Definitions for "Highwall"
The unexcavated face of exposed overburden and coal in a surface mine or in a face or bank on the uphill side of a contour mine excavation.
(2)(3) (a) the unexcavated face of exposed overburden and coal or ore in an open-cast mine or (b) the face or bank on the uphill side of contour strip mine excavation.
The unexcavated face of exposed overburden and coal of a surface mine or the exposed face or bank of a hill on the uphill side of a contour mine excavation site.