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Reliable mine gas prediction is not only essential for effective gas drainage and control，
improvement of mining safety and reduction of coal production costs，but also important to mine gas production assessment for gas utilisation evaluation and planning.An integrated mine gas
simulation system has been developed to predict strata conditions and methane gas emission
during longwall mining.The system is used to assist selection and planning of suitable mining，gas management and utilisation strategies for new and existing mines.Several key mine gas
assessment processes，such as mine site gas and geotechnical characterisation,and fully coupled
mechanical deformation-fluid flow computer simulation，have been integrated in the simulation
system.
Gas flow during mining is controlled by in situ gas content and geotechnical conditions，as
well as the mining induced changes in the strata such as those of stress，fracture，pore
pressure and permeability.The central part of the integrated simulation system is the new 3D
code called COSFLOW that simulates the complex behaviour of rock，water and gas flow，and
predicts gas emission during longwall development and retreat.The code is also capable of
simulating gas drainage performance and estimating gas production.
This system was developed from a recently completed collaborative project entitled
“Predevelopment Studies for Mine Methane Management and Utilisation”，between the New Energy
and Industrial Technology Development Organization (NEDO) of Japan，the Japan Coal Energy Center (JCOAL)，and the Commonwealth Scientific and Industrial Research Organisation (CSIRO) of
Australia.
The integrated simulation approach is described in this paper and examples of mine site
application are presented.