Table 3.

The experimental results of the hydro-mining effectiveness in terms of the depth (in cm) of the mined coal face spot.

Nozzle outlet diameter (mm)	Operating time (s)	Distance from the sidewall (m)
		0.00 (m)	0.05 (m)	0.10 (m)
2.5	60	14	9	8
	120	18	11	10
	180	19	12	10
2.1	60	12	10	8
	120	16	11	10
	180	16	12	10