[Retracted] Optimisation of Working Line Length during the Period of Gently Inclined Slope in Tilted Coal Seam Open-Pit Mine

Table 3

Table of main parameters.

Projects	Unit	Numerical values
Coal seam thickness m	M	64.93
Coal seam inclination α	°	13
Inner drainage field slope angle β	°	20
End gang edge slope angle β1、β2、β3、β4、β1’、β3’、β4’	°	35
End gang edge slope angle β2’	°	20
Inside row tracking distance b	M	80.00
Width of first mining area L0	M	1200.00
Width of secondary mining area L	M	1300.00
Thickness of overburden in the north gang of the first mining area hf	M	230.00
Annual advancement	M	300.00
Years of service in mining areas p	A	20
Raw coal capacity γ	t/m^3	1.29
Raw coal recovery rate η	%	97