The company's consolidated net profit was at Rs 4,037 crore in the corresponding period of the last fiscal, the company said in a filing to BSE.
The consolidated income from operations of CIL for the period stood at at Rs 17,325 crore, registering an increase of around 13 per cent over the year-ago period, it said.
CIL's net sales in the October-December period was at Rs 15,349 crore, it added.
The total expenses of the company during the period also went up to Rs 13,457 crore on account of higher expenses on employee benefits and others expenditure, it said.
The total production of the company during the quarter stood at 117 million tonnes (MT), registering an increase of 2 per cent over the year-ago period.
The coal PSU produced 114.6 MT in October-November period of last fiscal.
CIL's coal offtake during the period also went up to 120 MT, as against 110 MT in the corresponding quarter of the previous year.
The standalone net profit of the company for the quarter ended December 31, 2012 was at Rs 1,696.9 crore, registering a growth of 39 percent.
The PSU's standalone net profit stood at Rs 1,219 crore in the December quarter of FY'12, the company said.
The standalone net sales of CIL in the November-December quarter went up to Rs 90 crore, over Rs 71 crore in the same period of last financial year.
The shares of CIL closed today at Rs 347.80 a piece on the BSE, up 0.80 per cent from the previous close.