Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1978-07-31
1980-03-11
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
102 23, E21C 4110
Patent
active
041925548
ABSTRACT:
Formation is excavated from within a retort site in formation containing oil shale for forming a plurality of vertically spaced apart voids extending horizontally across different levels of the retort site, leaving a separate zone of unfragmented formation between each pair of adjacent voids. Explosive is placed in each zone, and such explosive is detonated in a single round for forming an in situ retort containing a fragmented permeable mass of formation particles containing oil shale. The same amount of formation is explosively expanded upwardly and downwardly toward each void. A horizontal void excavated at a production level has a smaller horizontal cross-sectional area than a void excavated at a lower level of the retort site immediately above the production level void. Explosive in a first group of vertical blast holes is detonated for explosively expanding formation downwardly toward the lower void, and explosive in a second group of vertical blast holes is detonated in the same round for explosively expanding formation upwardly toward the lower void and downwardly toward the production level void for forming a generally T-shaped bottom of the fragmented mass.
REFERENCES:
patent: 1913395 (1933-06-01), Karrick
patent: 3661423 (1972-05-01), Garrett
patent: 4043595 (1977-08-01), French
patent: 4043596 (1977-08-01), Ridley
patent: 4043597 (1977-08-01), French
patent: 4043598 (1977-08-01), French et al.
Occidental Oil Shale Inc.
Purser Ernest R.
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