Fracking facts

By Malcolm Sutton
Updated December 18 2015 - 6:44pm, first published June 12 2013 - 3:30am
WHAT LIES BENEATH: Because of its depth, shale gas requires hydraulic fracturing, or fracking, to extract.
WHAT LIES BENEATH: Because of its depth, shale gas requires hydraulic fracturing, or fracking, to extract.

SHALE gas is usually located more than 1000 metres to 3000m below the surface. It has long been known to exist, but new developments in hydraulic fracturing and horizontal drilling, since the 1990s, has made it the preferred recovery method in the United States.

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