Blast expansion tube and its method of use in mining ore

F - Mech Eng,Light,Heat,Weapons – 42 – D

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F42D 3/04 (2006.01) E21C 37/12 (2006.01)

Patent

CA 2130391

ABSTRACT OF THE DISCLOSURE In a method of mining ore by drilling boreholes in a section of ore-bearing rock, detonating charges in the boreholes, excavating the ore-bearing material, backfilling the section with debris and cement, and repeating the exercise for the next section, the drilling of more than one blast expansion pocket is avoided by installing a blast expansion tube against the exposed end face of the vein, before backfilling the cavity. For ease of installation, the column is formed by a plurality of tubular segments. Each tubular segment comprises a flat panel to face the end face of the vein and a curved panel to extend into the cavity. The segments fit together in spigot and socket fashion to give a relatively rigid tube. The rigidity may be increased by internal bracing struts. The tubular segments have pivotal couplings so that each segment after the first can be coupled to its predecessor before being lifted into the vertical position and slotted into it. Each segment has a pair of cable attachments in the form of shackles or other suitable devices enabling the column of segments to be suspended by cables during installation. With the column of segments installed, the cavity is backfilled, the charge boreholes drilled, and the next section blasted. The blast expansion tube is destroyed by the blast and removed with the debris. Each segment may comprise a closed compartment formed by means of a pair of closure plates secured across end portions of the segment.

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