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: Event Mineral Rock, the detonation of a 100-ton spherically shaped charge of TNT on granite, was the last event of the Mine Shaft Series, a program of high-explosive tests primarily concerned with ground shock and cratering effects from explosions at or near the surface of a competent rock medium. The series, conducted in 1968 and 1969, was intended as a follow-on to previously conducted similar experiments in soil. Mineral rock (1969) duplicated the geometry and yield of Event Mine Ore (1968). Studies of crater ejecta were conducted to determine debris density and distribution, to examine the role of the ejection mechanism in crater formation, and to obtain additional information on the hazards associated with natural missiles. Mineral Rock, with a maximum observed ejecta range of approximately 2,800 feet for a 1-pound particle, produced a larger crater and a more extensive ejecta field than its predecessor, Mine Ore.

Operation Mine Shaft: Distribution of Natural and Artificial Ejecta Resulting from Detonation of 100-Ton TNT Charge on Granite: Mineral Rock Event