Two-step segmented medium-length hole extrusion ore-breaking stage artificial trench ore-removing mining method

The invention discloses a two-step segmented medium-length hole extrusion ore-breaking stage artificial trench ore-removing mining method. The method comprises the following steps of: dividing ore blocks along the ore body direction, dividing the ore blocks into segments, and tunneling various mining roadways; performing full-thickness bottoming along an ore body, finally forming a triangular goafwith a lower disc and a higher upper disc, filling the goaf with a high-strength cementing material to form an artificial trench bottom structure, wherein the high-strength cementing material is usedas a bottom column of the stage and a top column of the lower stage at the same time; performing primary extrusion blasting on a column ore body, and cementing and filling the column goaf to form artificial columns; and after the filling work of the adjacent columns on the two sides is finished, performing primary extrusion blasting on a chamber ore body, and filling the chamber goaf with a low-strength cementing filling