Abstract
ABSTRACT Fourteen transverse, nearly vertical, successive faces were excavated, surveyed, sampled, and photographed to document the characteristics of the test burn cavity produced by the 1983 CRIP experiment. The cavity area exhibited a basically flat-bottomed and vertical-walled geometry. The reaction zone along the bottom and side walls was less than six inches in thickness. The vertical sequence of the cavity consisted of a 3- to 4-foot thick yellow-colored slag pile followed by up to 30 feet of high-temperature affected collapsed overburden. Samples taken were analyzed by proximate, elemental, and X-ray diffraction techniques. Results indicated a steep temperature gradient across the reaction wall and temperatures in excess of 1200°C in altered overburden material. The sequence of mineralogic changes with increasing temperature was qualitatively identified. A leaching study also was conducted on the samples to identify major leachate constituents and their relationships to the various altered rock types.
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