Under a circular quarry we will understand a quarry, the contour of which by the end of mining is close to an elliptical cone. The research will be carried out in the natural Cartesian coordinate system, i.e. the plane хоу is parallel to the plane of the horizon, axes ох and оу are parallel to the axes of the quarry. ...

At many operating quarries non-metallic minerals are extracted only up to the level of groundwater, and large reserves of raw materials lying below the water-bearing horizon are considered off-balance sheet and are not developed. The depth of deposit development can be increased at the expense of watered reserves by using draglines, which provide excavation of blasted rock mass from under water from a great depth.