Earth excavation using blast casting and excavating apparatus

Details Earth excavation using blast casting and excavating apparatus Earth excavation using blast casting and excavating apparatus

1991-11-25

1993-03-16

Nelson, Peter A.

Ammunition and explosives

Blasting

Terrain clearance

299 13, F42D 300, E21C 4128

Patent

active

051946890

ABSTRACT:
Coal and other mineral seams are uncovered to a desired width or "cut" by blast casting a portion of the overburden material above the seam into an adjacent pit portion followed by moving a dragline or other excavating apparatus onto a bench surface below the bench height of the unblasted overburden and building an extended bench portion with overburden material from above the seam to be uncovered. The excavating apparatus then moves onto the extended bench and removes overburden material from directly above the seam to a final spoil pile. The excavating apparatus may be returned to the start of the next cut by a return road, by building a return road along the spoil pile or by reversing its direction over the extended bench to uncover the seam.

REFERENCES:
patent: 3775984 (1973-12-01), Livingston
patent: 3792906 (1974-02-01), Kuck
patent: 4223734 (1980-09-01), Lekas
patent: 4244624 (1981-01-01), Nitzberg
patent: 4262965 (1981-04-01), Ricketts

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