• Gssbuggy(('onEaucd fn m front page)!’'!'* s .',v' rock formation has produced only 75 million cubic feet in nine sears. Engineers said the latest scries of production tests indicate that the use of underground nuclear devices to stimulate natural gas production is successful.IA ix months test has begun to determine the date at which natural gas is entering the well from the surrounding formation.i”n (iasbtiggv blast was set off in December of 1967 after a number of postponements. The test well drilled into the cavitay was in January of 196S.Engineers say that radioactivity levels at the well have not presented a danger to personnel working in the area since the well was drilled into the cavity.All gas taken from the (iasbug-gv well has been burned at the site.