E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/23
E21B 43/263 (2006.01)
Patent
CA 1144473
ABSTRACT Producing a fracture network in deep rock, e.g., in an ore body, by detonating explosive charges sequentially in separate cavities therein, the detonations producing a cluster of overlapping fracture zones and each detonation occurring after liquid has entered the fracture zones pro- duced by previous adjacent detonations. High permeability is maintained in an explosively fractured segment of rock by flushing the fractured rock with liquid, i.e., by sweep- ing liquid through the fracture zones with high-pressure gas, between sequential detonations therein so as to entrain and remove fines therefrom. Ore bodies prepared by the blast/flush process with the blasting carried out in sub- stantially vertical, optionally chambered, drilled shot holes can be leached in situ via a number of holes previously used as injection holes in the flushing procedure and a number of holes which are preserved upper portions of the shot holes used in the detonation process. In the leaching of ore, fines are removed from fractures therein by inter- mittent or continuous flushing of the ore with lixiviant and high-pressure gas, e.g., air, using in the case of the in situ leaching of an explosively fractured ore body, a lateral and upward flow of lixiviant from zones that have been less severely, to others that have been most severely, worked by multiple detonations in the ore body. - 1 -
397641
Eti Canada Inc.
Eti Explosives Technologies International Ltd.
Mccallum Brooks & Co.
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