The coal ministry has received 78 valid bids for 21 of the 38 coal mines offered in the first auction of blocks for commercial mining, a key component of the Rs. 20-lakh crore stimulus. Aditya Birla Group companies Hindalco and Essel Mining, the Adani Group, Vedanta’s BALCO, and JSW are among 46 entities who put in a total of 82 bids.