My hunch is that it would be hard to make an argument that mining coal for CG will generate more jobs than hydrofracking for methane.  Hydrofracking is very service-job intensive, with many companies providing services ranging from delivering water and chemicals, disposing of wastewater, setting up wellpads, and managing logistics for hundreds of drilling locations.  Also with fracking, a fracked well usually only produces gas for 1000 days before it has to be fracked again so fracking is the job creation gift that keeps on giving.  

CG by comparison will increase construction jobs temporarily to build out CG plant infrastructure, but CG plant operations are not labor intensive.  More mining should mean more miners, but for a relatively few number of mines when compared to the number of fracking locations in the US.  

Thanks for the friendly exchange of ideas and opinions, always appreciated.