Mining or in situ disintegration of hard material – Mine layouts
Patent
1981-10-13
1984-03-06
Purser, Ernest R.
Mining or in situ disintegration of hard material
Mine layouts
E21C 4110
Patent
active
044350171
ABSTRACT:
An in situ oil shale retort is formed in a subterranean formation by excavating voids adjacent the top and bottom boundaries of the retort, leaving an intermediate zone of unfragmented formation between the voids. The lower level void is substantially larger than the upper level void. A lower portion of the intermediate zone is explosively expanded downwardly towards the lower level void for forming a first moiety of a fragmented mass of formation particles in the retort and leaving a void space over the top of the first moiety having about the same volume as the upper level void. Thereafter an upper portion of the intermediate zone is explosively expanded upwardly towards the upper level void and downwardly towards the void space for forming a second moiety of the fragmented mass in the retort. The fragmented mass has an average void fraction up to about 25% and no substantial part has a void fraction less than about 20%.
REFERENCES:
patent: 3980339 (1976-09-01), Heald et al.
patent: 4043597 (1977-08-01), French
patent: 4047760 (1977-09-01), Ridley
patent: 4146272 (1979-03-01), French
patent: 4149595 (1979-04-01), Cha
patent: 4239284 (1980-12-01), Ridley et al.
Occidental Oil Shale Inc.
Purser Ernest R.
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