State-run monopoly coal producer Coal India (CIL)'s mineable reserves increased to3.2 billion tonne in 2011-12, which is a 45 percent growth from the earlier year. Data fromCentral Mine Planning & Design Institute (CMPDIL), theresearch and development wing of CIL, showed.   
 
 Currently, CIL's proven coal reserves, or the areas ready to be mined, total up to about 64 billion tonne, with CMPDIL adding on an average 2.5 billion tonne every year. 
 
 The data has come as a relief to the state-owned monopoly, which missed its revised 2011-12 production target, achieving only 435.84 million tonne against the projected 447 million tonne.
 
 CIL takes four to six months to prepare feasibility and detailed project reports on such reserves, which are then placed before the board for investment clearance.
 
 CMPDIL said it set a record in 2010-11 by carrying out 273,000 metre of drilling, which was 2 percent higher than the previous year's. Drilling by CMPDIL and its contractual agencies touched an all-time high of 498,000 metre in 2011-12, compared with 492,000 metre in the previous year.