Method of underground mining

Details Method of underground mining Method of underground mining

1977-06-20

1979-01-23

Pendegrass, Verlin R.

Ammunition and explosives

Igniting devices and systems

299 13, F42B 300

Patent

active

041354508

ABSTRACT:
A novel method of excavating underground chambers in strong rock is provided which is particularly suitable for use in stope and pillar mining operations. The method takes advantage of blasting techniques and specifically the use of large diameter spherical explosive charges by locating a spherical charge in a cavity provided in the ceiling or roof of an underground chamber. Upon detonation of the charge, an optimum volume of cavity is produced in the chamber ceiling from which well fragmented ore rock is displayed by gravity to the floor of the chamber from where it is easily removed.

REFERENCES:
patent: 2312752 (1943-03-01), Cook
patent: 2387701 (1945-10-01), Dove, Jr.
patent: 3537753 (1970-11-01), Arendt
patent: 3735704 (1973-05-01), Livingston
patent: 3760728 (1973-09-01), McKee

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