The west part of Chengchao Iron Mine is metal mine characterized by steep structure plane. In this study

the monitored data of the ground deformation and macroscopic damage features of the mining area are analyzed. The strata movement in mining area can divided into two stages. The first stage is that the failure of the roof rock masses extends to the ground surface and then cause subsidence

while the second stage is that surrounding rock mass around goaf topples to mined-out area. Through the investigation of toppling-sliding area

it is found that the horizontal displacement mainly occurs in this area

which is greater than the vertical displacement; the ground deformation firstly increases slowly

then enters a rapid deformation phase

there exists a significant turning point; the superimposition stress induced by mining subsidence and terrain characteristics increases the ground deformation in the downhill areas

especially the horizontal displacement. Meanwhile

the distribution characteristics of angle of ground movement are revealed in the mine. The angle of ground movement in the south part of mine is greater than that in the north part

and the reason is that the north part is affected by the NNW

NNE structure planes

where the toppling failure is quite serious. The research results may be applied to the similar metal mines.