OTD in 1967, the AEC, Dept. of the Interior, and the El Paso Gas Company conducted Project Gasbuggy, a Project Plowshare nuclear test to stimulate natural gas production ~55 mi. E of Farmington and ~12 mi. SW of Dulce, New Mexico, adjacent to the Jicarilla Apache Reservation. 
Yes, someone (actually, many someones) thought nuclear fracking was a really good idea. So, as part of nuclear test series Operation Crosstie, a 29-kiloton device developed by Lawrence Livermore Radiation Laboratory was emplaced at the bottom of a 4,240-foot shaft and detonated.
After the explosion, natural gas production increased relative to nearby conventional gas wells but—surprise!—it was too radioactive to be sold on the commercial market. It also had a significantly lower heat value. Production tests and evaluation activities continued until 1976.
Undeterred (!), the United States conducted two more tests as part of Project Plowshare: Project Rulison (40 kilotons, September 10, 1969) near Parachute, Colorado, and Project Rio Blanco (three 33-kiloton devices, May 17, 1973), near Rifle, Colorado. The results were the same.
