An Innovative Directional Blasting Technique for Coal Mine Exploration and Engineering Testing

Table 3

Results of drilling inspection.

Hole number	Transverse fissure	Longitudinal fissure	Connectivity rate
#4 observation hole	0.07 m (1 cm)	0.1~0.5 m	8%
	0.072 m (2 cm)	0.72~0.8 m
	4.03 m (2 cm)
#5 observation hole	0.42 m (1 cm)		2%