December last year, CIL arm Eastern Coalfields saw Lalmatia mine collapse that claimed 18 lives.
The incident took place on December 29 when a massive mound of earth came crashing down on excavators at the Lalmatia open cast coal mine, the worst such disaster in over a decade.