The paper presents the studies carried out for integration of 02 underground mines, viz. Parasea and Belbaid Collieries as an amalgamated project rechristened as Parasea-Belbaid Project. Both the coal mines together were producing 550 TPD (tonnes per day) of coal and the PRC (Peak Rated Capacity) of the integrated project is 6000 TPD. The ventilation system of the mine has been designed by following a 02-stage process, viz. field studies in underground and ventilation network modelling studies. The Parasea Colliery has serious fire problem in many panels close to main intake and return airways of the mine and similarly in Belbaid, there are only 02 routes existing between intake and return of the mine in most of the depillared panels. Keeping these problems in view, new infrastructures such as 02 inclines and 01 ventilation shaft have been planned in the virgin side of the property. These new infrastructures have been integrated with old workings and earlier openings in such a way that these co-exist with each other and fire in the old workings do not disturb the presently developed workings and production area of the mine. The authors also present the details of implementation of recommendations for development of this amalgamated project.