Hydraulic fracturing

Injection of water and other fluids through a well into geologic formations in order to increase the permeability of the rock units and thus permit natural gas or oil to be produced from them.
This category is also used for fracking and hydrofracking.
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Frac sand in the United States: a geological and industry overview

Discusses the physical properties of frac sand, its geologic origin and formation contributing processes, its use in industry, consumption history and a global outlook. US / Canadian producers are detailed and potential other sources delineated in a GIS