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When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants (either sand or aluminium oxide) hold the fractures open. Hydraulic fracturing began as an experiment in 1947, and the first commercially successful application followed in 1950.
While relatively new in the public spotlight of Colorado fracking in the state has actual been going on since the 1973 when the first large scale fracking operation began in the Wattenberg gas field in weld county, CO. 1992 there were two landmark decisions made in Colorado that were upheld by the supreme court, these were La Plata and Voss counties in Colorado.