Preshot Investigations for Project Pre-Schooner, Buckboard Mesa, Nevada Test Site,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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A comprehensive geologic and engineering investigation was undertaken on Buckboard Mesa at the four sites selected for Project Pre-Schooner, a series of chemical explosive experiments conducted in dry basalt. This report covers the results of the preshot geologic and engineering investigation. Subsurface conditions were determined from four vertical borings at each site One centrally located 6-inch-diameter boring to a depth of 80 feet and three satellite NX core holes of variable depths at the ends of 35-foot radials that were spaced 120 degrees apart. The sites are blanketed by a thin soil cover of rather uniform thickness, ranging from 2 to 4 feet at the four sites, overlying a basalt cap approximately 200 feet thick. The uppermost portion of this basalt cap is composed of vesicular basalt 25 to 50 feet thick which grades into underlying dense basalt 100 to 150 feet thick. The basalt is immediately underlain by 0 to 20 feet of ash or cinder beds.
- Geology, Geochemistry and Mineralogy