Mining or in situ disintegration of hard material – Processes – Explosive
Patent
1996-07-11
1997-06-03
Bagnell, David J.
Mining or in situ disintegration of hard material
Processes
Explosive
102312, F42D 304
Patent
active
056346913
ABSTRACT:
The present invention relates to a method for forming a parallel bore hole and a slant bore hole (or V-shaped V bore hole) together within the same area of a working face, and then blasting the working face by using a delay electric detonator. The method of this invention includes the steps of drilling a number of V holes at a predetermined angle in a horizontal angle cut pattern or in a vertical angle cut pattern about the central zone of a working face, drilling a number of parallel cut hole within a projective area of the above mentioned slant holes; loading an electric detonator in the slant holes and an explosive material by indirect priming in the parallel cut holes up to the bottom of the slant holes; blasting the slant holes to form a slant free surface; blasting a center cut hole out of the parallel cut holes to form two free surfaces having a funnel shape; and sequentially blasting a middle cut hole and an outer cut hole out of the parallel cut holes to form a cubical space.
REFERENCES:
patent: 4175490 (1979-11-01), Britton et al.
Mining Engineering, "Open Pit and Underground Blasting Techniques", Aug. 1981, pp. 1215-1219.
Blaster's Handbook, 15th Edition, Dupont Canada Inc. 1969 pp. 245-279.
Kim Myongkyu
Yoon Yeongjae
Bagnell David J.
Sungkyong Engineering & Construction Limited
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