Longwall mining of thick underground mineral seams

Details Longwall mining of thick underground mineral seams Longwall mining of thick underground mineral seams

1976-03-08

1977-06-21

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Stabilizing underground structure

299 19, E21C 4104

Patent

active

040307522

ABSTRACT:
In the mining of a thick underground mineral seam, parallel submain entries are developed at the top of the seam or at an upper level where a competent roof exists. Spaced apart parallel sets of panel entries are driven at right angles to these submain entries along a downwardly sloping path to the bottom of the seam. The entries are continued coincident with the bottom of the seam to any desired point at which their extremities are connected with bleeder entries so as to define a series of longwall panels. These panels are mined in retreat under the protection of advancing roof support structures so as to induce caving of overlying strata. After mining a series of panels in sequence in this manner, auxiliary sets of parallel development entries are driven in a downwardly sloping path beneath and substantially coextensive with the submains to enable recovery of a substantial percentage of the mineral beneath said submains by again longwalling in retreat at right angles to the first mining direction with sublevel caving.

REFERENCES:
patent: 3778108 (1973-12-01), Pennington et al.

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