Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1976-02-20
1977-08-23
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166259, 299 13, E21B 4326, E21C 4110
Patent
active
040435989
ABSTRACT:
A subterranean deposit containing oil shale is prepared for in situ retorting by initially excavating a plurality of vertically spaced apart voids of similar horizontal cross section located one above another within the deposit. A plurality of vertically spaced apart zones of unfragmented deposit are temporarily left between the voids, each unfragmented zone having a thickness of less than about 190 percent of the smallest lateral dimension of the voids above and below it. Explosive placed in each of the unfragmented zones is detonated, preferably in a single round to expand each unfragmented zone into the voids on either side of it and form a subterranean room containing a fragmented mass of particles having a void volume equal to the void violume of the initial voids. Retorting of the expanded mass is then carried out to recover shale oil from the oil shale.
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Jackson et al. "Stoping Methods and Costs," U.S. Dept. of the Interior, Bureau of Mines Bulletin No. 390, 1936, pp. 2-19.
E. I. Du Pont de Nemours & Company, Blasters Handbook, 1969, pp. 240-244, 343-345.
Cummins et al., SME Mining Engineering Handbook, Society of Mining Engineers, 1972, pp. 12-15, 12-135 through 12-150, and 12-162 through 12-233.
French Gordon B.
Garrett Donald E.
Novosad Stephen J.
Occidental Oil Shale Inc.
Suchfield George A.
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