Explained: What coal blocks cases are ED, CBI investigating, and .
WEBMay 17, 2022 · A list of 143 coal blocks was prepared initially and inflated to 216 later. At that time, there were no concrete guidelines for alloion of coal blocks as coal mining was largely restricted to PSUs and many geographic loions were seen as unsuitable for profitable mining. The guidelines were periodically revised through 1993, 1998 and 2003.