NOTICE This report onrisiH lafcrmtthn of t preliminary mam and wu prepared primarily for internal tue at the origiaauaf iMOUUtion. It Is eabjoct*> retlsio* or correction ud ikerefbre don not reprseeeti Hid report. It la puMd to th* recipient In oonfldeece ud ehoeld not be abstracted or further meetoeed Mount the snproral of the ortslmtler, lMttU.Uo. or DTI Extension, Oak Rldi». Thl» report wit prepared u an account of wock sponsored by the United SI.IM Government. Neither th* United Slatn nor

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... a United Stetea Atomic Energy Commiaaion, nor any of their employees, nor any of their contractors, subcontractors, or their employee*, makes any warranty, exprees or implied, or smimes any legal natality or reepoeaibUty for the accuracy, com pleteness or uaefulneai of any information, apparatus, prodnct or process disclosed, « represents that Ha uee would not infringe printely owned rights. ABSTRACT It is practical to use contained nuclear explosions to construct underground openings (nuclear chimneys) under a variety of geologic conditions. The underground environment of these chimneys provides opportunities for the development of industrial processes that may not be practical at the earth's surface. Examples to be discussed here are: the in situ, high-pressure, high-temperature recovery of metals from sulfide ores, and the in situ incorporation of nuclear-fuel reprocessing waste in molten silicate rock. *&<' tZ-i •J J."-, s^-i 3 •t '* . • v^