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NO EXCAVATION, DRILLING, AND/OR REMOVAL OF MATERIALS TO A TRUE VERTICAL DEPTH OF 1500 FEET IS PERMITTED WITHIN A RADIUS OF 100 FEET OF THIS SURFACE LOCATION. NOR ANY SIMILAR EXCAVATION, DRILLING, AND/OR REMOVAL OF SUBSURFACE MATERIALS BETWEEN THE TRUE VERTICAL DEPTH OF 1500 FEET TO 4500 FEET IS PERMITTED WITHIN A 600 FOOT RADIUS OF T 29 N. R 4 W. NEW MEXICO PRINCIPAL MERIDIAN, RIO ARRIBA COUNTY, NEW MEXICO WITHOUT U.S. GOVERNMENT PERMISSION.
-UNITED STATES DEPARTMENT OF ENERGY, NOVEMBER 1978.
The test called for a 29 kiloton nuclear device to be placed at the bottom of a 4,240 foot deep shaft drilled in a "tight" shale formation known to contain natural gas.
To a large degree the experiment went as planned: the underground cavity produced by the explosion, 80 feet wide and 335 feet high, filled with natural gas from the fractured surrounding rock. However the gas was too radioactive to be commercially distributed by the public utilities.