So they just happen to frack in old coal mining areas ..... I see slight earth tremors on a small scale happened a while back with fracking - we sit on Black gold since the pits closed the technology has moved on - ever seen the documentary of Britain's The last pit in Yorkshire - pitiful the miners ploughed all their redundancy money in to it using modern technology - railway right to Battersea power station it was making loads of money - shut down and Colombian Coal ferried in very ecological it's going to close now - perpetrators of that Cameron and Osborne...... but in from Columbia and shut a pit rich in Black Gold down - the coal was extracted by a big machine cutter which filled the coal direct onto the conveyor belt only 10 men per shift - very few managers - making money so shut it down Britain's last pit ,and import from Columbia.....It`s not coal Joey, it`s shale.
The gas is trapped between the layers of shale, forming pockets of gas.
Hence, due to the instability of the shale it`s such a dirty / dangerous process to get the gas out safely.
They`re two different things.
Sorry for being pedantic, but you really should know how to use google by now.
the yorkshire coal looked superb not for sale to the public in the contract the government broke........
watch the documentary -
The Last Miners: BBC documentary follows workers as they bid final farewell to the last pit standing
BBC documentary given exclusive access as 450 miners embark on a five-week countdown to their last ever shift at Kellingley Colliery, North Yorkshire, marking the end of British deep coal mining.
www.bbc.co.uk