Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1983-09-16
1986-09-16
Leppink, James A.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 13, E21C 4110
Patent
active
046118560
ABSTRACT:
A subterranean formation containing oil shale is prepared for in situ retorting by forming a fragmented permeable mass of formation particles containing oil shale in an in situ retort site. The retort is formed by excavating a lower level drift adjacent a lower portion of the retort site and excavating an upper level void adjacent an upper portion of the retort site. An undercut is excavated below a zone of unfragmented formation remaining within the retort site above the lower level drift. The undercut can be free of roof-supporting pillars. Explosive is loaded in the zone of formation from access provided by the upper void, and the zone of formation is blasted downwardly toward the undercut for forming the fragmented mass. The volume of the void space within the undercut prior to explosive expansion is similar to the void volume within the principal portion of the fragmented mass being formed. The zone of formation is blasted downwardly in lifts, with each lift being blasted toward a void space larger than a limited void, except for the last lift, which can be blasted toward a limited void. Blasting designs are also disclosed for providing reasonably uniform void fraction distribution in the fragmented mass.
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"The Application of Spherical Charge Technology in Stope and Pillar Mining" by L. C. Lang-Eng. & Mining Journal, 5-1976.
Cha Chang Y.
Ricketts Thomas E.
Dang Hoang C.
Leppink James A.
Occidental Oil Shale Inc.
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