Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent
1975-07-18
1977-02-15
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Stabilizing underground structure
299 18, 299 19, E21C 2720, E21C 4100
Patent
active
040079651
ABSTRACT:
This invention relates to the recovery of valuable minerals from deposits thereof in the earth and is particularly directed to a method of mining which affords recovery of at least a major portion of a seam of valuable mineral lying relatively near the surface of the earth without seriously involving the destructive effects upon the environment, inherent in surface mining. In practicing the method a relatively small proportion of the overburden covering a seam of useful mineral is removed, for later replacement, and a proportion of the valuable mineral in the seam much greater than that underlying the removed overburden is recovered by operations conducted in the pit formed by removal of overburden from selected areas, the recovery of these portions of the mineral seam being conveniently accomplished by what is known as augur mining from spaced pits disposed in predetermined patterns relatively to the mineral seam.
REFERENCES:
patent: 3167354 (1965-01-01), Macaul et al.
patent: 3362752 (1968-01-01), Densmore
patent: 3834761 (1974-09-01), Ray et al.
patent: 3848927 (1974-11-01), Livingston
Purser Ernest R.
Walton W. Wyclif
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