Research on Inpit Dumping Height during Tracing Mining Period between Two Adjacent Surface Coal Mines

Table 2

Relationship between the dumping height and the total cost.

Dumping height (m)	Transportation cost (million yuan)	Secondary stripping cost (million yuan)	Total cost (million yuan)
0	571.50	0	571.50
15	500.27	2.05	502.32
30	431.98	8.22	440.20
45	367.03	18.49	385.52
60	305.83	32.87	338.70
75	248.78	51.36	300.14
90	196.31	73.96	270.27
105	148.86	100.66	249.52
120	106.83	131.48	238.31
135	70.65	166.40	237.05
150	40.74	205.43	246.17
165	17.53	248.57	266.10
180	0	301.59	301.59