Longwall mining of trona with prefracturing to prevent slabbing

Details Longwall mining of trona with prefracturing to prevent slabbing Longwall mining of trona with prefracturing to prevent slabbing

1975-04-28

1977-04-12

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Stabilizing underground structure

299 16, 166308, E21C 2710, E21C 3712

Patent

active

040171213

ABSTRACT:
In dry mining of trona by usual methods such as the room-and-pillar and the long wall mining methods, dust formation, energy requirements, and mining machine wear are reduced and mining tool life is increased by prefracturing the trona in situ prior to mining by (a) driving holes into the trona bed to be mined; (b) introducing fracturing agent into the holes, and (c) causing the fracturing agent to fracture the trona in situ without substantial displacement of the trona so that the prefractured trona will continue to support the overburden.

REFERENCES:
patent: 3384416 (1968-05-01), Ruehl et al.
patent: 3402968 (1968-09-01), Fischer
patent: 3650564 (1972-03-01), Williamson
patent: 3778108 (1973-12-01), Pennington et al.

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