Study on the Ground Movement in an Open-Pit Mine in the Case of Combined Surface and Underground Mining

Figure 16

Progressive development of strata movement with advance of Face B₄. Face advance distance: (a) 70 m, (b) 140 m, (c) 220 m, (d) 310 m, (e) 370 m, (f) 470 m, and (g) 500 m.

(a)

(b)

(c)

(d)

(e)

(f)

(g)