Research on Stability of an Open-Pit Mine Dump with Fiber Optic Monitoring

Table 4

Content of each grade of dispersion in the dump (Fengjiadonggou).

Particle group collectively	Particle group classification		Particle size range (d/mm)	Content (%)
Giant particle group	Boulder (rock)		d > 200	5.50
	Pebble (gravel)		200 > d > 60	17.72
Coarse grain group	Gravel (breccia)	Coarse gravel	60 > d > 20	27.15
		Medium gravel	20 > d > 5	27.55
		Fine gravel	5 > d > 2	10.91
Fine grain group	Grit, powder		2 > d > 0.005	10.38
	Clay particle		0.005 > d	0.80